JP5022128B2 - Sludge volume reduction equipment - Google Patents

Description

  The present invention relates to a sludge volume reducing facility for reducing the volume of sludge generated at a purification center or the like, and more particularly to a sludge volume reducing facility for promoting biodegradation by making the sludge ultrafine to a micron level.

Conventional treatment facilities for sewage including human waste include nitrogen oxides contained in organic wastewater such as sewage, human waste, and various industrial wastewater in an anaerobic treatment tank with a granular sludge bed of methane fermentation bacteria. There is a biological denitrification method in which denitrifying bacteria are propagated around granule sludge while being circulated in an upward flow and biologically reduced and denitrified (see Patent Document 1). This can granulate the microbial cells themselves to hold the microbial cells at a high density, and can be operated at a high volume load.
JP 7-290088 A

  In the biological denitrification method as described above, the suspended organic matter itself of the object to be processed is a granular material or flake of about several millimeters to 0.1 millimeter, and the bacteria that act on it are in a granular state, for example, high density contact. However, the effects are limited. On the other hand, the granular sludge settled by denitrifying bacteria is formed in a short period of time, and the sludge accumulates relatively quickly as long as a stable granular sludge bed can be maintained, and the treatment of the sludge is also an important issue.

The object of the present invention is to release the high pressure swirling water flow of at least 5 Kg / cm ² or more generated by the pump in the ultrafine device in the conical cavity chamber and from the cavity chamber into the apparatus tank. Organic matter and sludge in the sewage are made ultrafine by cavitation generated by the water, well dispersed in the water with what kind of action, aeration tank such as oxidation ditch etc. on floating organic matter and sludge with extremely large surface area per unit weight Sludge volume reduction can be achieved by performing biodegradation treatment efficiently and in a very short time, greatly increasing the treatment capacity of sewage, and eliminating sludge production by repeated biodegradation treatment with aerobic bacteria Equipment is provided.

The present invention is a receiving tank that receives supply of sewage containing organic matter such as septic tank sludge;
An aeration tank that receives supply of sewage from the receiving tank via a distribution tank and decomposes organic matter with aerobic bacteria and protozoa;
A settling tank that receives sewage that has been decomposed and precipitates sludge produced in the process;
A final treatment tank that receives intermediate treated sewage from the sedimentation tank and performs pH treatment before discharge;
The intermediate treated sewage with a large amount of sludge is received from the bottom of the settling tank, and a high-pressure water flow of 5 kg / cm ² or more generated by a pump is turned into a high-speed swirl flow in a conical chamber and sheared into water and contained organic matter. And an ultrafine device that applies a force and a compressive force, and applies cavitation generated by release into the device tank to at least micronize organic matter to the micron level and return it to the aeration tank. This is a sludge volume reduction facility.

  The receiving tank may have a floating substance removing device that removes floating substances floating in the supplied sewage.

  The aeration tank is composed of at least a pair of oxidation ditch arranged side by side, and in addition to receiving the supply of ultrafine treated sewage from the ultrafine refiner, the aeration tank also returns the sludge returned from the sedimentation tank by a pump. Can be supplied.

  A portion of the intermediate treated sewage having a large amount of sludge from the bottom of the settling tank is supplied to the sludge concentration tank by valve control, and the supernatant water of the sludge concentration tank is sent to the distribution tank through a drain tank and The condensed sludge from the bottom of the sludge concentration tank is sent to the sludge fermentation and decomposition apparatus through the sludge storage tank.

  The ultrafine device can include a residue removing device, a stirrer, an alkaline agent injection unit, and an adjustment tank having a quantitative maintenance float device as a pretreatment device.

The ultrafine device is a device that injects a high-speed swirling jet into a device tank holding a fluid containing organic matter, ultrafinely refines the organic matter in the fluid with an impact force, and melts it in the fluid.
A small-diameter outlet that is opened in the peripheral surface of the main body of the apparatus and injects the high-speed swirling jet;
A conical inner cavity chamber that tapers from a large-diameter cavity inside the body of the device towards the small-diameter outlet, at least partially having a circular part;
A supply port formed in the peripheral surface of the device body for supplying a fluid having a pressure of 5 kg / cm ² or more from the tangential direction to the inner cavity chamber to generate a high-speed swirling flow in the inner cavity chamber; It is characterized by having.

