JP3413856B2 - Method and apparatus for simultaneous treatment of digestive gas and odorous gas - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to sewage, night soil, industrial wastewater,
The present invention relates to a method and an apparatus for simultaneously processing digestive gas and odorous gas for removing hydrogen sulfide from the digestive gas generated by anaerobic microbial digestion of organic substances such as sludge and dust and deodorizing odorous gas.

[0002]

BACKGROUND ART Anaerobic microbial digestion (hereinafter sometimes referred to as anaerobic digestion) and a method for treating organic substances such as wastewater such as sewage, night soil, industrial wastewater, or solid waste such as sludge and garbage, and Aerobic microbial oxidation (hereinafter sometimes referred to as aerobic oxidation) is performed. Among them, anaerobic digestion is a narrow sense of anaerobic digestion method that introduces the whole solid matter of organic substances into the digestion facility and anaerobically digests it with a long residence time, and removes solids from organic waste. However, high-load anaerobic treatment methods such as UASB method (upflow sludge blanket method), fluidized bed method, fixed bed method, etc. in which a solution containing soluble organic matter is brought into contact with sludge under high load and treated for a short residence time. And are common.

In these anaerobic digestions, digestive gas (biogas) is generated by methane fermentation. In addition to methane, the digestive gas contains gases such as 20 to 40% by volume of carbon dioxide and 0.05 to 2% by volume of hydrogen sulfide. Such digestive gas is usually used effectively as fuel for boilers or incinerators for the purpose of recovering energy, but from the viewpoint of preventing corrosion of incinerators and preventing air pollution, before use for combustion. Hydrogen sulfide is removed (desulfurization). The concentration of hydrogen sulfide in digestive gas varies depending on the concentration of sulfate ion in wastewater or waste that undergoes methane fermentation treatment.

On the other hand, anaerobic digestion is carried out in an anaerobic atmosphere without supplying air, so that odor is generated from the entire facility. The main components of the odor are an organic acid odor generated in the acid generation phase and a hydrogen sulfide odor generated in the methanation phase, and if this leaks to the outside, it causes odor pollution. Therefore, the treatment tank is covered with a cover and sucked to prevent the odorous gas from leaking to the outside.
Deodorized by chemical cleaning and activated carbon treatment.

As a conventional method for desulfurizing digestive gas, Japanese Patent Publication No. Sho 62-38015 discloses that the digestive gas produced is activated in aerobic treatment in order to remove hydrogen sulfide contained in the digestive gas generated in the methane production phase. A method of contacting with sludge is disclosed. This method is a method in which hydrogen sulfide is absorbed by activated sludge to grow hydrogen sulfide-utilizing bacteria in the activated sludge and desulfurize. However,
With such a method, the odorous gas cannot be deodorized, and if the digestive gas and the odorous gas are treated at the same time, the methane gas concentration in the digestive gas will decrease, and the utility value will decrease.

As a method of deodorizing odorous gas, there is a method of introducing odorous gas into an aerobic treatment device installed separately from anaerobic digestion or as a post-treatment for anaerobic digestion and bringing the odorous gas into contact with activated sludge to deodorize. is there. However, if there is an aerobic treatment device near the anaerobic treatment device, it can be deodorized simply by introducing odorous gas into the aerobic treatment device and blowing it in, but as in the case of discharging anaerobic treated water to sewage, If there is no aerobic treatment equipment nearby, a separate odor gas treatment facility is required. However, installing an activated sludge treatment device for odor treatment as an aerobic treatment device is
It is uneconomical because it requires a sludge return pump.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems by desulfurizing a digested gas at a low cost efficiently without lowering the content of methane gas, and at a high desulfurization rate. An object of the present invention is to propose a method and apparatus for simultaneously treating digestive gas and odorous gas, which can deodorize odorous gas and do not generate new waste liquid with desulfurization and deodorization.

