JP6141656B2 - Nanomist recovery device and nanomist recovery method - Google Patents

Description

  The present invention relates to a nanomist collecting apparatus and a nanomist collecting method.

  In sewage treatment facilities, factory wastewater treatment facilities, garbage treatment plants and industrial waste treatment facilities, sulfur compounds containing hydrogen sulfide, methyl mercaptan, methyl sulfide and methyl disulfide, and nitrogen compounds containing ammonia and trimethylamine are used. Odor components (bad odor substances) are generated. If these odor components leak into the vicinity of the facility, they cause odor pollution.

  Therefore, each facility takes various measures to remove odor components from the exhaust gas. Such countermeasures include, for example, a deodorization treatment by an activated carbon adsorption method, a biological deodorization method, and a chemical solution cleaning method. However, the deodorizing treatment by these methods has room for improvement in terms of running cost and maintenance.

  In recent years, a technique for deodorizing by adsorbing an odor component in a gas to a mist has been proposed (see, for example, Patent Document 1). The nanomist recovery apparatus described in Patent Document 1 atomizes water containing a surfactant into a mist to adsorb an odor component, and deodorizes the mist by recovering the mist using static electricity, cooling, and a cyclone. According to such a nano mist collection apparatus, the odor component contained in the odor gas can be efficiently and quickly absorbed into the mist and deodorized.

  In addition, an air purification system using a scrubber for recovering a mist component contained in a gas has been proposed (see, for example, Patent Document 2). According to the air purification system described in Patent Document 2, an unnecessary mist component can be removed using a scrubber.

JP 2010-234335 A JP 2005-205094 A

  Here, in the method for recovering mist using static electricity as described in Patent Document 1, ozone is generated as a by-product of recovery in principle, and thus further measures against ozone odor are required. In addition, in order to recover the mist by cooling, the apparatus scale is large, and it takes time for the recovery, and there is room for improvement in the recovery efficiency. Furthermore, a system using a scrubber as described in Patent Document 2 is large in scale and has room for downsizing.

  Therefore, the objective of this invention made | formed in view of this situation is providing the compact nano mist collection | recovery apparatus and nano mist collection | recovery method which can collect | recover nano mist rapidly and efficiently, without producing a by-product.

  In order to achieve the above-mentioned object, the present inventors conducted intensive research and mixed the recovered water and nanomist in an apparatus configuration for recovering nanomist adsorbing odor components, and then collected the mist with a cyclone. Focusing on the fact that the nano mist adsorbing the odor component can be collected quickly and efficiently without generating a by-product by collecting, the present invention has been completed.

That is, the present invention aims to advantageously solve the above-mentioned problems, and the nanomist recovery device of the present invention includes at least a nanomist adsorbing an odor component and a nanomist inlet for introducing gas and a supply of recovered water. A recovery water inlet for introducing recovered water for recovering the nanomist through a section, and shearing the nanomist introduced from the nanomist inlet and the recovered water introduced from the recovered water inlet It comprises a nano mist-recovered water contact portion that is contacted and mixed by action, and a recovery portion that recovers mist from the nano mist-recovered water contact portion with a cyclone. In this way, nanomist that has adsorbed odorous components is brought into contact with and mixed with recovered water, and further recovered with a cyclone, so that nanomist is recovered quickly and efficiently with a compact device configuration without generating by-products. be able to.

  Moreover, in the nano mist collection | recovery apparatus which concerns on this invention, it is preferable that the nano mist before adsorb | sucking an odor component and the said collection | recovery water are pH 5.8 or more and pH 8.6 or less. By using neutral water having a pH of 5.8 or more and a pH of 8.6, a deodorizing effect by nanomist can be achieved with a simple configuration.

Further, in Nanomisuto recovery apparatus according to the present invention, the Nanomisuto recovery device further comprises a sensor for measuring the pH of the waste water discharged from the Nanomisuto recovery apparatus, the recovered water supply unit further by the sensor It is preferable to provide a recovered water supply amount adjuster that adjusts the supply amount of the recovered water based on the measured pH value. By setting it as such a structure, it becomes possible to control so that pH of the waste_water | drain discharged | emitted from a nanomist collection | recovery apparatus may become an appropriate value.

