JP2006289344A - Exhaust gas treatment device and exhaust gas treatment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust gas treatment device and an exhaust gas treatment method at a highly efficient rate and a low cost. <P>SOLUTION: The exhaust gas treatment device and the exhaust gas treatment method dispose of offensive odor by a first slurry and a second slurry of two kinds. A calcium slurry from a catalytic oxidation tank 30 containing oyster husks 31 in a first wastewater treatment device 28 emitting the offensive odor is introduced into a middle-stage section 11B in a scrubber 11. In addition, a high-concentration microorganism sludge from a second nitrification tank 20 in a second wastewater treatment device 29 disposing of the offensive odor is introduced into an upper-stage section 11A in the scrubber 11. This allows the offensive odor to be efficiently treated by both the calcium sludge containing minerals deriving from the oyster husks 31 and the high-concentration microorganism sludge. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an exhaust gas treatment device and an exhaust gas treatment method. As an example, the present invention relates to the regulation of the total amount of nitrogen by the partial amendment of the Water Pollution Control Law, which was enforced from April 2004, and The present invention relates to an exhaust gas treatment device and an exhaust gas treatment method corresponding to emission reduction.

  In addition, the present invention treats two types of wastewater, for example, wastewater containing aminoethanol and dimethylsulfoxide mainly discharged from a semiconductor factory and high-concentration nitrogen wastewater (high-concentration ammonia wastewater, development wastewater, and dimethylformamide wastewater). The present invention relates to an exhaust gas treatment device and an exhaust gas treatment method. Aminoethanol corresponds to the PRTR method type 1 designated chemical substance. Further, as an example, the present invention provides an exhaust gas treatment device and an exhaust gas treatment capable of treating malodor generated from a waste water treatment device and reducing initial cost, running cost and maintenance cost when waste water containing dimethyl sulfoxide is treated. Regarding the method.

  Conventionally, methods for treating bad odor containing sulfur generated from wastewater treatment equipment include (1) direct combustion method by incineration, (2) adsorption method by activated carbon in activated carbon tower, and (3) oxidizing agents such as sodium hypochlorite. (4) Absorbent method that uses water or water containing sludge as an absorbent.

  However, these methods are not satisfactory because of their merits and demerits in terms of malodor treatment performance, initial cost, running cost, and maintenance cost.

Especially, (1) direct combustion method by incineration, (2) activated carbon tower adsorption method by activated carbon,
In the chemical treatment method using an oxidizing agent such as sodium hypochlorite (3) and (3), there is a problem that the running cost is high.

  On the other hand, the absorption method using water (4) including water and sludge (chemical sludge and biological sludge) as an absorbent has a problem of low odor treatment performance.

  Liquid dispersion types using absorbents with water containing this (4) water and sludge (chemical sludge and biological sludge) include (i) spray tower, (ii) cyclone scrubber, (iii) venturi scrubber (iv) There are jet scrubbers.

  The spray tower (i) is a system in which an absorbing liquid is sprayed and brought into contact with malodorous gas, and is characterized by a simple structure and low pressure loss. Moreover, the cyclone scrubber of (ii) is a system in which the absorbing liquid is sprayed and brought into contact with the malodorous gas swirling and rising in the tower in the radial direction, and the structure is relatively simple. The venturi scrubber of (iii) is a system in which a venturi tube is inserted into the malodorous gas inlet, and the absorbing solution is sprayed into the malodorous gas flowing in the tube from around the throat part. There are features that can be processed. The jet scrubber (iv) is characterized in that the absorbing liquid is sprayed from the nozzle at a high pressure and the bad odor gas is sucked by the action, so that a blower is unnecessary.

  Incidentally, another conventional technique is described in Patent Document 1 (Japanese Patent Laid-Open No. 2001-70950). As described in the title of the invention, this prior art is “treatment method and apparatus for waste water containing dimethyl sulfoxide” and describes the treatment of waste water containing dimethyl sulfoxide. This conventional technology includes dimethyl sulfoxide containing wastewater containing dimethyl sulfoxide in a semiconductor manufacturing plant, etc., which can selectively oxidize dimethyl sulfoxide to dimethyl sulfone without oxidizing the coexisting organic matter. A wastewater treatment method and treatment apparatus.

  That is, this prior art discloses a treatment method for adjusting the pH of waste water to 9 to 14 and adding hydrogen peroxide water in a treatment method for waste water containing dimethyl sulfoxide. Moreover, this prior art discloses a treatment method in which dimethyl sulfoxide-containing wastewater and hydrogen peroxide-containing wastewater are mixed and the pH of the mixed wastewater is adjusted to 9-14. Moreover, this prior art discloses a treatment apparatus having a mechanism for adjusting the pH of dimethylsulfoxide-containing wastewater to 9 to 14 and a mechanism for adding hydrogen peroxide. Furthermore, this prior art discloses a treatment apparatus having a mechanism for mixing dimethyl sulfoxide-containing wastewater and hydrogen peroxide-containing wastewater and a mechanism for adjusting the pH of the mixed wastewater to 9-14. However, this prior art does not describe the treatment of malodorous gas.

  Still another prior art is described in Patent Document 2 (Japanese Patent Laid-Open No. 2002-186829). As described in the title of the invention, this prior art is “Odor gas deodorization method and apparatus”, and describes the treatment of malodor gas. This prior art is a method for biologically deodorizing malodorous gas by bringing it into contact with a packed bed to which microorganisms that decompose malodorous components are attached. In this packed bed, humic substances, magnesium salts and It discloses that a filler composed of silicate, or a filler composed of humic substance, magnesium salt and silicate and an inorganic filler are used in combination. In addition, this prior art is preferably applied to volatile organic substances as the malodorous component, and if the pressure loss of the packed bed exceeds a specified value during the deodorizing treatment, the packed bed contains malodorous gas. No air is passed through and the amount of sludge in the packed bed is reduced.

By the way, there is a need for an exhaust gas treatment device and an exhaust gas treatment method that can efficiently treat malodor containing sulfur from the waste water treatment device and that can keep initial costs, running costs, and maintenance costs low.
JP 2001-70950 A JP 2002-186829 A

  Therefore, an object of the present invention is to provide an exhaust gas treatment apparatus and an exhaust gas treatment method that are highly efficient and low in cost.

  In order to solve the above problems, the exhaust gas treatment method of the present invention is characterized by treating malodorous gas with a plurality of types of sludge.

  According to the exhaust gas treatment method of the present invention, by treating malodorous gas with a plurality of types of sludge having different properties, it is possible to treat malodorous gas as compared with the case of treating malodorous gas with a single type of sludge. Will improve.

  In addition, an exhaust gas treatment apparatus according to an embodiment includes an exhaust gas treatment unit into which malodorous gas is introduced, and a sludge introduction unit that introduces a plurality of types of sludge into the exhaust gas treatment unit.

  According to the exhaust gas treatment apparatus of this embodiment, by introducing malodorous gas and a plurality of types of sludge having different properties into the flue gas treatment section, the malodorous gas is treated with a single type of sludge by treating the malodorous gas. Compared with the case of processing, malodorous gas can be processed efficiently.

  In one embodiment, the sludge contains at least two types of microbial sludge.

  According to the exhaust gas treatment apparatus of this embodiment, since microbial sludge is used as the sludge for treating malodorous gas, for example, microbial sludge from a biological treatment apparatus can be used effectively, and running costs can be reduced. The malodorous gas may be treated with microbial sludge and sludge not containing microorganisms.