[0008]

The present invention is the following method and apparatus for simultaneously treating digestive gas and odorous gas. (1) Anaerobic microbial digestion of organic substances is performed in an anaerobic digestion facility to obtain 1/1000 of digestive juice in the anaerobic digestion facility.
0 to 1/10 is introduced into the aerobic oxidizer for aerobic oxidation.
In the method, the digestive gas generated by digestion of anaerobic microorganisms is brought into contact with a cleaning liquid composed of a mixed liquid or a treatment liquid in the aerobic oxidizer maintained at pH 7 to 9 to obtain the digestive gas. The absorption step of absorbing the hydrogen sulfide in the cleaning solution and the absorption solution obtained in the absorption step are preferable.
From the mixed gas of odorous components and air derived from the anaerobic digestion of the organic substance, the oxidation process of oxidizing aerobic microorganisms in the aerobic oxidation device to oxidize the absorbed hydrogen sulfide.
And a step of performing deodorization and aerobic microbial oxidation by introducing the odorous gas described above into the oxidation step. (2) Methane that anaerobic digestion facility consists of UASB reactor
Of the digestive gas and odorous gas according to (1) above, which has a production tank
Simultaneous processing method. (3) Digests anaerobic microorganisms from organic substances to generate digestive gas
Of the anaerobic digestion facility to produce and the digestive juices of the anaerobic digestion facility
Introduction of 1/10000 to 1/10, oxidation of aerobic microorganisms
Decomposing aerobic oxidation apparatus organics were, the anaerobic vanishing
Digestion gas generated in the gasification facility was maintained at pH 7-9
It consists of a mixed solution or a processing solution in the aerobic oxidizer.
Contact the cleaning solution to remove hydrogen sulfide in the digestion gas.
Absorption device for absorbing cleaning liquid, and the anaerobic digestion facility
Digestion gas supply path for supplying digestion gas from the above to the absorption device
A mixed solution from the aerobic oxidizer to the absorber or
Is used in the anaerobic digestion facility as well as the feed line for supplying the treatment liquid.
The odorous gas consisting of a mixed gas of live odorous components and air
The odorous gas supply path for supplying to the aerobic oxidizer and the intake
Return of absorbing liquid from the collecting device to the aerobic oxidation device
Of digestive gas and odorous gas characterized by having a liquid passage
Simultaneous processing equipment. (4) Anaerobic digestion facility methane consisting of UASB reactor
Of the digestive gas and odorous gas according to the above (3), which has a production tank
Simultaneous processing equipment.

In the present invention, anaerobic digestion is an operation of decomposing organic substances by utilizing the action of anaerobic microorganisms by keeping an organic substance which is an object to be treated in an anaerobic state,
Anaerobic digestion in the narrow sense of inputting and digesting the whole organic substance, and high load anaerobic treatment such as UASB method of removing solid matter and anaerobic treatment of only soluble organic matter, fluidized bed method, fixed bed method, etc. In addition to the above, other processes include anaerobic digestion and other processes in which organic substances are simply deposited in a facility and digested. These anaerobic digestions can be processed by any anaerobic digester such as a packed bed type, a fluidized bed type, and a sludge blanket type.

The digestive gas to be desulfurized in the present invention is, for example, sewage, night soil, wastewater such as industrial wastewater and sludge,
It is a digestion gas generated by methane fermentation in a methane production tank when anaerobicly digesting organic substances such as solid waste such as garbage. Such digestive gas usually contains gases such as carbon dioxide and hydrogen sulfide in addition to methane gas. The above-mentioned digestive gas is generally generated by anaerobic digestion in an anaerobic digester, but it may also be generated by anaerobic digestion in an anaerobic digester other than the anaerobic digester such as a garbage landfill.

The odorous gas to be deodorized in the present invention is an odorous gas derived from an anaerobic digestion facility with anaerobic digestion. Such odorous gas can be obtained by covering these facilities with a cover and sucking them with a blower in order to remove the odors generated from the storage tank for treated substances, acid generation tank, methane generation tank, treated water tank, sludge storage tank, etc. It is a mixed gas of odorous components and air. The odorous components include hydrogen sulfide, methyl mercaptan, organic acids and their esters as main components.