In order to achieve the above object, the nanomist recovery method of the present invention is a method for recovering nanomist that has adsorbed odor components, at least a step of introducing nanomist and gas that have adsorbed odor components, and for recovering the nanomist A step of introducing the recovered water, a contact mixing step of contacting and mixing the nanomist and the recovered water by a shearing action, and a step of recovering the mist having undergone the contact mixing step with a cyclone. To do. By such a method, nanomist can be recovered quickly and efficiently without generating a byproduct.

  In the nanomist recovery method according to the present invention, it is preferable that the nanomist before adsorbing the odor component and the recovered water have a pH of 5.8 or more and a pH of 8.6 or less. By such a method, the deodorizing effect by nanomist can be achieved easily.

  The nanomist recovery method according to the present invention further includes a measurement step of measuring the pH of the wastewater after the recovery step, and the recovered water that adjusts the amount of the recovered water introduced based on the pH measurement value in the measurement step It is preferable to further include a supply amount adjusting step. By such a method, it becomes possible to control the pH of the waste water discharged from the nano mist recovery device to be an appropriate value.

  According to the present invention, it is possible to recover nanomist quickly and efficiently without generating a byproduct.

It is a schematic block diagram of the deodorizing equipment which attached the nano mist collection | recovery apparatus by one Embodiment of this invention. It is a figure for demonstrating an example of a structure of the nano mist-recovered water contact part of the nano mist collection | recovery apparatus shown in FIG. It is a figure for demonstrating another example of a structure of the nano mist-recovered water contact part of the nano mist collection | recovery apparatus shown in FIG.

  Hereinafter, an embodiment of a nano mist recovery device according to the present invention will be described in detail with reference to the drawings. The nanomist recovery apparatus of the present invention is used for recovering nanomist that has adsorbed odorous components contained in odorous gas generated in a sewage treatment plant, a garbage disposal plant, and the like. In addition, the nano mist collection | recovery method by this invention becomes clear from description of the nano mist collection | recovery method by embodiment of this invention.

  A nanomist recovery apparatus according to an embodiment of the present invention includes a nanomist introduction port that introduces nanomist that has adsorbed at least an odor component, and a recovery water introduction port that introduces recovery water for recovering nanomist. It is characterized by comprising a nano mist-recovered water contact part for contacting and mixing recovered water, and a recovery part for recovering mist from the nano mist-recovered water contact part with a cyclone.

  FIG. 1 is a schematic configuration diagram of a deodorization facility provided with a nano mist recovery device according to an embodiment of the present invention. The nanomist recovery device 1 includes a nanomist-recovered water contact unit 2 and a recovery unit 3. The nanomist-recovered water contact portion 2 includes a nanomist inlet 4 into which nanomist having adsorbed odor components is introduced, and a recovered water inlet 5 into which recovered water is introduced. The collection unit 3 collects the mist that has passed through the nanomist-recovered water contact unit 2 with a cyclone. The recovery unit 3 includes a cyclone chamber 6 that separates mist from odor gas by centrifugal force, and a recovery mist storage tank 9 that recovers and stores the mist separated in the cyclone chamber 6. Furthermore, it is preferable that the nano mist-recovered water contact portion 2 includes a right-handed mixing element 22 and a left-handed mixing element 30 whose configurations are described with reference to FIGS. 2 and 3.

  2 and 3 are perspective views of a 90 ° rotating mixing element. The mixing elements 22 and 30 have cylindrical pipes 23 and 31, respectively, and spiral blade bodies 24, 25 and 32, 33 provided in the pipes 23 and 31, respectively. The blades 24, 25 and 32, 33 are twisted by 90 ° between the end portions in the clockwise direction (right rotation) and counterclockwise (left rotation). A plurality of passages 26 and 27 and passages 34 and 35 are formed, and the insides of the tubes 23 and 31 are defined. The passages 26 and 27 and the passages 34 and 35 communicate with each other over the entire lengths of the pipes 23 and 31 through the gaps between the blade bodies 24, 25, 32, and 33, and communicate with the openings 28 and 36, respectively. . Further, the blade bodies 24, 25 and 32, 33 have holes 29 and 37.

