JP2005262182A - Anaerobic treatment apparatus - Google Patents

Anaerobic treatment apparatus Download PDF

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JP2005262182A
JP2005262182A JP2004083011A JP2004083011A JP2005262182A JP 2005262182 A JP2005262182 A JP 2005262182A JP 2004083011 A JP2004083011 A JP 2004083011A JP 2004083011 A JP2004083011 A JP 2004083011A JP 2005262182 A JP2005262182 A JP 2005262182A
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JP4299168B2 (en
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Fumio Kohama
文夫 小濱
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Sumitomo Heavy Industries Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an anaerobic treatment apparatus capable of effectively performing an anaerobic treatment by sufficiently enhancing a bioactivity of a bacterial cell in an anaerobic treatment tank. <P>SOLUTION: The anaerobic treatment apparatus 1 has an acid generation tank 3 for treating water to be treated with acid generation fungus, the anaerobic treatment tank 5 for anaerobically treating the water treated in the acid generation tank 3, a desulfurization device 7 for desulfurizing a gas generated in the anaerobic treatment tank 5, a gas-liquid contact device 9 for contacting anaerobically treated liquid treated in the anaerobic treatment tank 5 with the treated gas treated by the desulfurization device, a line L5 as a supply passage for supplying a part of the desulfurized liquid treated by the gas-liquid contact device 9 to the post stage, and a Line L6 as a return passage for returning the remaining part of the desulfurized liquid to the acid generation tank 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は嫌気性処理装置に関する。   The present invention relates to an anaerobic treatment apparatus.

嫌気性処理装置においては、嫌気性処理槽中の菌体の生物活性が硫化水素によって阻害されないよう嫌気性処理槽に導入する被処理水の硫黄化合物（例えば硫酸等）の濃度は低く抑えることが好ましい。従来、嫌気性処理槽の前段の調整槽において被処理水をメタンガス等で曝気し、硫黄化合物の還元により生成された硫化水素の濃度を低減させ、結果として嫌気性処理槽に導入する被処理水の硫黄化合物濃度を低減させた嫌気性処理装置が知られている（例えば、特許文献１参照。）。
特開平７−１４８４９５号公報 In an anaerobic treatment apparatus, the concentration of sulfur compounds (for example, sulfuric acid) of water to be treated introduced into the anaerobic treatment tank should be kept low so that the biological activity of the cells in the anaerobic treatment tank is not inhibited by hydrogen sulfide. preferable. Conventionally, water to be treated is aerated with methane gas or the like in an adjustment tank in front of an anaerobic treatment tank to reduce the concentration of hydrogen sulfide generated by reduction of sulfur compounds, and as a result, the water to be treated is introduced into the anaerobic treatment tank. An anaerobic treatment apparatus in which the concentration of sulfur compounds is reduced is known (for example, see Patent Document 1).
JP-A-7-148495

しかしながら、特許文献１の嫌気性処理装置において、調整槽では硫黄化合物の硫化水素への還元はあまり起こらないので、調整槽の被処理水においては硫化水素濃度が比較的低い。従って、被処理水中の硫化水素をメタンガス等での曝気により取り除くことで硫黄化合物を多少低減することはできても、大部分の硫黄化合物は取り除かれないので、調整槽での被処理水の脱硫の効率はあまり高くない。このため、上記嫌気性処理装置では、嫌気性処理槽に導入する被処理水の硫黄化合物濃度を充分に低減することができず、嫌気性処理槽中の菌体の生物活性を充分に高めることができないという問題があった。   However, in the anaerobic treatment apparatus of Patent Document 1, since the reduction of sulfur compounds to hydrogen sulfide does not occur much in the adjustment tank, the hydrogen sulfide concentration is relatively low in the water to be treated in the adjustment tank. Therefore, even though sulfur compounds can be reduced somewhat by removing hydrogen sulfide in the water to be treated by aeration with methane gas, etc., most of the sulfur compounds are not removed. Is not very efficient. For this reason, in the said anaerobic processing apparatus, the sulfur compound density | concentration of the to-be-processed water introduce | transduced into an anaerobic processing tank cannot fully be reduced, but fully raises the biological activity of the microbial cell in an anaerobic processing tank. There was a problem that could not.

そこで、本発明は、嫌気性処理槽中の菌体の生物活性を充分に高め、効率のよい嫌気性処理を行うことが可能な嫌気性処理装置を提供することを目的とする。   Then, an object of this invention is to provide the anaerobic processing apparatus which can fully raise the biological activity of the microbial cell in an anaerobic processing tank, and can perform an efficient anaerobic process.