  The device main body is formed in a substantially cylindrical shape or a spindle shape, and is disposed between both side casings having the outlets formed on both end surfaces, and both side casings, and forms a supply port on the inner peripheral surface of the large-diameter inner cavity portion. And a central casing.

  The internal cavity chamber has a circular inner peripheral surface, and includes a central internal cavity portion of a central casing having the supply port, and a side tapered internal cavity portion having the outlet.

  Each of the both end faces has a circular hole with an edge that increases in diameter toward the outside, and the center line of the circular hole is aligned with the center line of the outlet and does not cover the circular hole. A plurality of thin nozzle disks stacked through a spacing disk with holes is attached.

  The both end faces have circular holes with edges each having a diameter increasing toward the outside, and the center line of the circular hole is shifted from the center line of the outlet by less than the radius of the circular hole. A plurality of thin nozzle discs stacked through a spacing disc having large holes that do not cover is attached.

  Bubbles are mixed in the pressure fluid supplied from the tangential direction in the circular portion of the internal cavity chamber.

In the sludge volume reducing equipment of the present invention, sewage containing organic matter such as septic tank sludge is received in the aeration tank through the receiving tank, and the organic matter contained in the sewage is decomposed by aerobic bacteria and protozoa in the aeration tank. It is possible to clear the regulations such as BOD (biological oxygen demand) and COD (chemical oxygen demand) in each region. Sludge that is inevitably generated during the decomposition process in the aeration tank is settled in the sedimentation tank, and intermediate treated sewage with a large amount of sludge is sucked from the bottom of the sedimentation tank by a pump, and a high-pressure water flow of 5 kg / cm ² or more. Is generated. This high-pressure water flow is introduced into the conical cavity chamber of the ultrafine device to make a high-speed swirling flow, and shear and compression forces are applied to water, organic substances and sludge, and released from the conical cavity chamber into the device tank. The cavitation and impact force generated by the above are applied to at least make the organic matter ultra fine to the micron level. The organic matter and sludge whose surface area per unit weight has been greatly enlarged by being ultrafine is returned to the aeration tank, and then efficiently biodegraded into carbon dioxide gas, water and heat in a short time. The supernatant of the sewage purified by repeated biodegradation treatment is received as intermediate treated sewage from the settling tank to the final treatment tank, where it is flocculated and pH adjusted by sulfate band flocculant, polymer flocculant, pH adjuster, etc. After adjustment, after treatment, it is discharged into rivers as treated water that has cleared regulations such as BOD (Biological Oxygen Demand) and COD (Chemical Oxygen Demand) in each region, while sludge production is reduced to zero. can do. In addition, the water that has undergone ultra-fine processing in the ultra-miniaturization equipment contributes to speeding up the biodegradation process by dispersing finely-divided micron-level organic matter and sludge almost evenly and finely. It is observed and experienced.

Since the receiving tank has a floating substance removing device that removes floating substances floating in the supplied sewage, an operation device such as a pump or a stirrer can be operated without any trouble.
The aeration tank is composed of at least a pair of oxidation ditch arranged side by side, and can flexibly handle the use of only one or both of the changes in the amount of sewage, and can ensure the operation of the facility while using one of them. Maintenance inspection becomes easy by stopping. In addition to receiving ultrafine-treated sewage from the ultrafine refiner, the sludge and organic matter that have undergone ultrafine treatment along with the return sludge are also supplied with a return sludge from the sedimentation tank by a pump. Will repeatedly undergo biodegradation.

  A part of the intermediate treated sewage with a large amount of sludge from the bottom of the settling tank is supplied to the sludge concentration tank by valve control, and the supernatant water of the sludge concentration tank is sent to the distribution tank through the drainage tank and the sludge concentration Condensed sludge from the bottom of the tank is sent to a sludge fermentation and decomposition apparatus via a sludge storage tank, so that fermented sludge effective as a fertilizer and soil conditioner can be generated as required.

  The ultra-miniaturization device can have a residue removal device, a stirrer, an alkaline agent injection part, and a regulating tank with a quantitative maintenance float device as its pretreatment device, which obstructs the operation of equipment such as pumps. The sewage residue such as sanitary products can be removed by the residue removal device, and the alkaline agent such as caustic soda is accurately injected from the alkaline agent injection part to the sewage whose amount is maintained by the quantitative maintenance float device. Thus, the cell membrane of sludge can be weakened, and the ultrafine refinement effect by the ultrafine refiner can be promoted.

