JPH10128042A - Biological treatment of malodorous gas - Google Patents
Biological treatment of malodorous gasInfo
- Publication number
- JPH10128042A JPH10128042A JP8283863A JP28386396A JPH10128042A JP H10128042 A JPH10128042 A JP H10128042A JP 8283863 A JP8283863 A JP 8283863A JP 28386396 A JP28386396 A JP 28386396A JP H10128042 A JPH10128042 A JP H10128042A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- packed bed
- malodorous
- malodorous gas
- packed layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、含硫黄化合物を中
心とする悪臭を脱臭するための悪臭ガスの生物的処理方
法に関する。さらに詳しくは、下水・しにょう・その他
の廃水処理設備、畜産工場、食品工場などから発生する
硫黄系悪臭ガスを、微生物の働きを用いて脱臭するため
の悪臭ガスの生物的処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for biologically treating malodorous gas for deodorizing malodors, mainly sulfur-containing compounds. More particularly, the present invention relates to a biological treatment method of malodorous gas for deodorizing sulfur-based malodorous gas generated from sewage, shrine and other wastewater treatment facilities, livestock factories, food factories, etc. by using the action of microorganisms.
【０００２】[0002]
【従来の技術】従来、下水などの廃水処理設備や産業廃
水などから発生する硫黄系悪臭ガスの脱臭方法として
は、水洗法、薬液洗浄法、吸着法などが一般的である
が、薬品や活性炭などの消耗性の資材を用いるため、ラ
ンニングコストが割高であった。これに対して、微生物
の働きにより悪臭を除去する生物脱臭法は、ランニング
コストが低く、しかも優れた脱臭性能を有し、経済的な
方法といえる。しかし生物脱臭法は、硫黄系悪臭物質の
中でも分解しやすい硫化水素に対する除去率は比較的高
いが、メチルメルカプタン、硫化メチル、二硫化メチル
に対する分解能が不十分であるという問題を有してい
た。2. Description of the Related Art Conventionally, as a method for deodorizing sulfur-based malodorous gas generated from wastewater treatment equipment such as sewage or industrial wastewater, a water washing method, a chemical solution washing method, an adsorption method and the like are generally used. Running costs were relatively high because of the use of consumable materials such as On the other hand, the biological deodorization method of removing bad smell by the action of microorganisms can be said to be an economical method with low running cost and excellent deodorization performance. However, the biological deodorization method has a problem that the removal rate of hydrogen sulfide, which is easily decomposed among sulfur-based malodorous substances, is relatively high, but the resolution of methyl mercaptan, methyl sulfide, and methyl disulfide is insufficient.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、前記の問題
を解決し、メチルメルカプタン、硫化メチルおよび二硫
化メチルを十分に分解し、かつ、硫化水素の除去率をさ
らに高め、効率的な脱臭処理を行う悪臭ガスの生物的処
理方法を提供することを目的とする。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, sufficiently decomposes methyl mercaptan, methyl sulfide and methyl disulfide, further increases the removal rate of hydrogen sulfide, and achieves efficient deodorization. It is an object of the present invention to provide a method for biological treatment of a malodorous gas to be treated.
【０００４】[0004]
【課題を解決するための手段】本発明者は、前記の課題
を解決するために、微生物を担持した充填層に含硫黄化
合物を含む悪臭ガスを通過させ、悪臭物質を生物的に分
解して処理し、処理されたガスの一部を排出するととも
に一部を前記充填層に還流し、前記の悪臭ガスと併せて
再度処理することを特徴とする、悪臭ガスの生物的処理
方法を提供する。Means for Solving the Problems In order to solve the above-mentioned problems, the present inventor has made it possible to pass a malodorous gas containing a sulfur-containing compound through a packed bed carrying microorganisms to decompose the malodorous substance biologically. A method for biologically treating malodorous gas, comprising treating and discharging a part of the treated gas, recirculating a part of the gas to the packed bed, and re-treating the gas together with the malodorous gas. .
【０００５】また、本発明は、微生物を担持した充填層
を少くとも二段設けて含硫黄化合物を含む悪臭ガスを通
過させ、前段の充填層において主に硫化水素を分解し、
後段の充填層において残余の比較的難分解性含硫黄化合
物を硫化水素とその残基とに生物的に分解して処理し、
処理されたガスの一部を排出するとともに一部を前段の
充填層に還流し、前記の悪臭ガスと併せて再度処理する
ことを特徴とする、悪臭ガスの生物的処理方法を提供す
る。前記の悪臭ガスの生物的処理方法において、前段の
充填層のｐＨを２〜３に、後段の充填層のｐＨを６．５
〜７．５に調整すると、効率のよい処理を期待できる。[0005] The present invention also provides at least two stages of a packed bed carrying microorganisms, allowing malodorous gas containing a sulfur-containing compound to pass therethrough, and mainly decomposing hydrogen sulfide in the preceding packed bed.