上記課題を解決するため、本発明の嫌気性処理装置は、被処理水を酸生成菌で処理する酸生成槽と、酸生成槽で処理された処理液を嫌気性処理する嫌気性処理槽と、嫌気性処理槽で発生したガスを脱硫処理する脱硫装置と、嫌気性処理槽で処理された嫌気性処理液を脱硫装置で処理された処理ガスに接触させて脱硫処理する気液接触装置と、気液接触装置で処理された脱硫処理液の一部を後段へ供給する供給路と、脱硫処理液の残りの一部を酸生成槽へ返送する返送路と、を備えている。   In order to solve the above problems, an anaerobic treatment apparatus of the present invention includes an acid generation tank for treating water to be treated with acid-producing bacteria, an anaerobic treatment tank for anaerobically treating a treatment liquid treated in the acid generation tank, and A desulfurization apparatus that desulfurizes the gas generated in the anaerobic treatment tank, and a gas-liquid contact apparatus that desulfurizes the anaerobic treatment liquid treated in the anaerobic treatment tank by contacting the treatment gas treated in the desulfurization apparatus; And a supply path for supplying a part of the desulfurization treatment liquid processed by the gas-liquid contact device to the subsequent stage, and a return path for returning the remaining part of the desulfurization treatment liquid to the acid generation tank.

この嫌気性処理装置によれば、嫌気性処理槽で処理された嫌気性処理水が気液接触装置において気液接触される。嫌気性処理水は、嫌気性処理槽中での硫黄化合物の還元反応により硫化水素濃度が高くなっているので、気液接触装置における脱硫の効率が高く、硫化水素濃度が低減された脱硫処理水が得られる。この脱硫処理水の一部が再び酸生成槽に戻されるので、被処理水が酸生成槽中で希釈され、嫌気性処理槽へ導入される被処理水の硫黄化合物濃度が低く抑えられる。   According to this anaerobic treatment device, the anaerobic treated water treated in the anaerobic treatment tank is brought into gas-liquid contact in the gas-liquid contact device. Anaerobic treated water has a high hydrogen sulfide concentration due to the reduction reaction of sulfur compounds in the anaerobic treatment tank. Therefore, the desulfurized treated water has high desulfurization efficiency in the gas-liquid contact device and reduced hydrogen sulfide concentration. Is obtained. Since a part of this desulfurized water is returned to the acid generation tank again, the water to be treated is diluted in the acid generation tank, and the concentration of sulfur compounds in the water to be treated introduced into the anaerobic treatment tank is kept low.

本発明によれば、嫌気性処理槽中の菌体の生物活性を充分に高め、効率のよい嫌気性処理を行うことが可能な嫌気性処理装置を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the anaerobic processing apparatus which can fully raise the biological activity of the microbial cell in an anaerobic processing tank, and can perform an efficient anaerobic processing can be provided.

以下、本発明の実施の形態について説明する。なお、同一要素には同一符号を用い、重複する説明は省略する。   Embodiments of the present invention will be described below. In addition, the same code | symbol is used for the same element and the overlapping description is abbreviate | omitted.

図１は、本発明の実施形態に係る嫌気性処理装置１の構成を示す図である。嫌気性処理装置１は、硫黄化合物を含む有機性排水を処理する処理装置であり、図に示すようにこの嫌気性処理装置１は、酸生成槽３と嫌気性処理槽５と脱硫装置７と気液接触装置９とガスホルダー１１とを備えている。   FIG. 1 is a diagram showing a configuration of an anaerobic treatment apparatus 1 according to an embodiment of the present invention. The anaerobic treatment apparatus 1 is a treatment apparatus that treats organic wastewater containing sulfur compounds. As shown in the figure, the anaerobic treatment apparatus 1 includes an acid generation tank 3, an anaerobic treatment tank 5, a desulfurization apparatus 7, and the like. A gas-liquid contact device 9 and a gas holder 11 are provided.

酸生成槽３は、槽内に酸生成菌を保持しており、導入される被処理水中の有機物を酸生成菌の働きで分解して低級脂肪酸を生成する槽である。酸生成槽３には、被処理水を導入するラインＬ１と、処理された処理液を嫌気性処理槽５へ送るラインＬ２とが接続されている。   The acid production tank 3 is a tank that holds acid producing bacteria in the tank and decomposes the organic matter in the treated water to be introduced by the action of the acid producing bacteria to produce lower fatty acids. The acid generation tank 3 is connected to a line L1 for introducing the water to be treated and a line L2 for sending the treated liquid to the anaerobic treatment tank 5.