Further, in the exhaust gas treatment apparatus of one embodiment, a first wastewater treatment apparatus having a contact oxidation tank filled with oyster shells and a subsequent precipitation tank of the contact oxidation tank,
A first sludge introduction section for introducing the first sludge from the settling tank of the first waste water treatment apparatus into the exhaust gas treatment section;
A second wastewater treatment device having a microorganism treatment tank containing a submerged membrane;
A second sludge introduction section for introducing the second sludge from the microorganism treatment tank of the second waste water treatment apparatus into the exhaust gas treatment section.

  In the exhaust gas treatment device of this embodiment, the first sludge introduction unit introduces the first sludge of the contact oxidation tank including the oyster shell of the first waste water treatment device to the exhaust gas treatment unit. Further, the second sludge introduction unit introduces the second sludge from the microorganism treatment tank of the second waste water treatment apparatus into the exhaust gas treatment unit. Thereby, in this embodiment, malodorous gas can be efficiently treated with both the sludge containing minerals derived from oyster shells and the sludge containing microorganisms from the microorganism treatment tank. Moreover, the said 1st, 2nd waste water treatment apparatus can utilize the existing waste water treatment equipment, and can reduce a running cost by utilizing the sludge of the existing waste water treatment equipment effectively.

  In addition, when the said microbial sludge contains activated carbon, the processing performance with respect to malodorous gas improves especially. Moreover, when spraying the sludge containing microorganisms from a piping nozzle, it discovered that the processing capability with respect to malodorous gas improved rather than the case of normal microorganisms density | concentration.

  Moreover, in the exhaust gas treatment apparatus of one embodiment, the exhaust gas treatment unit treats the malodorous gas with the first sludge, and further treats the treated malodorous gas with the second sludge.

  According to the exhaust gas treatment apparatus of this embodiment, the malodorous gas is treated with the first sludge derived from the scraper of the first wastewater treatment apparatus (pretreatment), and then the microorganisms of the second wastewater treatment apparatus The malodorous gas is treated with the second sludge containing microorganisms from the treatment tank (post-treatment). Thus, it discovered that the processing performance of malodorous gas improved by the front | former stage process by the 1st sludge, and the back | latter stage process by the 2nd sludge containing microorganisms.

  In the exhaust gas treatment method of one embodiment, the malodorous gas is a malodorous gas containing sulfur that is generated when denitrification is performed on wastewater containing aminoethanol and dimethyl sulfoxide.

  According to the exhaust gas treatment method of this embodiment, by using multiple types of sludge, it is possible to treat malodorous gas containing sulfur, which has been said to be difficult to treat in the past, with sludge instead of using a combustion or chemical method. Cost can be reduced. In addition, when the waste water containing aminoethanol and dimethyl sulfoxide was denitrified, it was confirmed by experiments that malodor containing sulfur was generated. The malodorous gas was a sulfur compound generated by biodegrading methyl sulfoxide.

  Further, in the exhaust gas treatment apparatus of one embodiment, the malodorous gas is generated from a wastewater treatment apparatus having a nitrification tank in which a wastewater containing aminoethanol and dimethylsulfoxide is introduced and a denitrification tank and a submerged film are installed. It is a bad odor gas containing sulfur.

  According to the exhaust gas treatment apparatus of this embodiment, the malodorous gas containing sulfur generated from the waste water treatment apparatus containing aminoethanol and dimethyl sulfoxide is treated. Therefore, according to this embodiment, the malodor from the wastewater containing aminoethanol and dimethyl sulfoxide can be treated, and the wastewater can be completely treated without causing pollution.

  In the exhaust gas treatment apparatus of one embodiment, at least one of the plurality of types of sludge contains activated carbon.

  According to the exhaust gas treatment apparatus of this embodiment, since the sludge for treating malodorous gas contains activated carbon, the treatment efficiency for the malodorous gas is improved.

  Moreover, in the exhaust gas treatment apparatus of one embodiment, at least one of the plurality of types of sludge contains mineral.

  According to the exhaust gas treatment apparatus of this embodiment, since the sludge for treating the malodorous gas contains minerals, the activity of microorganisms in the sludge is increased and the malodor treatment ability is improved.

  In the exhaust gas treatment apparatus of one embodiment, the second waste water treatment apparatus is a waste water treatment apparatus for treating nitrogen waste water, and the microorganism treatment tank including the submerged film is a nitrification tank.

  According to the exhaust gas treatment apparatus of this embodiment, the microorganism treatment tank including the submerged membrane is a nitrification tank, and the second sludge from the second wastewater treatment apparatus that treats nitrogen wastewater is used for the treatment of malodorous gas. ing. Therefore, the second waste water treatment apparatus is used for both exhaust gas treatment and waste water treatment, and there is an effect that the initial cost can be reduced.

  In one embodiment, the nitrification tank has a lower semi-anaerobic part and an upper aerobic part.

  According to the exhaust gas treatment apparatus of this embodiment, the sludge obtained from the waste water treatment apparatus is sludge from a nitrification tank having a lower semi-anaerobic part and an upper aerobic part. It will contain a wide range of anaerobic microorganisms and will be able to effectively treat malodorous gases.

  In the exhaust gas treatment method of one embodiment, the malodorous gas is a gas containing a volatile organic compound.

  According to the exhaust gas treatment method of this embodiment, by treating the malodorous gas containing the volatile organic compound with a plurality of types of sludge, compared to the case of treating the malodorous gas with a single type of sludge, The processing capacity of malodorous gas is improved.

  In the exhaust gas treatment apparatus of one embodiment, the malodorous gas is a gas containing a volatile organic compound.

  According to the exhaust gas treatment apparatus of this embodiment, a plurality of types of sludge having different properties are introduced into the exhaust gas treatment unit, and malodorous gases containing volatile organic compounds are treated by the plurality of types of sludge having different properties. Compared with the case where malodorous gas is treated with a single type of sludge, the malodorous gas containing volatile organic compounds can be treated efficiently.

  In the exhaust gas treatment method of one embodiment, the sludge is sludge containing micro-nano bubbles.

  In one embodiment, the sludge is sludge containing micro / nano bubbles.

  According to the exhaust gas treatment apparatus of this embodiment, the malodorous component of the malodorous gas can be efficiently adsorbed by the adsorption action of the micro / nano bubbles contained in the sludge, so that the treatment capacity of the malodorous gas is improved. Further, as an example, when the sludge contains microorganisms, the microorganisms are activated by the micro-nano bubbles, so that the malodorous gas component can be efficiently decomposed by the activated microorganisms.

  Micro-nano bubbles are bubbles containing both micro-bubbles (diameter 50 microns or less) and nano-bubbles (diameter 1 micron or less). According to the micro-nano bubble, it is considered to have a function of raising and maintaining dissolved oxygen in water. Further, since nanobubbles are bubbles having a diameter of 1 micron or less, it is considered that there is a direct action on living organisms at the cellular level, and in particular increases the activity of microorganisms. Further, typical functions of the micro / nano bubbles include a surface active action, a dirt component adsorption function, a high-speed washing function of an object surface, and a catalytic function.

  In one embodiment of the exhaust gas treatment method, the volatile organic compound contained in the malodorous gas includes at least one of isopropyl alcohol, acetone, and butyl acetate.

  In one embodiment, the volatile organic compound contained in the malodorous gas includes at least one of isopropyl alcohol, acetone, and butyl acetate.

  According to the exhaust gas treatment apparatus of this embodiment, the malodorous gas contains at least one of isopropyl alcohol, acetone, and butyl acetate as a component, so that the malodorous gas component can be easily decomposed by microorganisms.

  According to the exhaust gas treatment method of the present invention, by treating malodorous gas with a plurality of types of sludge, the processing capacity of malodorous gas can be improved as compared with the case of treating malodorous gas with a single type of sludge. .