  The nanomist collection apparatus 1 exhibits its function by being used in association with a mechanism for adsorbing odor components to the nanomist. Hereinafter, while describing each component which comprises the mechanism for making the nanomist adsorb | suck the odor component contained in odor gas, an example of operation | movement of the nanomist collection | recovery apparatus 1 which concerns on this embodiment is demonstrated.

  The water tank 11 stores water. The water stored in the water tank 11 is supplied as atomization water to the atomization unit 15 and as recovered water to the nanomist-recovered water contact unit 2. The water tank 11 can store neutral water having a pH at 20 ° C. of 5.8 to 8.6. The pH of the neutral water is preferably pH 6.5 or higher. The pH of the nano mist before adsorbing the odor component derived from such neutral water is neutral.

The atomization part 15 atomizes water by electrostatic atomization or ultrasonic atomization, and produces | generates nanomist. In this example, the atomization unit 15 will be described as performing electrostatic atomization. In this case, the atomization unit 15 includes a plus electrode 13 and a minus electrode 14, and is sent from the water tank 11 to the circulation storage tank 17 by the pump (P) 16 and is sent from the circulation storage tank 17 by the pump 18. The water is electrostatic atomized. The atomizing unit 15 includes a power source (not shown in FIG. 1) for applying a high voltage between the positive electrode 13 and the negative electrode 14 for discharging. The atomization part 15 produces | generates a nano-order mist (nanomist) by making the atomization water supplied from the plus electrode 13 side generate a Rayleigh split, and making it atomize. In the present specification, nano-order refers to a particle diameter of less than 1 μm, particularly 100 nm or less. Generally, the particle diameter of nanomist generated by electrostatic atomization is 10 nm or more and 30 nm or less, or 20 nm or more and 30 nm or less. Moreover, the particle diameter of the nanomist produced | generated by ultrasonic atomization is 100 nm or less, and the mist of the particle diameter of 100 nm vicinity occupies most of the nanomist produced | generated by ultrasonic atomization. In addition, when the atomization part 15 implements ultrasonic atomization, the atomization part 15 is not provided with the plus electrode 13 and the minus electrode 14, but the water tank (not shown) in which the ultrasonic vibrator entered the water for atomization. It is arranged and arranged inside. At this time, favorable atomization efficiency can be achieved by setting the distance from the ultrasonic transducer surface to the water surface to be 30 mm to 40 mm. Nanomist is considered to have an action of oxidatively decomposing odor components by active species such as radicals (OH ⁻ ) and adsorbing odor components by surface tension.

  The mixing unit 19 mixes the nano mist generated by the atomizing unit 15 with the odor gas (original odor) to be deodorized introduced from the outside, for example, the outside of the nano mist collecting device 1, so that the mist gas in the odor gas is mixed. The odor component is adsorbed, and the nano mist is conveyed with the adsorbed odor gas. The mixing unit 19 may be configured so that the nanomist can freely diffuse, and does not need to have a configuration such as a stirring member for promoting contact between the nanomist and the odor gas. The mixing unit 19 may include, for example, a plurality of plate-like members configured to obstruct the odor gas and nanomist flow paths. With such a plate-like member, the moving distance of the odor gas and nano mist can be increased. The nanomist that has become water droplets in this movement process and the atomization water that has not been converted to nanomist by the atomization unit 15 reach the circulating storage tank 17 through the cylindrical inner wall of the nanomist deodorizing tower 20 and the mixing unit 19 and are stored.

  While moving in the mixing unit 19, the nano mist and the odor gas are mixed, and the odor component in the odor gas is adsorbed by the nano mist. Here, the odor component contained in the odor gas generated by the sewage treatment is mainly a sulfur compound containing hydrogen sulfide, methyl mercaptan, methyl sulfide, and methyl disulfide, and a nitrogen compound containing ammonia and trimethylamine.

  The nanomist introduction port 4 introduces the nanomist and odor gas that have adsorbed the odorous component and have passed through the mixing unit 19 into the nanomist-recovered water contact unit 2. When 100% of the odor component in the odor gas is adsorbed to the nano mist in the mixing unit 19, the nano mist inlet 4 introduces the nano mist that adsorbs the gas and the odor component (not including the odor). become.