嫌気性処理槽５は、槽内にメタン生成菌等の嫌気性菌を含むグラニュール汚泥５１を保持しており、酸生成槽３から送られた処理液中の低級脂肪酸をメタン生成菌によって分解し、メタンガス等を発生させる槽である。嫌気性処理槽５としては、例えば上向流式の嫌気性処理槽が用いられる。上向流式の嫌気性処理槽としては、例えば上向流嫌気汚泥床（ＵＡＳＢ＝Upflow Anaerobic Sludge Blanket）式、上向流嫌気流動床（ＥＧＳＢ＝Expanded Granular Sludge Bed）式、固定床式のものが挙げられる。これらを用いるのは、容積負荷が高く、嫌気性処理槽５の小型化が可能であるという理由による。これらのうち、より容積負荷が高い点から、好ましくはＵＡＳＢ式、ＥＧＳＢ式の嫌気性処理槽が用いられる。なお、図１には、ＵＡＳＢ式の嫌気性処理槽５が示されている。嫌気性処理槽５には、酸生成槽３からの処理液を導入するラインＬ２と、処理後の嫌気性処理液を気液接触装置９へ送るラインＬ３と、槽内で発生したガスを脱硫装置７へ送るラインＬ１１とが接続されている。   The anaerobic treatment tank 5 holds granule sludge 51 containing anaerobic bacteria such as methanogens in the tank, and decomposes lower fatty acids in the treatment liquid sent from the acid production tank 3 by the methanogens. It is a tank that generates methane gas and the like. As the anaerobic treatment tank 5, for example, an upward flow type anaerobic treatment tank is used. For example, an upflow anaerobic sludge bed (UASB = Upflow Anaerobic Sludge Blanket) type, an upflow anaerobic fluidized bed (EGSB = Expanded Granular Sludge Bed) type, a fixed bed type Is mentioned. These are used because the volume load is high and the anaerobic treatment tank 5 can be downsized. Of these, UASB type and EGSB type anaerobic treatment tanks are preferably used because of their higher volumetric load. FIG. 1 shows a UASB type anaerobic treatment tank 5. In the anaerobic treatment tank 5, a line L 2 for introducing the treatment liquid from the acid generation tank 3, a line L 3 for sending the treated anaerobic treatment liquid to the gas-liquid contact device 9, and a gas generated in the tank are desulfurized. A line L11 to be sent to the device 7 is connected.

脱硫装置７は、導入されたガスから硫化水素ガスを除去する装置である。例えば、脱硫装置７としては、硫化水素ガスを吸着する吸着剤７１を保持する乾式脱硫装置が用いられ、嫌気性処理槽５から送られたガスを吸着剤７１と接触させることにより、硫化水素ガスを吸着剤に吸着させて除去する。この吸着剤７１としては、例えば酸化鉄含有の脱硫剤が用いられる。脱硫装置７には、嫌気性処理槽５からガスを導入するラインＬ１１と、脱硫された処理ガスを気液接触装置９へ送るラインＬ１２とが接続されている。なお、ここでは脱硫装置７として乾式脱硫装置の例を挙げたが、脱硫装置７としては湿式脱硫装置あるいは生物式脱硫装置が併用されてもよい。   The desulfurization device 7 is a device that removes hydrogen sulfide gas from the introduced gas. For example, as the desulfurization apparatus 7, a dry desulfurization apparatus that holds an adsorbent 71 that adsorbs hydrogen sulfide gas is used, and hydrogen sulfide gas is obtained by bringing the gas sent from the anaerobic treatment tank 5 into contact with the adsorbent 71. Is removed by adsorbing to the adsorbent. As this adsorbent 71, for example, a desulfurization agent containing iron oxide is used. Connected to the desulfurization apparatus 7 are a line L11 for introducing gas from the anaerobic treatment tank 5 and a line L12 for sending the desulfurized process gas to the gas-liquid contact apparatus 9. Here, although an example of a dry desulfurization apparatus has been given as the desulfurization apparatus 7, a wet desulfurization apparatus or a biological desulfurization apparatus may be used as the desulfurization apparatus 7.