[0012]

The processing method of the present invention will be described below together with the operation of the processing apparatus of the present invention. First, in the treatment apparatus of the present invention, an anaerobic digestion facility performs anaerobic digestion of organic substances to decompose organic substances. Then, the digestive gas generated by digestion is supplied from the digestive gas supply path to the absorber for desulfurization, and the odorous gas is supplied to the aerobic oxidizer for deodorization and aerobic oxidation.

In the absorption step in the absorption device, the digestive gas is brought into contact with the cleaning liquid to absorb hydrogen sulfide in the digestive gas into the cleaning liquid. As a cleaning solution , maintain a pH of 7-9
Mixture or processing liquid is used in aerobic oxidation apparatus. Organic substances of performing aerobic oxidation, digestive fluids (treatment liquid) of anaerobic digestion Ru der.

In this case, the digestive liquid of the anaerobic digestion facility is introduced into the aerobic oxidation device to perform aerobic oxidation, and the mixed solution or treatment liquid is sent to the absorption device as a cleaning liquid, and then from the anaerobic digestion facility. Ru is contacted with the biogas supplied. In the system for particular discharge the <br/> anaerobic digestion solution as it sewers, etc., in order to perform the desulfurization of the present invention, you aerobic oxidizing part of the anaerobic digestion solution. In this case, the amount of anaerobic digestion solution to perform aerobic oxidation is rather good to the extent required for the oxidation process of desulfurization, digestion
It is 1/10000 to 1/10 of the liquid .

The aerobic oxidation in the aerobic oxidizer is a treatment for keeping the digestive juice of the anaerobic digestion facility, which is the object to be treated, in an aerobic state and oxidatively decomposing the organic matter by utilizing the action of aerobic microorganisms. The treatment can be carried out by any treatment method using an aerobic oxidizer such as an activated sludge method, a spray filter method, an immersion type fixed bed method, a fluidized bed method and a rotating disk method. In the present invention, the odorous gas is supplied to the aerobic oxidizer and brought into contact with the aerobic microorganisms and the organic matter to oxidize and deodorize the odorous component, and the aerobic oxidation of the organic matter by the action of oxygen in the odorous gas. To do. Here, air may be supplied together with the odorous gas.

The mixed liquid in the aerobic oxidation used as the cleaning liquid is a mixed liquid in which the liquid to be treated during the aerobic oxidation is mixed with sludge containing aerobic microorganisms (activated sludge). Is a treatment liquid obtained by separating sludge after aerobic oxidation.

As the cleaning liquid, the use of a mixed liquid has a higher hydrogen sulfide absorption efficiency and a higher desulfurization rate. It is speculated that this is due to adsorption by sludge or ingestion by aerobic microorganisms, but it is not clear. If the absorption device having the highest gas-liquid contact efficiency is used, the absorption efficiency of the treatment liquid will be high and the desulfurization rate will be high.

As the absorption device used in the absorption step, any device can be used as long as it efficiently makes the digestion gas and the cleaning liquid come into gas-liquid contact, and any type such as an aeration tank, a packed tower, a spray tower, a scrubber, etc. can be used. is there. The conditions for passing digestion gas through the absorber are usually space velocity (SV) of 5 to 50 h.
r ⁻¹ , preferably 10 to 20 hr ⁻¹ , and the washing liquid passing conditions are usually such that the residence time (HRT) is 2 to 60 minutes, preferably 5 to 20 minutes.

By making gas-liquid contact in the absorption device, hydrogen sulfide in the digestion gas is absorbed by the cleaning liquid to obtain an absorption liquid. At this time, carbon dioxide and other impurities in the digestion gas are also absorbed by the cleaning liquid, and a processing gas having a high methane concentration is obtained. When the mixed solution is used as a cleaning solution, when hydrogen sulfide is absorbed by the mixed solution, it is considered that adsorption by sludge or ingestion by microorganisms occurs. Absorption efficiency of the hydrogen sulphide as the pH of the cleaning solution is high rather high, in the present invention pH7
Keep ~ 9 .

