JP2006305458A - Methane fermentation method and device using horizontal type multistage methane fermentation tank - Google Patents

Methane fermentation method and device using horizontal type multistage methane fermentation tank Download PDF

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JP2006305458A
JP2006305458A JP2005130796A JP2005130796A JP2006305458A JP 2006305458 A JP2006305458 A JP 2006305458A JP 2005130796 A JP2005130796 A JP 2005130796A JP 2005130796 A JP2005130796 A JP 2005130796A JP 2006305458 A JP2006305458 A JP 2006305458A
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methane fermentation
tank
treated water
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water
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JP4577719B2 (en
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Takayuki Suzuki
隆幸 鈴木
Shunichi Shiono
俊一 塩野
Hideki Harada
秀樹 原田
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Ebara Corp
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    • 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
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a methane fermentation method using a horizontal multistage fermentation tank where scum in a methane fermentation tank can be easily and effectively discharged, and to provide a device therefor. <P>SOLUTION: In the methane fermentation method using a horizontal multistage methane fermentation tank 14 where each overflow plate 18 and each detour flow plate 17 in which the lower part has a gap in a space with the bottom plate of the tank and the upper part lies on the water face are alternately arranged, the water to be treated is subjected to fermentation treatment as a bypass flow is formed from an inflow port toward the flowing-down direction un and down, and the treated water is discharged from an outflow port 12, the outflow port 12 is intermittently closed, thus the water level of the liquid in the methane fermentation tank is more elevated than the tip of the detour flow plate 17, and thereafter, the outflow port 12 is opened, so as to discharge scum 15 at the upper part in the fermentation tank. It is possible that the inflow ports and the outflow ports are arranged on both the edge parts of the methane fermentation tank, respectively, the water to be treated is alternately poured from the inflow ports on both the edge parts, and the treated water is alternately discharged from the outflow ports on the confronted edges. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、メタン発酵処理する技術に係り、特に、廃水を横型多段メタン発酵槽を用いて処理するメタン発酵方法と装置に関する。   The present invention relates to a technology for methane fermentation treatment, and more particularly, to a methane fermentation method and apparatus for treating wastewater using a horizontal multi-stage methane fermentation tank.

横型多段メタン発酵槽は、数十年前に開発された技術である。構造は、流入廃水を上下方向に迂流が形成されるように、板で多段に区画形成されており、槽底部に蓄積したメタン菌グラニュール（塊状物）によって有機物がメタンに転換され、廃水が浄化される。メタン菌グラニュールは、多段槽各部の上昇流による回転運動により、ほとんどが球状の大小の塊状物となる。塊状物は、浮遊状のメタン菌に比較して、その濃度が１０倍以上に濃縮されているため、メタン発酵速度も浮遊式のメタン発酵方式に比較して１０倍以上高速であり、高負荷のメタン発酵を行うことができる。横型多段メタン発酵には、メタンを大気放散する開放型と、密閉してメタンを回収する密閉式がある。メタンは、強力な地球温暖化ガスであり、またエネルギー回収の点からも密閉式による方式を採用することが望ましい。汚泥、畜産廃水等に多用されている浮遊式メタン発酵方式では、槽内の撹拌及びスカムの破壊のため、ガス撹拌、機械撹拌、水流撹拌等の撹拌設備を付帯している。一方、横型多段メタン発酵は、高負荷処理が可能なため、単位容積当たりのガス発生量が多く、ガスの上昇流によって形成される流れにより撹拌されるため、撹拌装置は付帯していない。   The horizontal multi-stage methane fermenter is a technology developed several decades ago. The structure is divided into multiple stages with plates so that the inflow wastewater can be diverted in the vertical direction, and the organic matter is converted to methane by the methane fungus granules (lumps) accumulated at the bottom of the tank. Is purified. Most of the methane bacteria granules become spherical large and small lumps due to the rotational movement caused by the upward flow of each part of the multistage tank. The mass of the lumps is concentrated 10 times or more compared to floating methane bacteria, so the methane fermentation rate is more than 10 times faster than the floating methane fermentation method, and the load is high. Methane fermentation. Horizontal multistage methane fermentation includes an open type that releases methane to the atmosphere and a closed type that collects methane and seals it. Methane is a powerful global warming gas, and it is desirable to adopt a sealed system from the viewpoint of energy recovery. The floating methane fermentation system, which is frequently used for sludge, livestock wastewater, etc., is equipped with stirring equipment such as gas stirring, mechanical stirring, and water flow stirring to agitate the tank and destroy the scum. On the other hand, horizontal multi-stage methane fermentation is capable of high-load processing, and therefore generates a large amount of gas per unit volume and is agitated by a flow formed by an upward flow of gas.