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

(First embodiment)
FIG. 1 schematically shows an exhaust gas wastewater treatment system as a first embodiment of the exhaust gas treatment apparatus of the present invention.

  The exhaust gas wastewater treatment system of the first embodiment includes a first wastewater treatment device 28, a second wastewater treatment device 29, and a scrubber 11 as an exhaust gas treatment unit.

  First, the first wastewater treatment device 28 that is a wastewater treatment device that generates malodorous gas will be described. The waste water treatment device 28 includes a first denitrification tank 1, a first nitrification tank 6, a contact oxidation tank 30, and a precipitation tank 32. Drainage containing aminoethanol and dimethyl sulfoxide is introduced into the lower part of the first denitrification tank 1. Thereby, due to gravity, toxic aminoethanol-containing wastewater is introduced into the lower part of the first denitrification tank 1 where the microorganism concentration is higher than that at the upper part, and the stimulation to microorganisms is reduced. This is suitable for microbial treatment.

  The first denitrification tank 1 is introduced with biologically treated water or sludge generated by biological treatment. This biologically treated water or sludge generated by biological treatment contains trace elements such as phosphorus, potassium, calcium, and magnesium, and this trace element promotes the activity of microorganisms in all tanks. . In particular, in the high-concentration microbial treatment by the submerged membrane 7 in the first nitrification tank 6, the microbial treatment is stabilized because the trace elements are contained in the water to be treated.

  The first denitrification tank 1 is provided with a stirrer 2 for stirring the inside of the tank. The stirrer 2 can efficiently mix the waste water containing aminoethanol and dimethyl sulfoxide with anaerobic microorganisms. This agitator 2 may be an underwater agitator installed in water instead of a normal agitator.

  However, since the microorganism concentration in the first denitrification tank 1 is as high as 10000 ppm in MLSS (Mixed Liquor Suspended Solid), a part that cannot be stirred in the first denitrification tank 1 with this agitator 2 alone is a so-called dead space. Can do. Therefore, circulating agitation by the air lift pump 3 is performed. That is, a large amount of return sludge containing microorganisms from the lower part of the first nitrification tank 6 is introduced into the upper part of the first denitrification tank 1 by the air lift pump 3. In the air lift pump 3, a diffuser pipe 5A is installed in the lower end portion of the vertical pipe 3A. The air diffuser 5A is connected to the blower 16. The air supplied from the blower 16 is discharged from the air diffuser 5A in the vertical pipe 3A, and the return sludge containing microorganisms is discharged from the lower part in the pipe 3A by the upward flow. Move to the upper part of the pipe 3A.

  Next, the waste water containing aminoethanol and dimethyl sulfoxide introduced into the first denitrification tank 1 is anaerobically treated and then naturally flows from the upper part of the first denitrification tank 1 in the first nitrification tank 6. It is introduced into the lower semi-anaerobic part 23. In the first nitrification tank 6, a submerged film 7 </ b> A is installed in the upper aerobic part 24. Thereby, the microorganisms remain in the first nitrification tank 6 or are returned to the first denitrification tank 1 by the air lift pump 3. The transfer of the returned sludge by the air lift pump 3 is a method using air, and a large amount of returned sludge can be transferred with less power. That is, an energy-saving sludge transfer system. In general, the pumping pump system can secure a large head, but requires more power than the air lift pump system. That is, it is not an energy-saving transfer method.

  The microbial sludge returned from the first nitrification tank 6 to the first denitrification tank 1 by the air lift pump 3 returns from the first denitrification tank 1 to the first nitrification tank 6 and circulates again. By circulating the microbial sludge in both tanks, the microbial concentration in both tanks is maintained at substantially the same concentration. As described above, if the microorganism concentration is as high as 10000 ppm or higher in MLSS (Mixed Liquor Suspended Solid), a normal agitator or underwater agitator will generate a dead space that cannot be agitated. Agitation is carried out.

  The microorganism concentration in both the first denitrification tank 1 and the first nitrification tank 6 is maintained at 10000 ppm or more by MLSS (Mixed Liquor Suspended Solid). In addition, in the 1st denitrification tank 1, in order to measure the anaerobic degree, the oxidation-reduction potentiometer (not shown) is installed. In the first denitrification tank 1, nitrate nitrogen introduced from the first nitrification tank 6 by the air lift pump 3 is converted into aminoethanol as an alternative to methanol, which is a general hydrogen donor, by anaerobic microorganisms. In the presence, it is reduced to nitrogen gas. This nitrate nitrogen is one in which aminoethanol is decomposed by microorganisms in the first nitrification tank 6 and changed to nitrate nitrogen. Further, in the first denitrification tank 1, organic substances other than aminoethanol are biologically decomposed by anaerobic microorganisms.

  Next, the to-be-processed water which flowed out from the inside of the 1st denitrification tank 1 is introduce | transduced into the semi-anaerobic part 23 of the lower part of the 1st nitrification tank 6. FIG. Here, the anaerobic part is a state in which there is no dissolved oxygen, the aerobic part is a state in which the dissolved oxygen is maintained at several ppm, and the semi-anaerobic part is 0 ppm of dissolved oxygen or dissolved oxygen. Even if it exists, it is defined as about 0.5 ppm. In the first nitrification tank 6, a separation wall 4 </ b> A for separating the upper aerobic part 24 and the lower semi-anaerobic part 23 of the first nitrification tank 6 is installed on the side surface. The separation wall 4 may be constructed of concrete or steel. That is, the material of the separation wall 4A is not limited. However, when it is made of steel, when used for a long period of time, it is necessary to keep the coating firmly in order to prevent corrosion. In the separation wall 4A, a water flow is generated by the air discharged from the air diffusing pipe 5B in the upper aerobic portion 24 of the first nitrification tank 6, but the water flow has some influence on the lower semi-anaerobic portion 23. But not more. Since the microorganism concentration in the first nitrification tank 6 is high, the influence of the aerobic part 24 on the semi-anaerobic part 23 is minimized even with the separation wall 4A having a size as shown in FIG. It can be.

  Further, in the circulation system by the air lift pump 3 between the first denitrification tank 1 and the first nitrification tank 6, the semi-anaerobic portion 23 is provided at the lower part of the first nitrification tank 6. The anaerobic microorganisms that move to the first nitrification tank 6 together with the water to be treated treated with the anaerobic microorganisms are introduced into the aerobic part 24 through the semi-anaerobic part 23. Thereby, compared with the case where the anaerobic microorganisms from the first denitrification tank 1 are directly (straight) introduced into the aerobic part 24, the environmental stress on the anaerobic microorganisms moving to the first nitrification tank 6 is reduced. The efficiency when treating nitrogen with anaerobic microorganisms can be improved.

  Moreover, in the semi-anaerobic part 23 in the lower part of the first nitrification tank 6, specific microorganisms propagate, and the treated water is treated not only by anaerobic microorganisms and aerobic microorganisms but also by various microorganisms that propagate in the semi-anaerobic part 23. And overall microbial treatment efficiency can be improved. Moreover, it discovered that the microorganisms which propagate in the semi-anaerobic part 23 are useful for the reduction | decrease of sludge. In this semi-anaerobic part 23, since aeration equipment is not installed, it is not aerated, but under the influence of some water flow in the upper aerobic part 24 being aerated, dissolved oxygen which is a condition of the semi-anaerobic part Is 0 ppm, or about 0.5 ppm even if dissolved oxygen is present. Thereby, in the semi-anaerobic part 23, semi-anaerobic property can be maintained.

