JP2007237042A - Waste gas treatment method and waste gas treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waste gas treatment method and a waste gas treatment apparatus which are energy saving and low in cost. <P>SOLUTION: When using the waste gas treatment apparatus 3, the upper water-spraying part 19 can effectively remove a volatile organic compound from a waste gas by using the cleaning adsorbing action of micronano bubbles contained in a cleaning water introduced from the lower water-tank part 20. Then, the lower water-tank part 20 can effectively bacterially treat the volatile organic compound contained in the cleaning water after this removal by bacteria activated with micronano bubbles. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an exhaust gas treatment method and an exhaust gas treatment apparatus. As an example, the present invention relates to an exhaust gas treatment method and an exhaust gas treatment device capable of efficiently generating micro / nano bubbles in the wash water of an exhaust gas treatment device by utilizing a volatile organic compound in the exhaust gas.

From the viewpoint of air pollution, volatile organic compounds in exhaust gas need to be treated. For example, a volatile organic compound in exhaust gas of 1000 ppm or more needs to be treated reliably, but conventionally, a combustion method that wastes energy has 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

  Therefore, an object of the present invention is to provide an exhaust gas treatment method and an exhaust gas treatment device that are energy saving and low in cost.

In order to solve the above problems, an exhaust gas treatment method of the present invention includes a step of washing exhaust gas containing a volatile organic compound with washing water,
Adding micro-nano bubbles to the washing water containing the volatile organic compound by a micro-nano bubble generator and generating microorganisms in the washing water;
And a step of treating exhaust gas with washing water containing micro-nano bubbles and microorganisms.

  According to the exhaust gas treatment method of the present invention, the volatile organic compound can be efficiently removed from the exhaust gas by utilizing the cleaning and adsorption action of the micro / nano bubbles contained in the cleaning water. In addition, the volatile organic compound contained in the washing water after the removal treatment can be efficiently treated with microorganisms activated by micro-nano bubbles.

  Therefore, according to the present invention, the exhaust gas treatment efficiency can be improved, and the generation of waste water accompanying the exhaust gas treatment can be suppressed, thereby realizing an energy saving and low cost exhaust gas treatment method.

  In addition, it turned out that it becomes easy to generate | occur | produce a micro nano bubble because wash water contains a volatile organic compound.

  Moreover, the exhaust gas treatment method of one embodiment sets the microbial concentration of the washing water to 300 ppm or more in terms of MLSS (mixed suspended matter concentration).

  According to the exhaust gas treatment method of this embodiment, the volatile organic compound can be efficiently microbially treated with washing water having a microorganism concentration of 300 ppm or more in MLSS.

In addition, the exhaust gas treatment apparatus of one embodiment includes a cleaning unit that cleans exhaust gas containing a volatile organic compound with cleaning water;
Washing water containing the volatile organic compound is introduced from the washing unit, and the washing water containing the volatile organic compound has a micro / nano bubble generator that contains micro / nano bubbles and the washing water containing the micro / nano bubbles. And a washing water treatment part for introducing washing water containing the micro-nano bubbles and microorganisms into the washing part.

  According to the exhaust gas treatment apparatus of this embodiment, the cleaning unit efficiently removes volatile organic compounds from the exhaust gas by using the cleaning adsorption action of the micro / nano bubbles contained in the cleaning water introduced from the cleaning water processing unit. Can be removed. In the washing water treatment section, the volatile organic compound contained in the washing water after the removal treatment can be efficiently treated with microorganisms activated by micro-nano bubbles. Therefore, according to this embodiment, the exhaust gas treatment efficiency can be improved and the generation of waste water accompanying the exhaust gas treatment can be suppressed, so that an energy saving and low cost exhaust gas treatment apparatus can be realized.

  Moreover, in the exhaust gas treatment apparatus of one embodiment, the washing water treatment unit causes the washing water to contain 300 ppm or more of microorganisms in MLSS (mixed suspended matter concentration).

  According to the exhaust gas treatment apparatus of this embodiment, the washing water treatment section can perform microbial treatment of volatile organic compounds with high efficiency by using washing water having a microorganism concentration of 300 ppm or more in MLSS. Thereby, it became possible to eliminate generation | occurrence | production of the waste_water | drain accompanying exhaust gas treatment.

