JP5250758B2 - Miscellaneous wastewater treatment equipment, miscellaneous wastewater treatment system and miscellaneous wastewater treatment method using a cavitation effect. - Google Patents

Description

  The present invention relates to a miscellaneous wastewater treatment apparatus, a miscellaneous wastewater treatment system, and a miscellaneous wastewater treatment method that are useful for purifying miscellaneous wastewater containing organic substances such as oil components.

Miscellaneous wastewater, including various product production factories, restaurants, public facilities and homes,
Although it is generally known that it originates from various places, the components contained in miscellaneous wastewater vary widely depending on the origin, and in order to make polluted wastewater pollution-free at each origin Various methods have been studied and adopted.
Of various miscellaneous wastewater, food processing miscellaneous wastewater generated daily from various restaurants contains many kinds of organic substances such as fat component, protein component and / or carbohydrate component, so it is specially treated for its decomposition. In particular, it was difficult to decompose the oil component.
One of the reasons is that the oil component has a property that when the mixture of oil and water is left unattended, the oil is separated in an instant and the oil floats on the water surface and diffuses into the entire water surface as a thin film. It is difficult to collect and disassemble without leaking.

In restaurants and food factories, as one type of miscellaneous wastewater treatment, a method is often employed in which miscellaneous wastewater is stored in a storage tank and the contained organic matter is decomposed over time to make it pollution-free.
The size of the storage tank used in the restaurant depends on its size, but in the case of a small scale, for example, about 150 to 350 liters are often used and installed under the floor inside the store or outside the store. On the other hand, in large-scale food processing factories, a storage tank of about 4 to 6 cubic meters is used for miscellaneous wastewater treatment.
The miscellaneous wastewater treatment by the storage tank is roughly classified into a back-up system using oxygen or ozone, a system using microorganisms, and a system using the storage tank simply as an oil-water separation tank.

The backing method is a method in which oxygen or ozone is blown into miscellaneous wastewater to oxidize and decompose organic matter.
As a storage tank used for the buckle system, one separated into a first tank and a second tank by one partition plate, one separated into a first tank or a second tank and a third tank by two partition plates, etc. Various storage tanks are used and are usually cubic.

The storage tank provided with the partition plate will be described.
In the storage tank separated by the two partition plates, the first partition plate provided between the first tank and the second tank is fixed so as to form an empty space without contacting the bottom of the storage tank, and the upper part Is opened so that the liquid in the second tank flows into the third tank, and an empty portion is provided.
When untreated miscellaneous wastewater is flowed into the first tank, the oil component floats on the surface, while the solid content moves along with moisture from the first tank to the second tank through the space between the bottom of the first partition plate. Next, the upper layer miscellaneous wastewater in the second tank is transferred to the third tank from the upper empty portion of the second partition plate, and finally the treated miscellaneous wastewater is discharged from the third tank to the outside.
During this time, the oil component floating on the surface of the first tank is collected and collected, and oxygen or ozone is blown out into the waste water of the third tank or the second tank and the third tank to oxidize and decompose the organic matter.
The function of the first tank and the partition plate in the storage tank separated by one partition plate is the same as that of the storage tank separated by the two partition plates, and oxygen or ozone is blown out into the miscellaneous drainage of the second tank. The organic matter is oxidatively decomposed.

In the microbial method, organic matter contained in miscellaneous wastewater is decomposed by microorganisms and then discharged.
In the case of the microbial treatment method, since a certain treatment time is required for the decomposition action by the microorganism, there is a drawback that it is impossible to cope with a large amount of wastewater discharged.

For example, Chinese restaurants often wash their wok or tableware with a large amount of water, and many restaurants have time and quantity of miscellaneous wastewater so that the number of customers can change greatly depending on the time of day. In general, it is very irregular, and since it is a normal state that it is continuously discharged in a large amount for a long time and flows into the storage tank, the state where decomposition cannot catch up with either the buck method or the microbial method occurs.
That is, in general, the amount of inflow flowing into the storage tank is very irregular in time, and the amount of inflow is not constant, and when the inflow starts, it may continue to flow in a large amount continuously for a long time.
For this reason, it is conceivable to increase the amount of gas blown out by the back-up method, but bubbles blow up from the surface of the storage tank. Further, when ozone is used, there are other problems such as toxicity to the environment. Will occur.
On the other hand, in the microbial system, the microorganism itself often flows out, and there is a problem that it is necessary to observe the degradation state by the microorganism from time to time, which is troublesome. In other words, since a certain treatment time is required even in the microbial method, if a large amount of wastewater flows within a single hour, this may not be dealt with.

In this way, there is a limit to fully decomposing organic matter with either method, and when a large amount of wastewater containing oil and fat is discharged at once, it cannot be separated and both oil and water flow out to the outside. Often seen.
Furthermore, because the organic matter is not sufficiently decomposed, the treated wastewater contains a lot of untreated organic matter, and it takes a long time to discharge a large amount of treated wastewater as it is. The actual situation is that the oil components collected in the sewage ditches or public sewers are requested to be disposed of by a recovery company.
In addition, in the bucky system, it is necessary that the oxygen or ozone to be blown in contact with solutes such as organic matter in miscellaneous wastewater as much as possible to improve the decomposition efficiency, and that these blown gases must not blow up, For this reason, it is required that the bubble size be as small as possible on the order of microns, but no solution has yet been found.
In addition, since the bucky system often requires repeated aeration and sedimentation, it is necessary to install several treatment tanks in succession. In a small wastewater treatment facility, substantially, Economical installation is impossible.

On the other hand, the method of simply using the storage tank as an oil / water separation tank uses a storage tank with a water outlet on the side or bottom, and the wastewater in the storage tank is separated into oil water to some extent over time. The actual condition is that the oil component is drawn up and requested to the disposal company for disposal, and the water is discharged from the discharge port, and usually flows into the river etc. as described above.
Even in this method, if a large amount of miscellaneous wastewater is discharged, it cannot be separated in the oil / water separation tank, and there is a problem that both oil and water must flow outside.

  In many large-scale food processing factories, large-capacity storage tanks that do not have partition plates of about 4 to 6 cubic meters are used, and organic substances are decomposed by oxygen or the like by a normal back-up method, and are generated by decomposition. A method is adopted in which the sediment is discharged from the outlet provided in the storage tank and processed, but if the decomposition is not sufficient, the supernatant is transferred to another large-volume storage tank, It is necessary to repeat the decomposition process.

On the other hand, in recent years, various proposals using the cavitation effect have been made, and one of them is a technique using the cavitation effect for the treatment of factory waste water (see, for example, Patent Document 1).
The proposal described in Patent Document 1 removes and treats TOC components such as isopropyl alcohol, dimethyl sulfoxide, tetramethylammonium hydroxide, and surfactants from the washing wastewater discharged in the semiconductor manufacturing process, and cleans them after the treatment. It aims to be reused as water.
Specifically, a certain amount of washing wastewater stored in the storage tank is sent to the liquid feeding means, and after being pressurized by the liquid feeding means, the pressurized treatment liquid is sprayed by the cavitation generating means, and the cavitation generating means The main point is to decompose the components contained in the cleaning wastewater by promoting the generation of OH radicals in the liquid to be treated by the radical generation promoting means at any time before or after the injection step. is there.

The proposed waste water treatment apparatus has radical generation promoting means as an essential component in addition to the liquid feeding means and the cavitation generating means, and it is impossible to remove the TOC component only by the cavitation generating means. Is a technique for treating the water as efficiently as possible so that it can be reused as washing water.
This proposal is a method of treating a certain amount of cleaning wastewater once stored in a storage tank, and once it has been processed and discharged, it is said that once it has been discharged, it will treat the cleaning wastewater newly stored in the storage tank. Therefore, it is impossible to apply the method as it is to the treatment of miscellaneous wastewater that is continuously and temporally and quantitatively discharged as in the above restaurant.

In addition, there is a technique that uses a cavitation effect for sewage purification, that is, sewage treatment (see, for example, Patent Document 2).
The proposal described in Patent Document 2 is a method of injecting a gaseous oxidant such as oxygen or ozone into sewage collected in a septic tank, passing the sewage through a cavitation generator, and then connecting a reflux passage to the outlet of the cavitation generator. This is a method of directly oxidizing and purifying organic matter in the sewage, which is performed while the sewage is stirred by a stirrer installed in the septic tank during this period.
This method purifies sewage from the sewerage system in the national or local governments, and the amount of sewage treated with a large septic tank is probably large, so the energy generated by the cavitation generator is sufficient. It is considered that a purification effect cannot be obtained and a step of injecting a gaseous oxidant and a step of stirring sewage in the septic tank are required, and it is bothered to return directly from the cavitation generator to the septic tank. The reason for performing this through the passage is that a special cavitation generator is required to control the sewage that passes through the pump. It is guessed that a special pump must be used because it is fragile when entering.
Accordingly, the proposal described in Patent Document 2 cannot be applied as it is under special circumstances such as in the above-mentioned restaurant, including the scale and cost.
As described above, various proposals using the cavitation effect have been made in the past, but there is still no report that miscellaneous wastewater discharged from a restaurant or a food factory has been treated by cavitation.

