JP2007245118A - Exhaust gas treating method and exhaust gas treating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust gas treating method and an exhaust gas treating system by which energy saving and high treatment efficiency can be attained. <P>SOLUTION: The exhaust gas treating system has a pretreatment apparatus 37 and an exhaust gas treatment apparatus 3 in a latter step. Since the exhaust gas is pretreated by washing water containing micro nanometer bubbles in the pretreatment apparatus 37, even when concentration of the exhaust gas introduced into the pretreatment apparatus 37 varies, exhaust gas treatment by the washing water containing the micro nanometer bubbles in the exhaust gas treatment apparatus 3 can be stabilized and thereby a removing ratio of exhaust gas components in the exhaust gas can be stabilized and improved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an exhaust gas treatment method and an exhaust gas treatment system, and as an example, relates to an exhaust gas treatment method and an exhaust gas treatment system capable of coping with exhaust gas in which waste water is not generated and the exhaust gas concentration at the entrance changes.

  From the viewpoint of air pollution, volatile organic compounds in exhaust gas need to be treated. In particular, volatile organic compounds in exhaust gas need to be treated reliably, but conventionally, combustion methods that waste energy have been common.

This combustion method is not an exhaust gas treatment method suitable for an era when the environment is important because energy is wasted and the running cost is high in an era where energy saving is important.
JP 2004-121962 A JP 2003-334548 A JP 2004-321959 A

  Accordingly, an object of the present invention is to provide an exhaust gas treatment method and an exhaust gas treatment system with energy saving and high processing efficiency.

In order to solve the above problems, the exhaust gas treatment method of the present invention includes a step of pretreating exhaust gas with washing water containing micro-nano bubbles in a pretreatment device,
A step of introducing the pretreated exhaust gas into an exhaust gas treatment apparatus and treating it with washing water containing micro-nano bubbles.

  According to the exhaust gas treatment method of the present invention, the exhaust gas is pretreated with the washing water containing micro-nano bubbles in the pretreatment device, so even if the concentration of the exhaust gas introduced into the pretreatment device changes, the exhaust gas treatment device The exhaust gas treatment can be stabilized, the exhaust gas component removal rate in the exhaust gas can be stabilized, and the exhaust gas component removal rate can be improved.

  Moreover, in the exhaust gas treatment method of one embodiment, the washing water contains microorganisms having an MLSS concentration of 300 ppm or more.

  According to this embodiment, exhaust gas components in exhaust gas, particularly volatile organic compounds, can be efficiently microbially decomposed by washing water containing microorganisms having an MLSS (Mixed Liquor Suspended Solid) concentration of 300 ppm or more. .

Further, in the exhaust gas treatment system of one embodiment, a pretreatment device for pretreating exhaust gas with washing water containing micro-nano bubbles,
An exhaust gas treatment device for introducing the exhaust gas pretreated by the pretreatment device and washing the exhaust gas with washing water containing micro-nano bubbles is provided.

  According to the exhaust gas treatment system of this embodiment, since the exhaust gas is pretreated with the washing water containing micro-nano bubbles in the pretreatment device, even if the concentration of the exhaust gas introduced into the pretreatment device changes, the exhaust gas treatment device The exhaust gas treatment can be stabilized, the exhaust gas component removal rate in the exhaust gas can be stabilized, and the exhaust gas component removal rate can be improved.

  Moreover, in the exhaust gas treatment system of one embodiment, the washing water contains microorganisms having an MLSS concentration of 300 ppm or more.

  According to the exhaust gas treatment system of this embodiment, exhaust gas components, particularly volatile organic compounds, in exhaust gas can be efficiently microbially decomposed by washing water containing microorganisms having an MLSS concentration of 300 ppm or more.

  In one embodiment, the exhaust gas contains a volatile organic compound.

  According to the exhaust gas treatment system of this embodiment, it has been found that the volatile organic compound is contained in the cleaning water that has cleaned the exhaust gas containing the volatile organic compound, and micro-nano bubbles are likely to be generated in the cleaning water. Accordingly, it is possible to improve the adsorption effect of the exhaust gas component by the micro / nano bubbles.

  Moreover, the exhaust gas treatment system of one embodiment includes a urea addition unit that adds urea to the cleaning water of the exhaust gas treatment device, and a phosphoric acid addition unit that adds phosphoric acid to the cleaning water of the exhaust gas treatment device.