気液接触装置９は、嫌気性処理槽５で処理された嫌気性処理液と脱硫装置７からの処理ガスとを気液接触させ、嫌気性処理液から硫化水素を除去する装置である。例えば、気液接触装置９は、嫌気性処理液を貯留する貯留部９１と、貯留部下部に処理ガスを吹き込むガス導入部９３を有している。この場合、気液接触装置９内では、ガス導入部９３から吹き込まれた処理ガスが気泡となって貯留部を上昇しながら貯留部９１中の嫌気性処理液と接触し、嫌気性処理液中に溶存している硫化水素が気体となって処理ガス中に移行することにより嫌気性処理液から硫化水素が除去される。気液接触装置９には、嫌気性処理槽５からの嫌気性処理液を導入するラインＬ３と、硫化水素が除去された嫌気性処理液を脱硫処理液として排出するラインＬ４と、脱硫装置７からのガスをガス導入部９３へ送るラインＬ１２と、気液接触後のガスを排出しガスホルダー１１へ送るラインＬ１３とが接続されている。   The gas-liquid contact device 9 is a device that removes hydrogen sulfide from the anaerobic treatment liquid by bringing the anaerobic treatment liquid treated in the anaerobic treatment tank 5 into contact with the treatment gas from the desulfurization apparatus 7. For example, the gas-liquid contact device 9 includes a storage unit 91 that stores an anaerobic processing liquid, and a gas introduction unit 93 that blows processing gas into a lower portion of the storage unit. In this case, in the gas-liquid contact device 9, the processing gas blown from the gas introduction unit 93 becomes bubbles and comes into contact with the anaerobic processing liquid in the storage unit 91 while ascending the storage unit. Hydrogen sulfide dissolved in the gas is converted into gas and transferred into the processing gas, whereby hydrogen sulfide is removed from the anaerobic processing liquid. The gas-liquid contact device 9 includes a line L3 for introducing the anaerobic treatment liquid from the anaerobic treatment tank 5, a line L4 for discharging the anaerobic treatment liquid from which hydrogen sulfide has been removed as a desulfurization treatment liquid, and a desulfurization device 7 The line L12 for sending the gas from the gas to the gas introduction part 93 and the line L13 for discharging the gas after gas-liquid contact and sending it to the gas holder 11 are connected.

ガスホルダー１１は、ラインＬ１３から送られるガスを貯留するとともに、ラインＬ１４へガスを送り出す機能を有する。ラインＬ１４から排出されたガスは、例えば、資源として再利用され、又は焼却により処理される。   The gas holder 11 has a function of storing the gas sent from the line L13 and sending the gas to the line L14. The gas discharged from the line L14 is reused as a resource or processed by incineration, for example.

ラインＬ４は、脱硫処理液の一部を嫌気性処理装置１の後段の処理装置（図示せず）へ供給する供給路としてのラインＬ５と、脱硫処理液の残りの一部を酸生成槽３へ返送する返送路としてのラインＬ６と、に分岐している。上記後段の処理装置としては、好気性処理装置等が用いられる。   The line L4 is a line L5 serving as a supply path for supplying a part of the desulfurization treatment liquid to a subsequent treatment apparatus (not shown) of the anaerobic treatment apparatus 1 and the remaining part of the desulfurization treatment liquid in the acid generation tank 3. Branches to a line L6 as a return path to be returned to. An aerobic processing device or the like is used as the latter processing device.