JP 2002-130185 A JP 2004-141731 A

An object of the present invention is to provide a miscellaneous wastewater treatment apparatus, a treatment system, and a treatment method using this system that can treat miscellaneous wastewater containing various kinds of organic substances by changing the wastewater into pollution-free wastewater that can be discharged into a river. It is to be.
Another object of the present invention is to provide a miscellaneous wastewater treatment apparatus, a treatment system, and a treatment method using this system, which can efficiently treat the wastewater containing various kinds of organic substances, particularly without leaking oil components. It is.
Furthermore, an object of the present invention is to provide a miscellaneous wastewater treatment apparatus, a treatment system, and this system capable of efficiently and continuously treating a large amount of miscellaneous wastewater that is continuously and temporally and quantitatively discharged irregularly. It is providing the processing method using.

  The present inventors focused on the cavitation effect in order to solve the above-mentioned problems. Concerning miscellaneous wastewater containing many kinds of organic substances including oil components that are difficult to handle, it is not just a certain amount of miscellaneous wastewater but continued irregularly. In order to find out the conditions for effectively and efficiently decomposing miscellaneous wastewater flowing into the storage tank effectively by the cavitation effect and continuously treating it, the inventors have created the following inventions.

(1) A miscellaneous wastewater treatment device for purifying miscellaneous wastewater from food processing containing oil components, a pump for sucking and pressurizing miscellaneous wastewater in a storage tank, and a suction port by the suction force of the pump Provided with at least a miscellaneous water suction tank for sucking miscellaneous wastewater into oil droplets and a nozzle for directly injecting the miscellaneous wastewater pressurized by the pump into the storage tank A miscellaneous wastewater treatment apparatus characterized in that a circulation path for miscellaneous wastewater that sequentially flows through the tank, the pump, the nozzle, and the storage tank is formed therein.

  (2) The miscellaneous wastewater treatment apparatus according to (1), wherein the pumping capacity per minute of the pump is 0.5 to 5 times the predetermined full capacity of the storage tank.

  (3) The miscellaneous wastewater treatment apparatus according to (1) or (2), wherein the head of the pump is 5 to 30 m.

  (4) The miscellaneous wastewater treatment apparatus according to any one of (1) to (3), wherein the nozzle is a venturi type or an orifice type.

  (5) The nozzle is a venturi type, and is a double-pipe structure comprising a venturi tube and an air supply tube that coaxially incorporates the venturi tube, and a through hole is provided in the wall of the air supply tube The miscellaneous wastewater treatment apparatus as described in (4) above.

  (6) The through hole is joined to a pipe or tube, and an intake air amount adjusting means for adjusting the amount of gas and liquid sucked from the through hole is provided at the other end of the pipe. The miscellaneous wastewater treatment apparatus as described in (5) above.

  (7) The miscellaneous wastewater treatment apparatus according to any one of (4) to (6), wherein a diameter of the miscellaneous drainage injection port of the venturi pipe is 4 to 14 mm.

  (8) Before supplying miscellaneous wastewater pressurized by the pump to the nozzle, it is provided with a tank for temporarily storing it (referred to as a pressure tank), and the nozzle is fixed to the pressure tank. The miscellaneous wastewater treatment apparatus according to any one of (1) to (7), characterized in that it is characterized.

  (9) The miscellaneous wastewater treatment apparatus according to any one of (1) to (8), further comprising a solid material removal dredge installed immediately below the inflow port of the storage tank.

  (10) An oil / water separation plate for partitioning into an untreated wastewater inflow side and a wastewater treatment side installed in the storage tank is provided, and the oil / water separation plate sends miscellaneous wastewater from the inflow side to the treatment side. The miscellaneous wastewater treatment apparatus according to any one of (1) to (9), wherein the miscellaneous wastewater treatment apparatus has a hole for flowing.

  (11) The miscellaneous wastewater treatment apparatus according to (10), wherein a hole provided in the oil / water separation plate is provided at a position that guides an oil component floating on a water surface.

  (12) The miscellaneous wastewater treatment apparatus according to (10) or (11), further comprising an oil component guide groove fixed in accordance with a hole provided in the oil / water separation plate.

  (13) The miscellaneous wastewater according to any one of (10) to (12), wherein the oil component guide groove is connected to a pump, and has an inlet for flowing miscellaneous wastewater on the miscellaneous wastewater treatment side. Processing equipment.

  (14) The miscellaneous drainage suction tank fixedly installed at the bottom of the storage tank is provided, and the miscellaneous drainage suction tank is connected to the oil component guide groove and the pipe A according to (13), Miscellaneous wastewater treatment equipment.

  (15) The submersible pump connected to and fixed to the miscellaneous waste water suction tank is provided, and the submersible pump is connected to the nozzle and the pipe B through the pressure tank or directly. Miscellaneous wastewater treatment equipment.

  (16) The miscellaneous drainage suction tank is connected to a pump installed outside the storage tank by a pipe C, and the pump is connected to the nozzle and the pipe D through a pressure tank or directly ( The miscellaneous waste water treatment apparatus as described in 14).

  (17) The pump is installed outside the storage tank, and the tip of the pipe E connected to the pump functions as a suction port for directly sucking miscellaneous wastewater, and the pump is connected to the pipe D via the pressure tank or The miscellaneous wastewater treatment apparatus according to any one of (1) to (12), which is directly connected to a nozzle.

  (18) The pump is installed outside the storage tank, the tip of the pipe E connected to the pump is connected to the oil component guiding groove, and the pump is connected to the nozzle via the pressure tank or directly by the pipe D. The miscellaneous wastewater treatment apparatus according to (13), wherein

  (19) An inlet for the untreated miscellaneous wastewater and an outlet for the treated miscellaneous wastewater are provided, and the untreated miscellaneous wastewater flowing from the inflow port or the untreated miscellaneous wastewater and miscellaneous wastewater ejected from the nozzle are stored. The miscellaneous wastewater treatment apparatus according to any one of (1) to (18), wherein a miscellaneous wastewater storage tank is used.

  (20) The miscellaneous drainage storage tank having a cubic shape is used, the inlet and the outlet are provided on corresponding side portions of the cubic shape, and the drainage of the miscellaneous drainage storage tank is The miscellaneous disposal apparatus according to (19) above, wherein the inflow is provided at a position where the outflow starts when a predetermined full amount is reached and the inflow port is higher than the outflow port.

(21) Any one of the above (1) to (21), wherein the nozzle is disposed such that a tip portion serving as a nozzle outlet is directed toward the miscellaneous drainage storage tank and below the miscellaneous drainage surface in the miscellaneous drainage storage tank. The miscellaneous wastewater treatment apparatus according to claim 1.

  (22) The method according to any one of (1) to (21), further comprising a radical water generating means, wherein the purification effect is enhanced by injecting radical reaction water generated by the radical water generating means. Miscellaneous wastewater treatment equipment.

  (23) A miscellaneous wastewater treatment system in which the miscellaneous wastewater treatment apparatus according to any one of (1) to (22) is attached and fixed to a miscellaneous wastewater storage tank.

(24) Using the miscellaneous wastewater treatment system according to (23), the circulation path formed by installing the miscellaneous wastewater suction port toward the water surface and below the water surface and operating the pump A miscellaneous wastewater treatment method is characterized in that miscellaneous wastewater is purified by a cavitation effect generated at that time by spraying miscellaneous wastewater in a high-speed flow that circulates water.

  (25) The miscellaneous drainage according to (24), wherein the drainage is closed and the miscellaneous drainage is circulated in accordance with the amount of untreated miscellaneous drainage in the miscellaneous drainage in the storage tank. Processing method.

  (26) The miscellaneous wastewater treatment method as described in (24) or (25) above, wherein the miscellaneous wastewater is food processing wastewater.

  (27) The wastewater treatment method according to (25), wherein the food processing wastewater contains a fat component, a protein component, and / or a carbohydrate component.

  (28) At least a pump for sucking and pressurizing miscellaneous wastewater in the storage tank, a nozzle for directly injecting miscellaneous wastewater pressurized by the pump into the storage tank, and a pipe interconnecting them An oil component induction groove characterized by having a mechanism that is used in a miscellaneous wastewater treatment apparatus and induces an oil component floating on the surface of miscellaneous wastewater in a miscellaneous wastewater storage tank to flow to the pump together with miscellaneous wastewater.

  (29) The oil component guiding groove according to (28), which is fixed to an oil / water separation plate that separates the inside of the storage tank into two.

  (30) The above (28) or (29), wherein the oil component and the miscellaneous wastewater are connected by a pipe to the miscellaneous wastewater suction tank for sucking and collecting the oil component and miscellaneous wastewater before being introduced into the pump The oil component induction groove according to 1.

According to the present invention, in particular, wastewater containing many kinds of organic substances including an oil component, and in addition, a large amount of wastewater generated in total irregularly in terms of time and quantity, Therefore, it is possible to provide a wastewater treatment apparatus, a treatment system, and a treatment method using this system that can be efficiently converted into pollution-free wastewater that can be discharged into the wastewater.
The “degree that can be released into the river” means the case where the amount of dissolved oxygen in the sewage is measured 5 days after the treatment, and the amount decreased during that period is 600 ppm / liter or less. Is referred to as a BOD value, and “600 ppm / liter or less” is a value with less microorganisms consuming oxygen, and is standardized as a regulation value.
The miscellaneous wastewater treated according to the present invention can satisfy the regulation value and is expected to be able to live for a long time.