  In the air lift pump 3, the vertical pipe 3A is installed from the semi-anaerobic part 23 to the aerobic part 24 of the first nitrification tank 6. In the air lift pump 3, the air supplied from the blower 16 moves up and down. When the interior of the vertical pipe 3 </ b> A extending to the bottom is raised, the return sludge is also lifted and transferred at the same time. Although this air lift pump 3 can secure only a small head, a large amount of return sludge can be transferred to the first denitrification tank 1 with less electric power than a pressure pump. By transferring this large amount of returned sludge to the first denitrification tank 1, it is useful for stirring in the water tank of the first denitrification tank 1. The sludge transferred from the lower part of the first nitrification tank 6 to the first denitrification tank 1 by the air lift pump 3 has a microorganism concentration as high as 10,000 ppm in MLSS (Mixed Liquor Suspended Solid). Even if it is supplied, oxygen is consumed immediately, and anaerobic properties can be maintained in the upper part of the first denitrification tank 1.

  Further, in the aerobic part 24 at the upper part of the first nitrification tank 6, an air diffuser 5B for air cleaning the submerged film 7A is installed below the submerged film 7A. The air supply to the air diffusing pipe 5B is performed by the discharge air from the blower 16. In addition, as the submerged membrane 7A, two types, a flat membrane type and a hollow fiber membrane, are commercially available.

  The treated water in the first nitrification tank 6 naturally flows out by gravity (water head difference) from the gravity pipe 9A connected to the submerged membrane 7A. Since the method using the gravity pipe 9A does not require electric power, an energy saving operation is possible. Further, when the submerged membrane 7A is blocked and the discharge amount from the gravity pipe 9A is reduced, treated water can be secured by operating the submerged membrane pump 8A connected to the submerged membrane 7A by the pipe. . In addition, as a method of utilizing the submerged membrane 7A, two types of gravity piping method and submerged membrane pump method are simultaneously employed for securing treated water, and a method for securing treated water is adopted by taking advantage of each advantage. Is more preferable from the viewpoint of safe driving. Further, when the amount of permeated water of the submerged membrane 7A decreases, that is, when the amount of treated water decreases, the submerged membrane 7A itself is washed with sodium hypochlorite or the like.

  Next, the water to be treated from the first nitrification tank 6 is introduced into the contact oxidation tank 30 via the gravity pipe 9A or the submerged membrane pump 8A. The contact oxidation tank 30 is filled with oyster shells 31 and, as the operation time elapses, a biofilm is formed on the surface of the oysters 31 and is useful for the treatment of residual organic matter in the water to be treated. . Moreover, when the inflow PH of the to-be-processed water to the contact oxidation tank 30 is acidified, the shavings 31 will melt | dissolve from the liquid relationship and eventually neutralize to-be-processed water. Become. The to-be-processed water which came out of this contact oxidation tank 30 flows into the precipitation tank 32 which has the lake 33, and a deposit and a liquid are separated into single liquids. The supernatant liquid from the precipitation tank 32 becomes the first treated water.

  On the other hand, the solid matter containing calcium sludge precipitated in the settling tank 32 is introduced into the scrubber 11 as the exhaust gas treatment section by the sludge pump 34 via the deodorizing sludge outbound pipe 12 and used as an odor gas absorbent. Used. The deodorized sludge forward piping 12 and the sludge pump 34 constitute a first sludge introduction section.

  Next, malodor generated in the waste water treatment apparatus 28 will be described.

  In the first denitrification tank 1 and the first nitrification tank 6 of the waste water treatment device 28, dimethyl sulfoxide in the water to be treated is decomposed to generate a sulfur compound. This sulfur compound becomes malodorous gas 14 and is released from the upper part of the first denitrification tank 1 and the first nitrification tank 6. Therefore, the first wastewater treatment device 28 has a lid portion 28A, and surrounds and covers the entire wastewater treatment device 28 that generates a bad odor with the lid portion 28A, and an exhaust pipe L1 and an exhaust fan connected to the lid portion 28A. 10, the malodorous gas 14 is introduced into the lower part 11 </ b> C of the scrubber 11.

  The scrubber 11 has an uppermost gas discharge portion 11F, an upper step portion 11A, a middle step portion 11B, and a lower step portion 11C. An upper piping nozzle 35 is installed on the upper portion 11A of the scrubber 11, and the deodorizing sludge outbound piping 12A-1, 12A-2, 12A-3 is connected to the upper piping nozzle 35. . The forward pipes 12A-1, 12A-2, 12A-3 reach the aerobic portion 26 at the upper part of the second nitrification tank 20 of the second wastewater treatment device 29 via the sludge pump 22. The deodorized sludge outbound pipes 12A-1, 12A-2, 12A-3 and the sludge pump 22 constitute a second sludge introduction section.

  Therefore, in this scrubber 11, first, the high concentration microorganisms are discharged from the upper pipe nozzle 35 via the deodorized sludge forward pipe 12A-1, 12A-2, 12A-3 from the waste water treatment device 29 for treating malodor. Sludge is sprayed. This high-concentration microbial sludge is a high-concentration microbial sludge with MLSS (Mixed Liquor Suspended Solid) of 10,000 ppm or more, and has a significantly higher malodor absorption performance than ordinary microbial sludge (a microbial sludge with MLSS of about 3000 ppm). This proved through experiments.

  Secondly, sludge in which activated carbon is mixed with calcium sludge precipitated in the settling tank 32 of the waste water treatment device 28 that generates the malodor is sprayed from the intermediate pipe nozzle 36 of the scrubber 11. This activated carbon is a line mixer in which activated carbon (powdered activated carbon, granular activated carbon, granular activated carbon, etc.) stirred by a stirrer 38 in an activated carbon water tank 37 is installed in a deodorizing sludge outbound pipe 12B by an activated carbon water pump 39. Activated carbon supplied to (not shown). This line mixer mixes the activated carbon with the calcium sludge precipitated in the settling tank 32 in the forward piping 12B. Needless to say, by mixing activated carbon with this calcium sludge, the deodorizing ability of the activated carbon improves the malodor treatment performance.

  Thus, in this scrubber 11, two types of absorbing liquids (water containing sludge) having a high odor treatment performance are sprayed from the upper pipe nozzle 35 and the middle pipe nozzle 36 to the upper stage 11A and the middle stage 11B of the scrubber 11. The

  The calcium sludge from the settling tank 32 is a calcium sludge derived from the oyster shell 31 which is a natural product filled in the contact oxidation tank 30, and since this kaki 31 is a natural product, Contains minerals. Since this calcium sludge contains various natural minerals, the microbial activity in this calcium sludge increases, and as a result, the malodor treatment capacity in the scrubber 11 is improved.

  Then, the two types of microbial sludge sprayed from the upper pipe nozzle 35 and the middle pipe nozzle 36 fall to the lower stage portion 11C of the scrubber 11 and absorb the malodorous component of the malodorous gas 14. Thereafter, the microbial sludge that has absorbed this malodorous component passes through the deodorizing sludge return pipe 13 connected to the lower stage 11C, and from the sludge introduction pipe 21 installed in the second nitrification tank 20 of the wastewater treatment device 29, It is introduced into the semi-anaerobic portion 25 below the second nitrification tank 20. This sludge introduction pipe 21 extends vertically from the upper aerobic part 26 of the second nitrification tank 20 to the lower semi-anaerobic part 25. In the semi-anaerobic portion 25, the malodor component absorbed by the microbial sludge is microbially decomposed. That is, sulfur is oxidized to sulfate ions, dissolved in the water to be treated, and finally discharged as one component of the second treated water to the outside of the factory.

  Thus, the malodorous gas 14 introduced into the scrubber 11 as the exhaust gas treatment unit from the exhaust pipe L1 by the exhaust fan 10 is treated by gas-liquid (gas and liquid) contact with water containing the above two types of microbial sludge. Then, the gas is discharged as the processing gas 15 from the uppermost gas discharge portion 11F of the scrubber 11.