Moreover, in the exhaust gas treatment apparatus of one embodiment, the cleaning unit is an upper watering unit that sprays the cleaning water onto the exhaust gas containing the volatile organic compound to clean the exhaust gas.
The cleaning water treatment unit is configured such that the cleaning water containing the volatile organic compound is introduced from the upper watering unit by natural fall and the cleaning water containing the volatile organic compound, micro-nano bubbles and microorganisms is supplied to the upper watering unit. It is the lower water tank part which has the watering pump sent out to.

  According to the exhaust gas treatment apparatus of this embodiment, since the cleaning unit and the cleaning water processing unit are the upper watering unit and the lower water tank unit, a compact device can be obtained.

  Moreover, in the exhaust gas treatment apparatus 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 lower second water tank in which the watering pump is installed.

  According to the exhaust gas treatment apparatus of this embodiment, the lower water tank section can be a water tank for generating micro-nano bubbles in the lower first water tank in which the micro-nano bubble generator is installed. By avoiding obstacles such as clogging, washing water containing micro-nano bubbles can be produced efficiently.

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

  According to the exhaust gas treatment apparatus of this embodiment, urea and phosphoric acid are added to the washing water of the washing water treatment unit by the urea addition unit and the phosphoric acid addition unit, thereby creating an environment in which microorganisms can easily propagate in the washing water. Can do. That is, the washing water contains not only a carbon source derived from a volatile organic compound but also urea as a nitrogen source and phosphoric acid as a phosphorus source, so that microorganisms can efficiently propagate.

  Moreover, in the exhaust gas treatment apparatus of one embodiment, it has a domestic treatment water addition part which adds the treated water from a domestic wastewater treatment apparatus to the washing water of the said washing water treatment part.

  According to the exhaust gas treatment apparatus of this embodiment, by adding the treated water from the domestic wastewater treatment apparatus to the wash water of the wash water treatment unit, a trace amount of minerals contained in the treated water is converted into microorganisms in the wash water. Can be further activated to promote the growth of microorganisms.

  In one embodiment, the upper watering part has a plastic filler, and the lower second water tank of the lower water tank part has a polyvinylidene chloride filler.

  According to the exhaust gas treatment apparatus of this embodiment, the upper water sprinkling part has the plastic filler, so that the contact efficiency between the exhaust gas and the cleaning water can be improved and the exhaust gas treatment efficiency can be improved. In addition, microorganisms can be stably and efficiently propagated on the polyvinylidene chloride filler of the lower second water tank, and volatile organic compounds in the wash water in the lower water tank section can be microbially decomposed, so that microbial treatment can be promoted.

  In one embodiment, the lower second water tank has a string-type polyvinylidene chloride filler or a ring-type polyvinylidene chloride filler.

  According to the exhaust gas treatment apparatus of this embodiment, microorganisms stably and efficiently propagate on the string-type polyvinylidene chloride filler or ring-type polyvinylidene chloride filler as the polyvinylidene chloride filler. Microbial organic compounds can be efficiently degraded.

  Moreover, in the exhaust gas treatment apparatus of one embodiment, charcoal is installed in the lower second water tank.

  According to the exhaust gas treatment apparatus of this embodiment, in the lower second water tank, microorganisms activated by micro-nano bubbles can be stably propagated on charcoal, and volatile organic compounds in the wash water can be efficiently microbially decomposed.

  Moreover, in the exhaust gas processing apparatus of one Embodiment, the said upper water sprinkling part has a plastic filler and a polyvinylidene chloride filler.

  According to the exhaust gas treatment apparatus of this embodiment, microorganisms activated in the polyvinylidene chloride filler can be propagated in the upper watering part, and the volatile organic compounds in the exhaust gas can be directly decomposed by the microorganisms. As a result, the volatile organic compound removal rate in the exhaust gas can be improved. As the polyvinylidene chloride filler, it is preferable to employ a ring-type polyvinylidene chloride filler or a string-type polyvinylidene chloride filler.

In the exhaust gas treatment apparatus of an embodiment, the upper watering part is
A space into which the exhaust gas is introduced;
A first filler portion disposed above the space portion and having a plastic filler;
A second filler portion disposed below the space portion and having a polyvinylidene chloride filler;
The space part and the first and second filler parts communicate with each other.