In general, miscellaneous wastewater treatment is to activate water molecules as a solvent to separate and decompose some or all of the chemical bonds of the solute.
The miscellaneous wastewater to which the miscellaneous wastewater treatment apparatus of the present invention is applicable has been studied as being applicable to food processing wastewater, so that the solvent is water, the solute is a fat component, a protein component and / or a carbohydrate component, etc. It is particularly effective for those containing many kinds of organic substances including oil components.
Therefore, for example, for one organic hydrocarbon compound, if energy larger than the bonding force between molecules and atoms of the hydrocarbon compound is applied, separation, decomposition, substitution, ionic reaction, etc. occur, and the solvent It is considered that a new chemical reaction is promoted by free radicals or the like due to the action of polar force.
The inventors of the present invention repeatedly conducted experiments based on this idea, and considered the use of ultrasonic waves as an energy source for advancing this chemical reaction, and focused on the cavitation effect.
At first, the Langevin method, which is known as one of the cavitation generation methods, was studied, but because the amount of energy generated by vibrating the diaphragm in the wastewater is low, it does not reach the oil component layer on the surface and decomposes organic matter. Therefore, it was confirmed that it was not sufficient from the technical and economic viewpoints.

The cavitation generation method used in the miscellaneous wastewater treatment apparatus of the present invention is an injection method, and the applicable injection method is not limited. For example, a venturi method and an orifice method can be preferably used.
In general, a cavitation bubble is formed when a jet of water jet is radiated into a liquid, and the bubble diffuses, expands and collapses in the liquid. At the time of this collapse, a high pressure of about several Mpa to several Gpa is generated. It is known to generate high energy with a shock wave and a high temperature of several thousand degrees, and this high energy is said to exhibit a cavitation effect that decomposes substances contained in a liquid, for example.

The miscellaneous wastewater treatment apparatus of the present invention includes a pump for sucking and pressurizing miscellaneous wastewater in a storage tank, a nozzle for directly injecting miscellaneous wastewater pressurized by the pump into the storage tank, and these It comprises at least a pipe to be connected, and forms a circulation path for miscellaneous waste water that sequentially flows through the pump, the nozzle, and the storage tank during operation of the pump.
“Nozzle for direct injection into the storage tank” means that no passage such as a pipe is interposed between the nozzle and the storage tank.
The miscellaneous wastewater ejected from the nozzle is mixed with the miscellaneous wastewater in the full storage tank, but most of it forms convection in the storage tank by the suction force of the pump in the storage tank, and again from the intake port. The inside of the processing apparatus is refluxed.
In order to form the convection, it is more preferable that at least the tip of the nozzle is located in the miscellaneous drainage in the storage tank, and the formation of the convection also contributes to the scale of the storage tank. It is necessary to adjust and select the size of the storage tank so that the convection is formed.
That is, in the miscellaneous wastewater treatment system of the present invention, the pipe (1) that sucks miscellaneous wastewater and sends it to the pump, the pipe (2) that feeds from the pump to the nozzle, and the storage tank are used during the pump operation. A drainage channel is formed, and miscellaneous drainage flows back through this channel one or more times. Therefore, in the present invention, the channel is referred to as a circulation path, and the circulation path is immediately formed when the pump is started. Become.
The miscellaneous wastewater flows through the circulation path one or more times and is treated, and then flows out from the outlet.

  The miscellaneous wastewater treatment method according to the present invention is that the untreated miscellaneous wastewater flows irregularly and continuously while the pump is operating and the miscellaneous wastewater is being treated, and the treated miscellaneous wastewater is approximately the same amount as the untreated miscellaneous wastewater that has flowed in. And the storage tank is always in full condition with miscellaneous wastewater, and the wastewater is repeatedly recirculated through the circulation path several times to receive repeated cavitation effects due to high energy. As a result, a treated wastewater having a BOD value of 600 ppm / liter or less can be generated, and the treated wastewater can be discharged into a river.

As the pump used in the miscellaneous wastewater treatment apparatus of the present invention, the pumping capacity per minute is preferably 0.5 to 5 times the predetermined full capacity of the storage tank, particularly 1.5 to 4 times. preferable.
The inventors of the present invention have confirmed that even if a liquid feeding means having a flow capacity exceeding 5 times is used, no improvement in effect is observed. On the other hand, when it is less than 1 time, it takes too much time to treat miscellaneous wastewater, which is not practical and is not preferable.
Therefore, as the pump used in the present invention, it is preferable to select and use a pump whose predetermined flow rate per minute is 1 to 5 times the predetermined full capacity of the storage tank to be used.
Furthermore, it is preferable that the amount of miscellaneous wastewater filled in the miscellaneous wastewater storage tank can be delivered within 1 to 5 minutes.

As the pump, in order to fully exhibit the cavitation effect and decompose the organic matter, the size of the head is important and is not particularly limited, but according to the verification by the present inventors, the head is 5 to 30 m. In particular, in order to decompose the oil component, 8 to 16 m is preferable.
When the head exceeds 30 m, the cavitation effect tends to be less changed, while when a pump with a head less than 5 m is used, the amount of foam formed tends to decrease. It affects the cavitation effect.

In addition, the installation location of the pump may be inside or outside the miscellaneous wastewater storage tank, and in the case of the inside, a submersible pump is used. It is called “outside installation type”.
The submersible pump used for the "inside tank type" should be installed and protected in a cover such as a cylindrical body so that it does not directly drain, and it is attached so that it communicates with the miscellaneous waste water suction tank. It is preferable.
The miscellaneous drainage suction tank is extremely effective for allowing the pump to suck oil components that have a property of diffusing over the entire water surface and are difficult to handle without leaking.
That is, the miscellaneous waste water suction tank is connected to the pipe A, the inside of the tank is sucked with a pump and depressurized, and the tank is always full of miscellaneous drainage flowing from the pipe A. Can be vigorously stirred in the tank to form oil droplets, which can be reliably sent to the pump together with miscellaneous wastewater.
The shape of the miscellaneous drainage suction tank is not limited, and may be cylindrical or cubic. In the case of a cubic shape, a length of about 300 to 450 mm, a width of 200 to 350 mm, and a height of about 70 to 95 mm is preferable. Although not limited, for example, stainless steel is preferably used.
A pipe B connects the submersible pump to the pressure tank or nozzle.

The pump used in the “outside tank installation type” is, for example, a self-priming pump such as a uzumaki pump, a cascade pump, a plunger pump or the like.
In the case of the “outside tank installation type”, a system in which the miscellaneous drainage suction tank fixedly installed at the bottom of the storage tank is connected to an externally installed pump by a pipe C, and an externally installed pump by a pipe E whose tip is an inlet. In both cases, the pump and the pressure tank or nozzle are connected by a pipe D.
The miscellaneous drainage suction tank is the same as that used for the “inside tank type”, but is attached to the tip of the pipe C so that a check valve having a function of backflow prevention is located in the box. This prevents backflow of miscellaneous wastewater while the pump is stopped.
An oil component guide groove can be installed at the suction port so that the oil component floating on the surface of the miscellaneous drainage can be reliably sucked. The oil component guide groove will be described later.

In the miscellaneous wastewater treatment apparatus of the present invention, pipes used to feed miscellaneous wastewater include a pipe (1) that sucks miscellaneous wastewater in the miscellaneous wastewater storage tank and feeds it to the pump, and a pump. It is roughly divided into a pipe (2) for sending compressed miscellaneous wastewater to the nozzle.
The diameter of the pipe is not particularly limited and can be appropriately selected depending on the apparatus. In the case of the pipe (1), a pipe of about 50A to 65A (1A = 0.04 inch) is preferable, and in the case of the pipe (2) Is preferably about 40A to 50A.
The material of the pipe is not particularly limited, but, for example, a rust-resistant and oil-resistant material such as stainless steel or vinyl chloride is preferably used.

The number of nozzles used in the present invention may be one or more, and can be appropriately selected depending on the scale of the wastewater treatment apparatus. When two or more nozzles are used, a tank (pressure) fixed integrally with the nozzles is used. It is preferable to use a tank). The pressure tank can temporarily store miscellaneous wastewater that has been pressurized and fed by a pump, and can substantially equalize the pressure of jet water from each nozzle.
Since the pressure tank is required to have high pressure resistance, a cylindrical shape is preferable, and a diameter of about 100A to 350A, particularly about 150A to 250A is preferably used. For example, SUS304 or more made of stainless steel (thickness of about 6 mm) is preferable.

The miscellaneous wastewater treatment apparatus of the present invention is characterized in that miscellaneous wastewater sucked from a storage tank is radiated into the miscellaneous drainage of the storage tank again through a nozzle as a high-speed water jet.
Organic matter contained in miscellaneous wastewater can be decomposed by the cavitation effect due to high energy generated by this injection method. Further, according to the verification by the present inventors, as the cavitation effect due to the high energy in the present invention, miscellaneous wastewater When microorganisms or bacteria are present in the inside, it was confirmed that they have a disinfecting action to kill them.