以下、上記した嫌気性処理装置１の作用及び効果について説明する。まず、硫酸等の硫黄化合物を含む有機性の被処理水がラインＬ１を通じて酸生成槽３へ導入される。酸生成槽３では被処理水中の有機物が低級脂肪酸へと分解される。酸生成槽３で処理された処理液はラインＬ２を通じて嫌気性処理槽５へ送られる。嫌気性処理槽５においては、メタン生成菌により低級脂肪酸等が分解され、メタン及び二酸化炭素が発生すると共に硫黄化合物の還元反応により硫化水素が発生する。硫化水素は嫌気性処理槽５内において気体として発生すると共に、処理液中にも溶存する。すなわち、嫌気性処理槽５においては、処理液中の硫酸等の硫黄化合物の還元が促進され、硫化水素として存在する割合が増加することとなる。上記の嫌気性処理槽５で発生したガスはメタンガス、二酸化炭素、硫化水素ガスを主成分とする混合ガスであり、ラインＬ１１を通じて脱硫装置７へ送られる。脱硫装置７ではこれらの混合ガス中から硫化水素ガスが除去されるので処理後の処理ガスは硫化水素ガスが希薄となったメタンガス、二酸化炭素を主成分とする混合ガスとなり、ラインＬ１２を通じて気液接触装置９へ送られる。   Hereinafter, the operation and effect of the above-described anaerobic treatment apparatus 1 will be described. First, organic water to be treated containing a sulfur compound such as sulfuric acid is introduced into the acid generation tank 3 through the line L1. In the acid generation tank 3, organic substances in the water to be treated are decomposed into lower fatty acids. The treatment liquid treated in the acid generation tank 3 is sent to the anaerobic treatment tank 5 through the line L2. In the anaerobic treatment tank 5, lower fatty acids and the like are decomposed by the methane-producing bacteria, methane and carbon dioxide are generated, and hydrogen sulfide is generated by the reduction reaction of the sulfur compound. Hydrogen sulfide is generated as a gas in the anaerobic treatment tank 5 and dissolved in the treatment liquid. That is, in the anaerobic treatment tank 5, the reduction of sulfur compounds such as sulfuric acid in the treatment liquid is promoted, and the ratio of existing as hydrogen sulfide increases. The gas generated in the anaerobic treatment tank 5 is a mixed gas mainly composed of methane gas, carbon dioxide, and hydrogen sulfide gas, and is sent to the desulfurizer 7 through the line L11. Since the hydrogen sulfide gas is removed from these mixed gases in the desulfurization apparatus 7, the treated gas becomes a mixed gas mainly composed of methane gas and carbon dioxide in which the hydrogen sulfide gas is diluted, and is gas-liquid through a line L12. It is sent to the contact device 9.

一方、嫌気性処理槽５で処理された嫌気性処理液はラインＬ３を通じて気液接触装置９へ送られ、処理ガスと接触する。このとき、処理ガスは脱硫装置７での処理により硫化水素ガスが希薄とされているので、気液接触装置９では嫌気性処理液中に溶存する硫化水素が効率よくガスとなって処理ガス中に移行する。このように、嫌気性処理液中の硫化水素が効率よく除去され、硫黄分が希薄となった脱硫処理液としてラインＬ４に排出される。なお、嫌気性処理液中の硫黄化合物は上述の通り硫化水素として存在する割合が増加しており、この硫化水素は気液接触によって取り除かれるので、気液接触装置９においては硫黄化合物の除去が効率よく行われることとなる。   On the other hand, the anaerobic processing liquid processed in the anaerobic processing tank 5 is sent to the gas-liquid contact device 9 through the line L3 and contacts the processing gas. At this time, since the hydrogen sulfide gas is diluted by the treatment in the desulfurization apparatus 7 at this time, the hydrogen sulfide dissolved in the anaerobic treatment liquid is efficiently converted into a gas in the treatment gas in the gas-liquid contact apparatus 9. Migrate to In this way, hydrogen sulfide in the anaerobic treatment liquid is efficiently removed and the desulfurization treatment liquid in which the sulfur content is diluted is discharged to the line L4. As described above, the sulfur compound in the anaerobic treatment liquid has increased in proportion as hydrogen sulfide, and since this hydrogen sulfide is removed by gas-liquid contact, the gas-liquid contact device 9 can remove the sulfur compound. It will be done efficiently.

ラインＬ４からの脱硫処理液は、一部がラインＬ５を通じて後段の処理へ供給されると共に、残りの一部がラインＬ６を通じて酸生成槽３へ再び返送される。このように硫黄分が希薄となった脱硫処理液が酸生成槽３内の被処理水と混合されるので、全体として被処理水の硫黄化合物濃度が低くなる。よって、ラインＬ２を通じて嫌気性処理槽５に導入される被処理水の硫黄化合物濃度が低く抑えられる。その結果、上記嫌気性処理装置１によれば、嫌気性処理槽５中の菌体の生物活性を充分に高め、効率のよい嫌気性処理を行うことが可能となる。   A part of the desulfurization treatment liquid from the line L4 is supplied to the subsequent process through the line L5, and the remaining part is returned again to the acid generation tank 3 through the line L6. Thus, since the desulfurization processing liquid in which sulfur content became thin is mixed with the to-be-processed water in the acid production tank 3, the sulfur compound density | concentration of to-be-processed water becomes low as a whole. Therefore, the sulfur compound concentration of the water to be treated introduced into the anaerobic treatment tank 5 through the line L2 can be kept low. As a result, according to the anaerobic treatment apparatus 1, it is possible to sufficiently increase the biological activity of the cells in the anaerobic treatment tank 5 and perform an efficient anaerobic treatment.