  According to the exhaust gas treatment apparatus of this embodiment, the activated microorganisms are propagated in the polyvinylidene chloride filler of the second filler part, and the volatile organic compound absorbed in the washing water can be microbially decomposed. Further, since the second filler part below the space part does not hinder the flow of the exhaust gas from the space part to the first filler part above, the exhaust gas is efficiently introduced from the space part to the first filler part. Thus, exhaust gas treatment at the first filler part can be promoted. As the polyvinylidene chloride filler, it is preferable to employ a ring-type polyvinylidene chloride filler or a string-type polyvinylidene chloride filler.

  In one embodiment, the charcoal is at least one of activated carbon, Bincho charcoal, and synthetic charcoal.

  According to the exhaust gas treatment apparatus of this embodiment, in the lower second water tank, the micro-nano bubbles enter the small holes of the activated carbon, Bincho charcoal, and synthetic charcoal, and the microorganisms that have entered the small holes are activated to volatilize the cleaning water. The organic compound is decomposed.

  According to the exhaust gas treatment method of the present invention, the volatile organic compound can be efficiently removed from the exhaust gas by utilizing the adsorption action of the micro / nano bubbles contained in the washing water. In addition, the volatile organic compound contained in the washing water after the removal treatment can be efficiently treated with microorganisms activated by micro-nano bubbles. Therefore, according to the present invention, the exhaust gas treatment efficiency can be improved, and the generation of waste water accompanying the exhaust gas treatment can be suppressed, thereby realizing an energy saving and low cost exhaust gas treatment method.

  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 apparatus of the present invention. The exhaust gas treatment apparatus 3 of the first embodiment includes an upper watering part 19 as a cleaning part and a lower water tank part 20 as a cleaning water treatment part.

  In FIG. 1, reference numeral 1 denotes an exhaust inlet, and exhaust gas is introduced from the exhaust inlet 1 into the upper sprinkler 19 by the exhaust fan 2. This exhaust gas is, for example, exhaust gas containing a volatile organic compound from a semiconductor factory or a liquid crystal factory. The exhaust gas introduced into the exhaust gas treatment device 3 from the exhaust inlet 1 is processed by the exhaust gas treatment device 3 and discharged from the exhaust outlet 4 that forms the top.

  The exhaust gas containing the volatile organic compound is not limited to exhaust gas containing a volatile organic compound from a semiconductor factory or a liquid crystal factory, but contains a volatile organic compound from a paint factory, an automobile factory, or the like. Exhaust gas may be used. That is, the generation source of the exhaust gas is not particularly limited. The volatile organic compound includes various volatile organic compounds other than isopropyl alcohol, acetone, butyl acetate and the like.

  In the upper watering part 19 of the exhaust gas treatment device 3, the washing water in the lower water tank part 20 is sprinkled from the watering nozzle 5 through the washing water pipe 6 by the watering pump 7. The upper watering part 19 includes a lowermost porous plate 9 and a plastic filler 8 installed on the porous plate 9, and the watering nozzle 5 is spaced above the plastic filler 8 by a predetermined distance. is set up. As the plastic filler 8, for example, a so-called terralet (trade name) can be adopted.

  Therefore, the exhaust gas introduced from the exhaust inlet 1 comes into contact with the washing water sprinkled from the sprinkling nozzle 5 while passing through the porous plate 9 and the plastic filler 8 in order, so that the exhaust gas component is removed and the exhaust gas is exhausted. Exhaust from the outlet 4. On the other hand, the washing water sprinkled from the watering nozzle 5 passes through the plastic filler 8 and the porous plate 9 in order and falls into the lower water tank section 20.

The lower water tank unit 20 includes a lower first water tank 18 and a lower second water tank 23, and the lower second water tank 23 is disposed below the lower first water tank 18. A micro-nano bubble generator 13 is installed in the lower first water tank 18. The micro / nano bubble generator 13 is connected to a circulation pump 10 installed outside the water tank 18 by piping, and the circulation pump 10 supplies the washing water in the lower first water tank 18 to a predetermined required for the micro / nano bubble generator 13. Supplying under pressure. Thereby, the micro / nano bubble generator 13 efficiently generates micro / nano bubbles. The required predetermined 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. The micro / nano bubble generator 13 generates micro / nano bubbles, so that the washing water in the lower first water tank unit 20 contains the micro / nano bubbles and causes the micro / nano bubble flow 14 to stir the lower first water tank 18. ing.