Since the organic matter is decomposed by the aeration of the odorous gas and the carbon dioxide is stripped in the mixed solution or treatment solution of the aerobic oxidizer, both the alkalinity and the pH are higher than those of the anaerobic digestion solution. The pH is usually 7-9. Therefore, the mixed solution or the treatment solution can be used as it is as a cleaning solution without adjusting the pH, but when the pH is low, an alkali is added to adjust the pH to the above .

The absorption liquid which has absorbed hydrogen sulfide in the absorption step is returned to the aerobic oxidation device in the oxidation step to undergo aerobic oxidation, and hydrogen sulfide is oxidized by the action of aerobic microorganisms. At this time, other impurities absorbed in the absorption step are also treated. For example, carbon dioxide is stripped and organic matter is decomposed.

Aerobic microorganisms in the aerobic oxidizer are:
Bacteria that aerobically decompose odorous components and organic matter are the main constituents, but since sludge contains sulfur-oxidizing bacteria such as Thiobacillus, Thiotrix and Begiatoa, it is sulphated by its oxidizing action. Hydrogen is made harmless by being oxidized to sulfate ions or elemental sulfur.

Oxidation of hydrogen sulfide produces sulfate ions, which lowers the pH of the mixed solution or treatment solution. Usually, without adjusting the pH, it is possible to send the mixed solution or the treatment solution as it is to the absorption step to absorb hydrogen sulfide, but if the amount of hydrogen sulfide is large, the amount of sulfate ions produced is also large, so If is less than 7, keep the pH at 7-9 by adding alkali such as sodium hydroxide.
It Even in this case, the amount of alkali used is smaller than that in the chemical cleaning method.

The mixed liquid obtained by decomposing odorous components and organic substances by aerobic oxidation and oxidizing hydrogen sulfide is subjected to solid-liquid separation to remove solids, and the separated liquid is discharged as a treatment liquid. The necessary amount of separated sludge is returned to the aerobic oxidizer, and excess sludge is discharged to the outside of the system. During this time, a part of the mixed liquid or the processing liquid is sent to the absorption device as a cleaning liquid. As a result, the digestive gas and the odorous gas are processed at the same time.

[0025]

EXAMPLES The present invention will be described below with reference to examples. Figure 1
Is a system diagram showing a simultaneous digestion gas and odorous gas treatment apparatus according to the embodiment, and FIG. 2 is a configuration diagram of the absorption apparatus and aerobic oxidation apparatus. In the figure, reference numeral 1 denotes an anaerobic digester, which comprises an object storage tank 2, an acid production tank 3, a methane production tank 4 and a treatment liquid tank 5. 6 is an aerobic oxidizer, and 7 is an absorber.

The anaerobic digestion apparatus 1 is connected with a material introduction passage 8 and a treatment liquid passage 9. The object storage tank 2, the acid production tank 3, the methane production tank 4, and the treatment liquid tank 5 each are a closed tank, and are connected to the series by flow paths 11, 12, and 13. The object storage tank 2, the acid production tank 3, and the processing liquid tank 5 are covered with a cover and communicate with the odorous gas supply passage 14.
It is connected to the aerobic oxidizer 6 via a blower 15.
The methane production tank 4 employs any anaerobic treatment method such as UASB, fluidized bed, fixed bed, and anaerobic contact method, and the digestion gas supply passage 16 connects the lower portion of the absorber 7 via the blower 17 from the top thereof. ing.

The aerobic oxidizer 6 comprises an aerobic oxidizer 6a and a solid-liquid separator 6b. An anaerobic digestive liquid transfer passage 18 and a return liquid passage 19 are connected to the upper part of the aerobic oxidation part 6a, and an air diffuser 6c is provided to the lower part thereof, and the odorous gas supply passage 14 is connected to this. From the solid-liquid separation section 6b, the liquid feed passage 20 communicates with the absorption device 7 via the pump 21, and the treatment liquid discharge passage 22 communicates with the treatment liquid passage 9.