  Next, the waste water treatment device 29 for treating malodor will be described in detail. The waste water treatment device 29 has a second denitrification tank 17 and a second nitrification tank 20.

  High concentration nitrogen drainage is introduced into the lower part of the second denitrification tank 17. Examples of the high-concentration nitrogen wastewater include high-concentration ammonia wastewater generated in a semiconductor factory, development waste liquid, and dimethylformamide waste liquid. The reason why this high-concentration nitrogen wastewater is introduced into the lower part of the second denitrification tank 17 is that the lower part of the second denitrification tank 17 has a higher microorganism concentration due to gravity than the upper part. By introducing the high-concentration nitrogen waste water into the lower part of the second denitrification tank 17, the stimulation for microorganisms is reduced, which is suitable for microbial treatment.

  The second denitrification tank 17 is introduced with biologically treated water or sludge generated by biological treatment. By introducing biologically treated water or sludge generated by biological treatment into the second denitrification tank 17, phosphorus, potassium, calcium, magnesium, etc. contained in the biologically treated water or sludge generated by biological treatment The trace elements will promote the activity of all the microorganisms in each tank.

  In particular, in the high-concentration microbial treatment using the submerged membrane 7B in the second nitrification tank 20, the treatment can be stabilized because trace elements are contained in the water to be treated. The second denitrification tank 17 is provided with a stirrer 18 for stirring the inside of the tank. In order to efficiently mix anaerobic microorganisms and high-concentration nitrogen wastewater, an underwater agitator installed in water may be used instead of a normal agitator. However, since the microorganism concentration in the second denitrification tank 17 is as high as 10,000 ppm in MLSS (Mixed Liquor Suspended Solid), a part of the second denitrification tank 17 that cannot be stirred is a so-called dead space. In order to cope with this, circulation agitation by the air lift pump 19 is performed. That is, a large amount of return sludge containing microorganisms from the lower part of the second nitrification tank 20 is introduced into the upper part of the second denitrification tank 17 by the air lift pump 19.

  The air lift pump 19 is provided with a diffuser pipe 5C in the lower end portion of the vertical pipe 19A. Air generated from the blower 16 is discharged from the diffuser pipe 5C in the pipe 19A, and returns sludge containing microorganisms by the upward flow. Moves from the lower part in the pipe 19A to the upper part in the pipe 19A. The sludge transferred from the lower part of the second nitrification tank 20 by the air lift pump 19 has a microorganism concentration as high as 10,000 ppm in MLSS (Mixed Liquor Suspended Solid). Therefore, since this sludge is transferred by air, even if oxygen is supplied to this sludge, oxygen is consumed immediately, so that anaerobic properties can be maintained in the upper part of the second denitrification tank 17.

  Next, the high-concentration nitrogen drainage introduced into the second denitrification tank 17 is anaerobically treated, and then naturally flows from the upper part of the second denitrification tank 17 to the semi-anaerobic portion 25 at the lower part of the second nitrification tank 20. To be introduced. In the second nitrification tank 20, the submerged membrane 7 </ b> B is installed, so that the microorganisms stay in the second nitrification tank 20 or are returned to the second denitrification tank 17 by the air lift pump 19. The transfer of the returned sludge by the air lift pump 19 is a method using air, and a large amount of returned sludge can be transferred with less power. That is, the air lift pump 19 is an energy saving pump. In general, a method using a pressure pump or the like can secure a large lift, but requires a lot of power as compared with an air lift pump method, and is not an energy-saving transfer method.

  The microbial sludge returned to the second denitrification tank 17 returns to the second nitrification tank 20 and circulates again. By circulating the microbial sludge in both tanks, the microbial concentration in both tanks is maintained at substantially the same concentration. As described above, when the microorganism concentration is as high as 10,000 ppm or more in MLSS (Mixed Liquor Suspended Solid), as a countermeasure against the occurrence of dead space that cannot be stirred with a normal stirrer or underwater stirrer, circulation by the air lift pump 19 is performed. Agitation is carried out. The microorganism concentration in both the second denitrification tank 17 and the second nitrification tank 20 is maintained at 10000 ppm or more by MLSS (Mixed Liquor Suspended Solid). In addition, in the 2nd denitrification tank 17, in order to measure the anaerobic degree, the oxidation-reduction potentiometer (not shown) is installed. In the second denitrification tank 17, nitrate nitrogen introduced from the second nitrification tank 20 by the air lift pump 19 is reduced to nitrogen gas by anaerobic microorganisms. This nitrate nitrogen is one in which the high-concentration nitrogen wastewater is decomposed by microorganisms in the second nitrification tank 20 and converted to nitrate nitrogen. Further, in the second denitrification tank 17, organic substances in the water to be treated are biologically decomposed by anaerobic microorganisms.

  Next, the treated water that has flowed out of the second denitrification tank 17 is introduced into the lower part of the second nitrification tank 20. This lower part has a semi-anaerobic part 25. Here, the anaerobic part is a part where there is no dissolved oxygen, the aerobic part is a state where the dissolved oxygen is maintained at several ppm, and the semi-anaerobic part is the dissolved oxygen is 0 ppm or dissolved. Even if oxygen is present, it is defined as about 0.5 ppm. On the inner wall side surface of the second nitrification tank 20, a separation wall 4B for separating the upper part (aerobic part 26) and the lower part (semi-anaerobic part 25) of the second nitrification tank 20 is installed. This separation wall 4B may be constructed of concrete or steel. That is, the material of the separation wall 4B is not limited. However, when the separation wall 4B is made of steel, it needs to be firmly coated for preventing corrosion when used for a long time.

  By installing the separation wall 4B, a water flow is generated by the air discharged from the diffuser pipe 5D in the aerobic portion 26 at the upper part of the second nitrification tank 20, but the water flow is directed to the lower semi-anaerobic part 25. To some extent, but not more. Since the microorganism concentration in the second nitrification tank 20 is high, the influence of the aerobic part 26 on the semi-anaerobic part 25 is minimized even with the separation wall 4B having a size as shown in FIG. can do.

  In the circulation system by the air lift pump 19 between the second denitrification tank 17 and the second nitrification tank 20, the semi-anaerobic portion 25 is provided at the lower part of the second nitrification tank 20. Anaerobic microorganisms that move together with the water to be treated treated with anaerobic microorganisms are introduced into the aerobic part 26 via the semi-anaerobic part 25. Thereby, the environmental stress with respect to the anaerobic microorganisms which move to the 2nd nitrification tank 20 can be decreased compared with the case where the said anaerobic microorganisms are directly introduced into the aerobic part 26 (straight). The one where there is little environmental stress with respect to anaerobic microorganisms can improve the efficiency at the time of processing nitrogen.

  In addition, microorganisms unique to the semi-anaerobic part 25 are propagated, and the treatment water is treated with various microorganisms that propagate not only to anaerobic microorganisms and aerobic microorganisms but also to the semi-anaerobic part 25, so that the efficiency of comprehensive microbial treatment is improved. Can be improved. Moreover, it discovered that the microorganisms which propagate in this semi-anaerobic part 25 are useful for the reduction | decrease of sludge by providing the semi-anaerobic part 25 in the 2nd nitrification tank 20. FIG.

  Since the semi-anaerobic portion 25 is not provided with aeration equipment, the semi-anaerobic portion 25 is not aerated. However, the semi-anaerobic portion 25 is semi-anaerobic due to the influence of some water flow in the aerobic portion 26 on the upper part. The dissolved oxygen, which is part of the conditions, is 0 ppm, or even if dissolved oxygen is present, it is about 0.5 ppm. Thereby, in the semi-anaerobic part 25, the semi-anaerobic property can be maintained.