The nozzle constituting the treatment apparatus of the present invention is not particularly limited as long as it is a nozzle that normally generates cavitation. For example, a venturi method or an orifice method can be applied, and contents of miscellaneous wastewater, an inflow amount, or a storage tank Depending on the size, it can be selected as appropriate, and in the case of using a plurality, it can be used in combination.
One end of a venturi tube used in the venturi system is connected to a pipe, and the orifice system is the same.
Venturi pipe or orifice miscellaneous drain outlets are usually circular, and the diameter of the outlet greatly affects the pressure of the jet water and the resulting cavitation effect, and must be carefully selected. It is.
According to the verification results of the present inventors, the diameter is preferably 4 to 14 mm, more preferably 7 to 12 mm, in order to effectively exhibit the cavitation effect. If it is less than 4 mm, the resistance pressure increases, so that the flow rate of miscellaneous wastewater decreases. If it exceeds 14 mm, the energy generated by the injection tends to decrease and the cavitation effect tends to decrease.
The material of the venturi tube is not limited, but stainless steel is preferably used.

As a Venturi type nozzle, a nozzle having a double-pipe structure consisting of a Venturi tube (also referred to as a nozzle body) itself and an air supply tube (also referred to as a cover pipe) that contains the Venturi tube coaxially is used. Can do.
FIG. 6 is a cross-sectional view showing a first example of a nozzle having a double tube structure used in the present invention.
The double pipe structure includes a venturi tube 101 and an air supply tube 102 coaxial with the venturi tube, and the air supply tube 102 is fixed to a flange 109 at a position where the venturi tube is incorporated, and the outer surface of the venturi tube And a space portion is provided between the inner surface of the air pipe.
The venturi pipe is fixed to the pressure tank by a mounting screw 104 on the miscellaneous drainage inlet side.
The inside of the Venturi tube 101 is divided into a straight portion 105 and a tapered portion 106, and it is preferable to give an arc of about 3R to 4R to the portion connecting the straight portion 105 from the mouth portion 107 into which miscellaneous drainage flows. The diameter of the venturi tube means the inner diameter of the straight portion.
The length of the straight portion 105 is not limited, but is preferably about 15 to 30 mm, and the length of the Venturi tube including the straight portion 105 and the tapered portion 106 is preferably about 45 to 100 mm.

Further, a through hole 103 is provided in the wall portion of the air supply pipe 102, and the through hole 103 mainly functions as an inlet for an oxidation accelerator or the like.
When miscellaneous wastewater is ejected from the venturi pipe, outside air or liquid sucked by the ejected miscellaneous drainage is discharged through the space and the through hole, and when jetting a high-speed water jet into the miscellaneous wastewater, air bubbles or ozone Since bubbles are also jetted at the same time and air bubbles are mixed with the cavitation bubbles, it is much more effective in decomposing oil and fat in miscellaneous wastewater than when there is no air bubbles.
The through-hole 103 can be a screw hole, and a pipe or hose having an inner diameter of about 2 to 4 mm is attached to the through-hole 103. An air suction cock is installed at the tip of the through-hole 103. Oil that can be used to supply gases and liquids that increase the amount of dissolved oxygen in various wastewater, as well as gases and liquids that promote decomposition other than these gases, and floats on the surface of the wastewater in the wastewater If the oil is sucked and injected into the high-speed water jet from the nozzle tip through the through hole, the oil component can be effectively decomposed.
It is also possible to provide intake air amount adjusting means at the tip of a pipe or hose attached to the through hole.
In addition, since air bubbles may cause scum formation in the miscellaneous drainage that is likely to scum on the water surface, it is necessary to use this through hole in view of the actual situation.

FIG. 7 is a sectional view showing a second example of a nozzle having a double tube structure used in the present invention.
In the figure, the same numbers as those in FIG.
The difference between the second double-pipe structure nozzle and the first double-pipe structure nozzle is that the gas and / or liquid inflow hole 108 penetrates through the wall of the air supply pipe 102 in addition to the through-hole 103. The hole 103 is provided on the flange 109 side as a base point, and the number thereof is 2 to 4 depending on the size of the hole.
When miscellaneous wastewater is sprayed from the tapered portion 106 of the nozzle, the vicinity of the sprayed portion is decompressed to generate a suction force, and this suction force is transmitted through the space provided between the venturi tube and the air supply tube. A gas and / or liquid is sucked from the inflow hole 108, and the flow of gas or the like formed in the space portion exerts an effect of promoting the suction of the oxidation accelerator or the like from the through hole 103.

FIG. 8 is a cross-sectional view showing an example of a nozzle not having a double-pipe structure used in the present invention.
In the figure, the same numbers as those in FIGS. 6 and 7 mean the same thing.
The difference between this nozzle and the second double-pipe structure nozzle is that the suction pipe 111 does not have the air supply pipe 102 and instead of the through-hole 103 that functions as an inlet for the oxidation accelerator or the like provided in the air supply pipe. It is a point to provide.
The suction pipe 111 is provided with a fine hole that generates a fog spray phenomenon at the tip, passes through a hole in the pipe 102 having a diameter larger than the venturi 101, and the tip is positioned near the axis of the venturi 101. Further, the pipe 102 is fixed by a screw 110 of the venturi tube 101.
During the high-speed jet, the vicinity of the tip of the suction pipe 111 is depressurized, and gas and / or liquid exhibiting an oxidation promoting effect are sucked from the outside through the suction pipe 111, and a fog spray phenomenon occurs at the tip of the suction pipe. It is ejected with a high-speed jet.

The miscellaneous wastewater treatment apparatus of the present invention can comprise a radical water generator in addition to a pump and a nozzle.
The radical water generating means has a function of generating radical reaction water. As described above, when the high-speed water jet from the nozzle is radiated into miscellaneous wastewater, or after this, the radical reaction water is injected to decompose organic matter. Can be increased.
This radical reaction water can further enhance the disinfection action of the high energy of bubble collapse.

The miscellaneous wastewater treatment apparatus of the present invention described above can exist independently and can be combined with a miscellaneous wastewater storage tank when used, but it is attached to the miscellaneous wastewater storage tank from the beginning as a miscellaneous wastewater treatment system. It can also exist.
Moreover, the miscellaneous wastewater treatment apparatus can be mounted on a gantry and can be moved.

Next, the miscellaneous wastewater storage tank used in the present invention will be described.
The installation location of the miscellaneous wastewater storage tank is not limited, and the miscellaneous wastewater storage tank may be installed so that most of it is buried indoors, outdoors, or on the ground.
The shape and material of the miscellaneous wastewater storage tank are not particularly limited, but a cube is frequently used for the shape, and the material is, for example, a plastic such as concrete or FRP, or a stainless steel having high rust resistance. Such metals can be used.
Further, the condition of the volume of the miscellaneous wastewater storage tank is not limited. For example, it is about 150 to 350 liters for small restaurants, and about 4 to 6 cubic meters for large food processing factories. Is applicable.

In the miscellaneous wastewater storage tank, untreated miscellaneous wastewater and / or treated miscellaneous wastewater ejected from the nozzles are stored, and an inflow port and an outflow port are provided.
The shape of the inflow port and the outflow port provided in the side wall portion of the miscellaneous wastewater storage tank is not limited, but a circular shape connected to the pipe can be used. A size of about 5 inches is preferable, and the inflow port is provided at a position higher than the outflow port so that miscellaneous drainage flows, and the outflow port is installed at a location where the outflow starts when the miscellaneous drainage becomes full. .
The diameters of the inlet and outlet, that is, the diameter of the pipe are not limited, but those of 3 to 5 inches are preferably used.
The height difference between the inlet and the outlet is, for example, about ½ of the pipe diameter.
Furthermore, an oil / water separation plate can be provided to partition the storage tank into an untreated miscellaneous wastewater inflow side and a miscellaneous drainage outflow side. In this case, miscellaneous wastewater is sent from the inflow side to the outflow side. The oil / water separator plate is provided with a hole for causing the oil / water separation.
By partitioning the untreated wastewater inflow side and the wastewater outflow side with this oil / water separator plate, the oil component in the wastewater newly flowing in from the inflow port is prevented from diffusing to the wastewater outflow side, The oil component can be surely flowed and sucked toward the pump.
The shape of the hole formed in the oil / water separator plate is not limited. However, if the V-shaped notch is used, it is effective to prevent the inflow of solid matter.

As the wastewater that can be treated by the miscellaneous wastewater treatment system of the present invention, for example, those in which relatively large solids such as meat pieces and vegetables that are produced during cooking at restaurants are removed in advance are preferably applied. For this purpose, solids separating means are used.
As the solid matter separating means, before the untreated miscellaneous wastewater flows into the storage tank, for example, a water collecting tank for temporarily storing the wastewater containing the solid matter is provided at the tip of the pipe connected to the inlet, and the water collecting tank In combination with or separately from the method of inserting and separating a separating slag made of netting material, install it inside the storage tank, for example, install a separating slag near the untreated miscellaneous wastewater inlet, It is possible to adopt a method of removing the solid matter by allowing the miscellaneous wastewater contained therein to once flow into the separation tank.
For example, stainless steel or synthetic resin is used as the solid separation separator, and the mesh of the mesh is not limited. However, the present inventors have included the wastewater in the wastewater and the wastewater treatment system of the present invention. As a result of repeating the experiment on solids having a size capable of being decomposed by treatment, it was confirmed that those having a mesh of 10 to 30 mesh were preferable, and those having a mesh of 13 to 25 mesh were preferably usable.
Moreover, it is effective in removing the solid substance in the miscellaneous wastewater which flows from an inflow port if this solid substance separation means is installed just under the miscellaneous drainage inlet inside the storage tank.
Furthermore, in order to more effectively remove the solid matter, a strainer 16 for removing the solid matter larger than the opening diameter of the nozzle can be installed in the system that is sent from the pump to the pressure tank.