  According to the exhaust gas treatment system of this embodiment, by adding urea as a nitrogen source and phosphoric acid as a phosphorus source to the wash water, it is possible to efficiently propagate microorganisms in the wash water. In addition, when exhaust gas contains a volatile organic compound, this volatile organic compound becomes a carbon source and is useful for propagation of microorganisms.

  Moreover, the exhaust gas treatment system of one embodiment includes a domestic wastewater treatment water addition unit that adds treatment water from the domestic wastewater treatment device to the cleaning water of the exhaust gas treatment device.

  According to the exhaust gas treatment system of this embodiment, microorganisms can be propagated and activated in the wash water with various minerals contained in the treated water from the domestic wastewater treatment apparatus.

  Moreover, in the exhaust gas treatment system of one embodiment, the exhaust gas treatment apparatus is introduced with an upper watering part for spraying the washing water containing the micro-nano bubbles into the exhaust gas and the cleaning water sprayed by the upper watering part. A lower water tank section.

  According to the exhaust gas treatment system of this embodiment, it is possible to reduce the installation floor area by configuring the exhaust gas treatment device with an upper watering part and a lower water tank part arranged vertically.

  Moreover, in the exhaust gas treatment system of one embodiment, the lower water tank section includes a lower first water tank in which the micro / nano bubble generator is installed, and a water spray pump that sends cleaning water containing micro / nano bubbles to the upper water spray section. And a lower second water tank installed.

  According to the exhaust gas treatment system of this embodiment, in the lower water tank section, the lower first water tank in which the micro / nano bubble generator is installed can be a water tank for generating micro / nano bubbles, By avoiding obstacles such as clogging, washing water containing micro-nano bubbles can be produced efficiently. And the washing water containing a micro nano bubble can be sent to an upper watering part from a lower 2nd water tank with a watering pump.

  The exhaust gas treatment system according to an embodiment further includes an introduction unit that introduces cleaning water, which has been cleaned of exhaust gas by the pretreatment device, into the lower water tank unit, and the lower water tank unit is configured to perform the pretreatment from the lower second water tank. The apparatus has a delivery unit that delivers cleaning water containing micro-nano bubbles.

  According to the exhaust gas treatment system of this embodiment, the cleaning water containing micro-nano bubbles circulates between the pretreatment device and the exhaust gas treatment device, and the exhaust gas treatment system in which the pretreatment device and the exhaust gas treatment device are organically connected. Can be constructed, and the exhaust gas treatment efficiency can be improved.

  Moreover, in the exhaust gas treatment system of one embodiment, the lower second water tank has a polyvinylidene chloride filler.

  According to the exhaust gas treatment system of this embodiment, microorganisms can be propagated on the polyvinylidene chloride filler of the lower second water tank, and the microorganisms can be activated by the micro-nano bubbles generated in the lower first water tank. Therefore, microbial decomposition of exhaust gas components in the wash water can be promoted.

  In one embodiment of the exhaust gas treatment system, the polyvinylidene chloride filler is a string-type polyvinylidene chloride filler or a ring-type polyvinylidene chloride filler.

  According to the exhaust gas treatment system of this embodiment, microorganisms can be efficiently propagated in the string-type polyvinylidene chloride filler or the ring-type polyvinylidene chloride filler, and the microorganism treatment can be promoted.

  Moreover, in the exhaust gas treatment system of one embodiment, the lower second water tank has charcoal.

  According to the exhaust gas treatment system of this embodiment, microorganisms can be propagated on charcoal in the lower second water tank, and the microorganisms can be activated by the micro-nano bubbles generated in the lower first water tank. Therefore, microbial decomposition of exhaust gas components in the wash water can be promoted.

  Moreover, in the exhaust gas treatment system of one embodiment, the upper watering part includes a plastic filler and a polyvinylidene chloride filler.

  According to the exhaust gas treatment system of this embodiment, microorganisms propagate on the polyvinylidene chloride filler included in the upper watering portion of the exhaust gas treatment apparatus, so that the exhaust gas can be treated with these microorganisms.

  Moreover, in the exhaust gas treatment system of one embodiment, the charcoal included in the lower second water tank is at least one of activated carbon, Bincho charcoal, and synthetic charcoal.