  The second nitrification tank 20 is provided with an air lift pump 19 that spans the semi-anaerobic part 25 and the aerobic part 26. In the air lift pump 19, when the air discharged from the blower 16 rises inside the vertical pipe 19 </ b> A installed vertically, the return sludge also rises at the same time and is transferred to the second denitrification tank 17. The air lift pump 19 can secure a lower head than a pressure pump or the like, but can transfer a large amount of return sludge to the second denitrification tank 17 with less power. Since this air lift pump 19 can transfer a large amount of returned sludge to the second denitrification tank 17, it can also be used for stirring in the water tank of the second denitrification tank 17.

  In the aerobic portion 26 at the upper part of the second nitrification tank 20, an air diffuser 5D for air-washing the submerged membrane 7B is installed below the submerged membrane 7B. Air is supplied to the air diffusing pipe 5 </ b> D by air discharged from the blower 16. In addition, as the submerged membrane, two types, a flat membrane type and a hollow fiber membrane, are commercially available. The treated water from the second nitrification tank 20 naturally flows out by gravity from the gravity pipe 9B connected to the submerged film 7B. That is, the gravity pipe 9B uses the water head difference to derive treated water. Since the method using the gravity pipe 9B does not require electric power, energy saving operation is possible. Further, when the submerged membrane 7B is blocked and the discharge amount from the gravity pipe 9 is reduced, the treated water can be secured by operating the submerged membrane pump 8B connected to the submerged membrane 7B by the pipe. . As a method of utilizing this submerged membrane 7B, adopting a gravitational piping method and a submerged membrane pump method at the same time for securing treated water, making use of the respective advantages and securing a treated water, More preferable from the viewpoint of safe driving. When the amount of permeated water of the submerged membrane 7B decreases, that is, when the amount of treated water decreases, the submerged membrane 7B itself is washed with sodium hypochlorite or the like. The treated water from the second nitrification tank 20 is led out by the gravity pipe 9 or the submerged membrane pump 8 and becomes the second treated water.

  Next, the malodor treatment will be described. The microbial sludge in the aerobic part 26 in the upper part of the second nitrification tank 20 adsorbs substances that cause bad odors such as sulfur compounds, and can be decomposed by microorganisms after the adsorption. Therefore, the microbial sludge in the aerobic part 26 is passed by the sludge pump 22 through the deodorized sludge outbound pipes 12A-1, 12A-2, 12A-3 as the second sludge introduction part, and the upper pipe nozzle 35 of the scrubber 11 It is possible to partially absorb and decompose the malodorous component of the malodorous gas. That is, by spraying sludge from the upper piping nozzle 35 of the scrubber 11 to the upper portion 11A in a spray manner and bringing it into contact with malodorous gas, part of the malodorous substances such as sulfur compounds are adsorbed by the microbial sludge and microbial decomposition is performed. To do. In the scrubber 11, the sludge after the malodor causing substance is adsorbed and subjected to the microbial decomposition treatment is introduced into the upper part of the malodorous sludge introduction pipe 21 through the return pipe 13 for the deodorizing sludge. The sludge containing malodor introduced into the upper part of the malodorous sludge introduction pipe 21 is further moved to the lower part of the malodorous sludge introduction pipe 21 and then introduced into the semi-anaerobic portion 25. In the semi-anaerobic part 25, most of the causative substances of malodor are decomposed by microorganisms present in the semi-anaerobic part 25. The decomposed microbial sludge moves to the aerobic section 26 again and is introduced into the upper stage 11A of the scrubber 11 by the sludge pump 22 through the deodorizing sludge outbound pipes 12A-1, 12A-2, 12A-3. .

  That is, the microbial sludge circulates between the scrubber 11 and the aerobic part 26 and the semi-anaerobic part 25 of the second nitrification tank 20. By the circulation of the microbial sludge, the malodorous compound such as sulfur contained in the malodorous gas is adsorbed by the sludge, and is performed by the first stage decomposition by the scrubber 11 and the microorganisms of the semi-anaerobic part 25 and the aerobic part 26. It will be processed by the adsorption decomposition of the stage.

  In the first embodiment, malodorous gas is treated with two types of sludge: the first sludge from the first wastewater treatment device 28 and the second sludge from the second wastewater treatment device 29. The malodorous gas may be treated with two or more types of sludge from two or more wastewater treatment devices.

(Second embodiment)
Next, FIG. 2 shows an exhaust gas wastewater treatment system as a second embodiment of the exhaust gas treatment apparatus of the present invention.

  In the first embodiment described above, the second denitrification tank 17 included in the second waste water treatment device 29 and the aerobic part 26 and the semi-anaerobic part 25 of the second nitrification tank 20 were not filled with a filler. On the other hand, in the second embodiment, the second waste water treatment device 29N includes a vinylidene chloride filler as a filler in the aerobic portion 26N and the semi-anaerobic portion 25 of the second denitrification tank 17N and the second nitrification tank 20N. 27 is filled. 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.

  In the second embodiment, the aerobic part 26N and the semi-anaerobic part 25N of the second denitrification tank 17N and the second nitrification tank 20N are filled with the vinylidene chloride filler 27, thereby improving the nitrogen treatment efficiency in the high concentration nitrogen waste water. Can be raised. Thereby, in the second wastewater treatment device 29N, malodor-causing substances such as sulfur compounds can be efficiently decomposed.

  Thus, each tank is filled with the vinylidene chloride filler 27 in the aerobic part 26N and the semi-anaerobic part 25N of the second denitrification tank 17N and the second nitrification tank 20N, as compared with the state where there is no filler. When the entire tank is averaged at 17N and 20N, the microorganism concentration becomes high. In addition, microorganisms adhere to and propagate on each vinylidene chloride packing 27, so that the microorganisms are more stabilized and the treatment capacity for nitrogen and malodorous substances is improved as compared with a state where there is no packing. In addition, it is preferable to arrange | position the vinylidene chloride filling material 27 to the whole water tank of each tank 17N and 20N. In this case, the microorganism concentration is high in each tank.

  In the second wastewater treatment device 29N, microorganisms adhere to and propagate on each vinylidene chloride filling 27 with the passage of time from the trial run. The microbial concentration on the surface of the vinylidene chloride filling 27 becomes 30000 ppm or more, which leads to an improvement in the processing efficiency of nitrogen and malodorous components. The material of the vinylidene chloride filler 27 is vinylidene chloride which is strong and is not affected by chemical substances, and can be used semipermanently. Moreover, as this vinylidene chloride filling material 23, there are products such as biocode, ring lace, biomultileaf, biomodule, etc., but it may be selected according to the properties of the waste water. In the aerobic portion 26N of the second nitrification tank 20N of the second waste water treatment device 29N, ammonia nitrogen in the water to be treated is decomposed and oxidized by aerobic microorganisms to become nitrate nitrogen or nitrite nitrogen.

(Third embodiment)
Next, FIG. 3 shows an exhaust gas wastewater treatment system as a third embodiment of the exhaust gas treatment apparatus of the present invention.

  In the first embodiment described above, the first denitrification tank 1 and the first nitrification tank 6 of the first wastewater treatment apparatus 28 and the second denitrification tank 17 and the second nitrification tank 20 of the second wastewater treatment apparatus 29 are filled. The material was not filled. In contrast, in the third embodiment, the first denitrification tank 1N and the first nitrification tank 6N of the first wastewater treatment apparatus 28N, and the second denitrification tank 17N and the second nitrification tank of the second wastewater treatment apparatus 29N. 20N is filled with a vinylidene chloride filler 27 as a filler. Therefore, in the third embodiment, the same portions as those in the first embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and portions different from those in the first embodiment are described.