The absorption device 7 stores the cleaning liquid 23 therein. The digestion gas supply passage 16 and the liquid feed passage 20 are connected to the lower portion of the absorber 7, and the gas discharge passage 24 and the return liquid passage 19 are connected to the upper portion.

The processing method by the above processing apparatus is as follows. First, the treated substance storage tank 2 of the anaerobic digester 1 is introduced from the treated substance introducing passage 8 and the treated substance made of an organic substance such as sewage, human waste, drainage, etc. When transferred to the acid production tank 3 and kept anaerobic, an organic acid is produced by organic acid fermentation. When the organic acid fermentation liquid is introduced into the methane production tank 4 from the flow path 12 and anaerobically treated, methane fermentation is performed by the action of anaerobic microorganisms, and methane is produced. The digestion gas generated by this anaerobic digestion is supplied from the digestion gas supply passage 16 to the absorber 7 by the blower 17. The anaerobic digestive liquid is taken out from the flow path 13 to the treatment liquid tank 5, and then part of it is transferred to the aerobic oxidation device 6 from the anaerobic digestive liquid transfer path 18. Then, the object storage tank 2, the acid production tank 3, the processing liquid tank 5
The odorous gas generated in 1 is collected in the odorous gas supply passage 14 and supplied to the diffuser pipe 6c of the aerobic oxidizer 6 by the blower 15.

In the aerobic oxidizer 6, the liquid to be treated flowing in from the anaerobic digestion liquid transfer passage 18 is mixed with activated sludge in the aerobic oxidizer 6a, and the odorous gas supplied from the odorous gas supply passage 14 is diffused into the aeration pipe. Aerate from 6c and perform aerobic oxidation. In this aerobic oxidation, by the action of aerobic microorganisms contained in activated sludge, along with the organic matter in the liquid to be treated,
The odorous components in the odorous gas are decomposed and deodorized. A part of the mixed liquid in the aerobic oxidation section 6a is part of the solid-liquid separation section 6b.
The liquid enters and is subjected to solid-liquid separation, a part of the separated liquid is sent from the liquid sending passage 20 to the absorbing device 7 by the pump 21, and the rest is discharged as a processing liquid from the processing liquid discharge passage 22. Part of the separated activated sludge is returned to the aerobic oxidation section 6a, and the excess sludge is discharged to the outside of the system.

In the desulfurization of digestive gas, first, in the absorption step, a part of the treatment liquid is sent from the solid-liquid separation section 6b of the aerobic oxidation device 6 to the lower part of the absorption device 7 through the liquid supply passage 20 by the pump 21. To do. Then, the digestion gas supplied from the digestion gas supply passage 16 is passed through the cleaning liquid 23 in an upward flow to make gas-liquid contact with the cleaning liquid 23 to absorb hydrogen sulfide, carbon dioxide, and other water-soluble components in the digestion gas. . The condition for supplying digestion gas to the absorber 7 is 5 to 50 hours as SV.
r ^-1 , preferably 10 to 20 hr ^{-1, and the} washing liquid 23 is passed under conditions of HRT of 2 to 60 minutes, preferably 5 to 20 minutes.

Carbon dioxide is removed from the cleaning liquid 23, and p
Since H is 7 to 9, the absorption efficiency of hydrogen sulfide, carbon dioxide, etc. is good. The digested gas from which hydrogen sulfide, carbon dioxide, etc. have been removed by gas-liquid contact is discharged from the gas discharge passage 24 as a process gas having a high methane concentration. Further, the cleaning liquid 23 that has absorbed hydrogen sulfide, carbon dioxide, etc. is returned to the aerobic oxidation device 6 from the returning liquid passage 19 as an absorbing liquid.