横型多段メタン発酵装置内液は、自動的に撹拌されるものの、廃水中にSS(浮遊固形物)が多いと、ガスによって浮上分離したSSが蓄積してスカムが形成される。スカムが成長すると、メタン発酵槽気相部に充満して、メタンガス流出口、流出配管を閉塞すると共に、液相部の有効容積を減少して処理に重大な障害を及ぼすため、スカムの簡易かつ合理的な排出方法を実用化することが課題となっていた。また、大量のスカムが蓄積して腐敗すると、高濃度のアンモニア、有機酸等が液相及び気相に移行し、処理水質、バイオガス性状を悪化させる。これはスカムが高濃度であるため、分解に際してメタン菌に有害なアンモニア、有機酸等も高濃度になるため、分解作用による低分子化反応がメタン発酵の前段で停止してしまうためである。スカムの破壊方法として、前記各撹拌方法の他、液散布等があるが、ポンプ、散布ノズル、配管等の設備が必要となり、消費動力も多くなる。
特開平１１−７７００５号公報 Although the liquid in the horizontal multistage methane fermentation apparatus is automatically agitated, if there is a lot of SS (floating solids) in the wastewater, SS floated and separated by gas accumulates to form scum. As the scum grows, it fills the gas phase part of the methane fermenter, closes the methane gas outlet and the outflow piping, and reduces the effective volume of the liquid phase part, causing a serious obstacle to processing. There has been a problem of putting a rational discharge method into practical use. In addition, when a large amount of scum accumulates and decays, high-concentration ammonia, organic acid, and the like shift to the liquid phase and gas phase, thereby deteriorating the quality of treated water and biogas properties. This is because, since scum is high in concentration, ammonia, organic acids, and the like harmful to methane bacteria also become high in decomposition, so that the low molecular weight reaction due to decomposition action stops in the previous stage of methane fermentation. As a method for destroying scum, in addition to the above stirring methods, there are liquid spraying and the like, but facilities such as a pump, a spray nozzle, and piping are required, and power consumption increases.
JP-A-11-77005

本発明は、上記従来技術に鑑み、メタン発酵槽内のスカムを簡易に、効果的に排出することができる横型多段メタン発酵槽を用いるメタン発酵方法と装置を提供することを課題とする。   This invention makes it a subject to provide the methane fermentation method and apparatus using the horizontal multistage methane fermenter which can discharge | emit the scum in a methane fermenter simply and effectively in view of the said prior art.