In the ultra-miniaturization device, taper from the large-diameter cavity inside the main body toward the small-diameter outlet, and at least partially into the internal cavity chamber having a circular portion, the circular portion is 5 to 200 kg from the tangential direction. A fluid having a pressure of / cm ² is supplied from the supply port to generate a high-speed swirling flow that is accelerated while being compressed toward the outlet. When this compressed and accelerated high-pressure high-speed swirling flow is injected from the outlet into the device tank holding the fluid, it is more powerful due to rapid expansion and large-scale cavitation with a long reach by high-speed swirling action Can be generated. In addition, the impact force caused by the high-speed collision with the almost stationary fluid in the device tank and the powerful and large-scale cavitation action in the fluid in the fluid tank (the large volume accompanying the bubble destruction in the phase change foaming phenomenon from liquid to gas) The flaky and particulate organic matter is refined to the micron level by impact force. When a high-speed swirling flow is generated in the inner cavity chamber, a negative pressure is generated at the center thereof, and sucked back through the negative pressure center of the high-speed swirling flow ejected from the outlet toward the center of the negative pressure. It is presumed that a reverse flow is generated and collides with the jetting high-speed swirling flow to cause extremely strong vibration and cavitation at the center of the high-speed swirling flow. In the sludge, when micronized to the micron level, the cell membrane of the dead cells forming the sludge is destroyed and the cytoplasm is easily melted in the fluid. In that case, only a pressure fluid generating means such as a pump is used as an operating component, and stable continuous operation is possible with little maintenance over a long period of time. Since there are no small gaps where clogging is possible even if the organic substance is a fatty animal substance, continuous and efficient ultrafine processing is possible, and solubilization is promoted as a result. Like organic materials, various inorganic materials are also refined to reduce equipment wear and reduce the amount of precipitates. It is presumed that the sewage itself and the water molecule group (cluster) that have undergone such an ultrafine action are subdivided, and the ultrafine sludge and organic matter are well dispersed and the biodegradation process is carried out efficiently. Has been experienced.

When a treated fluid containing organic matter that has been ultra-miniaturized by this ultra-miniaturization device and whose specific surface area has been greatly expanded is supplied to an aeration tank, such organic matter is caused by various protists and bacteria such as fermentation bacteria Biodegraded in a short time. For example, if a spherical organic substance having a radius of 1 mm has a specific surface area of only 0.00120 m ² / g, but is refined into a spherical shape having a radius of 0.0001 mm, the specific surface area is 12.0 m ² / g. As many as 10,000 times the number of bacteria inhabiting the aeration tank can be attached to the surface, and it is possible to efficiently dispose of organic matter and mass culture of useful bacteria. become able to.

  The main body of the ultrafine device is substantially cylindrical or spindle-shaped, and is disposed between both side casings having the outlets formed on both end faces thereof, and between the both side casings, and the supply port is provided on the inner peripheral surface of the large-diameter internal cavity. If the center casing is formed, it is possible to generate a high-speed swirling flow toward both sides at the same time by supplying pressure fluid from one central portion. Further, when the inner cavity chamber has a circular peripheral inner surface and is composed of a central inner cavity portion of a central casing having the supply port and a side tapered inner cavity portion having the outlet, High-speed swirl flow can be efficiently increased and compressed along the circular inner peripheral surface, and more powerful and large-scale cavitation and shock waves can be generated when exiting the fluid tank. become.

  Both ends of the main body of the ultrafine device have circular holes with edges each having a diameter increasing toward the outside, and the circular hole is aligned with the center line of the outlet. When a plurality of thin nozzle discs stacked via gap discs with holes that do not cover the holes are attached, the nozzle discs are exposed to high frequency by exiting the outlet and partially expanding the high-speed swirling flow in each circular hole. Further, it is possible to generate cavitation by ultrasonic vibration, and to make use of the mechanical destruction action due to the sharp edge of each circular hole which is ultrasonically vibrated for ultrafineness. In that case, when the organic material to be processed is mixed with the pressure fluid to be supplied, it is particularly effective for ultra-miniaturization. Moreover, even if the edge is eroded by cavitation, the sharp rough surface formed one after another exhibits the same effect as the edge.