  According to the exhaust gas treatment system of this embodiment, the charcoal to be installed in the lower second tank is selected from activated carbon, Bincho charcoal, and synthetic charcoal according to the properties of the exhaust gas to be treated and the exhaust gas concentration after treatment. That's fine.

  The exhaust gas treatment system according to an embodiment further includes an introduction unit that introduces the cleaning water, which has been cleaned of the exhaust gas by the pretreatment device, into the exhaust gas treatment device, and the exhaust gas treatment device includes a micro-nano bubble in the cleaning water. Has a nanobubble generator.

  According to the exhaust gas treatment system of this embodiment, cleaning water containing a volatile organic compound from the pretreatment device is introduced into the exhaust gas treatment device. Therefore, the micro / nano bubble generator of the exhaust gas treatment apparatus can efficiently generate micro / nano bubbles in the washing water containing the volatile organic compound.

  Moreover, in the exhaust gas treatment system of one embodiment, the pretreatment device is a water scrubber into which cleaning water containing the micro-nano bubbles is introduced from the exhaust gas treatment device.

  According to the exhaust gas treatment system of this embodiment, the cleaning water that has washed the exhaust gas is introduced from the pretreatment device into the exhaust gas treatment device, and the cleaning water containing micro-nano bubbles is introduced from the exhaust gas treatment device to the water scrubber that forms the pretreatment device. To do. Therefore, it is possible to improve the exhaust gas treatment efficiency by constructing a system that organically connects the water scrubber (pretreatment device) and the exhaust gas treatment device.

  Moreover, in the exhaust gas processing system of one Embodiment, the pre-processing apparatus which is the said water scrubber has a filler.

  According to the exhaust gas treatment system of this embodiment, the exhaust gas cleaning performance by the water scrubber can be further improved because the water scrubber has the filler.

  According to the exhaust gas treatment method of the present invention, the exhaust gas is pretreated with the washing water containing micro-nano bubbles in the pretreatment device, so even if the concentration of the exhaust gas introduced into the pretreatment device changes, the exhaust gas treatment device The exhaust gas treatment can be stabilized, the exhaust gas component removal rate in the exhaust gas can be stabilized, and the exhaust gas component removal rate can be improved.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

(First embodiment)
FIG. 1 schematically shows a first embodiment of the exhaust gas treatment system of the present invention. The first embodiment includes a pretreatment device 37 and an exhaust gas treatment device 3 at the subsequent stage. The pretreatment device 37 includes an upper watering portion 38 and a lower water tank 31, and a pretreatment device exhaust gas inlet 32 installed between the upper watering portion 38 and the lower water tank 31.

  Further, the exhaust gas treatment device 3 includes an upper watering part 19 and a lower water tank part 20 and an exhaust inlet 1 installed between the upper watering part 19 and the lower water tank part 20. The exhaust inlet 1 is connected to the upper watering part 19. An exhaust fan 2 is installed at the exhaust inlet 1. The upper water sprinkling part 19 has the uppermost exhaust outlet 4.

  In this exhaust gas treatment system, exhaust gas containing a volatile organic compound from a semiconductor factory or a liquid crystal factory is introduced into the pretreatment device 37 from the exhaust gas inlet 32 as an example by driving the exhaust fan 2, and then the exhaust inlet 1 to the exhaust gas treatment device 3. Thus, the exhaust gas is processed by the combination of the pretreatment device 37 and the exhaust gas treatment device 3 and is discharged from the exhaust outlet 4.

  In the pretreatment device 37, the watering nozzle 33 is installed in the upper watering portion 38. The watering nozzle 33 is connected to a watering pipe 34, and the watering pipe 34 is connected to the cleaning water pipe 6 via a valve 29. This washing water pipe 6 is connected to a watering nozzle 5 installed in an upper watering part 19 of the exhaust gas treatment device 3 via a valve 28. The washing water pipe 6 is connected to a watering pump 7, and the watering pump 7 is connected to a pipe protruding into the lower second water tank 23. The sprinkling pipe 34, the valve 29, the cleaning water pipe 6 and the sprinkling pump 7 constitute a delivery part.