As the cleaning liquid to be sent from the aerobic oxidation device 6 to the absorption device 7, the mixed solution of sludge is more efficient than the processed solution after separating the sludge, but the bacterial cells are When exposed to toxic hydrogen sulfide, the bacterial activity in the aerobic oxidizer 6 may be reduced, and overload may result in significant foaming. Therefore, sludge was separated for stable operation. It is better to circulate the treatment liquid with the absorption device 7.

The absorption liquid returned to the aerobic oxidation device 6 is
As an oxidation step, the aerobic oxidation section 6a mixes with activated sludge and undergoes aerobic oxidation. Then, due to the action of aerobic microorganisms, hydrogen sulfide and other oxidizable substances in the absorbing solution are microbially oxidized and rendered harmless. Carbon dioxide is stripped and removed by aeration. When sulfate ions are generated by the oxidation of hydrogen sulfide and the pH drops too much,
An alkali is injected into the aerobic oxidation section 6a to adjust the pH.

The above-mentioned oxidation step for desulfurization is carried out at the same time as the aerobic oxidation for removing organic matters in the liquid to be treated and deodorizing the odorous gas, and the treated liquid which has been rendered harmless is treated liquid discharge path 2
From 2, it can be discharged into sewage together with other anaerobic treatment liquids. The amount of the processing liquid supplied to the aerobic oxidation apparatus 6 to a condition which can grow heterotrophic bacteria organic matter and anaerobic bacteria remaining in the liquid to be treated as a substrate, the disgusting <br/> temper treatment liquid and 1 / 10,000 to 1/10.

In the above embodiment, the anaerobic digester 1
Some of the anaerobic digestion solution, and aerobic oxidation in an aerobic oxidation apparatus 6, that shows the case where discharge most of the anaerobic digestion solution as sewage or the like. Further , the acid fermentation tank 3 can be omitted and the acid fermentation can be carried out in the object storage tank 2 or the methane production tank 4. The treatment liquid tank 5 can also be omitted.

Further it is also possible to desulfurize the digestion gas generated waste disposal site, a composting facilities, these cases, the mixture or the processing liquid aerobic oxidation of leachate can be used as the washing liquid 23 .

Test examples will be described below. Test Example 1 In the treatment apparatus of FIG. 1 and FIG. 2, 1.4 m ³ was used as the methane production tank 4 by using the waste water of the beer factory as the material to be treated.
Anaerobic treatment was carried out by adopting the UASB reactor of. As the aerobic oxidizer 6, an aeration tank with a capacity of 212 liters and a tank with a sludge precipitation separation mechanism is used, and the odor sucked from the space of the object storage tank 2, the acid generation tank 3, and the processing liquid tank 5 is used. Gas was bubbled at 0.06 Nm ³ / min. Further, the anaerobic treatment liquid was supplied to the aerobic oxidation device 6 under the conditions of HRT for 4 to 5 days. On the other hand, the effluent after sludge separation of the aerobic oxidizer 6 was supplied to the absorber 7 at 2 liter / min, and the absorbed liquid was circulated to the aerobic oxidizer 6 again. The absorption device 7 is a column with a capacity of 22 liters and a height of 2.8 m. The digestion gas is supplied from the bottom up to the 21st day at a gas supply rate of 2.5 liter / min.
(SV = 6.8 hr ⁻¹ ) and after that 4.5 lit
er / min (SV = 12.2 hr ⁻¹ ) and continuously operated for a total of about 2 months. The treatment results are shown in Table 1 as an average value.

[0039]

[Table 1] As shown in Table 1, the hydrogen sulfide removal rate was 90% or more, the odor concentration removal rate between the inlet and outlet of the aerobic oxidizer was 95% or more, and this treatment function continued for about 2 months.