  The lower first water tank 18 is a water tank for generating micro / nano bubbles in which the micro / nano bubble generator 13 is installed, and is provided separately from the lower second water tank 23. Therefore, it is possible to efficiently produce cleaning water containing micro-nano bubbles while avoiding obstacles such as blocking of micro-nano bubble generator 13. Moreover, since the washing water which does not absorb the volatile organic compound in the exhaust gas falls from the upper watering part 19 to the lower first water tank 18, the washing water in the lower first water tank 18 is microscopic. The conditions are such that nanobubbles are easily generated.

  The washing water containing micro-nano bubbles overflowing (naturally flowing) from the lower first water tank 18 is introduced into the lower second water tank 23 filled with the string-type polyvinylidene chloride filler 22. Then, the washing water containing the micro-nano bubbles is fed from the lower second water tank 23 through the washing water pipe 6 to the watering nozzle 5 of the upper watering part 19 by the watering pump 7 as described above. Then, the watering nozzle 5 sprinkles cleaning water containing micro-nano bubbles on the plastic filler 8. It has been confirmed by experiments that the washing water containing micro-nano bubbles has a better removal rate of volatile organic compounds contained in the exhaust gas than the washing water not containing micro-nano bubbles. The reason for this is considered that the cleaning water containing micro-nano bubbles has an increased cleaning effect on dirt components in the gas.

  On the other hand, the string-type polyvinylidene chloride filler 22 installed in the lower second water tank 23 is fixed to the water tank 23 by a fixing fitting 21. Microorganisms activated by the micro-nano bubbles propagate on the string-like polyvinylidene chloride filler 22, and the washing water is subjected to microbial treatment by the activated microorganisms. In the lower second water tank 23, the washing water contains microorganisms of 300 ppm or more in MLSS (mixed suspended substance concentration). With this MLSS, washing water having a microbial concentration of 300 ppm or more enables volatile organic compounds to be microbially treated with high efficiency, and it is possible to eliminate the generation of wastewater associated with exhaust gas treatment.

  Moreover, in this embodiment, the urea tank 25 and the urea metering pump 24 which comprise a urea addition part, and the phosphoric acid tank 27 and the phosphoric acid metering pump 26 which comprise a phosphoric acid addition part are provided. Urea as a nutrient for microorganisms is added from the urea tank 25 to the lower second water tank 23 by the urea metering pump 24, and phosphoric acid as a nutrient for microorganisms is added from the phosphoric acid tank 27 to the bottom by the phosphoric acid metering pump 26. It is added to the second water tank 23. Thereby, the microorganisms in the lower 2nd water tank 23 improve the performance regarding microbial decomposition. That is, the microorganisms in the lower second water tank 23 are given (i) a carbon source (derived from a volatile organic compound), (ii) urea as a nitrogen source, and (iii) phosphoric acid as a phosphorus source. Experiments have shown that the microbial degradation performance is improved.

  Therefore, according to the exhaust gas treatment apparatus 3 of this embodiment, the upper watering unit 19 uses the adsorption action of the micro / nano bubbles contained in the washing water introduced from the lower water tank unit 20 to emit volatile organic compounds from the exhaust gas. Can be removed efficiently. Moreover, in the lower water tank part 20, a microbial treatment can be efficiently performed by the microorganisms activated by the micro-nano bubbles of the volatile organic compound contained in the wash water after the removal treatment. Therefore, according to this embodiment, it is possible to improve the exhaust gas treatment efficiency and eliminate the generation of waste water associated with the exhaust gas treatment, thereby realizing an energy saving and low cost exhaust gas treatment apparatus.

  Here, three types of bubbles will be described.

  (i) Normal bubbles (bubbles) rise in the water and eventually disappear on the surface by popping with 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 (diameter of 1 (μm) or less, for example, 100 to 200 nm) and can exist in water forever. Micro-nano bubbles can be described as bubbles in which micro-bubbles and nano-bubbles are mixed.

  As the micro / nano bubble generator 13, a commercially available one can be adopted as an example. However, the manufacturer is not limited, and specific examples include those of Nano Planet Research Laboratories and Auratec Co., Ltd. It can be adopted.

(Second embodiment)
Next, FIG. 2 shows a second embodiment of the exhaust gas treatment apparatus of the present invention. This second embodiment is different from the first embodiment described above only in that a lower second water tank 23U is provided instead of the lower second water tank 23 of the lower water tank section 20 of FIG. Therefore, in the second embodiment, the same parts as those of the first embodiment described above are denoted by the same reference numerals, detailed description thereof will be omitted, and parts different from those of the first embodiment will be described.