  Accordingly, by driving the watering pump 7, the washing water in the lower second water tank 23 of the exhaust gas treatment device 3 is sprinkled from the watering nozzle 33 of the upper watering portion 38 of the pretreatment device via the washing water pipe 6 and the watering pipe 34. Is done. The exhaust gas introduced from the exhaust gas inlet 32 is washed with washing water sprayed from the sprinkling nozzle 33, and a part of the volatile organic compound contained in the exhaust gas is stored in the lower water tank 31 as washing waste water together with the washing water. The And the washing | cleaning waste_water | drain containing the volatile organic compound of this lower water tank 31 is introduce | transduced into the lower 1st water tank 18 of the exhaust gas treatment apparatus 3 of a back | latter stage through the pre-processing apparatus waste_water | drain piping 35 which makes an introducing | transducing part.

  Next, the exhaust gas pretreated with the volatile organic compound or the like in the pretreatment device 37 passes through the exhaust inlet 1 and is introduced into the exhaust gas treatment device 3 by the exhaust fan 2.

  Here, the exhaust gas containing the volatile organic compound mentioned above is not limited to the exhaust gas containing the volatile organic compound from the semiconductor factory or the liquid crystal factory, but contains the volatile organic compound from the painting factory, the automobile factory, etc. The exhaust gas to be used may be used. The generation source of the exhaust gas is not particularly limited. Examples of the volatile organic compound include isopropyl alcohol, acetone, butyl acetate and the like, but other various volatile organic compounds may be used.

  In this exhaust gas treatment device 3, the washing water of the lower water tank unit 20 is transferred to the upper watering unit 19 via the washing water pipe 6 by the watering pump 7 and sprinkled from the watering nozzle 5. The upper watering part 19 is provided with a porous plate 9 and a plastic filler 8 in order from the bottom. As this plastic filler 8, for example, a filler called a trade name “Terraret” is used. Above the top of the plastic filler 8 of the exhaust gas treatment device 3, the watering nozzle 5 is installed at a predetermined distance.

On the other hand, the lower water tank unit 20 of the exhaust gas treatment apparatus 3 includes a lower first water tank 18 and a lower second water tank 23 below the first water tank 18, and the micro-nano bubble generator 13 is installed in the lower first water tank 18. . The micro / nano bubble generator 13 is connected to the circulation pump 10 by piping, and the circulation pump 10 supplies the cleaning water in the lower second water tank 23 to the micro / nano bubble generator 13 in a necessary pressure state. By supplying cleaning water to the micro / nano bubble generator 13 in a necessary pressure state, the micro / nano bubble generator 13 efficiently generates micro / nano bubbles. The required pressure means, for example, 1.5 kg / cm ² or more. The micro / nano bubble generator 13 needs air to generate micro / nano bubbles, but a necessary amount of air is secured from the valve 12 and the air suction pipe 11.

  Thus, since the micro / nano bubble generator 13 is installed in the lower first water tank 18 to generate micro / nano bubbles, the washing water in the lower first water tank contains micro / nano bubbles. At the same time, the micro / nano bubbles generate a micro / nano bubble flow 14 and agitate the inside of the lower first water tank 18.

  Then, the wash water overflowed (naturally flowing) from the lower first water tank 18 is introduced into the lower second water tank 23. The lower second water tank 23 is filled with a string-like polyvinylidene chloride filler 22. The string-like polyvinylidene chloride filler 22 is fixed in the lower second water tank 23 by a fixing bracket 21. Then, the washing water containing the micro / nano bubbles in the lower second water tank portion 23 is passed through the washing water pipe 6 by the watering pump 7 installed outside the lower second water tank 23, and the watering nozzle of the upper watering portion 19. 5 is sprinkled water. The washing water containing the micro / nano bubbles sprayed from the spray nozzle 5 is sprayed on the plastic filler 8 and comes into contact with the pretreated exhaust gas introduced from the exhaust inlet, thereby adsorbing the exhaust gas component of the exhaust gas. Then, the washing water that has passed through the plastic filler 8 in the upper watering part 19 falls from the perforated plate 9 to the lower first water tank 18.

  Here, it was confirmed by experiments that the washing water containing micro-nano bubbles has a better removal rate of volatile organic compounds in the exhaust gas than the washing water not containing micro-nano bubbles. As the reason, it is considered that the cleaning water containing the micro / nano bubbles expands the cleaning effect on the dirt component in the gas.