In the subsequent packed bed, the remaining relatively hardly decomposable sulfur-containing compounds are biologically decomposed into hydrogen sulfide and its residues and treated,
Disclosed is a method for biologically treating malodorous gas, which comprises discharging a part of the treated gas, refluxing a part of the gas to a preceding packed bed, and retreating the gas together with the malodorous gas. In the above-mentioned biological treatment method for malodorous gas, the pH of the former packed bed is adjusted to 2-3 and the pH of the latter packed bed is set to 6.5.
By adjusting the value to 7.5, efficient processing can be expected.
【０００６】[0006]
【発明の実施の形態】以下、本発明を図面を参照しつつ
詳細に説明する。図１は本発明の悪臭ガスの生物的処理
方法を実現する一実施形態例の概略フローシートであ
る。二段に設けられた脱臭塔１および３は、それぞれ微
生物を担持する充填層２および４を有している。充填層
は、通常、多孔質セラミック、合成樹脂、天然材料、カ
ーボンなどを用いて構成する。充填層中に蓄積する老廃
物は散水管９により充填層２および４に散水して洗浄
し、配水管１０から排水する。散水管９を用いれば、各
充填層のｐＨを微生物に適した範囲に調節することもで
きる。悪臭ガスは、悪臭ガス送入管５から前段の脱臭塔
１に流入する。悪臭ガスが充填層２を通過する過程で、
充填層２に担持された微生物の働きにより、悪臭物質の
うち硫化水素やアンモニアなどが酸化分解除去される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic flow sheet of an example of an embodiment for realizing the method for biologically treating an odorous gas of the present invention. The deodorization towers 1 and 3 provided in two stages have packed layers 2 and 4 carrying microorganisms, respectively. The filling layer is usually formed using a porous ceramic, a synthetic resin, a natural material, carbon, or the like. Waste products accumulating in the packed bed are sprinkled on the packed beds 2 and 4 by a sprinkling pipe 9 to be washed, and then drained from a water pipe 10. If the sprinkling tube 9 is used, the pH of each packed bed can be adjusted to a range suitable for microorganisms. The malodorous gas flows from the malodorous gas inlet pipe 5 into the deodorization tower 1 at the preceding stage. In the process where the odorous gas passes through the packed bed 2,
By the action of the microorganisms carried on the packed bed 2, hydrogen sulfide, ammonia and the like among the malodorous substances are oxidatively decomposed and removed.
【０００７】前段で脱臭された一次処理ガスは、移送管
６を通って後段の脱臭塔３に流入し、充填層４を通過す
る過程で、残存するメチルメルカプタン、硫化メチル、
二硫化メチルなどの含硫黄化合物が除去される。処理ガ
ス排出管７から排出された二次処理ガスの一部は、処理
ガス還流管８を通って未処理の悪臭ガスと合流し、悪臭
ガス送入管５から再度充填層２および４を通過して処理
された後、処理ガス排出管７から大気中に排出される。
この循環により、二次処理ガスに含まれている未分解悪
臭物質を分解除去することができる。還流させる二次処
理ガスの流量は、含まれる悪臭物質の濃度や性状などに
より一概には言えないが、一般的には未処理の悪臭ガス
に対し、３０〜１００ｖｏｌ％程度が適当である。ま
た、充填層の数は二段に限られず、目的とする処理レベ
ルに応じて単段としても、またより多く設けても構わな
い。[0007] The primary processing gas deodorized in the former stage flows into the latter deodorizing tower 3 through the transfer pipe 6 and passes through the packed bed 4 while remaining methyl mercaptan, methyl sulfide, and the like.
Sulfur-containing compounds such as methyl disulfide are removed. Part of the secondary processing gas discharged from the processing gas discharge pipe 7 merges with the untreated malodorous gas through the processing gas recirculation pipe 8, and passes again through the packed layers 2 and 4 from the malodorous gas inlet pipe 5. After being processed, it is discharged into the atmosphere from the processing gas discharge pipe 7.