  Both ends of the main body of the ultrafine device have circular holes with edges each having a diameter increasing toward the outside, and the center line of the circular hole is less than the radius of the circular hole from the center line of the outlet. When a plurality of thin nozzle discs stacked via gap discs having a size that does not cover the circular holes are attached, the outlet and the portion of the high-speed swirling flow at the exit from each circular hole The nozzle disk can be oscillated at high frequency by expansion to further generate cavitation and shock wave by ultrasonic vibration, and the mechanical destruction action by the ultrasonic vibration edge of each circular hole can be utilized for ultra-miniaturization. . In that case, when the organic material to be processed is mixed with the pressure fluid to be supplied, it is particularly effective for ultra-miniaturization. Moreover, even if the edge is eroded by cavitation and shock waves, the sharp rough surface that is formed one after another exhibits the same effect as the edge. When each nozzle disk resonates and emits a high sound, the center of the circular hole of each nozzle disk can be slightly shifted from each other to prevent the resonance sound from interfering.

  If air bubbles are mixed into the internal cavity chamber by using an ejector or the like to the pressure fluid supplied from the tangential direction in the circular part, bubbles will be generated if fermenting bacteria or various bacteria are mixed in the supplied pressure fluid in advance. Becomes a cushion and has a high survival rate, and also provides good results against aerobic bacteria living in the fluid tank to which the pressurized fluid is injected. Compared with the bubble supply by the conventional roots blower, a lot of oxygen can be dissolved in the fluid with a compact and low electric consumption.

As shown in FIGS. 1 and 2, the sludge volume reducing equipment 1 according to the representative embodiment of the present invention receives supply of sewage W to be treated containing organic matter such as septic tank sludge through a sand settling part, A receiving tank 2 having a floating substance removing device 2A for removing floating substances floating in the sewage W, and once received by the distribution tank 3 from the receiving tank 2 by the pump PM1, and further from the distribution tank 3 by the pump PM2. An aeration tank 4 for decomposing organic matter with aerobic bacteria and protozoa, a sedimentation tank 5 for receiving biodegraded sewage W ′ and precipitating sludge produced in the treatment process, and the sedimentation tank The final treatment tank 6 that receives the intermediate treated sewage w ”from 5 and performs the pH treatment before the discharge, and the middle with a large excess sludge content sucked and discharged from the bottom of the sedimentation tank 6 by the pump PM3 Receive treated sewage W ”and pump A high-pressure water flow of 5 kg / cm ² or more generated by the pump PM4 is turned into a high-speed swirling flow in the conical chamber, and a shearing force and a compressive force are applied to water and contained organic substances, and it is generated by release into the apparatus tank. It has an ultrafine refiner 10 and an excess sludge fermentation treatment unit 20 that make cavitation and impact force act to at least micronize organic matter to the micron level and return it to the aeration tank 4 through the valve V7 by the pump PM5.

The aeration tank 4 is composed of a pair of elongated circulation pool type oxidation ditches 4A and 4B arranged side by side. Each of the aeration tanks 4 receives a supply of ultrafinely treated sewage from the ultrafine refiner 10, and a settling tank 5 also receives supply of return sludge for repeated biodegradation treatment through the valve V1 by the pump PM3. Each oxidation ditch 13A, 13B is equipped with a stirrer 13C at both ends of the central partition wall for slowly circulating the sewage W and taking in air. In each oxidation ditch 4A, 4B, in addition to oxidation treatment, for example, NO ₃ is converted to N ² by denitrifying bacteria, NH ₄ is converted to NO ³ by nitrifying bacteria, or methanol is used. NO ₃ is converted to N ² to perform denitrification. Moreover, in the sedimentation tank 5, the dead bodies of the bacteria that worked in the aeration tank 4 settle as sludge, and the supernatant water treated with various organic substances flows into the final treatment tank 6. The amount of the precipitated sludge supplied to the ultrafine device 10 and the aeration tank 4 is adjusted by the switching valves V1, V2, V3, and V4. For example, the ratio supplied to the ultrafine device 10 is usually 50% to 75%, and the ratio returned to the aeration tank 4 is 50% to 25%, but can be changed as necessary.