  Installation of the drainage pipe's miscellaneous drainage inlet as close as possible to the miscellaneous drainage inlet allows the oil component floating on the solid surface from the miscellaneous drainage from the inlet to be immediately sucked in by the duct. However, when the solid separation means is installed inside the storage tank, it is needless to say that the miscellaneous waste water suction port is adjacent to the solid separation means.

An object of the present invention is to make it possible to decompose an oil component contained in miscellaneous wastewater.
As mentioned above, the oil component usually has the property that when the mixed liquid of oil and water is left unattended, it floats on the surface of the water and floats on the surface of the water. Since it is necessary to collect and suck the pump without leaking as much as possible, in the present invention, a method of attaching a conical “funnel” to the miscellaneous drainage suction port at the tip of the pump, or attaching an oil component induction groove to the suction port, A method of fixing this in the hole provided in the oil-water separation plate described above can be adopted, but it is more effective to use the oil component guide groove.

The oil component guide groove may be cylindrical or cubic, and the size is not limited. For example, in the case of a box shape, the length is 350 to 450 mm, the width is 60 to 80 mm, and the height is about 60 to 80 mm. Preferably, the oil / water separation plate is fixed in accordance with a hole.
When the oil component guide groove is fixed, the hole to be formed in the oil / water separation plate is preferably provided at a position where the function of collecting the oil component floating on the water surface is sufficiently exerted, and the lowermost end of the hole is below the water surface. The uppermost end of the hole is above the oil layer floating on the water surface.For example, in the case of V-shaped cutting, it is preferable that the lowermost end of the V-shape is slightly below the water surface, for example, about 20 mm. The number of cuts is not limited and depends on the pump flow rate.
The oil component guide groove has one side of a cube or one circular plane of a cylinder fixed to the oil / water separator plate, and the other side or circular plane of a storage tank separated by the oil / water separator. For the inflow of miscellaneous drainage on the nozzle injection side, it is formed so as to be movable up to 25 to 35 mm, and a hole for miscellaneous drainage suction pipe is provided at the bottom of the oil component guiding groove.
On the side of the miscellaneous wastewater inlet of the storage tank separated by the oil / water separator plate, the oil component of the miscellaneous wastewater newly introduced floats on the surface, and this oil component is mixed with miscellaneous wastewater through the hole of the oil / water separator plate. The oil component can be introduced into the oil component guide groove, which is effective in collecting the oil component without leaking as much as possible.
That is, since the oil component diffused on the miscellaneous drainage surface on the miscellaneous drainage inlet side can be collected without leaking as much as possible by the oil component guiding groove, as a result, the mixed liquid of the oil component and miscellaneous drainage The oil component can be sucked into the pump in a relatively high ratio.

The miscellaneous wastewater storage tank that can be used in the miscellaneous wastewater treatment system of the present invention is not limited, but a cubic body can be preferably used.
In addition, when one or more jet receiving plates are installed and fixed in a direction in which miscellaneous wastewater is ejected from the nozzle, for example, at a position away from the nozzle tip, preferably 8 to 12 cm, bubbles are generated by the jet receiving plate. It has been confirmed that it is extremely effective for increasing the decay rate, which is preferable.
Furthermore, if the jet receiving plate is installed at an angle, miscellaneous wastewater ejected from the nozzle is reflected and flows in the direction of the suction port of the feed pipe, thereby improving the processing efficiency.
Although there is no restriction | limiting in the dimension and material of this jet-flow receiving plate, For example, the thing made from stainless steel of a magnitude | size about 150 * 150cm2-200 * 200cm2 is used preferably.
When miscellaneous wastewater is injected into the storage tank from the nozzle, the organic substance decomposes and reacts due to the expansion and collapse of the generated bubbles, and soot that is not decomposed rises to the surface and is sucked into the suction port. .

The tip that becomes the nozzle outlet is installed so that miscellaneous wastewater is jetted toward the miscellaneous wastewater storage tank, and in particular, it is installed so that the tip is below the miscellaneous drainage surface. It is preferable to make effective use. In particular, it is preferable to install the tip so that the tip is 7 to 12 cm from the miscellaneous drainage surface.
Moreover, it is preferable to install the nozzle front-end | tip part with an angle with respect to a miscellaneous drainage surface, and an angle of 40-50 degrees is especially preferable.
On the other hand, the miscellaneous drainage inlet needs to be installed so that it faces the surface of miscellaneous drainage and below the surface of the miscellaneous drainage, and is preferably installed so as to be perpendicular to the miscellaneous drainage surface. The suction vortex is formed, and the film and flag of the oil component floating on the surface of miscellaneous drainage can be reliably sucked.

Hereinafter, a method for treating miscellaneous wastewater and decomposing organic matter using the miscellaneous wastewater treatment system of the present invention will be described.
First, when the pump constituting the miscellaneous wastewater treatment system is operated, miscellaneous wastewater collected in the storage tank is sucked up from the suction port of the pipe and pressurized, and then the pressurized miscellaneous wastewater passes through the pipe from the pump. While being pressurized, the tip is jetted into the storage tank at high speed from a nozzle installed in the storage tank.
When a pressure tank is used, the pressurized miscellaneous wastewater is once stored in the pressure tank and then injected from the nozzle.
The jet water forms a large number of microbubbles in the water, and the high energy generated when the bubbles collapse after expansion works to decompose organic substances including oil components in the wastewater.

When the treatment work is started for the first time using the miscellaneous wastewater treatment system of the present invention that has not been used yet, it usually starts from a state where a full amount of miscellaneous wastewater has accumulated in the storage tank. Since all of the wastewater is untreated that has never been circulated through the treatment equipment and is in a state where the oil component has spread throughout, the flow of the storage tank is necessary to ensure that organic matter is decomposed by cavitation. The untreated miscellaneous wastewater is recirculated a plurality of times in the miscellaneous wastewater treatment apparatus and the storage tank until the oil component is not seen as a guideline with the inlet closed, that is, the circulation path is circulated. The number of times of reflux depends on the scale of the apparatus, but about 1 to 5 times is appropriate for a small scale.
In this way, once the first circulation work is completed, the pump is temporarily stopped. In this stopped state, the storage tank is full of miscellaneous drainage circulated through the circulation path, and all the pipes, pumps, And the nozzle (in some cases the pressure tank) is also clogged with miscellaneous wastewater.
Next, when the inflow port is opened and the pump is operated again, the untreated miscellaneous wastewater and the treated miscellaneous wastewater newly circulate in the circulation path, and the untreated miscellaneous wastewater continuously flows in, and Treated wastewater continues to flow out of the outlet.
The day's processing operation is terminated by stopping the pump.
Start work on the next day by operating the pump and closing the inlet of the storage tank to circulate miscellaneous wastewater in the storage tank, then opening the inlet, or opening the inlet from the beginning. Open or circulate miscellaneous drainage or can be appropriately selected according to the situation.

That is, untreated and treated wastewater does not flow separately in the storage tank, and most of the treated wastewater that has been processed through the nozzle is not discharged from the outlet, After being refluxed, mixed with untreated miscellaneous wastewater, and sucked from the suction port again, it is pressurized through the pump in the miscellaneous wastewater treatment device, injected from the nozzle into the storage tank, and such refluxing is repeated and circulated. It is considered that the organic matter is completely decomposed during the cavitation effect.
After the first treatment, the inflow and outflow of miscellaneous wastewater are basically performed continuously with the storage tank being full and the inlet and outlet being open. Thus, in the state where new untreated miscellaneous wastewater does not flow in, there is no outflow of treated miscellaneous wastewater.
In addition, when the miscellaneous wastewater treatment system is used for the first time, the miscellaneous wastewater that is filled in the storage tank is untreated that has not been circulated through the circulation path, but has been operated once. The remaining wastewater in the storage tank is a mixture of untreated and treated wastewater. Therefore, the work of closing the inlet and circulating the wastewater is the amount of wastewater. It can be done according to.
For example, in the case of a restaurant, except for the first processing operation described above, the storage tank is always full of miscellaneous wastewater, the inflow port is open, and the miscellaneous wastewater treatment device pump is operated when the store opens, The operation of stopping the pump at the time of closing the store is repeated every day. As a result, the treated miscellaneous wastewater can be purified to a BOD value of 600 ppm / liter or less and discharged in a state close to natural water.