  In the lower second water tank 23, as described above, since the string-type polyvinylidene chloride filler 22 is filled, microorganisms activated by the micro-nano bubbles contained in the washing water propagate. Then, the activated microorganisms treat exhaust gas components (such as volatile organic compounds) in the washing water with microorganisms. Note that a ring-type polyvinylidene chloride filler may be used instead of the string-type polyvinylidene chloride filler 22.

  As an example, the wash water in the lower second water tank 23 contains microorganisms having a concentration of MLSS (mixed suspended matter) of 300 ppm or more. According to the washing water containing microorganisms having an MLSS concentration of 300 ppm or more, exhaust gas components in exhaust gas, particularly volatile organic compounds, can be efficiently microbially decomposed.

  Further, urea is added to the lower second water tank 23 from the urea tank 25 by the urea metering pump 24, and phosphoric acid is added from the phosphoric acid tank 27 by the phosphoric acid metering pump 26. These urea and phosphoric acid function as microbial nutrients and improve the performance of microbial degradation in the lower second water tank 23. In this embodiment, (i) a carbon source (derived from a volatile organic compound), (ii) urea as a nitrogen source, and (iii) phosphoric acid as a phosphorus source are supplied to the microorganisms in the lower second water tank 23. As a result, it was found by experiments that the microbial degradation performance is improved.

  As described above, in the first embodiment, since the exhaust gas is pretreated with the washing water containing micro-nano bubbles in the pretreatment device 37, the exhaust gas treatment is performed even when the concentration of the exhaust gas introduced into the pretreatment device 37 changes. The exhaust gas treatment in the apparatus 3 can be stabilized, the exhaust gas component removal rate in the exhaust gas can be stabilized, and the exhaust gas component removal rate can be improved.

  Moreover, in this 1st Embodiment, the lower water tank part 20 can make the lower 1st water tank 18 in which the micro nano bubble generator 13 was installed into the water tank for generating a micro nano bubble, and the micro nano bubble generator 13 is By avoiding obstacles such as clogging, washing water containing micro-nano bubbles can be produced efficiently. In the first embodiment, cleaning water containing micro-nano bubbles is circulated between the pretreatment device 37 and the exhaust gas treatment device 3, and the exhaust gas organically connected to the pretreatment device 37 and the exhaust gas treatment device 3. A treatment system can be constructed, and exhaust gas treatment efficiency can be improved.

  As the micro-nano bubble generator 13, for example, a commercially available one can be adopted, but the manufacturer is not limited. In this embodiment, as a specific example, those of Nano Planet Research Laboratory Co., Ltd. and Auratech Co., Ltd. were adopted.

  Here, three types of bubbles will be described.

  (i) Normal bubbles (bubbles) rise in the water and eventually disappear on the surface by popping bread.

  (ii) Microbubbles are fine bubbles having a diameter of 10 (μm) to several tens (μm) or less, shrink in water, and eventually disappear (completely dissolve).

  (iii) Nanobubbles are said to be bubbles that are smaller than microbubbles (100 to 200 nm with a diameter of 1 (μm) or less) and can exist in water forever. Micro-nano bubbles can be described as bubbles in which micro-bubbles and nano-bubbles are mixed.

(Second embodiment)
Next, FIG. 2 shows a second embodiment of the exhaust gas treatment system of the present invention. This second embodiment is different from the second embodiment shown in FIG. 1 only in that the upper watering part 38U is provided instead of the upper watering part 38 of the pretreatment device 37 of FIG. And different. Therefore, in the second embodiment, the same parts as those in the first embodiment described above are denoted by the same reference numerals and detailed description thereof will be omitted, and parts different from those in the first embodiment will be described.

  As shown in FIG. 2, in the second embodiment, the pretreatment device 37 </ b> U includes an upper watering part 38 </ b> U, and the upper watering part 38 </ b> U has a plastic filler 36 below the watering nozzle 33. The plastic filler 36 is installed on the perforated plate 30. In the second embodiment, the pretreatment device 37U that forms a water scrubber has installed the plastic filler 36 in the upper watering portion 38U, thereby promoting the contact between the cleaning water sprayed from the watering nozzle 33 and the exhaust gas. The exhaust gas cleaning performance by the water scrubber can be improved. That is, the removal rate of the volatile organic compound in the exhaust gas by the pretreatment device 37U can be improved as compared with the first embodiment.