  As shown in FIG. 2, in the second embodiment, the lower second water tank 23U of the lower water tank section 20 is filled with a ring-type polyvinylidene chloride filler 15 in place of the string-type polyvinylidene chloride filler 22. Filled as a material. The ring-type polyvinylidene chloride filler 15 is filled in a space partitioned by the screen 16 and the bottom of the lower first water tank 20.

  In the second embodiment, the ring-type polyvinylidene chloride filler 15 filled in the lower second water tank 23 allows more microorganisms activated by the micro / nano bubbles to propagate, and the volatile organic compounds in the washing water are converted into microorganisms. Can be disassembled. When the string-type polyvinylidene chloride filler 22 and the ring-type polyvinylidene chloride filler 15 are compared, there is no particularly large difference in performance as a microorganism-immobilized carrier. The string-type polyvinylidene chloride filler 22 or the ring-type polyvinylidene chloride filler 15 may be selected according to the type of exhaust gas and the experimental results.

(Third embodiment)
Next, FIG. 3 shows a third embodiment of the exhaust gas treatment apparatus of the present invention. This third embodiment differs from the first embodiment described above only in that a lower second water tank 23V is provided instead of the lower second water tank 23 of the lower water tank section 20 of FIG. Therefore, in the third embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, detailed description thereof will be omitted, and parts different from those in the first embodiment will be described.

  As shown in FIG. 3, in this 3rd Embodiment, the lower 2nd water tank 23V which the lower water tank part 20 has is replaced with the string-type polyvinylidene chloride filler 22, and is filled with the charcoal 17 as a filler. . In the charcoal 17, more microorganisms activated by the micro / nano bubbles propagate in the lower second water tank 23V, and the volatile organic compounds in the wash water are microbially decomposed. The charcoal 17 has a large number of small holes, but micro-nano bubbles enter the small holes, and activated microorganisms also enter the small holes and propagate.

  The charcoal 17 includes activated carbon, Bincho charcoal, synthetic charcoal, and the like. The type of charcoal 17 may be selected according to the purpose.

(Fourth embodiment)
Next, FIG. 4 shows a fourth embodiment of the exhaust gas treatment apparatus of the present invention. This 4th Embodiment replaces with the upper watering part 19W instead of the upper watering part 19 of FIG. 1, and replaces with the lower 2nd water tank 23 of the lower water tank part 20 of FIG. The point provided is different from the first embodiment described above. Therefore, in the fourth embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, detailed description thereof will be omitted, and parts different from those in the first embodiment will be described.

  As shown in FIG. 4, in this fourth embodiment, the upper water sprinkling part 19W is provided with a single-stage ring-shaped polyvinylidene chloride filler 15 on the lowermost porous plate 9, and this ring-shaped polyvinylidene chloride filling is performed. A three-stage plastic filler 8 is installed on the material 15. In the fourth embodiment, the lower second water tank 23W of the lower water tank section 20 is filled with a filler (string-like polyvinylidene chloride filler 22) unlike the lower second water tank 23 of FIG. Not.

  In the fourth embodiment, the ring-shaped polyvinylidene chloride filler 15 on the lowermost porous plate 9 of the upper water sprinkling part 19W is sprinkled with washing water containing micro-nano bubbles from the lower water tank part 20, so that the ring Activated microorganisms propagate on the type 15 polyvinylidene chloride filler 15. The activated microorganisms microbially decompose volatile organic compounds in the exhaust gas introduced from the exhaust inlet 1.

  On the other hand, in the lower second water tank 23W of the lower water tank section 20, since the filler is not filled, microorganisms are in a fluid state in the lower second water tank 23W. Therefore, microorganisms contained in the washing water introduced from the lower second water tank 23W to the upper watering part 19W are concentrated on the ring-type polyvinylidene chloride filler 15 at the bottom of the upper watering part 19W for stabilization. It will breed at high density.

(Fifth embodiment)
Next, FIG. 5 shows a fifth embodiment of the exhaust gas treatment apparatus of the present invention. The fifth embodiment includes an upper watering part 19X instead of the upper watering part 19 in FIG. 1, and a lower second water tank 23X instead of the lower second water tank 23 of the lower water tank part 20 in FIG. This is different from the first embodiment described above. Therefore, in the fifth embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, detailed description thereof will be omitted, and parts different from those in the first embodiment will be described.