By this circulation, undecomposed malodorous substances contained in the secondary processing gas can be decomposed and removed. The flow rate of the secondary processing gas to be refluxed cannot be unconditionally determined depending on the concentration and properties of the contained malodorous substance, but generally, about 30 to 100 vol% is suitable for the untreated malodorous gas. Further, the number of the packed layers is not limited to two, and may be provided as a single stage or more depending on the target processing level.
【０００８】本発明の悪臭ガスの生物的処理方法による
脱臭機構の原理は次のように考えられている。悪臭物質
のうち含硫黄化合物である硫化水素、メチルメルカプタ
ン、硫化メチル、二硫化メチルは、おもにＴｈｉｏｂａ
ｃｉｌｌｕｓｕ属の硫黄細菌で分解される。硫黄細菌の
最適成育ｐＨは、２〜３（酸性）と６．５〜７．５（中
性）との２種類に大別できる。硫化水素の分解菌は、酸
性および中性のいずれでも活性を有し、一方メチルメル
カプタン、硫化メチルおよび二硫化メチルの分解菌は中
性で活性を有するといわれている。硫化水素の分解経路
は下記の式（１）の通りであり、酸化されると硫酸を生
じ、菌の回りのｐＨが低下する。そのため、硫化水素を
処理する場合は酸性菌を利用するほうが有利である。 Ｈ2 Ｓ＋２Ｏ2 → Ｈ2 ＳＯ4 （１）[0008] The principle of the deodorizing mechanism by the biological treatment method of the offensive odor gas of the present invention is considered as follows. Among the stench substances, hydrogen sulfide, methyl mercaptan, methyl sulfide, and methyl disulfide, which are sulfur-containing compounds, are mainly Thioba.
Degraded by sulfur bacteria of the genus Cillus. The optimum growth pH of sulfur bacteria can be broadly classified into two types: 2-3 (acidic) and 6.5-7.5 (neutral). Hydrogen sulfide degrading bacteria are said to be active in both acidic and neutral, while methyl mercaptan, methyl sulfide and methyl disulfide degrading bacteria are said to be neutral and active. The decomposition pathway of hydrogen sulfide is as shown in the following formula (1). When oxidized, sulfuric acid is generated, and the pH around the bacterium decreases. Therefore, when treating hydrogen sulfide, it is more advantageous to use acid bacteria. H 2 S + 2O 2 → H 2 SO 4 (1)
【０００９】また、メチルメルカプタン、硫化メチルお
よび二硫化メチルの分解経路は化１に示す式（２）のよ
うに推定されている。The decomposition route of methyl mercaptan, methyl sulfide and methyl disulfide is estimated as shown in the following formula (2).
【化１】 一般的に、下水やしにょうの処理場などから発生する悪
臭ガスに含まれる硫黄系悪臭物質のうちでは、硫化水素
が大きなウエートを占めている。そのため、前段の充填
層２では分解しやすい硫化水素の除去が旺盛となってｐ
Ｈが低下し、後段の充填層４でメチルメルカプタン、硫
化メチル及び二硫化メチルの分解が起こる。この際、上
記分解経路に示されているように硫化水素が生成する。Embedded image In general, hydrogen sulfide occupies a large weight among the sulfur-based malodorous substances contained in the malodorous gas generated from sewage or sewage treatment plants. Therefore, the removal of hydrogen sulfide which is easily decomposed in the former packed bed 2 becomes vigorous, and p
H decreases, and methyl mercaptan, methyl sulfide, and methyl disulfide decompose in the subsequent packed bed 4. At this time, hydrogen sulfide is generated as shown in the decomposition route.
【００１０】本発明においては、中間で生成した硫化水
素を含む二次処理ガスを、再度硫化水素の分解が旺盛な
前段の充填層２を通過するように還流させ、硫化水素の
除去率を高めると共に、残存するメチルメルカプタン、
硫化メチルおよび二硫化メチルを後段の充填層４で再度
分解除去する。このため、本発明においては、硫化水素
の分解率およびメチルメルカプタン、硫化メチル、二硫
化メチルの分解率が向上し、生物脱臭装置全体での含硫
黄化合物の分解能力および脱臭効果を大幅に高めること
ができる。In the present invention, the secondary processing gas containing hydrogen sulfide generated in the middle is refluxed again so as to pass through the packed bed 2 at the former stage where the decomposition of hydrogen sulfide is vigorous, thereby increasing the removal rate of hydrogen sulfide. Together with the remaining methyl mercaptan,
Methyl sulfide and methyl disulfide are decomposed and removed again in the subsequent packed bed 4. For this reason, in the present invention, the decomposition rate of hydrogen sulfide and the decomposition rate of methyl mercaptan, methyl sulfide, and methyl disulfide are improved, and the decomposition ability and deodorizing effect of the sulfur-containing compound in the entire biological deodorization apparatus are significantly increased. Can be.