  In the third embodiment, the first denitrification tank 1N and the first nitrification tank 6N, and the second denitrification tank 17N and the second nitrification tank 20N are filled with the vinylidene chloride filler 27. Thereby, the decomposition | disassembly efficiency and nitrogen treatment efficiency of aminoethanol and dimethylsulfoxide can be raised with respect to the waste_water | drain containing aminoethanol and dimethylsulfoxide. Moreover, the nitrogen treatment efficiency with respect to high concentration nitrogen waste water can be raised.

  That is, by filling the first denitrification tank 1N and the first nitrification tank 6N, and the second denitrification tank 17N and the second nitrification tank 20N with the vinylidene chloride filler 27, each tank is compared with the state without the filler. When the concentration of microorganisms in the tank is averaged over the entire tank, the concentration becomes high. In addition, microorganisms adhere to and grow on each vinylidene chloride packing 27, and the microorganisms are more stabilized and the ability to decompose aminoethanol, dimethyl sulfoxide and nitrogen and the ability to treat nitrogen are improved compared to the case where there is no packing. To do. This vinylidene chloride filling 27 is preferably arranged in the entire water tank of each tank. In this case, the microorganism concentration is high in each tank. The presence of the vinylidene chloride packing 27 in each tank increases the anaerobic degree (measured by the oxidation-reduction potential) and promotes the denitrification reaction as compared to the state without the packing 27.

  In the exhaust gas wastewater treatment system including the first and second wastewater treatment devices 28N and 29N, microorganisms propagate in each vinylidene chloride filling 27 with the passage of time from the trial operation. The microbial concentration on the surface of the vinylidene chloride packing 27 becomes 30000 ppm or more, and the treatment capacity for aminoethanol, dimethyl sulfoxide and nitrogen compounds by various microorganisms is improved.

  The material of the vinylidene chloride filler 27 is vinylidene chloride which is strong and is not affected by chemical substances, and can be used semipermanently. The vinylidene chloride filling 27 includes products such as biocodes, ring laces, biomulti-leafs, biomodules, etc., and may be selected according to the properties of the waste water.

  Further, in the first denitrification tank 1N and the second denitrification tank 17, nitrate nitrogen in the for-treatment water returned from the first nitrification tank 6N and the second nitrification tank 20N is reduced by the air lift pump 3 and the air lift pump 19. Nitrogen gas is processed. In the first nitrification tank 6N and the second nitrification tank 20N, aminoethanol and ammoniacal nitrogen in the water to be treated are decomposed and oxidized by aerobic microorganisms to become nitrate nitrogen and nitrite nitrogen.

  In the first to third embodiments, the malodorous gas 14 from the first wastewater treatment devices 28 and 28N is introduced into the lower stage portion 11C of the scrubber 11 by the exhaust fan 10, but outside the first wastewater treatment devices 28 and 28N. The case where no volatile organic compound-containing exhaust gas is introduced into the scrubber 11 has been described. On the other hand, not only the malodorous gas generated by the exhaust fan 10 in the first waste water treatment devices 28 and 28N, but also the odorous gas 14 as well as the volatile organic compound as shown by a one-dot chain line in FIGS. May also be introduced into the lower part 11C of the scrubber 11 via the exhaust fan 10. In this case, it becomes a modification of the first to third embodiments. In this modified example, in the scrubber 11, not only the malodorous gas but also the malodorous gas containing the volatile organic compound can be efficiently treated by the microorganism-containing sludge sprayed from the upper piping nozzle 35 and the middle piping nozzle 36. In addition, in the process of the gas by microorganisms, the applicable range of the kind of gas which can be processed is wide, and the scrubber 11 can process many kinds of gas. Moreover, the gas containing a volatile organic compound may be a malodorous gas. Examples of the volatile organic compound include isopropyl alcohol, acetone, butyl acetate and the like. These isopropyl alcohol, acetone, and butyl acetate are relatively easily degraded by microorganisms. It should be noted that the volatile organic compound is not limited to these, and any of the so-called volatile organic compounds (VOC (Volatile Organic Compounds)) can be applied.

  Further, in this modified example, the deodorizing sludge outbound piping 12A-1, 12A-2, 12A-3 for introducing the microbial sludge of the aerobic portions 26, 26N into the scrubber 11 is connected to the piping 12A-2. Instead, deodorizing sludge outbound piping 47 and 48 indicated by a one-dot chain line in which the micro / nano bubble generating tank 44 is disposed. Therefore, in this modified example, the microbial sludge in the second nitrification tanks 20 and 20N of the second wastewater treatment device 29 that treats malodors passes through the deodorized sludge outbound piping 12A-3 and 48 by the sludge pump 22. Then, it is introduced into the micro / nano bubble generation tank 44.

A micro / nano bubble generator 41 is installed in the micro / nano bubble generation tank 44, and air from the air suction pipe 43 is introduced into the micro / nano bubble generator 41 while being adjusted by a valve 42. In addition, the sludge in the micro / nano bubble generation tank 44 is supplied to the micro / nano bubble generator 41 from the water supply pipe 46 by the circulation pump 40 at a pressure of, for example, 1.5 kg / cm ² or more. Since most of the sludge is water, the micro / nano bubble generator 41 efficiently generates micro / nano bubbles. Therefore, in the micro / nano bubble generation tank 44, the sludge and the micro / nano bubbles are mixed, and microorganisms in the sludge are activated.

  Microbial sludge containing micro / nano bubbles generated in the micro / nano bubble generation tank 44 is passed through the deodorizing sludge forward piping 47 and 12A-1 by the micro / nano bubble generation tank pump 45 at the upper stage 11A of the scrubber 11. Watered. Thus, in the scrubber 11, the microbial sludge containing the micro-nano bubbles is sprinkled from the upper portion 11A and brought into contact with a gas containing a malodorous gas or a volatile organic compound, thereby causing a malodorous component such as a sulfur compound or a volatile organic compound. Adsorbed with microbial sludge to partially decompose microorganisms. Since the microorganisms in the microbial sludge are activated by the micro / nano bubbles, the efficiency of gas treatment in the scrubber 11 is improved.

  In this scrubber 11, the sludge after adsorbing malodorous components and volatile organic compounds and partially decomposing the microorganisms is passed through a deodorizing sludge return pipe 13 connected to the lower part 11 C of the scrubber 11, and containing malodorous sludge. It is introduced into the upper part of the introduction pipe 21. The introduction pipe 21 extends in the vertical direction from the upper part to the lower part of the second nitrification tanks 20 and 20N.

  Therefore, the sludge containing the malodorous component and the volatile organic compound moves from the upper part of the introduction pipe 21 to the lower part of the introduction pipe 21 and is then introduced into the semi-anaerobic parts 25 and 25N, and the odor-causing substances by the microorganisms, Most of the volatile organic compounds are decomposed. The microbial sludge after decomposition of the odor-causing substances and volatile organic compounds is moved again to the aerobic parts 26, 26N, and the sludge pump 22 removes the deodorized sludge from the aerobic parts 26, 26N. -3, 48 and the micro / nano bubble generation tank 44, it is introduced into the upper part 11 </ b> A of the scrubber 11. That is, in the wastewater treatment devices 29 and 29N, the second nitrification tank 20 passes through the deodorizing sludge outbound pipes 12A-3 and 48, the micro / nano bubble generating tank 44, the outbound pipes 47 and 12A-1 and the return pipe 13. , 20N microbial sludge circulates between the aerobic parts 26, 26N, semi-anaerobic parts 25, 25N of the second nitrification tanks 20, 20N and the scrubber 11. By the circulation of the deodorizing sludge, malodorous compounds such as sulfur contained in the malodorous gas generated in the wastewater treatment devices 28 and 28N and volatile organic compounds contained in the exhaust gas containing volatile organic compounds are adsorbed by the deodorizing sludge. . The first stage partial decomposition in the scrubber 11 and the second stage most decomposition performed by the microorganisms activated by the sludge containing micro-nano bubbles in the semi-anaerobic parts 25, 25N and the aerobic parts 26, 26N. Will be processed.