(Third embodiment)
Next, FIG. 3 shows a third embodiment of the exhaust gas treatment system of the present invention. This third embodiment is different from the upper watering part 38U of the pretreatment device 37U in FIG. 2 only in that the upper watering part 38V is provided. Therefore, in the third embodiment, the same parts as those in the second embodiment described above are denoted by the same reference numerals and detailed description thereof is omitted, and parts different from those in the second embodiment described above will be described.

  As shown in FIG. 3, in the third embodiment, the pretreatment device 37 </ b> V includes an upper watering part 38 </ b> V, and the upper watering part 38 </ b> V includes a ring-type polyvinylidene chloride filler 15 below the watering nozzle 33. Yes. The ring-type polyvinylidene chloride filler 15 is installed on the perforated plate 30.

  In the third embodiment, the ring-type polyvinylidene chloride filler 15 having a significantly larger surface area than the plastic filler is installed in the upper watering portion 38V. Of microorganisms can be propagated. Therefore, the pretreatment device 37V becomes a pretreatment device 37V having a microbiological function, and the volatile organic compound removal rate in the exhaust gas in the pretreatment device 37V can be improved as compared with the first and second embodiments. That is, the exhaust gas treatment performance of the pretreatment device 37V is improved.

  Note that the ring-type polyvinylidene chloride filler 15 has a negative charge, and various microorganisms are easily attached and easily propagated. Naturally, the removal rate of volatile organic compounds is improved if various microorganisms grow.

(Fourth embodiment)
Next, FIG. 4 shows a fourth embodiment of the exhaust gas treatment system of the present invention. The fourth embodiment differs from the second embodiment described above in that the exhaust gas treatment device 3W includes a lower water tank 20W instead of the lower water tank 20 of FIG. Therefore, in the fourth embodiment, the same portions as those in the second embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and portions different from those in the second embodiment are described.

  As shown in FIG. 4, in the fourth embodiment, the lower water tank unit 20 </ b> W of the exhaust gas treatment device 3 </ b> W has a lower second water tank 23 </ b> W instead of the lower second water tank 23. The lower second water tank 23W includes a ring-type polyvinylidene chloride filler 15 instead of the string-type polyvinylidene chloride filler 22. As shown in FIG. 4, the ring-type polyvinylidene chloride filler 15 is filled in a region defined by the mesh 16 and the bottom of the lower first water tank 18.

  In the fourth embodiment, microorganisms activated by micro-nano bubbles propagate in the ring-type polyvinylidene chloride filler 15 in the lower second water tank 23, and the microorganisms are exhaust gas components (volatile organic compounds) absorbed by the washing water from the exhaust gas. Etc.).

(Fifth embodiment)
Next, FIG. 5 shows a fifth embodiment of the exhaust gas treatment system of the present invention. The fifth embodiment differs from the second embodiment described above in that the exhaust gas treatment device 3X includes a lower water tank 20X instead of the lower water tank 20 of FIG. Therefore, in the fifth embodiment, the same parts as those in the second embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and parts different from those in the second embodiment are described.

  As shown in FIG. 5, in the fifth embodiment, the lower water tank portion 20 </ b> X includes a lower second water tank 23 </ b> X, and the lower second water tank 23 </ b> X includes charcoal 17. The charcoal 17 is installed in an area partitioned by the net 16. In the fifth embodiment, activated microorganisms propagate on charcoal 17 installed in the lower second water tank 23X, and exhaust gas components (such as volatile organic compounds) in the exhaust gas absorbed by the washing water are microbially decomposed. Become.

(Sixth embodiment)
Next, FIG. 6 shows a sixth embodiment of the exhaust gas treatment system of the present invention. The sixth embodiment differs from the first embodiment described above in that the exhaust gas treatment device 3Y includes an upper watering part 19Y instead of the upper watering part 19 in FIG. Therefore, in the sixth embodiment, the same parts as those in the first embodiment described above are denoted by the same reference numerals and detailed description thereof will be omitted, and parts different from those in the first embodiment will be described.