  As shown in FIG. 5, in the fifth embodiment, the upper watering part 19 </ b> X includes an upper filler part 28 that is a first filler part, a lower filler part 30 that is a second filler part, and an upper filler. A space 29 is provided between the portion 28 and the lower filler portion 30.

  The upper filler part 28 has the plastic filler 8 installed on the first porous plate 9A. The first porous plate 9 </ b> A is installed above the exhaust inlet 1. Moreover, the space part 29 does not have a filler. Further, the lower filler portion 30 has a ring-shaped polyvinylidene chloride filler 15 disposed below the exhaust inlet 1, and this ring-shaped polyvinylidene chloride filler 15 is installed on the second porous plate 9B. ing. On the other hand, the lower second water tank portion 23X of the lower water tank portion 20 does not have a filler.

  In this 5th Embodiment, the washing water containing the micro nano bubble from the lower water tank part 20 is sprinkled by the ring-like polyvinylidene chloride filler 15 installed in the lower filler part 30 which the upper watering part 19X has. The activated microorganisms propagate in the ring-type polyvinylidene chloride filler 15. The activated microorganisms microbially decompose volatile organic compounds in the exhaust gas.

  On the other hand, since the lower second water tank 23X is not filled with a filler, the microorganisms are in a fluid state in the lower second water tank 23X. Therefore, the microorganisms contained in the washing water introduced from the lower second water tank 23X to the upper watering part 19X are added to the ring-type polyvinylidene chloride filler 15 of the lower filler part 30 of the upper watering part 19X for stabilization. It will breed intensively and densely.

  Further, in the fifth embodiment, the lower filler part 30 below the space part 29 does not hinder the flow of exhaust gas from the space part 29 to the upper filler part 28 above, so the upper part from the space part 29 The exhaust gas can be efficiently introduced into the filler portion 28 to facilitate the exhaust gas treatment in the upper filler portion 28. In place of the ring-type polyvinylidene chloride filler 15, a string-type polyvinylidene chloride filler may be adopted.

(Sixth embodiment)
Next, FIG. 6 shows a sixth embodiment of the exhaust gas treatment apparatus of the present invention. In the sixth embodiment, only the introduction pipe 60 for introducing treated water from a domestic wastewater treatment facility (not shown) is provided in the lower water tank section 20 of the exhaust gas treatment apparatus of FIG. Different from form. Therefore, in the sixth embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, detailed description thereof will be omitted, and parts different from those in the first embodiment will be described.

  As shown in FIG. 6, in the sixth embodiment, treated water from domestic wastewater treatment equipment is introduced from the introduction pipe 60 to the lower water tank section 20. The treated water from this domestic wastewater treatment facility contains a trace amount of minerals such as magnesium, potassium, calcium, and iron necessary for microorganisms. Therefore, by adding the treated water from the domestic wastewater treatment facility to the washing water in the lower water tank section 20, the activity of microorganisms contained in the washing water is further increased, and the removal performance of volatile organic compounds is further increased. Will be.

  In addition, if minerals such as magnesium, potassium, calcium, and iron necessary for microorganisms are contained, instead of the treatment water of the above-mentioned domestic wastewater treatment facility, the treatment water such as food wastewater is supplied from the introduction pipe 60 to the lower water tank section. Of course, it may be introduced into 20.

(Experimental example)
An experimental device corresponding to the exhaust gas treatment device 3 shown in FIG. 1 was manufactured. The total capacity of the exhaust gas treatment apparatus 3 in this experimental apparatus is 4 m ³ , the capacity of the lower first water tank 18 inside the exhaust gas treatment apparatus 3 is 0.5 m ^3, and the capacity of the lower second water tank 23 is 1 m ^3. An experimental device was made. An acetone-containing exhaust gas was introduced into this experimental apparatus, and a trial operation for about one month was performed. After this test operation, the acetone concentration at the exhaust inlet 1 and the acetone concentration at the exhaust outlet 4 were measured, and the removal rate of acetone was measured. The removal rate was 88%.