(Experimental example)
An experimental apparatus having the same configuration as that of the second embodiment shown in FIG. 2 was manufactured. In this experimental apparatus, the capacity of the first denitrification tank 1 was 100 liters, and the capacity of the first nitrification tank 6 was 200 liters. The capacity of the second denitrification tank 17N was 100 liters, and the capacity of the second nitrification tank 20N was 200 liters. After the completion of microbial training for about two months in this experimental apparatus, the microbial concentration was 18700 ppm. Then, water to be treated having an aminoethanol concentration of 2860 ppm and a dimethylsulfoxide concentration of 1400 ppm was collected from the aminoethanol and dimethylsulfoxide-containing wastewater discharged from the production apparatus of the factory and continuously introduced into the first denitrification tank 1. Then, after waiting for the water quality to stabilize, the aminoethanol concentration of the treated water obtained from this experimental apparatus was 130 ppm, and the dimethyl sulfoxide concentration was 110 ppm.

  In addition, the malodorous gas generated from the first denitrification tank 1 and the first nitrification tank 6 of the wastewater treatment device 28 that generates malodor was at a level at which a person feels odor when approaching the experimental apparatus within 1 m. When treated with the scrubber 11, it was in a situation where there was almost no odor.

  In the time chart of FIG. 4A, in the first to third embodiments, the dimethyl sulfoxide concentration of the wastewater introduced into the first denitrification tank is about 900 ppm, and the nitrogen concentration of the wastewater introduced into the second denitrification tank is The residence time of each tank in the case of about 3000 ppm is shown. In the time chart of FIG. 4B, in the first to third embodiments, the dimethyl sulfoxide concentration of the wastewater introduced into the first denitrification tank is about 1800 ppm, and the nitrogen concentration of the wastewater introduced into the second denitrification tank is The residence time of each tank in the case of about 6000 ppm is shown.

It is a figure which shows typically exhaust gas waste water treatment system as 1st Embodiment of the exhaust gas processing apparatus of this invention and its modification. It is a figure which shows typically exhaust gas wastewater treatment system as 2nd Embodiment of this invention, and its modification. It is a figure which shows typically exhaust gas wastewater treatment system as 3rd Embodiment of this invention, and its modification. It is a time chart which shows the residence time of each tank in the said 1st-3rd embodiment in case a dimethylsulfoxide density | concentration is about 900 ppm and a nitrogen concentration is about 3000 ppm. It is a time chart which shows the residence time of each tank in the said 1st-3rd embodiment in case a dimethylsulfoxide density | concentration is about 1800 ppm and a nitrogen concentration is about 6000 ppm.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1N 1st denitrification tank 2 Stirrer 3 Air lift 4A, 4B Separation wall 5A-5D Aeration pipe 6, 6N 1st nitrification tank 7A, 7B Submerged film 8A, 8B Submerged film pump 9A, 9B Gravity piping 10 Exhaust Fan 11 Scrubber 12A-1 to 12A-3, 47, 48, 12B Deodorized sludge outbound piping 13 Deodorized sludge return piping 14 Odor gas 15 Process gas 16 Blower 17, 17N Second denitrification tank 18 Stirrer 19 Air lift 20, 20N Second nitrification tank 21 Pipe for introducing malodorous sludge 22 Sludge pump 23, 23N Semi-anaerobic part 24, 24N Aerobic part 25, 25N Semi-anaerobic part 26, 26N Aerobic part 27 Filling with vinylidene chloride
28 Wastewater treatment device that generates malodor 29 Wastewater treatment device that treats malodor 30 Contact oxidation tank 31 Oyster shell
32 Precipitation tank 33 Lake 34 Sludge pump 35 Upper piping nozzle 36 Middle piping nozzle 37 Activated carbon water tank 38 Stirrer 39 Activated carbon water 40 Circulating pump 41 Micro-nano bubble generator 42 Valve 43 Air suction pipe 44 Micro-nano bubble generating tank

Claims (17)

  An exhaust gas treatment method characterized by treating malodorous gas with a plurality of types of sludge. An exhaust gas treatment section into which malodorous gas is introduced;
An exhaust gas treatment apparatus comprising: a sludge introduction part for introducing a plurality of types of sludge into the exhaust gas treatment part. The exhaust gas treatment apparatus according to claim 2,
The sludge includes at least two types of microbial sludge. The exhaust gas treatment apparatus according to claim 2,
A first wastewater treatment device having a contact oxidation tank filled with oyster shells and a subsequent precipitation tank of the contact oxidation tank;
A first sludge introduction section for introducing the first sludge from the settling tank of the first waste water treatment apparatus into the exhaust gas treatment section;
A second wastewater treatment device having a microorganism treatment tank containing a submerged membrane;
An exhaust gas treatment apparatus comprising: a second sludge introduction unit that introduces second sludge from the microorganism treatment tank of the second waste water treatment device into the exhaust gas treatment unit. The exhaust gas treatment apparatus according to claim 4,
The exhaust gas treatment part
An exhaust gas treatment apparatus, wherein the malodorous gas is treated with the first sludge, and the treated malodorous gas is further treated with the second sludge. The exhaust gas treatment method according to claim 1,
The malodorous gas is
An exhaust gas treatment method characterized by being a malodorous gas containing sulfur generated when denitrification treatment of wastewater containing aminoethanol and dimethyl sulfoxide. The exhaust gas treatment apparatus according to claim 2,
The malodorous gas is
An exhaust gas treatment apparatus characterized by being a malodorous gas containing sulfur generated from a wastewater treatment apparatus having a nitrification tank in which a waste water containing aminoethanol and dimethyl sulfoxide is introduced and a denitrification tank and a submerged membrane are installed . The exhaust gas treatment apparatus according to claim 2,
An exhaust gas treatment apparatus, wherein at least one of the plurality of types of sludge contains activated carbon. The exhaust gas treatment apparatus according to claim 2,
An exhaust gas treatment apparatus, wherein at least one of the plurality of types of sludge contains mineral. The exhaust gas treatment apparatus according to claim 4,
The second waste water treatment device is a waste water treatment device for treating nitrogen waste water,
The exhaust gas treatment apparatus, wherein the microorganism treatment tank including the submerged membrane is a nitrification tank. The exhaust gas treatment apparatus according to claim 7 or 10,
The nitrification tank is
An exhaust gas treatment apparatus having a lower semi-anaerobic part and an upper aerobic part. The exhaust gas treatment method according to claim 1,
The exhaust gas treatment method, wherein the malodorous gas is a gas containing a volatile organic compound. The exhaust gas treatment apparatus according to claim 2,
The malodorous gas is a gas containing a volatile organic compound. The exhaust gas treatment method according to claim 1,
The exhaust gas treatment method, wherein the sludge is sludge containing micro / nano bubbles. The exhaust gas treatment apparatus according to claim 2,
The exhaust gas treatment apparatus, wherein the sludge is sludge containing micro / nano bubbles. The exhaust gas treatment method according to claim 12,
The volatile organic compound contained in the malodorous gas contains at least one of isopropyl alcohol, acetone, and butyl acetate. The exhaust gas treatment apparatus according to claim 13,
The volatile organic compound contained in the malodorous gas contains at least one of isopropyl alcohol, acetone, and butyl acetate.

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