Furthermore, the cavitation effect using the miscellaneous wastewater treatment system of the present invention having a pressure tank will be specifically described.
Wastewater from which various solids mixed in miscellaneous wastewater are removed by a solid separation network is pressurized by a pump and introduced into a pressure tank.
The pressurized miscellaneous wastewater in the pressure tank is ejected again into the miscellaneous wastewater as a high-speed water jet by a cavitation generating nozzle attached to the tank, and at this time, a cavitation bubble is generated, which grows and collapses in the miscellaneous wastewater.
At this time, a high energy with a shock wave having a pressure of several hundred MPa to several GPa and a high temperature of several thousand degrees is generated.

When the high energy is released into miscellaneous wastewater in the process created by the present invention, the present inventors decompose solutes to form molecules and atomic groups, and are particularly contained in food processing wastewater. Since most of the various organic substances were once heat-treated, they were considered to be easily decomposed and formed into molecular groups.
When the miscellaneous wastewater treatment system of the present invention was used, it was confirmed that miscellaneous wastewater was in a state close to natural water having a BOD value of 600 ppm / liter or less. Solute radical reaction is promoted, ionization is promoted, substitution reaction, etc. is promoted, and various reactions overlap to form a hydrocolloid, resulting in a stable colloid solution. Since this solution is a fragmented hydrocolloid, It is inferred that it dissolves well and decomposes to become H2O, CO2, and the like.

This phenomenon is noticeable when food processing wastewater treated by the cavitation effect is discharged into running water such as rivers, and the scent of fats and oils and organic matter contained in miscellaneous wastewater is decomposed and eliminated. confirmed.
In addition, miscellaneous wastewater treated with the bubble collapse energy of cavitation is a very concentrated hydrocolloid solution, so if you put a solution with many hydroxyl groups that are free radicals generated by radical reaction, it will be easy to get used to the general solution, It was confirmed that the wastewater can be discharged by further promoting decomposition and chemical reaction.

  The miscellaneous wastewater treatment system of the present invention can adopt a fully automatic operation system, for example, using a float or a timer from an ON or OFF switch operation.

  Next, with respect to the miscellaneous wastewater treatment system of the present invention, specific examples of the above-described pump installation method in the tank installation type and the tank external installation type will be described with reference to the drawings.

FIG. 1 is a conceptual diagram showing an example of a miscellaneous wastewater treatment system installed in a tank.
As the pump 10 of the miscellaneous wastewater treatment system in this example, it is installed in the storage tank 1, and for example, a submersible pump for sewage is used.
The three-dimensional miscellaneous wastewater storage tank 1 has an inlet 3 on the side surface thereof and an outlet 18 at a position slightly lower than the inlet, inflow of untreated wastewater from the inlet 3 and treatment from the outlet 18. The drainage of the spent miscellaneous wastewater is carried out through the pipes connected together.
In addition, a solid matter removing basin 4 is installed immediately below the inlet 3 of the miscellaneous wastewater storage tank 1, and the inlet 3 is provided so that the oil-water separator 5 is partially located on the water surface 20. The drainage tank 1 is fixed to both sides of the miscellaneous wastewater storage tank 1 that is substantially parallel to the side surface and the inlet 3 is not provided, and is spaced apart from the solid matter removing tank 4 so that the miscellaneous drainage tank 1 flows into the miscellaneous drainage stream. Separate the inlet side and the drainage outlet side.
An opening is provided between the tip of the oil / water separator plate 5 and the bottom of the storage tank 1 to allow miscellaneous drainage to flow, and the miscellaneous drainage inflow adjustment plate 22 is installed at the tip.

FIG. 9 is a three-dimensional view showing the oil component guiding groove 6 attached to the oil / water separation plate 5.
The oil component guide groove 6 shown in FIG. 9 has a cubic shape, and the top surface and one side surface are completely open. A hole connected to the pipe A is provided at the bottom, and the reservoir flow is provided on the other side surface. An opening 23 through which miscellaneous waste water on the outlet side flows is provided so that the amount of inflow can be adjusted.
The V-shaped hole 24 provided in the oil / water separation plate 5 is provided so that the lowermost end portion of the V-shape is slightly below the water surface, so that the oil component floating on the water surface is moved to the oil component guide groove 6 side. Flow can be collected.
The open side of the oil component guiding groove 6 is fixed so as to be partially located on the water surface 20 in accordance with this hole, and from the untreated waste water flowing from the V-shaped hole 24 provided in the oil / water separation plate 5 and the opening 23. The inflowing miscellaneous wastewater storage tank outflow side miscellaneous drainage is mixed in the oil component guiding groove 6 and flows into the pipe A.
In FIG. 1, the pressure tank 13 and the two cavitation generating nozzles 14 are cavitation generating means, but all of the cavitation generating nozzles 14 are provided in water and a part of the pressure tank 13 is positioned on the water surface 20. ing.
The pipe A is connected to the miscellaneous drainage suction tank 8, and the submersible pump 11 installed in the miscellaneous drainage suction tank 8 is connected to the pressure tank 13 by the pipe B.
A hole is made in the upper surface of the miscellaneous drainage suction tank 8 so that the position of the suction part at the base of the submersible pump 11 is matched, and the hole and the submersible pump are fixed so that there is no gap. It is installed so as to exist in the miscellaneous drainage suction tank 8.

FIG. 10 is a schematic view showing the function of the miscellaneous wastewater suction tank in the in-tank miscellaneous wastewater treatment system of the present invention.
The box-shaped miscellaneous drainage suction tank 8 is installed with its bottom fixed to the bottom of the storage tank 1, and an underwater pump 11 covered with a cover from an opening (not shown) provided on the upper surface of the suction tank. Is inserted and sealed so that there is no gap between the opening and the submersible pump 11, and the leg 11-1 of the submersible pump 11 is fixed to the bottom of the miscellaneous drainage suction tank 8.
The miscellaneous wastewater 2 flowing in from the inflow port and having an oil component on the water surface passes through a hole (not shown) of the oil / water separation plate 5 and along with miscellaneous drainage on the miscellaneous drainage outflow side of the oil / water separation plate 5. After flowing to 6, it flows into the miscellaneous drainage suction tank 8 through the pipe A from the outlet A- 1.
The inside of the miscellaneous wastewater suction tank 200 is always in a depressurized state by suction of the submersible pump 11, and the tank is always full due to miscellaneous drainage flowing from the oil component guiding groove 6 through the pipe A. The oil component is agitated in an intense water flow in the tank to form oil droplets, and is sucked into the suction port 11-2 (not shown) of the submersible pump 11 together with the miscellaneous waste water. After that, it is injected from the nozzle 14 through the pipe B, through the pressure tank 13.
In this way, all the oil components are sucked into the submersible pump 11, injected from the nozzle 14, and decomposed due to the cavitation effect.
If the outlet A-1 of the pipe A and the suction port 11-2 of the submersible pump 11 are adjusted in the vicinity, the oil component can be sucked into the submersible pump 11 without leakage.

If the hole provided in the oil / water separator plate 5 is V-shaped, it is effective in stopping the inflow into the miscellaneous wastewater suction groove 6 in the event that there is a solid that has not been removed by the solid matter removing rod.
Two jet receiving plates 16 having an angle are arranged apart from the tip of the cavitation generating nozzle 14 of the storage tank 1 to the bottom, and a radical water generator 17 is installed outside the storage tank 1. .

As shown in FIG. 1, after the solid matter flowing into the miscellaneous drainage storage tank 1 together with the untreated miscellaneous drainage 2 from the miscellaneous drainage inlet 3 is removed by the bowl-shaped solid matter removing net 4, the miscellaneous drainage 2 The oil component inside gathers on the water surface on the solids removal net side partitioned by the oil / water separator plate 5.
When the pump is operated, the untreated miscellaneous wastewater 2 including the oil component collected on the water surface flows into the oil component guide groove 6 through the V-shaped cut portion provided in the oil / water separator plate 5 due to the suction force. Untreated miscellaneous wastewater containing the oil component flowing into the oil component guiding groove 6 and miscellaneous wastewater stored on the side where the cavitation generating nozzle 14 is installed flow into the miscellaneous wastewater suction tank 8 through the miscellaneous wastewater suction pipe A.

All the miscellaneous wastewater in the miscellaneous wastewater suction tank 8 pressurized by the pump is sent to the pressure tank 13 through the high-pressure water supply pipe B, and then discharged from the cavitation nozzle 14 into the miscellaneous wastewater in the storage tank as a high-speed jet. The waste water is decomposed and purified by the effect of cavitation.
The cavitation nozzle 14 used here is the above-described double pipe structure, and the air sucked from the air suction cock 15 connected to the through-hole provided in the outer pipe by a pipe is jet water as fine bubbles. At the same time, after the release, the radical water using the tap water 21 is further supplied from the radical water generator 17 after hitting the jet receiving plate, so that the decomposition effect of the organic matter can be enhanced.

FIG. 2 is a conceptual diagram illustrating an example of a miscellaneous wastewater treatment system installed outside the tank.
1 is that the pump 10 is installed outside the storage tank 1, and a self-priming pump as described above is used as the pump. The
Also in this example, the miscellaneous drainage suction tank 8 is installed in order to suck the oil component, and miscellaneous drainage flowing through the pipe A connected to the oil component guiding groove 6 is temporarily stored in the miscellaneous drainage suction tank 8. Unlike the installation type in the tank, the miscellaneous drainage suction tank 8 is directly connected to the pump 10 by a pipe C, and the tip of the pipe C extended to the miscellaneous drainage suction tank 8 has A check valve 23 is fixed so that miscellaneous wastewater does not flow backward. The pump 10 and the pressure tank 13 are connected by a pipe D.
About points other than such a difference, it is the same as that in the tank installation type miscellaneous wastewater treatment system shown by FIG.