  The recovered water introduction port 5 introduces the recovered water sent from the acidic electrolyzed water storage tank 12 </ b> A by the pump 21 into the nanomist / recovered water contact unit 2 via the recovered water supply amount regulator 41 and the recovered water supply unit 40. . The nanomist and odor gas that have adsorbed the odor component introduced through the nanomist inlet 4 come into contact with the recovered water introduced through the recovered water inlet 5. Preferably, the recovered water introduction port 5 is provided with a member capable of dropping a liquid such as a shower nozzle in the form of water droplets, for example, and the recovered water to be introduced is formed into water droplets, and the recovered water is introduced by showering. it can. In this way, by introducing water droplet-like recovered water at the recovered water introduction port 5, it becomes possible to increase the contact area with the nanomist that adsorbs the odor component, and the nanomist is efficiently put into the recovered water droplets. It can be absorbed.

  As described above, the nanomist-recovered water contact portion 2 preferably includes the right-handed mixing element 22 and the left-handed mixing element 30. The nanomist and odor gas that have adsorbed the odor components introduced through the nanomist inlet 4 co-flow with the recovered water introduced from the recovered water inlet 5, and the blade bodies 24, 25 and 32, 33, holes 29 and 37. While flowing, they are brought into contact and mixed (contact mixing) by shearing action of division, merging, horizontal and vertical directions. In this way, by bringing the odor gas, nanomist, and recovered water into contact with each other at the nanomist-recovered water contact portion 2, the efficiency of nanomist absorption by recovered water is improved, and not only the collision frequency between nanomists increases. Moreover, it can also promote that the odor component in odor gas adsorb | sucks to nanomist.

  The nanomist-recovered water contact unit 2 can adjust parameters such as the contact mixing time of recovered water and nanomist, the flow rate of nanomist, and the volume ratio of recovered water to nanomist. These parameters can be adjusted as appropriate in order to optimize the contact efficiency between the recovered water and the nanomist.

  The recovered water that has absorbed the nano mist accumulates in the lower part of the nano mist-recovered water contact portion 2 and becomes drainage. The nano mist-recovered water contact unit 2 communicates with the nano mist deodorization tower 20 at the lower part, and the waste water accumulated at the lower part of the nano mist-recovered water contact part 2 is supplied to a recovery mist storage tank 9 provided at the lower part of the nano mist deodorization tower 20 Inflow. And the waste_water | drain accumulated in the collection | recovery mist storage tank 9 is discharge | released with the pump 10 at arbitrary timings. Preferably, the nanomist collecting apparatus 1 includes a sensor 12 that measures the pH of the wastewater discharged from the nanomist collecting apparatus 1, and the collected water supply unit 40 further collects based on the measured value of the pH of the wastewater by the sensor 12. A recovered water supply amount adjuster 41 that adjusts the supply amount of recovered water from the water supply unit 40 is provided. By setting it as such a structure, when the pH of the waste_water | drain by the sensor 12 does not satisfy | fill an environmental standard, it becomes possible to increase the quantity of recovered water and to control so that the pH of waste_water | drain becomes an appropriate value. Become. The nano mist recovery device 1 further includes a pH adjustment chemical addition unit (not shown), and adjusts the pH of the waste water by adding the chemical to the recovery mist storage tank 9 based on the measured value of the pH of the waste water by the sensor 12. It is also possible to do. With this configuration, the pH of the waste water can be finely adjusted.

  On the other hand, the mist that is not adsorbed by the acidic electrolyzed water at the nano mist-recovered water contact portion 2 and is still in the mist state is sent to the cyclone chamber 6 of the recovery portion 3. The cyclone chamber 6 separates the mist introduced from the nano mist / recovered water contact portion 2 by the cyclone effect and brings it into a water droplet state. The recovered mist storage tank 9 is separated to be in a water droplet state, and stores water droplets flowing down the inner wall of the nanomist deodorizing tower 20. Here, the present inventors contact the nano mist-recovered water contact section 2 and mix them, so that the nano mist particles collide with each other and contact with the water droplets of the recovered water, so that they are sent to the recovery section 3. It was noted that the particle size of the mist is assumed to be larger than the time immediately after being generated by the atomizing unit 15 at the time when the mist is generated.