また、嫌気性処理装置１によれば、ラインＬ５とラインＬ６との流量比を調節することにより、酸生成槽３中の硫黄化合物濃度を調節することができ、ラインＬ２を通じて嫌気性処理槽５に導入される被処理水の硫黄化合物濃度を制御することが可能となる。   Moreover, according to the anaerobic processing apparatus 1, the sulfur compound density | concentration in the acid production tank 3 can be adjusted by adjusting the flow rate ratio of the line L5 and the line L6, and the anaerobic processing tank 5 through the line L2. It becomes possible to control the sulfur compound concentration of the water to be treated introduced into the water.

また、この嫌気性処理装置１によれば、ラインＬ５を通じて後段へ送られる処理水が、気液接触装置９で処理され硫黄化合物濃度が低減されているので、例えば好気性処理といった後段の処理における負荷が低く抑えられる。   Moreover, according to this anaerobic processing apparatus 1, since the treated water sent to the back | latter stage through the line L5 is processed by the gas-liquid contact apparatus 9, and the sulfur compound density | concentration is reduced, for example in the back | latter stage processes, such as an aerobic process, The load can be kept low.

また、この嫌気性処理装置１では、気液接触装置９においては、ガス導入部９３から吹き込む気体として、嫌気性処理槽５で発生した混合ガスを処理した処理ガスを用いている。この処理ガスはメタンガス、二酸化炭素が主成分であり酸素をほとんど含んでいないので、外部の空気をガス導入部９３から吹き込む場合に比して、ラインＬ６を通じて酸生成槽３へ返送される脱硫処理液に酸素が含有されることが抑制され、嫌気性処理槽５に阻害物質である酸素が導入されることを防止することができる。   Moreover, in this anaerobic processing apparatus 1, in the gas-liquid contact apparatus 9, the process gas which processed the mixed gas generated in the anaerobic processing tank 5 is used as a gas blown from the gas introduction part 93. FIG. Since this process gas is mainly composed of methane gas and carbon dioxide and contains almost no oxygen, the desulfurization process is returned to the acid generation tank 3 through the line L6 as compared with the case where external air is blown from the gas introduction part 93. Oxygen is suppressed from being contained in the liquid, and oxygen as an inhibitor can be prevented from being introduced into the anaerobic treatment tank 5.

嫌気性処理装置の構成を示す図である。It is a figure which shows the structure of an anaerobic processing apparatus.

符号の説明Explanation of symbols

１…嫌気性処理装置、３…酸生成槽、５…嫌気性処理槽、７…脱硫装置、９…気液接触装置、Ｌ５…ライン（供給路）、Ｌ６…ライン（返送路）。   DESCRIPTION OF SYMBOLS 1 ... Anaerobic processing apparatus, 3 ... Acid production tank, 5 ... Anaerobic processing tank, 7 ... Desulfurization apparatus, 9 ... Gas-liquid contact apparatus, L5 ... Line (supply path), L6 ... Line (return path).

Claims (1)

被処理水を酸生成菌で処理する酸生成槽と、
前記酸生成槽で処理された処理液を嫌気性処理する嫌気性処理槽と、
前記嫌気性処理槽で発生したガスを脱硫処理する脱硫装置と、
前記嫌気性処理槽で処理された嫌気性処理液を前記脱硫装置で処理された処理ガスに接触させて脱硫処理する気液接触装置と、
前記気液接触装置で処理された脱硫処理液の一部を後段へ供給する供給路と、
前記脱硫処理液の残りの一部を前記酸生成槽へ返送する返送路と、
を備えた嫌気性処理装置。 An acid production tank for treating the water to be treated with acid producing bacteria;
An anaerobic treatment tank for anaerobically treating the treatment liquid treated in the acid generation tank;
A desulfurization apparatus for desulfurizing the gas generated in the anaerobic treatment tank;
A gas-liquid contact device that performs a desulfurization treatment by bringing the anaerobic treatment liquid treated in the anaerobic treatment tank into contact with the treatment gas treated in the desulfurization device;
A supply path for supplying a part of the desulfurization treatment liquid treated by the gas-liquid contact device to a subsequent stage;
A return path for returning the remaining part of the desulfurization treatment liquid to the acid generation tank;
An anaerobic treatment apparatus equipped with.
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