FIG. 3 is a conceptual diagram illustrating another example of the miscellaneous wastewater treatment system installed outside the tank.
The major difference from the outside tank installation type in FIG. 2 is that the oil component guide groove and the miscellaneous drainage suction tank are not used.
That is, the solid matter prevention shielding net is fixed so as to cover the hole formed in the upper part of the oil / water separation plate 5, and miscellaneous wastewater flows from the hole.
A conical drainage suction port 7 is provided at the tip of the pipe E connected to the miscellaneous drainage pump 10, and a check valve 23 is provided at an intermediate portion of the pipe E. The conical drainage suction port 7 is The oil component is easily sucked, and the drained water that has flowed in passes through the pipe E from the suction port 7 and is sent from the pump 10 to the pressure tank 13 through the pipe D.
About points other than such a difference, it is the same as that of the outside installation type miscellaneous wastewater treatment system shown by FIG.

FIG. 4 is a conceptual diagram showing another example of the miscellaneous wastewater treatment system installed outside the tank.
A major difference from the outside tank installation type in FIG. 2 is that the direction in which the cavitation generating nozzle faces is oblique.
In this case, the jet receiving plate 16 is not necessarily provided, and the side wall of the reservoir 1 exhibits the function of the jet receiving plate instead.
FIG. 5 is a conceptual diagram showing another example of a miscellaneous wastewater treatment system installed in a tank.
A major difference from the in-vessel installation type in FIG. 1 is that the direction in which the cavitation generating nozzle faces is oblique.
Also in this case, the jet receiving plate 16 is not necessarily provided, and the side wall of the reservoir 1 exhibits a function instead of the jet receiving plate.
As described above, when the nozzle is installed at an angle rather than facing the bottom, when dirt or filth accumulates at the bottom of the reservoir 1, the dust or the like is instantaneously caused by the miscellaneous drainage flow ejected from the nozzle. As a result, the amount of soaring can be reduced, and as a result, it can be reduced that the miscellaneous drainage inlet is blocked.

  Although the present invention is mainly considered as food processing wastewater as miscellaneous wastewater, according to experiments by the present inventors, the miscellaneous wastewater treatment system of the present invention is not limited to food processing wastewater, but various industrial wastewater. Furthermore, it was confirmed that it can be applied to the treatment of red tide.

  EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to the examples.

Production of miscellaneous wastewater treatment system installed in tank

(Referred to as System A)
As a storage tank, it is a FRP cube shape with a length of 800 mm, a width of 700 mm, and a height of 650 mm (inside dimensions), and a circular miscellaneous drainage inlet and outlet with a diameter of 100 mm at the center upper end on both sides in the width direction. The inlet shaft was formed 50 mm higher than the outlet shaft, and a pipe having a diameter of 100 mm was connected to the inlet and the outlet.
The pump is a cylinder (approximately 5.2 liters) with a discharge rate of 200 liters / minute (flow rate per minute: 0.71 times), a lift of 9 m, a height of 340 mm, and a diameter of 140 mm. A covered submersible pump for sewage (model 50PU2.75 manufactured by Tsurumi Seisakusho Co., Ltd.) was used.

  In addition, as a miscellaneous wastewater suction tank, a tank made of stainless steel (SUS304 made by Nippon Stainless Steel Co., Ltd.) having a length of 550 mm, a width of 250 mm, and a height of 85 mm (about 11.6 liters) is prepared. A tank is prepared, and the pump is installed in the hole exactly the same as the outer shape of the base of the cover (cylindrical body) of the rotary blade of the submersible pump provided on the upper surface.

In addition, a pressure tank was prepared in which both ends of a stainless steel pipe (SUS304, Nippon Stainless Steel Co., Ltd.) having a length of 400 mm and an inner diameter of 100 A were closed with a stainless steel plate having a thickness of 6 mm.
A 50A stainless steel socket is welded to the central part of the pressure tank, shifted by 45 ° from this position, and two 20A sockets are separated and attached at intervals of 250mm. The center is 50mm above the horizontal line. Connect and fix the outlet of the submersible pump and the 50A socket of the pressure tank with a high-pressure water pipe.

The nozzle used was made of stainless steel with a double structure as shown in FIG. 4. The straight part is 23 mm long, the arc is 3.5R, the diameter is 8 mm, and the taper-like part (trumpet shape) is long. A Venturi tube having an outer diameter of 30 mm and an inner diameter of 10 mm is used. The taper-shaped portion of the Venturi tube has an outer diameter of 42.7 mm and a length of 30 mm. , Coaxially so as to be covered with a 3.5 mm thick flow pipe (SGP32A), and sealed and fixed with a 6 mm thick stainless steel plate on the boundary with the straight part of the taper-like part .
A through hole (M6 tap) of a screw hole is provided in the central portion of the flow pipe in the length direction, a pipe is connected to the through hole, and an air suction cock is attached to the tip of the pipe.

On the opposite side of the discharge port, a hole is made in the miscellaneous drainage suction tank, and the tip of the miscellaneous drainage suction pipe (60A pipe) is inserted. Extend it close to the pump inlet.
The miscellaneous drainage suction pipe is fixed to the hole by a flange so that there is no air leakage outside the suction tank, and the miscellaneous drainage suction pipe upper portion (other tip) is separately prepared as an oil component induction groove. It is made to penetrate through a hole formed in the bottom surface of the plate, and is fixed so that there is no air leakage with a flange in a state where the tip portion is raised 1 to 2 mm above the bottom surface.
The oil / water separator plate is made of stainless steel, the length of the storage tank in the depth direction is 650 mm, the width is 700 mm, a triangular incision is provided at the center near the upper part to 40 mm below the horizontal line, and the oil / water separator plate and The lower part of the oil / water separator plate has a movable structure so that the gap between the bottom of the storage tank and the bottom of the storage tank is 100 mm at maximum, and the upper end of the oil / water separator plate is fixed to be higher than the miscellaneous drainage surface.
By this movable structure, for example, when untreated miscellaneous waste water suddenly flows in a large amount, it can be adjusted so that the suction groove does not overflow.

The oil component guide groove is a stainless steel box shape having a length of 400 mm, a width of 70 mm, and a height of 70 mm, but the upper surface and one side surface that is fixed in accordance with the triangular notch of the oil / water separator plate are open. In the state, the lower side of the other side surface is formed so as to be movable up to a maximum of 30 mm for inflow of miscellaneous drainage, and a hole for miscellaneous drainage suction pipe is provided on the bottom surface. The miscellaneous drainage suction pipe is attached to the center of the triangular notch of the oil / water separation plate so that all the oil components existing in the vicinity of the miscellaneous drainage surface of the oil / water separation tank flow into the oil component guiding groove.
A stainless steel frame (manufactured by SUS304 Nippon Stainless Steel Co., Ltd.) is provided on the opposite side of the oil / water separator plate from the groove, and a solids removing rod (stainless steel, .18 mesh) is installed.
Further, cavitation generating nozzles (using a venturi tube having a diameter of 8 mm) were attached to each of two sockets 20A of the pressure tank to produce an in-tank miscellaneous wastewater treatment system as shown in FIG.

Production of miscellaneous wastewater treatment system installed outside the tank

(Referred to as system B)
In the above system A, a storage tank having the same conditions as system A is used, except that the storage tank is made of concrete having a length of 1025 mm, a width of 1000 mm, a depth of 1300 mm (1332 liters) and a full capacity of 1025 liters. In addition, except for installing a pump of 65 x 50 FS2E62.2 manufactured by Ebara Co., Ltd. with a discharge rate of 700 liters / minute (flow rate per minute: 0.68 times) and a lift of 15 m , Oil water separator plate with the same conditions (dimensions changed from storage tank), oil component induction groove, suction tank, and further installed a radical water generator, and installed outside the tank with the configuration shown in FIG. A miscellaneous wastewater treatment system (referred to as system B) was prepared.

Example 1
(Experiment (1) using in-tank miscellaneous wastewater treatment system (System A))
The miscellaneous wastewater treatment experiment (1) is performed at the udon cafeteria in Yufu City, Oita Prefecture, where the above system A is installed outside the store with the top opening slightly buried above the ground. The miscellaneous wastewater to be treated had an oil content of about 0.1 liter / min and contained rice tofu soup, udon boiled soup, dishwashing water, and the like.
The amount of water used in the cafeteria is about 6 to 10 M3 per day, and about 5 M3 / H at maximum use. The maximum inflow of miscellaneous wastewater is 83 liters / minute, and the maximum inflow of oil components is 0.1 liters / minute. There was a minute.