  Conventionally, cyclones are not suitable for collecting nano-order mist, and it has been considered that the collection efficiency is extremely poor. However, it is assumed that the mist that has passed through the nano mist-recovered water contact portion 2 is no longer in the nano order but has grown in the micro order. Micro-order mist can be efficiently recovered even with a cyclone system. Therefore, the present inventors have a configuration in which the mist grown from the nano-order to the micro-order in the nano-mist-recovered water contact unit 2 is recovered in the cyclone chamber 6 of the recovery unit 3 by the cyclone in the nano-mist recovery device according to the present embodiment. It came.

  As described above, the nanomist recovery apparatus 1 according to the present embodiment is configured so that the mist that cannot be recovered due to the collision between the nanomists in the nanomist-recovered water contact portion 2 and the contact between the nanomist and the recovered water is generated by the cyclone effect in the cyclone chamber 6. The mist is recovered by adhering to the wall surface of the deodorization tower 20 and flowing down. For this reason, the nano mist collection device 1 according to the present embodiment can dramatically improve the collection efficiency of the nano mist having adsorbed odor components with a compact device configuration. Furthermore, since the nano mist collection | recovery apparatus 1 by this embodiment does not utilize an electrostatic system at the time of collection | recovery, there is no possibility of producing by-products, such as ozone, and a by-product countermeasure is unnecessary.

  Then, the blower (B) 8 releases the odor gas that has passed through the recovery unit 3 into the atmosphere. At this point, the odor component in the odor gas is greatly reduced compared to the original odor, and even if released into the atmosphere, there is little risk of causing bad odor pollution.

  As mentioned above, although the example of the nano mist collection | recovery apparatus and nano mist collection | recovery method by one Embodiment of this invention was demonstrated, the nano mist collection | recovery apparatus and nano mist collection | recovery method of this invention are not limited to the said example, It adds suitably. Can do. Specifically, in the first embodiment, the nano mist / recovered water contact portion 2 is described as being configured by a mixing element. However, by providing an ejector instead of the mixing element, the nano mist / recovered water contact portion is provided. Of course, it is also possible to configure 2. In this case, the nano mist-recovered water contact unit 2 causes the recovered water introduced from the recovered water inlet 5 and the nano mist introduced from the nano mist inlet 4 to contact and mix in the ejector, so that the nano mist becomes recovered water. Can be included.

Moreover, in the said embodiment, it is also possible to comprise the water tank 11 as an electrolyzed water production | generation part. When the water tank 11 is an electrolyzed water generation part, the water tank 11 electrolyzes water, produces | generates electrolyzed water, and has an acidic electrolyzed water storage tank and an alkaline electrolyzed water storage tank inside, respectively, acidic electrolyzed water and alkaline Store electrolyzed water. Further, in this case, the water tank 11 includes an electrolytic tank for electrolyzing water and a power source for applying a voltage to the electrode of the electrolytic tank. For example, the aquarium 11 can generate electrolytic water by decomposing tap water, groundwater, rainwater, and secondary treated water. The water tank 11 has a high hydrogen ion (H ⁺ ) concentration in the acidic electrolyzed water and a high hydroxide ion (OH ⁻ ) concentration in the alkaline electrolyzed water, thereby adjusting the pH at 20 ° C. and pH 0 for the acidic electrolyzed water. The pH is 5.8 or less, and the alkaline electrolyzed water can be pH 8.6 or more and pH 14 or less.

  When the atomization water is alkaline electrolyzed water, the recovered water inlet 5 of the nanomist-recovered water contact unit 2 uses the electrolyzed water sent from the acidic electrolyzed water storage tank of the water tank 11 by the pump 21 to the nanomist-recovered water. It introduces into the contact part 2. And in the nano mist-recovered water contact part 2, the waste water becomes neutral by the nano mist produced | generated from alkaline electrolyzed water and the acidic electrolyzed water which is recovered water being contacted and mixed. Furthermore, when the control device 42 determines that the pH of the wastewater measured by the sensor 12 exceeds the appropriate range, the control device 42 controls the operation of the recovered water supply amount adjuster 41 to adversely affect the deodorizing effect. In such a range that does not occur, the supply amount of recovered water can be increased or decreased to maintain the pH of the drainage within an appropriate range.