上記課題を解決するため、本発明では、溢流板と、下部が槽の底板との間に空隙を有し上部が水面上にある迂流板とを交互に配置して、被処理水を流入口から流下方向に上下に迂流を形成しながら発酵処理して、処理水を流出口から排出する横型多段メタン発酵槽を用いるメタン発酵方法において、間欠的に該流出口を閉めることにより、前記メタン発酵槽内液の水位を前記迂流板の頂部よりも上昇せしめたのち、該流出口を開けて発酵槽内上部のスカムを排出することを特徴とするメタン発酵方法としたものである。
また、本発明では、溢流板と、下部が槽の底板との間に空隙を有し上部が水面上にある迂流板とを交互に配備し、両端部に被処理水流入口と処理水流出口とを有する横型多段メタン発酵槽において、前記処理水流出口を、開閉可能に配備し、該発酵槽内上部のスカムを排出するために間欠的に該流出口を開閉する手段を設けたことを特徴とするメタン発酵装置としたものである。
前記本発明において、流入口と流出口を、前記メタン発酵槽の両端部にそれぞれ配備し、該両端部の流入口から交互に被処理水を注入し、対向端の流出口から交互に処理水を排出することができ、また、前記処理水流出口を有する端部には、溢流板を介して処理水槽を設け、該処理水槽には、前記被処理水流入口よりも低位置に処理水流出口を配備することができ、さらに、該処理水槽には、排出するスカムを破壊する撹拌手段を設けることができる。 In order to solve the above problems, in the present invention, the overflow plate and the bypass plate having a gap between the bottom plate and the bottom plate of the tank and having the upper portion on the water surface are alternately arranged, and the water to be treated is disposed. In the methane fermentation method using a horizontal multi-stage methane fermenter that performs fermentation treatment while forming a detour vertically from the inlet to the downstream, and discharges treated water from the outlet, by closing the outlet intermittently, After raising the water level of the liquid in the methane fermentation tank above the top of the bypass plate, the methane fermentation method is characterized by opening the outlet and discharging the scum in the upper part of the fermentation tank. .
In the present invention, an overflow plate and a bypass plate having a gap between the bottom plate and the bottom plate of the tank and having an upper portion on the water surface are alternately arranged, and the treated water inlet and the treated water flow are provided at both ends. In a horizontal multi-stage methane fermentation tank having an outlet, the treated water outlet is provided so as to be openable and closable, and means for intermittently opening and closing the outlet is provided to discharge the scum in the upper part of the fermentation tank. This is a characteristic methane fermentation apparatus.
In the present invention, an inflow port and an outflow port are respectively provided at both ends of the methane fermentation tank, water to be treated is alternately injected from the inflow ports at both ends, and treated water is alternately injected from the outflow port at the opposite end. In addition, a treated water tank is provided at an end having the treated water outlet through an overflow plate, and the treated water outlet is disposed at a position lower than the treated water inlet. Furthermore, the treatment water tank can be provided with a stirring means for destroying the discharged scum.

本発明によって、スカムの蓄積を防止できるので、次のような効果を得ることができる。
（１）バイオガス流出口、流出配管の閉塞を防止することができる。
（２）スカム蓄積によるメタン発酵槽の有効容積の減少を防止することができる。
（３）スカムの腐敗による処理水水質及びバイオガス性状の悪化を防止できる。 Since accumulation of scum can be prevented by the present invention, the following effects can be obtained.
(1) Blockage of the biogas outlet and the outflow piping can be prevented.
(2) Reduction of the effective volume of the methane fermentation tank due to scum accumulation can be prevented.
(3) Deterioration of treated water quality and biogas properties due to scum decay can be prevented.

以下に、本発明を図面を用いて詳細に説明する。
図１は、一端部に被処理水の流入口と処理水の流出口を有する本発明のメタン発酵装置の一例を示す概略構成図であり、図２は、両端部にそれぞれ流入口と流出口を有する本発明のメタン発酵装置の一例を示す概略構成図である。
図において、１，１−１，１−２はそれぞれ被処理水（廃水）流入経路（流入管）、２〜９はそれぞれ発酵槽、１０，１０−１，１０−２はそれぞれ処理水槽、１１はグラニュール堆積槽、１２，１２−１，１２−２はそれぞれ処理水流出経路（流出管）、１３はバイオガス排出経路、１４はメタン発酵槽、１５はスカム、１６，１６−１，１６−２はバルブ、１７は迂流板、１８は溢流板である。 Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing an example of the methane fermentation apparatus of the present invention having an inlet for treated water and an outlet for treated water at one end, and FIG. 2 shows an inlet and an outlet at both ends, respectively. It is a schematic block diagram which shows an example of the methane fermentation apparatus of this invention which has this.
In the figure, 1,1-1,1-2 are treated water (waste water) inflow paths (inflow pipes), 2-9 are fermenters, 10, 10-1, 10-2 are treated water tanks, 11 respectively. Is a granule accumulation tank, 12, 12-1, and 12-2 are treated water outflow paths (outflow pipes), 13 is a biogas discharge path, 14 is a methane fermentation tank, 15 is a scum, 16, 16-1, and 16 -2 is a valve, 17 is a bypass plate, and 18 is an overflow plate.