  The final treatment tank 6 has a filtration device 6A for purifying a biofilm, and residual sludge and solid fine particles in the supernatant water from the precipitation tank 5 are filtered before the supernatant water is discharged. Further, in the post-processing unit 6B, in order to clear regulations such as BOD (biological oxygen demand) and COD (chemical oxygen demand) in each region, before the discharge of the supernatant water, a sulfate band is appropriately added. A flocculant and a pH adjusting agent such as alkali are supplied to mix and agglomerate residual sludge and solid fine particles in the supernatant water from the precipitation tank 5, and a polymer flocculant is supplied to further agglomerate. Is done.

  As shown in FIG. 2, the ultrafine device 10 has a residue removing device 7 as a pretreatment device, a stirrer 8A, an alkaline agent injection part 8B, and a regulating tank 8 having a quantitative maintenance float device 8C. The sewage can be removed by the residue removing device 7 and the sewage whose quantitative amount is maintained by the quantitative maintenance float device 8C. Thus, an alkaline agent such as caustic soda can be accurately injected from the alkaline agent injection part 8B, and the cell membrane of sludge can be weakened beforehand by alkali, and the ultrafine refinement effect by the ultrafine refiner 10 can be promoted. The pretreated sewage W ″ is sent from the adjustment tank 8 to the ultrafine device 10 through the valves V5 and V6 and the flow meter 9 by the supply pump PM6. Control panel to which quantitative information from the quantitative maintenance float device 8C is input. CP controls valves V3 and V4, residue removal device 7, stirrer 8A, alkaline agent injection unit 8B, pump PM4 and pump PM6, and achieves the desired ultrafine refinement without causing excess or deficiency of treated sewage Is to be achieved.

The ultrafine device 10 will be described with reference to FIGS. This ultrafine device 10 ultrafinely refines organic matter such as flakes and particulate sludge contained in sewage to a level of several microns and melts it in the water to be treated to promote biodegradation in the aeration tank 4. The high-speed swirling jet is injected into the apparatus tank 10A (FIG. 2) holding the fluid containing the organic matter, and the organic matter in the fluid is made ultrafine by impact force into the fluid. Melt. The ultrafine device 10 has a small-diameter circular shape that is opened at the end faces 11a and 11a of the side casings 11A and 11A of the device body 10B supported by a pair of left and right stands S so as to inject a high-speed swirling jet F3 to the left and right. On the peripheral surface of the central casing 11B provided between the outlets 11b and 11b and the side casings 11A and 11A, a fluid F1 having a pressure of about 7 kg / cm ² from the tangential direction in the large-diameter circular inner cavity portion 12b. It includes a supply port 12c formed so as to be supplied through the supply pipe P and generate a high-speed swirling flow F2 in the internal cavity portion 12b, and a large-diameter circular central internal cavity portion 12b of the central casing 11B. Of inner casings 11A, 11A consisting of circular inner cavity portions 12a, 12a that are tapered in a funnel shape (conical shape) toward outlets 11b, 11b having a small diameter. The cavity chamber 12 has nozzles 13 attached to the end faces 11a and 11a of the side casings 11A and 11A and connected to the outlets 11b. The fluid F1 is generated by the pump PM4 that sucks the sewage W ″ having a large content of surplus sludge, which is the fluid to be treated in the apparatus tank 10A, and is supplied to the supply pipe P.

The apparatus main body 10B has a substantially horizontal columnar shape, and is configured by connecting both side casings 11A and 11A to a ring-shaped central casing 11B with four bolts B at their flanges. Their joint surfaces are each sealed by an O-ring R. The ratio of the large diameter of the inner cavity portion 12b of the central casing 11B to the small diameter of the outlet 11b of the side casings 11A and 11A is set to about 4: 1, for example, and the taper angle, that is, the taper of the side casings 11A and 11A. The angle α is set to 30 degrees, for example. Therefore, when a fluid having a pressure of 5 kg / cm ² or more is supplied from the supply pipe P connected to the supply port 12c from the tangential direction to the large-diameter circular central inner cavity portion 12b of the central casing 12B, the left and right side portions The high-speed swirling flow F2 flows into the tapered frustoconical inner cavities 12a and 12a of the casings 11A and 11A, and the pressure is gradually increased toward the outlets 11b and 11b. The high-speed swirling flow F3 of the jet that has become higher than the supply pressure generates a large-scale cavitation along a longer outflow path due to the spiral action than the normal jet flow with a larger impact force and vibration, thereby removing organic matter. Effectively pulverized and micronized to micron level. However, if bubbles are mixed into the supply pressure fluid F1 using an ejector or the like, if the fermentation fluid and various bacteria are mixed in the pressure fluid in advance, the bubbles become cushions and the survival rate is increased. Good results are also obtained for aerobic bacteria that inhabit the apparatus tank 10A into which the pressurized fluid is injected. The high-speed swirling flow F2 in the inner cavity chamber 12 generates a high-speed swirling jet F3 that generates strong cavitation in the fluid in the tank, and generates a negative pressure at the center thereof to generate a back-flow backflow from the outlet 11b. Therefore, vibration effective for miniaturization also occurs due to local interference with the jet flow.