【００１１】[0011]
【実施例】以下実施例をあげて本発明の実施形態を具体
的に説明する。 実施例１ 図１に記載の２段脱臭装置を用い、後段の脱臭塔から排
出される二次処理ガスを前段の脱臭塔に還流し、本発明
の生物的処理方法を行った。まず、内径１５０ｍｍ、高
さ１５００ｍｍのアクリル製の脱臭塔１，３に、硫黄細
菌を中心とした微生物群の担体として多孔質セラミック
を６００ｍｍの高さに充填し、しにょう処理場の反応層
混合液を通して植菌した。その後、標準ガスを空気にて
希釈した合成悪臭ガスを悪臭ガスとして通気し、微生物
の馴養を行った。その後、運転条件を、通気量は０．１
ｍ3 ／ｍｉｎ、通気速度は原ガス基準としてＳＶ（空間
速度）２８０ １／Ｈｒ、還流ガスを含んだ見かけの通
気速度は４２０ １／Ｈｒ、還流させるガスの流量は悪
臭ガスに対し５０ｖｏｌ％（還流ガス通気量；０．０５
ｍ3 ／ｍｉｎ）として脱臭処理を行った。処理性能が安
定した運転開始３か月後に含硫黄化合物の残留濃度の測
定を行ったので、その結果を表１に示す。どの物質の残
留濃度も、比較例に対して３０〜６０％程度低くするこ
とができた。The embodiments of the present invention will be specifically described below with reference to examples. Example 1 The biological treatment method of the present invention was carried out by using the two-stage deodorizer shown in FIG. 1 and refluxing the secondary treatment gas discharged from the subsequent deodorization tower to the former deodorization tower. First, an acrylic deodorizing tower 1, 3 having an inner diameter of 150 mm and a height of 1500 mm is filled with a porous ceramic to a height of 600 mm as a carrier of a microorganism group mainly composed of sulfur bacteria, and the reaction layer of the sewage treatment plant is filled. Inoculated through the mixture. Thereafter, a synthetic odor gas obtained by diluting a standard gas with air was aerated as a odor gas to acclimate microorganisms. Thereafter, the operating conditions were changed to a ventilation rate of 0.1
m 3 / min, the aeration rate is SV / 280 / Hr based on the original gas, the apparent aeration rate including the reflux gas is 420 1 / Hr, and the flow rate of the refluxed gas is 50 vol% with respect to the malodorous gas. Reflux gas flow rate: 0.05
m 3 / min). The residual concentration of the sulfur-containing compound was measured three months after the start of operation when the treatment performance was stable. The results are shown in Table 1. The residual concentration of any substance could be reduced by about 30 to 60% compared to the comparative example.
【００１２】比較例１ 処理ガスの還流を行わなかったこと以外は実施例１と同
様にして脱臭処理を行った。運転開始３か月後に、含硫
黄化合物の残留濃度の測定を行ったので、その結果を表
１に示す。Comparative Example 1 A deodorizing treatment was performed in the same manner as in Example 1 except that the processing gas was not refluxed. Three months after the start of the operation, the residual concentration of the sulfur-containing compound was measured. The results are shown in Table 1.
【００１３】[0013]
【表１】 成 分 原ガス（入口ガス） 処理ガス（出口ガス） （ｐｐｍ） 実施例１ 比較例１ 硫化水素 １５ ０．０８ ０．１５ メチルメルカプタン ０．８ ０．０１ ０．０２ 硫化メチル ０．２ ０．０５ ０．０８ 二硫化メチル ０．１ ０．０３ ０．０５Table 1 Component Raw gas (inlet gas) Processing gas (outlet gas) (ppm) Example 1 Comparative Example 1 Hydrogen sulfide 15 0.08 0.15 Methyl mercaptan 0.8 0.01 0.02 Methyl sulfide 0 0.2 0.05 0.08 Methyl disulfide 0.1 0.03 0.05
【００１４】[0014]
【発明の効果】本発明を利用すれば、硫化水素、メチル
メルカプタン、硫化メチルおよび二硫化メチルの含硫黄
化合物を高濃度に含有する悪臭ガスから前記化合物を効
率よく分解除去することができ、優れた脱臭効果を得る
ことができる。According to the present invention, it is possible to efficiently decompose and remove hydrogen sulfide, methyl mercaptan, methyl sulfide and methyl disulfide from malodorous gas containing high concentration of sulfur-containing compounds. A deodorizing effect can be obtained.