  In this sixth embodiment, the upper water sprinkling part 19Y of the exhaust gas treatment device 3Y is provided on the ring-type polyvinylidene chloride filler 15 as the lowermost stage packing on the perforated plate 9, and on the ring-type polyvinylidene chloride filler 15 And a laminated plastic filler 8. That is, in the sixth embodiment, not only the plastic filler 8 but also the ring-type polyvinylidene chloride filler 15 is installed as the filler in the upper watering part 19Y of the exhaust gas treatment device 3Y downstream of the pretreatment device 37. Yes.

  Therefore, in the sixth embodiment, more activated microorganisms propagate in the upper watering portion 19Y than in the case where the plastic material 8 is the only filler in the upper watering portion 19Y. Therefore, in the sixth embodiment, the removal rate of volatile organic compounds in the exhaust gas is improved as compared with the first embodiment described above.

(Seventh embodiment)
Next, FIG. 7 shows a seventh embodiment of the exhaust gas treatment system of the present invention. The seventh embodiment differs from the first embodiment only in that the seventh embodiment is introduced from the treated water pipe L1 into the lower second water tank 23 of the lower water tank section 20 of the exhaust gas treatment device 3. Therefore, in the seventh embodiment, the same portions as those in the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted, and portions different from those in the first embodiment are described.

  In this seventh embodiment, the treated water from the domestic wastewater treatment facility is introduced into the lower second water tank 23 from the treated water pipe L1 forming the domestic wastewater treated water addition section, but this treated water contains a trace amount. Minerals such as magnesium, potassium, calcium, iron and the like further increase the microbial activity in the wash water in the lower second water tank 23. Therefore, the removal performance of exhaust gas components such as organic compounds contained in the exhaust gas is further increased.

  In addition, if minerals, such as magnesium, potassium, calcium, iron, etc. which are required for microorganisms are contained, the treated water introduced into the lower second water tank 23 from the treated water pipe L1 is particular about the treated water of the domestic wastewater treatment facility. Of course, treated water such as food wastewater may be used.

(Experimental example)
An experimental apparatus corresponding to the exhaust gas treatment system of the first embodiment of FIG. 1 was manufactured. In this experimental apparatus, the capacity of the pretreatment device 37 was set to 2 m ^3, and the overall capacity of the exhaust gas treatment device 3 subsequent to the pretreatment device 37 was set to 4 m ³ . Further, the internal volume of the lower first water tank 18 of the exhaust gas treatment apparatus 3 and 0.5 m ^3, the volume of the lower second water tank 23 was set to 1 m ^3. Then, an isopropyl alcohol-containing exhaust gas was introduced into this experimental apparatus, and a test operation was performed for about one month. After this trial operation, the isopropyl alcohol concentration at the exhaust gas inlet 1 and the isopropyl alcohol concentration at the exhaust outlet 4 were measured, and the removal rate of isopropyl alcohol was measured. The removal rate was 92%.

It is a figure showing typically a 1st embodiment of an exhaust gas treatment device of this invention. It is a figure which shows typically 2nd Embodiment of the waste gas processing apparatus of this invention. It is a figure which shows typically 3rd Embodiment of the waste gas processing apparatus of this invention. It is a figure which shows typically 4th Embodiment of the waste gas processing apparatus of this invention. It is a figure which shows typically 5th Embodiment of the waste gas processing apparatus of this invention. It is a figure which shows typically 6th Embodiment of the waste gas processing apparatus of this invention. It is a figure which shows typically 7th Embodiment of the waste gas processing apparatus of this invention.

Explanation of symbols

1 Exhaust gas inlet 2 Exhaust fan
3, 3W, 3X, 3Y Exhaust gas treatment device 4 Exhaust outlet 5 Sprinkling nozzle 6 Washing water pipe 7 Sprinkling pump 8 Plastic filler 9 Porous plate 10 Circulating pump 11 Air suction pipe 12 Valve 13 Micro / nano bubble generator 14 Micro / nano bubble flow 15 Ring Type Polyvinylidene Chloride Filler 16 Ami 17 Charcoal 18 Lower First Water Tank 19, 19Y Upper Watering Part 20, 20X Lower Water Tank Part 21 Fixing Fixture 22 Stringed Polyvinylidene Chloride Filler 23, 23W, 23X Lower Second Water Tank 24 Urea Metering pump 25 Urea tank 26 Phosphoric acid metering pump 27 Phosphoric acid tank 28 Valve 29 Valve 30 Perforated plate 31 Lower water tank 32 Exhaust gas inlet 33 Sprinkling nozzle 34 Sprinkling pipe 35 Pretreatment device drainage pipe 36 Plastic filler 37, 37U, 37V Pretreatment Device 38 , 38U, 38V Upper watering part