図１において、廃水流入管１からの廃水は、槽２を下降し、迂流板１７の下部のメタン菌のグラニュール層１１を通過して槽３を上昇し、溢流板１８の上部を溢流して槽４に流入し、順次槽４、５、６、７、８、９を迂流して、グラニュール堆積層１１を通過したのちに、処理水槽１０に貯留される。処理水槽１０の水位は、流出管１２の設置レベルに保たれる。廃水流入管１からの廃水の有機物は、メタンと二酸化炭素に分解され、バイオガス１３としてメタン発酵槽１４から排出される。バイオガス１３は、燃料等に利用される。メタン発酵によって生成したグラニュールの比較的小径のものは、各槽の上昇流に随伴して次槽に移動するため、下流の槽ほどグラニュール堆積層１１の高さが上昇する。メタン発酵槽１４では、ＳＳに微量のバイオガスが付着して上昇し、液面上にスカム１５を形成する。特に、本発明のメタン発酵槽では、表面が撹拌されていないため、スカムを形成しやすい。スカム１５の蓄積高を検知計で検出あるいは予想して、バルブ１６を閉めて流出を停止すると、処理水槽１０の水面は各槽２〜９液面まで上昇し、そのあとさらに水面が上昇して、各水槽２〜１０全体の水面が迂流板１７頂部を越えたのち、バルブ１６を開放することによって、上昇した分の液を処理水槽１０に流下させる。それに伴い、水面上のスカム１５を処理水槽１０に移動することができるので、スカム１５をメタン発酵槽１４外に排除することができる。
スカム１５は、蓄積と共に乾燥して強度が上昇するために、円滑な流下・破壊が妨げられるので、スカム１５が発生して蓄積する初期段階（スカム高５〜１５ｃｍ程度）の状態でバルブ１６を閉めて排出するとよい。スカム高は、静電容量型等の公知のレベル計による自動検出システムあるいは覗窓からの肉眼観察で確認することができる。 In FIG. 1, the waste water from the waste water inflow pipe 1 descends in the tank 2, passes through the granule layer 11 of the methane bacterium at the lower part of the bypass plate 17, rises in the tank 3, After overflowing and flowing into the tank 4, sequentially bypassing the tanks 4, 5, 6, 7, 8, and 9 and passing through the granule deposition layer 11, they are stored in the treated water tank 10. The water level of the treated water tank 10 is maintained at the installation level of the outflow pipe 12. Wastewater organic matter from the wastewater inflow pipe 1 is decomposed into methane and carbon dioxide, and is discharged from the methane fermentation tank 14 as biogas 13. The biogas 13 is used for fuel or the like. Since the granules having a relatively small diameter generated by methane fermentation move to the next tank accompanying the upward flow of each tank, the height of the granule deposition layer 11 increases in the downstream tank. In the methane fermentation tank 14, a small amount of biogas adheres to the SS and rises, forming a scum 15 on the liquid surface. In particular, in the methane fermentation tank of the present invention, since the surface is not stirred, scum is easily formed. When the accumulated height of the scum 15 is detected or predicted by a detector and the valve 16 is closed to stop the outflow, the water level of the treated water tank 10 rises to the liquid level of each tank 2-9, and then the water level rises further. Then, after the water surface of each of the water tanks 2 to 10 exceeds the top of the bypass plate 17, by opening the valve 16, the raised liquid is caused to flow down to the treated water tank 10. Accordingly, the scum 15 on the water surface can be moved to the treated water tank 10, so that the scum 15 can be excluded from the methane fermentation tank 14.
Since the scum 15 dries with accumulation and increases in strength, smooth flow and breakage are hindered. Therefore, the valve 16 is set in an initial stage (scum height of about 5 to 15 cm) where the scum 15 is generated and accumulated. Close and drain. The scum height can be confirmed by an automatic detection system using a known level meter such as a capacitance type or by visual observation from a viewing window.