【図１】本発明に係る悪臭ガスの生物的処理方法の一実
施形態例のフローシート（実施例１）FIG. 1 is a flow sheet (Example 1) of one embodiment of a biological treatment method for a malodorous gas according to the present invention.
１，３：生物脱臭塔 ２，４：充填層
５：悪臭ガス送入管 ６：移送管 ７：処理ガス排出管 ８：処
理ガス還流管 ９：散水管 １０：排水管 １１：還
流用ファン1,3: biological deodorization tower 2,4: packed bed
5: Odor gas inlet pipe 6: Transfer pipe 7: Processing gas discharge pipe 8: Processing gas recirculation pipe 9: Sprinkling pipe 10: Drain pipe 11: Recirculation fan
Claims (3)
含む悪臭ガスを通過させ、悪臭物質を生物的に分解して
処理し、処理されたガスの一部を排出するとともに一部
を前記充填層に還流し、前記の悪臭ガスと併せて再度処
理することを特徴とする、悪臭ガスの生物的処理方法。1. A malodorous gas containing a sulfur-containing compound is passed through a packed bed carrying microorganisms to decompose and treat malodorous substances biologically. A biological treatment method for malodorous gas, comprising refluxing the packed bed and treating again with the malodorous gas.
けて含硫黄化合物を含む悪臭ガスを通過させ、前段の充
填層において主に硫化水素を分解し、後段の充填層にお
いて残余の比較的難分解性含硫黄化合物を硫化水素とそ
の残基とに生物的に分解して処理し、処理されたガスの
一部を排出するとともに一部を前段の充填層に還流し、
前記の悪臭ガスと併せて再度処理することを特徴とす
る、悪臭ガスの生物的処理方法。2. A packed bed carrying microorganisms is provided in at least two stages, through which a malodorous gas containing a sulfur-containing compound is allowed to pass, mainly hydrogen sulfide is decomposed in the former packed bed, and the remaining in the latter packed bed is compared. Biologically decomposes the hardly decomposable sulfur-containing compound into hydrogen sulfide and its residues and treats them, and discharges a part of the treated gas and refluxes a part of the gas to the preceding packed bed,
A biological treatment method for malodorous gas, comprising re-treating the gas together with the malodorous gas.
填層のｐＨを６．５〜７．５に調整することを特徴とす
る、請求項２に記載の悪臭ガスの生物的処理方法。3. The organism of claim 2, wherein the pH of the first packed bed is adjusted to 2-3 and the pH of the second packed bed is adjusted to 6.5-7.5. Processing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28386396A JP3802161B2 (en) | 1996-10-25 | 1996-10-25 | Biological treatment of malodorous gases |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28386396A JP3802161B2 (en) | 1996-10-25 | 1996-10-25 | Biological treatment of malodorous gases |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10128042A true JPH10128042A (en) | 1998-05-19 |
| JP3802161B2 JP3802161B2 (en) | 2006-07-26 |
Family
ID=17671157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28386396A Expired - Fee Related JP3802161B2 (en) | 1996-10-25 | 1996-10-25 | Biological treatment of malodorous gases |
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| JP (1) | JP3802161B2 (en) |
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- 1996-10-25 JP JP28386396A patent/JP3802161B2/en not_active Expired - Fee Related
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| JP2014008493A (en) * | 2012-07-03 | 2014-01-20 | Ebara Jitsugyo Co Ltd | Device and method for biological desulfurization of biogas |
| JP2015116514A (en) * | 2013-12-17 | 2015-06-25 | 荏原実業株式会社 | Device and method for biological desulfurization |
| WO2015108018A1 (en) * | 2014-01-16 | 2015-07-23 | 荏原実業株式会社 | Biological desulfurization device and desulfurization method |
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| JP2017154044A (en) * | 2016-02-29 | 2017-09-07 | 荏原実業株式会社 | Desulfurization system and desulfurization method |
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| Publication number | Publication date |
|---|---|
| JP3802161B2 (en) | 2006-07-26 |
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