Claims (18)

A step of pretreating exhaust gas with washing water containing micro-nano bubbles in a pretreatment device;
A process for introducing the pretreated exhaust gas into an exhaust gas treatment apparatus and treating it with washing water containing micro-nano bubbles. The exhaust gas treatment method according to claim 1,
The exhaust gas treatment method, wherein the washing water contains microorganisms having an MLSS (Mixed Liquor Suspended Solid) concentration of 300 ppm or more. A pretreatment device for pretreating exhaust gas with washing water containing micro-nano bubbles;
An exhaust gas treatment system comprising: an exhaust gas treatment device for introducing exhaust gas pretreated by the pretreatment device and washing the exhaust gas with washing water containing micro-nano bubbles. The exhaust gas treatment system according to claim 3,
The exhaust gas treatment system, wherein the washing water contains microorganisms having an MLSS concentration of 300 ppm or more. The exhaust gas treatment system according to claim 3,
An exhaust gas treatment system, wherein the exhaust gas contains a volatile organic compound. The exhaust gas treatment system according to claim 3,
A urea addition section for adding urea to the cleaning water of the exhaust gas treatment device;
An exhaust gas treatment system comprising: a phosphoric acid addition unit for adding phosphoric acid to cleaning water of the exhaust gas treatment device. The exhaust gas treatment system according to claim 3,
An exhaust gas treatment system comprising a domestic wastewater treatment water addition unit for adding treated water from a domestic wastewater treatment device to cleaning water of the exhaust gas treatment device. The exhaust gas treatment system according to claim 3,
The exhaust gas treatment apparatus is
An upper watering part for spraying cleaning water containing the micro-nano bubbles into the exhaust gas;
An exhaust gas treatment system, comprising: a lower water tank part into which cleaning water sprinkled by the upper watering part is introduced. The exhaust gas treatment system according to claim 8,
The lower tank part is
A lower first water tank in which the micro-nano bubble generator is installed;
An exhaust gas treatment system comprising: a lower second water tank provided with a watering pump for sending cleaning water containing micro-nano bubbles to the upper watering part. The exhaust gas treatment system according to claim 9,
An introduction part for introducing cleaning water, which has been washed with exhaust gas by the pretreatment device, into the lower water tank part;
The lower tank part is
An exhaust gas treatment system comprising: a delivery unit that delivers cleaning water containing micro / nano bubbles from the lower second water tank to the pretreatment device. The exhaust gas treatment system according to claim 9,
The lower second tank is
An exhaust gas treatment system comprising a polyvinylidene chloride filler. The exhaust gas treatment system according to claim 11,
The polyvinylidene chloride filler is
An exhaust gas treatment system characterized by being a string-type polyvinylidene chloride filler or a ring-type polyvinylidene chloride filler. The exhaust gas treatment system according to claim 9,
The lower second tank is
An exhaust gas treatment system characterized by having charcoal. The exhaust gas treatment system according to claim 8,
The upper watering part is
With plastic filler,
An exhaust gas treatment system comprising a polyvinylidene chloride filler. The exhaust gas treatment system according to claim 13,
The exhaust gas treatment system characterized in that the charcoal of the lower second water tank is at least one of activated carbon, Bincho charcoal, and synthetic charcoal. In the exhaust gas treatment system according to claim 5,
Including an introduction part for introducing cleaning water, which has been cleaned of exhaust gas with the pretreatment device, into the exhaust gas treatment device;
The exhaust gas treatment apparatus is
An exhaust gas treatment system comprising a micro / nano bubble generator that contains micro / nano bubbles in washing water. The exhaust gas treatment system according to claim 16,
The pretreatment device is
An exhaust gas treatment system, which is a water scrubber into which cleaning water containing the micro-nano bubbles is introduced from the exhaust gas treatment device. The exhaust gas treatment system according to claim 17,
The exhaust gas treatment system, wherein the pretreatment device which is the water scrubber has a filler.

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