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.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exhaust inlet 2 Exhaust fan 3 Exhaust gas processing device 4 Exhaust outlet 5 Sprinkling nozzle 6 Washing water piping 7 Sprinkling pump 8 Plastic filler 9, 9A, 9B Perforated plate 10 Circulation pump 11 Air suction pipe 12 Valve 13 Micro nano bubble generator 14 Micro Nanobubble flow 15 Ring-type polyvinylidene chloride filler 16 Ami 17 Charcoal 18 Lower first water tank 19, 19W, 19X Upper watering part 20 Lower water tank part 21 Fixing bracket 22 String-like polyvinylidene chloride fillers 23, 23U, 23V, 23W, 23X Lower second water tank 24 Urea metering pump 25 Urea tank 26 Phosphoric acid metering pump 27 Phosphoric acid tank

Claims (14)

Cleaning exhaust gas containing volatile organic compounds with cleaning water;
A step of causing the washing water containing the volatile organic compound generated by the washing treatment to contain micro / nano bubbles by a micro / nano bubble generator and generating microorganisms in the washing water to microbially treat the volatile organic compound;
And a step of treating the exhaust gas containing the volatile organic compound with the washing water containing the micro-nano bubbles and the microorganisms. The exhaust gas treatment method according to claim 1,
An exhaust gas treatment method, wherein the washing water has a microorganism concentration of 300 ppm or more by MLSS. A cleaning section for cleaning exhaust gas containing volatile organic compounds with cleaning water;
Washing water containing the volatile organic compound is introduced from the washing unit, and the washing water containing the volatile organic compound has a micro / nano bubble generator that contains micro / nano bubbles and the washing water containing the micro / nano bubbles. An exhaust gas treatment apparatus comprising: a washing water treatment unit that contains microorganisms and introduces the washing water containing the micro-nano bubbles and the microorganisms into the washing unit. The exhaust gas treatment apparatus according to claim 3,
The washing water treatment unit
An exhaust gas treatment apparatus, wherein the washing water contains 300 ppm or more microorganisms by MLSS. The exhaust gas treatment apparatus according to claim 3,
The cleaning unit is an upper watering unit that sprays the cleaning water onto the exhaust gas containing the volatile organic compound to clean the exhaust gas.
The cleaning water treatment unit is configured such that the cleaning water containing the volatile organic compound is introduced from the upper watering unit by natural fall and the cleaning water containing the volatile organic compound, micro-nano bubbles and microorganisms is supplied to the upper watering unit. An exhaust gas treatment apparatus, which is a lower water tank section having a watering pump to be fed to The exhaust gas treatment apparatus according to claim 5,
The lower tank part is
A lower first water tank in which the micro-nano bubble generator is installed;
An exhaust gas treatment apparatus comprising a lower second water tank in which the watering pump is installed. The exhaust gas treatment apparatus according to claim 3,
A urea addition unit for adding urea to the washing water of the washing water treatment unit;
An exhaust gas treatment apparatus comprising: a phosphoric acid addition unit that adds phosphoric acid to the cleaning water of the cleaning water treatment unit. The exhaust gas treatment apparatus according to claim 3,
An exhaust gas treatment apparatus comprising a domestic treatment water addition section for adding treated water from a domestic wastewater treatment apparatus to the washing water of the washing water treatment section. The exhaust gas treatment apparatus according to claim 6,
The upper watering part has a plastic filler,
The lower second water tank of the lower water tank portion has a polyvinylidene chloride filler. The exhaust gas treatment apparatus according to claim 9,
The lower second water tank has a string-type polyvinylidene chloride filler or a ring-type polyvinylidene chloride filler. The exhaust gas treatment apparatus according to claim 6,
An exhaust gas treatment apparatus, wherein charcoal is installed in the lower second water tank. The exhaust gas treatment apparatus according to claim 5,
The upper watering part is
An exhaust gas treatment apparatus comprising a plastic filler and a polyvinylidene chloride filler. The exhaust gas treatment apparatus according to claim 5,
The upper watering part is
A space into which the exhaust gas is introduced;
A first filler portion disposed above the space portion and having a plastic filler;
A second filler portion disposed below the space portion and having a polyvinylidene chloride filler;
The exhaust gas processing apparatus, wherein the space portion and the first and second filler portions communicate with each other. The exhaust gas treatment apparatus according to claim 11,
The exhaust gas treatment apparatus according to claim 1, wherein the charcoal is at least one of activated carbon, Bincho charcoal, and synthetic charcoal.

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