  In this example, the nozzles 13 and 13 are further attached to the end faces 11a and 11a of the side casings 11A and 11A by two bolts b, respectively. Each nozzle 13 includes four nozzle disks 13A, 13B, 13C, and 13D, and interval disks 14A, 14B, 14C, 14D, and 14E that are stacked with these nozzle disks interposed therebetween. The nozzle disks 13A, 13B, 13C, and 13D have circular holes 13a, 13b, 13c, and 13d with edges that gradually increase in diameter from the outlet 11b side toward the outside, and the center line of the circular holes is It is aligned with the center line of the outlet 11b. The interval disks 14A, 14B, 14C, 14D, and 14E have large holes 14a, 14b, 14c, 14d, and 14e that do not cover the circular holes 13a, 13b, 13c, and 13d. Accordingly, the high-speed swirling flow F3 ejected from the outlet 11b and gradually expanding partially exits the nozzle 11 due to repeated suction backflow due to the negative pressure at the center at the circular holes 13a, 13b, 13c, and 13d. The plates 13A, 13B, and 13C can be vibrated at high frequency to further generate cavitation by ultrasonic vibration, and the mechanical destruction action by the sharp edge of each circular hole that is ultrasonically vibrated can be utilized for ultrafineness. . In that case, when the organic material to be processed is mixed with the pressure fluid F1 to be supplied, it is particularly effective for the ultrafine processing, and the ultrafine processing is performed down to the level of several microns. Further, even if the edge of the circular hole is eroded by cavitation, the sharp rough surface formed one after another exhibits the same effect as the edge. When each nozzle disk 13A, 13B, 13C, 13D resonates and emits a high sound, the center of the circular holes 13a, 13b, 13c, 13d of each nozzle disk is slightly shifted from each other to prevent the resonance sound from interfering. You can also. It goes without saying that an ultra-miniaturization apparatus that omits the nozzle 13 can also be used for ultra-miniaturization.

  As shown in FIG. 7, the inner cavity portion 11a ′ of each side casing 11A ′ can be formed in a circular shape (in a longitudinal section) in a dome shape in addition to the conical shape, and in this case, the outlet The pressure of the high-speed swirling flow suddenly increases toward 11b, a stronger high-speed swirling flow can be ejected, and stronger cavitation can be applied to the organic matter in the fluid.

As shown in FIG. 8, in the apparatus tank 10A holding the fluid to be processed W ″, a plurality of, for example, three sets of the apparatus 10 are provided from the pressure fluid supply main pipe AP according to the amount of the fluid to be processed W ″. The three branch pipes BP are connected to each other through each supply port, so that a large amount of organic matter of the fluid W ″ to be processed can be made ultrafine in a short time.
In addition to the representative example, one provided with one side casing having one outlet for jetting a high-speed swirling flow from only one side is also used as appropriate.

As one embodiment (example for testing) of the ultrafine device 10, the inner cavity portion 12b of the central casing 11B is configured with a diameter of 70 mm and a depth of 45 mm, and the inner cavity portion of the truncated cone shape of the side casing 11A. 12a is configured with a depth of 97 mm with a taper angle of 30 degrees from a large diameter of 70 mm to a small diameter of 18 mm of the outlet 11b. The nozzle 13 includes a circular hole having a diameter of 18 mm and an interval disk 14A having a thickness of 3 mm, which are sequentially arranged from the outlet side toward the outside, and a vibration having a circular hole having a diameter of 6 mm and a thickness of 0.5 mm. Nozzle disk 13A, a circular hole having a diameter of 30 mm, a spacing disk 14B having a thickness of 5 mm, a circular nozzle having a diameter of 7 mm, a vibrating nozzle disk 13B having a thickness of 0.5 mm, and a diameter of 20 mm An interval disk 14C having a circular hole and a thickness of 7 mm, a circular hole having a diameter of 8 mm, a vibrating nozzle disk 13C having a thickness of 0.5 mm, a circular hole having a diameter of 35 mm and a thickness of 9 mm. A disc 9D having a diameter of 9 mm, a vibrating nozzle disc 13D having a thickness of 0.5 mm, a disc having a diameter of 20 mm, and a spacing disc 14E having a thickness of 3 mm. It is configured. When a supply pressure fluid of 7 kg / cm ² was supplied, it was confirmed by microscopic observation that about 30% of organic substances were ultrafinened to 1 to 6 microns.