First, after filling the storage tank with untreated miscellaneous wastewater, closing the miscellaneous drainage inlet, operating the pump at 10:00 am and refluxing the untreated miscellaneous wastewater in the storage tank for 5 minutes The inflow of the untreated miscellaneous wastewater was opened by opening the inflow port, and the treated miscellaneous wastewater continued to flow out from the outflow port, and the operation was continued until 8:30 pm and ended. Thereafter, the same operation was repeated for 5 days.
As a result, the scum that floated on the surface from the previous day to the previous day disappeared, the drainage became cloudy yellowish, and the sewage odor that existed until then almost disappeared (the part that remained around was a little smelly), Even if it was touched by hand, the stickiness and sliminess of oil disappeared.
The BOD value of the treated waste water was 400 ppm.

The low BOD value was achieved because it was estimated that miscellaneous wastewater circulated and returned multiple times and received a sufficient cavitation effect. When the number of recirculations in the order of the nozzle and the storage tank is calculated, it is as follows.
1) About the total number of miscellaneous wastewater stored in the storage tank, the number of refluxes performed in the first 5 minutes: about 3.8 times.
(A) Pump discharge rate: 200 liters / minute (b) Storage tank fullness: 263 liters (c) Recirculation frequency: (a) × 5 minutes ÷ (b) = about 3.8 times.
2) Number of miscellaneous wastewater recirculation after opening the inlet (estimated assuming that the inflow of miscellaneous wastewater flows out in the Tokoroten method): about 2.41 times.
(D) Maximum inflow / min: 83 liters (miscellaneous wastewater) +0.1 liters (oil component) = 83.1 liters (e) Number of recirculations: (a) ÷ (d) = about 2.41 times / min

Example 2
(Treatment experiment with in-tank miscellaneous wastewater treatment system (System A) (2))
The miscellaneous wastewater treatment experiment (2) is conducted at a Chinese restaurant in Hakata City, Fukuoka Prefecture, with System A installed in the same way as in Experiment (1). In a minute, it contained boiled soup, soup, pots / pots, tableware, floor washing water, and the like.
The water consumption of the restaurant is about 15M3 per day, about 8M3 / H at maximum use, the maximum inflow of miscellaneous wastewater is about 133 liters / minute, and the maximum inflow of oil components is about 0.3 liters. / Min.

First, the storage tank was thoroughly cleaned before the start of use on the first day, and after emptying, the untreated miscellaneous wastewater was introduced to fill the reservoir tank, and the miscellaneous drainage inlet was closed.
Next, the pump is operated at 10:00 am to recirculate untreated miscellaneous wastewater in the storage tank for 5 minutes, and then the inlet is opened to start inflow of untreated miscellaneous wastewater. The operation was continued until 11 pm and was terminated.
From the next day, the wastewater that is full at the end of the previous day is recirculated for 5 minutes after closing the inlet, then the inlet is opened and inflow of untreated wastewater is started. This was repeated for 5 days.
The result is that there is no scum on the surface of the water, the drainage is cloudy yellowish, the sewage odor is hardly felt (a little odor was left in the surroundings), and even if it is touched by hand, it becomes sticky and oily There was no.
The BOD value of the treated wastewater was 488 ppm.

A trial calculation of the number of times that miscellaneous wastewater has returned from the storage tank to the pump, pressure tank, nozzle, and storage tank in this order is as follows.
1) About the total number of miscellaneous wastewater stored in the storage tank, the number of refluxes performed in the first 5 minutes: about 3.8 times.
(A) Discharge rate of the pump: 200 liters / minute (b) Full capacity of the storage tank: 263 liters (c) Number of reflux cycles: (a) × 5 minutes ÷ (b) = about 3.6 times.
2) Number of recirculations of miscellaneous wastewater after opening the inflow opening (estimated assuming that the inflow of miscellaneous wastewater flows out in the Tokoroten method): about 1.5 times.
(D) Maximum inflow / min: 133 liters (miscellaneous wastewater) +0.3 liters (oil component) = 133.1 liters (e) Number of recirculations: (a) ÷ (d) = about 1.5 times / min

Example 3
(Treatment experiment with in-tank miscellaneous wastewater treatment system (System B) (1))
The miscellaneous wastewater treatment experiment is conducted using the system B at the Sakai Bento factory in Fuji City, Shizuoka Prefecture, and the miscellaneous wastewater to be treated is assumed to contain many kinds of organic substances including oil components. The oil content was 0.66 liter / minute, and the rest was mainly wash water.
The amount of water used in this factory was 50 M3 per day, and 170 liters / minute at maximum use.
Since the lowermost position of the outlet is 1500 mm from the upper end of the storage tank, the full capacity of the storage tank is 1178 liters (1025 mm × 1000 mm × 1150 mm) calculated with a height of 1150 mm. Approximately 1166 liters, with 11.6 liters removed.

First, after closing the miscellaneous wastewater inlet at 3 am to stop the inflow of untreated miscellaneous wastewater, the pump was operated and about 800 liters of untreated miscellaneous wastewater accumulated in the storage tank was sprayed for 5 minutes. The inflow of untreated wastewater was started by opening the inlet. After that, it went on for 6 consecutive days, stopped at 3pm on the last day, started at 3am the next day, and repeated the same work continuously for 6 days.
As a result, the oil film and scum disappear, and the liquid becomes cloudy. The odor was not felt, and there was no sliminess, and the white turbidity disappeared even if it was discharged into a stream through a side groove.
The BOD value of the treated miscellaneous wastewater was 280 ppm.

A trial calculation of the number of times that miscellaneous wastewater has returned is as follows.
1) About the total number of miscellaneous wastewater stored in the storage tank, the number of refluxes performed in the first 5 minutes: about 3.8 times.
(A) Discharge amount of pump: 700 liters / minute (b) Full capacity of storage tank: about 1166 liters (c) Number of recirculation cycles: (a) × 5 minutes ÷ (b) = about 3.0 times.
2) Frequency of miscellaneous wastewater recirculation after opening the inlet (estimated assuming that the influent flow of miscellaneous wastewater flows out in the Tokoroten method): about 4.12 times / minute (d) Maximum inflow / minute: 170 liters (Miscellaneous wastewater) + 0.66 liters (oil component) = 170.66 liters (e) Number of reflux times: (a) ÷ (d) = about 4.12 times / minute

It is a conceptual diagram which shows an example of the tank installation type miscellaneous wastewater treatment system of this invention. It is a conceptual diagram which shows an example of the outside installation type miscellaneous wastewater treatment system of this invention. It is a conceptual diagram which shows the other example of the outside installation type miscellaneous wastewater treatment system of this invention. It is a conceptual diagram which shows the other example of the outside installation type miscellaneous wastewater treatment system of this invention. It is a conceptual diagram which shows the other example of the outside installation type miscellaneous wastewater treatment system of this invention. It is sectional drawing which shows an example of the double tube | pipe type cavitation generation nozzle used for this invention. It is sectional drawing which shows the other example of the double tube | pipe type cavitation generating nozzle used for this invention. It is sectional drawing which shows the example of the cavitation generating nozzle which is not a double pipe type used for this invention. It is a three-dimensional view of the miscellaneous wastewater suction groove used for the in-tank miscellaneous wastewater treatment system of this invention. It is the schematic diagram which showed the function of the miscellaneous wastewater suction tank in the in-tank type miscellaneous wastewater treatment system of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Miscellaneous drainage storage tank 2 Untreated miscellaneous drainage 3 Miscellaneous drainage inflow port 4 Solid matter removal tank 5 Oil / water separation plate 6 Oil component guide groove 7 Miscellaneous drainage inlet 8 200 Miscellaneous drainage intake tank 9 Check valve 10 Pump 11 Submersible pump 11-1 Legs of submersible pump 11-2 Suction port of submersible pump 13 Pressure tank 14 Cavitation generating nozzle 15 Air intake cock 16 Jet receiving plate 17 Radical water generator 18 Miscellaneous drainage outlet 19 Treated miscellaneous drainage 20 Water surface 21 Water supply Water 22 Miscellaneous drainage inflow adjustment plate 23 Opening 24 V-shaped hole A Pipe A
A-1 Pipe A outlet B Pipe B
C Pipe C
D Pipe D
E Pipe E
DESCRIPTION OF SYMBOLS 101 Venturi pipe 102 Air supply pipe 103 Through-hole 104 Attachment screw 105 Straight part 106 inside a venturi pipe Tapered part 107 inside a venturi pipe Mouth part 110 of a venturi pipe Attachment screw 111 Suction pipe 112 Suction pipe fixing pipe

Claims (3)

  A waste water treatment apparatus for purifying food processing waste water containing oil components, a pump for sucking and pressurizing the waste water in the storage tank, and the waste water from the suction port by the suction force of the pump And at least a nozzle for directly injecting the wastewater pressurized by the pump into the storage tank, while the pump is in operation. A miscellaneous wastewater treatment apparatus is characterized in that a circulation path for miscellaneous wastewater that sequentially flows through the tank, the pump, the nozzle, and the storage tank is formed.   The miscellaneous wastewater treatment system formed by attaching and fixing the miscellaneous wastewater treatment apparatus according to claim 1 to a miscellaneous wastewater storage tank.   The miscellaneous wastewater treatment system according to claim 2, wherein the miscellaneous wastewater suction port is directed toward the water surface and below the water surface, and the pump is operated to circulate through the circulation path formed. The wastewater treatment method is characterized by injecting the wastewater from the nozzle and purifying the wastewater by the cavitation effect generated at that time.

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