[0040]

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to remove odor in an anaerobic digestion facility
Anaerobic microbial digestion of organic substances by anaerobic digestion
Aerobically oxidize 1/1000 to 1/10 of digestive juice
Anaerobic microbes in a method of introducing aerobic oxidation into a cell.
The digestive gas of biological digestion is brought into contact with a cleaning liquid consisting of an aerobic oxidation mixture or treatment liquid maintained at pH 7 to 9 to absorb hydrogen sulfide, which is oxidized by an aerobic oxidation device and odorous gas is emitted. Since it is supplied to the aerobic oxidizer for deodorization, it is possible to desulfurize digestion gas at a low cost and with a high desulfurization rate, thereby obtaining a process gas with a high methane content rate and simultaneously deodorizing odorous gas, Hydrogen sulfide can be rendered harmless and discharged together with the treatment liquid.

[Brief description of drawings]

FIG. 1 is a system diagram showing a simultaneous digestion gas and odorous gas processing apparatus of an embodiment.

FIG. 2 is a configuration diagram showing an absorber and an aerobic oxidizer of an embodiment.

[Explanation of symbols] 1 Anaerobic digester 2 Processing object storage tank 3 Acid production tank 4 Methane production tank 5 processing liquid tank 6 Aerobic oxidizer 6a Aerobic oxidation part 6b Solid-liquid separation section 6c Air diffuser 7 Absorber 8 Processing object introduction path 9 Processing liquid flow path 14 Odor gas supply path 15,17 Blower 16 Digestion gas supply channel 18 Anaerobic digestive fluid transfer path 19 Return liquid path 20 Liquid transfer path 21 pumps 22 Processing liquid discharge path 23 Cleaning solution 24 gas discharge channel

Claims (4)

(57) [Claims] 1. An anaerobic digestion facility performs anaerobic microbial digestion of organic substances to obtain 1 / l of the digestive juice of the anaerobic digestion facility.
Aerobic by introducing 10,000 to 1/10 to aerobic oxidizer
A method of performing oxidative oxidation, in which the digestion gas generated by digestion of anaerobic microorganisms is adjusted to pH 7-
An absorption step of causing the cleaning solution to absorb hydrogen sulfide in the digestive gas by bringing it into contact with a cleaning solution composed of a mixed solution or a treatment solution in the aerobic oxidation device maintained at 9; To the aerobic oxidizer
And Oite aerobic microbial oxidation, an oxidation step of oxidizing the absorbed hydrogen sulfide, and odor components derived by anaerobic digestion of the organic material
A method for simultaneous treatment of digestive gas and odorous gas, comprising the step of introducing an odorous gas composed of a mixed gas of air into the oxidation step to perform deodorization and aerobic microbial oxidation. 2. The anaerobic digestion facility comprises a UASB reactor.
Digestion gas and odor according to claim 1 having a methane production tank
Simultaneous gas treatment method. 3. An organic substance is digested by anaerobic microorganisms and digested.
An anaerobic digestion facility that produces gas, 1/10000 ~ 1/10 of the digestive juice of anaerobic digestion facility
Introduce aerobic microorganisms to oxidize and decompose organic matter
An oxidizer, The digestive gas generated in the anaerobic digestion facility is adjusted to pH 7-9.
Mixed solution in the aerobic oxidizer maintained at
By contacting it with a cleaning liquid consisting of the treatment liquid,
An absorption device for absorbing hydrogen sulfide into the cleaning liquid, Supply digestion gas from the anaerobic digestion facility to the absorber
Digestive gas supply channel Mixture or treatment from the aerobic oxidizer to the absorber.
A liquid supply path for supplying a physical fluid, Gas mixture of odorous components and air derived from the anaerobic digestion facility
Odor that supplies odorous gas consisting of oxygen to the aerobic oxidizer
An air-gas supply path, Return absorption liquid from the absorber to the aerobic oxidizer
And the return liquid path Digestive gas and odor characterized by having
Simultaneous gas processing equipment. 4. The anaerobic digestion facility comprises a UASB reactor.
Digestion gas and odor according to claim 3, which has a methane production tank.
Simultaneous gas processing equipment.