  In the surplus sludge fermentation treatment unit 20, a part of the intermediate treated sewage W ″ having a large surplus sludge content from the bottom of the settling tank 5 is supplied to the sludge concentration tank 21 by the control of the valves V3, V8 and V9. The supernatant water of the concentration tank 21 is returned to the distribution tank 3 through the drainage tank 22 and the concentrated sludge from the bottom of the sludge concentration tank 21 is sent to the sludge fermentation and decomposition apparatus 30 through the sludge storage tank 23.

  The sludge fermentation and decomposition apparatus 30 has been already filed by the inventor of the present application and will be described briefly. A sludge extinguishing unit that receives supply of sludge from the sludge concentration tank 21 and mixes it with the aerobic fungus bed and biodegrades it. And a fermentation tank comprising a mixing tank for mixing the sludge from the sludge concentration tank 21 and the fermentation bacteria from the fermentation bacteria supply section, and a fermentation tank for fermenting the mixture supplied from the mixing tank. Yes. From the fermentation section, agricultural materials that can be diverted to compost and soil improvement are obtained. On the other hand, the sludge extinguishing part that extinguishes the sludge is kept in the pool, the fungus bed of wood chips inhabited by aerobic bacteria, and the air pipe that is fed from the air blower and piped to the bottom of the fungus bed And a stirrer that stirs the wood chip of the fungus bed and the supplied sludge while moving back and forth, and a scattered matter collecting device. The scattered matter recovery apparatus includes a cooling unit that is supplied with water vapor or the like generated from the apparatus by a suction fan to condense into condensed water, a deodorizing unit that deodorizes exhaust gas, and a condensate tank. Condensate is used as factory miscellaneous water. In addition to the pool type, sludge that stirs and mixes the sludge with the bed of wood chips inhabited by aerobic bacteria in the rotating drum sold by the inventor under the trade name Bactron and eliminates the sludge The extinguisher is also adopted.

  The fermenting bacteria supply unit receives the supply of water from an inoculum tank containing fermenting bacterial species such as Lactobacillus, an additive tank containing an additive containing molasses and minerals, and the same operation as described above A large amount of fermenting bacteria by supplying a micronization device that also acts on water, fermenting bacterial species from the seed tank, additives from the additive tank, and water subjected to ultrafine action from the water tank. And a fermenter culture tank for cultivating the cells, and a distribution tank for promoting fermentation and incorporating a distribution pump. When photosynthetic bacteria that coexist with fermentative bacteria are added to the fermentation bacteria culture tank and distribution tank, the photosynthetic bacteria are rich in amino acids, minerals, vitamins, and other excellent nutrients, and the cells themselves are also useful as organic fertilizers. In addition to supplying necessary substances to each other, the culture is accelerated, and a malodorous substance generated by spoilage bacteria is ingested as a nutrient source, so that it is possible to further reliably prevent spoilage. Further, the fermenting bacteria culture tank and the distribution tank are provided with stirring means inside, so that the additives and organic substances can be more uniformly dispersed in the water subjected to the ultrafine action. Furthermore, the fermentation accelerating tank includes an agitation means and a temperature control means, so that the organic matter can be evenly dispersed in the water subjected to the ultrafine action, and the culture rate can be increased at a temperature suitable for the fermentation bacteria. As fermentative bacteria, Lactobacillus bacteria, lactic acid bacteria, yeasts, butyric acid bacteria, natto bacteria, etc. collected in the field are generally added, and photosynthetic bacteria taking a symbiotic relationship are also added.