  In the nanomist collecting apparatus having such a configuration, by using alkaline electrolyzed water as the atomizing water, the adsorption efficiency of the odor component to the nanomist per unit amount is improved as compared with the case where the neutral water is used as the atomizing water. . This is because the sulfur compounds containing hydrogen sulfide, methyl mercaptan, methyl sulfide, methyl disulfide, and nitrogen compounds containing ammonia and trimethylamine, which are included in the odor component, are acidic per se. This is because the adsorptivity is high. Because the adsorption efficiency of odorous components to nano mist per unit amount is high, the amount of water used (total amount of acidic electrolyzed water and alkaline electrolyzed water) is reduced compared to the case of using neutral water for atomizing water and recovered water can do. In particular, when alkaline electrolyzed water is used as the atomizing water and acidic electrolyzed water is used as the recovered water, the nanomist is easily taken into the recovered water. Therefore, when the gas-liquid contact time in the nanomist-recovered water contact portion 2 is the same as that when neutral water is used for the atomizing water and the recovered water, the nanomist can be sufficiently dissolved with a small amount of recovered water. Therefore, the amount of recovered water can be reduced. Furthermore, since a sufficient deodorizing effect can be achieved even with a small amount of recovered water, the nanomist recovery device can be further miniaturized.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to the following Example at all.

  Using the nano mist recovery apparatus shown in FIG. 1, odor gas containing malodorous components generated by sewage treatment was deodorized. Supply atomization amount (g / min) supplied by the atomization unit, volume ratio of recovered water to nanomist in the nanomist-recovered water contact unit, flow rate of nanomist (m / s), and contact mixing in the nanomist-recovered water contact unit The time (seconds) was set to the value shown in Table 1, and the removal effect was evaluated. In addition, the mixing element with which the used nano mist collection | recovery apparatus is equipped is comprised by the mu company limited by Mu Company Limited (pipe inner diameter 40mm, MS-40 V-101). The removal effect was evaluated by comparing the odor level of the odor gas (original odor) with the odor level of the gas immediately after being discharged from the nanomist-recovered water contact portion. The odor level was measured with a odor sensor manufactured by Shin Cosmos Electric Co., Ltd.

  When the treatment was performed under the conditions shown in Table 1, the removal performance was 75% or more, and good results were obtained.

  According to the nanomist recovery apparatus and the nanomist recovery method of the present invention, nanomist can be recovered quickly and efficiently with a compact configuration without generating by-products.

DESCRIPTION OF SYMBOLS 1 Nano mist collection apparatus 2 Nano mist-recovered water contact part 3 Recovery part 4 Nano mist inlet 5 Recovered water inlet 6 Cyclone chamber 12 Sensor 40 Recovered water supply part 41 Recovered water supply amount adjustment machine

Claims (6)

At least a nano mist adsorbing odor components and a nano mist introduction port for introducing gas and a recovered water introduction port for introducing recovered water for recovering the nano mist through a recovered water supply unit are introduced from the nano mist introduction port. A nanomist-recovered water contact portion for contacting and mixing the nanomist and the recovered water introduced from the recovered water introduction port by a shearing action ;
The nano mist collection | recovery apparatus provided with the collection | recovery part which collect | recovers the mist from the said nano mist-recovery water contact part with a cyclone.   The nanomist recovery apparatus according to claim 1, wherein the nanomist and the recovered water before adsorbing the odor component have a pH of 5.8 or more and a pH of 8.6 or less. The nano mist recovery device further includes a sensor for measuring the pH of waste water discharged from the nano mist recovery device,
The recovered water supply unit further includes a recovered water supply amount adjuster that adjusts the supply amount of the recovered water based on a pH measurement value by the sensor.
The nano mist collection device according to claim 1 or 2, wherein A method for collecting nano mist that has adsorbed odor components,
At least a step of introducing nanomist and gas adsorbing odor components;
Introducing recovered water for recovering the nanomist;
A contact mixing step of contacting and mixing the nanomist and the recovered water by a shearing action ;
And a recovery step of recovering the mist that has undergone the contact mixing step with a cyclone.   The nanomist recovery method according to claim 4, wherein the nanomist before adsorbing the odor component and the recovered water have a pH of 5.8 or more and a pH of 8.6 or less. A measurement step of measuring the pH of the waste water after the recovery step;
A recovered water supply amount adjusting step of adjusting an amount of the recovered water introduced based on a pH value measured by the measuring step;
The nanomist collection method according to claim 4 or 5, characterized in that.

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