Explanatory drawing which shows the processing flow of the sludge volume reduction equipment which concerns on this invention. Detailed explanatory drawing of the II part in FIG. The longitudinal cross-sectional view of the ultrafine-fabrication apparatus of a typical example. The end view of the ultra-miniaturization apparatus. Sectional drawing along the VV line in FIG. The longitudinal cross-sectional view of the nozzle of the same ultrafine apparatus. The longitudinal cross-sectional view of the structural member which showed the modification of the taper internal cavity part of a super miniaturization apparatus. The top view which showed arrangement | positioning in the apparatus tank of a some ultrafine-fabrication apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sludge volume reduction equipment 2 Receiving tank 2A Floating substance removal apparatus 3 Distributing tank 4 Aeration tank 4A, 4B Oxidation ditch 5 Precipitation tank 6 Final treatment tank 7 Debris removal apparatus 8 Adjustment tank 8A Stirrer 8B Alkaline agent injection part 8C Fixed amount maintenance float device 10 Ultra-miniaturization device 10A Device tank 10B Main body (casing)
11A Side casing 11B Central casing 11a End face 11b Outlet 12 Internal cavity chamber 12a Side tapered internal cavity 12b Central internal cavity 13 Nozzle 13A to 13D Nozzle disk 13a to 13d Circular hole 14A to edge of nozzle disk 14D Spacing disk 14a-14d Spacing disk hole 20 Excess sludge fermentation treatment unit 21 Sludge concentration tank 22 Drainage tank 23 Sludge storage tank 30 Sludge fermentation decomposition apparatus F1 Supply pressure fluid F2 High-speed swirling flow F3 in the internal cavity chamber High-speed swirling flow PM3 Pump W Sewage W 'Intermediate treated sewage W "Intermediate treated sewage w with high sludge content"

Claims (2)

Receiving tank 2 that receives supply of sewage containing organic matter such as septic tank sludge,
An aeration tank 4 which receives supply of sewage from the receiving tank 2 via the distribution tank 3 and decomposes organic matter with aerobic bacteria and protozoa;
A settling tank 5 for receiving the decomposed sewage and precipitating sludge produced in the treatment process;
A final treatment tank 6 that receives intermediate treated sewage of supernatant water from the settling tank and performs pH treatment and the like before discharge;
In the sludge volume reducing equipment having an ultrafine refiner 10 that receives intermediate treated sewage with a large sludge content from the bottom of the settling tank 5 and at least refines organic matter and returns it to the aeration tank. ,
The aeration tank 4 is composed of at least a pair of oxidation ditches 4A and 4B. In addition to receiving the supply of sewage that has been subjected to ultrafine refinement from the ultrafine refiner, the aeration tank 4 is also pumped from the sedimentation tank. Received return sludge supply,
A portion of the intermediate treated sewage having a large amount of sludge from the bottom of the settling tank 5 is supplied to the sludge concentration tank 21 by valve control, and the supernatant water of the sludge concentration tank passes through the drain tank 22 to the distribution tank 3. Condensed sludge from the bottom of the sludge concentration tank 22 is sent to the sludge fermentation and decomposition apparatus 30 via the sludge storage tank 23,
The ultrafine device 10 is a device that injects a high-speed swirling jet F3 into a device tank holding a fluid containing organic matter, and makes the organic matter in the fluid ultrafine by an impact force and melts it in the fluid. And
A small-diameter outlet 11b that is opened in the peripheral surface of the main body of the apparatus and injects the high-speed swirling jet, and tapers from the large-diameter cavity portion 12b inside the main body of the apparatus toward the small-diameter outlet 11b. A conical inner cavity chamber 12 having at least a partially circular portion;
In order to generate a high-speed swirling flow F2 in the conical inner cavity chamber by supplying a fluid F1 having a pressure of 5 kg / cm ² or more from the tangential direction to the inner cavity chamber 12 in the circular portion thereof , the peripheral surface of the apparatus body A high-pressure water flow F1 of 5 kg / cm ² or more generated by the pump is converted into a high-speed swirling flow F2 in the conical cavity chamber, and shearing force and compressive force are applied to the water and the contained organic matter. The sludge volume reduction equipment is characterized in that it is made ultrafine to the micron level by acting cavitation generated by release into the equipment tank . The ultrafine device 10 includes a residue removing device 7 as a pretreatment device, and an adjusting tank 8 having a stirrer 8A, an alkaline agent injection unit 8B, and a quantitative maintenance float device 8C. The equipment described.

Images