ＳＳ濃度が比較的高い場合には、グラニュール堆積層１１あるいは菌体・固形物混合堆積層が形成されず、菌体が浮遊していても、スカム１５の排除法として有効である。
処理水槽１０に流入したスカムは、移動時の乱流によって破壊されるが、強固な場合は、機械撹拌、ガス撹拌、水流撹拌等の公知の撹拌機を付帯すればよい。
図１のメタン発酵槽１４は、矩形であるが、構造を円筒形にすることによって槽全体の強度を向上することができる。
図１において、グラニュール堆積層１１の高さは、流下方向に向かって上昇し、最終的には、最終槽９から処理水槽１０にグラニュールが溢流してしまう。これを防止するため、廃水を流入管から逆方向に流入せしめたのが図２に示す方法である。 When the SS concentration is relatively high, the granule deposition layer 11 or the microbial cell / solid mixed deposition layer is not formed, and even if the microbial cells are floating, it is effective as a method for eliminating the scum 15.
The scum that has flowed into the treated water tank 10 is destroyed by the turbulent flow at the time of movement, but if it is firm, a known stirrer such as mechanical stirring, gas stirring, or water stirring may be attached.
The methane fermentation tank 14 of FIG. 1 is rectangular, but the strength of the entire tank can be improved by making the structure cylindrical.
In FIG. 1, the height of the granule deposition layer 11 rises in the flow-down direction, and eventually the granules overflow from the final tank 9 to the treated water tank 10. In order to prevent this, the method shown in FIG. 2 is a method in which wastewater is introduced in the reverse direction from the inflow pipe.

図２において、廃水流入管１−２からの廃水は、槽７に流入し、順次槽６、５、４、３、２を迂流し、処理水槽１０−２に流下し、流出管１２−２を経由してメタン発酵槽１４外に流出する。スカム１５の蓄積高を検知計で検出あるいは予想して、バルブ１６−２を閉めて流出を停止すると、処理水槽１０−２の水面は、各槽２〜７，１０−１の液面まで上昇し、そのあとさらに水面が上昇して、各水槽全体の水面が迂流板１７頂部を越えたのち、バルブ１６−２を開放することによって、上昇した分の液を処理水槽１０−２に流下させる。それに伴い、水面上のスカム１５を処理水槽１０−２に移動することができるので、スカム１５をメタン発酵槽１４外に排除することができる。グラニュール堆積層１１の高さが、槽２で上昇したら、次に廃水を廃水流入管１０−１に切り替えて、槽２に流入せしめて各槽３、４，５，６，７を順次迂流させればよい。処理水は、流出管１２−１を経由して排出される。グラニュール蓄積量の一方側の偏りは、廃水の流下方向を適宜交互に変更することによって修正することができ、槽１４全体の十分量のグラニュールを保持することができるので、安定したメタン発酵を行うことができる。スカム１５の排出も運転に支障が生じないように適宜行えばよい。   In FIG. 2, waste water from the waste water inflow pipe 1-2 flows into the tank 7, sequentially bypasses the tanks 6, 5, 4, 3, and 2, flows down to the treated water tank 10-2, and the outflow pipe 12-2. And then flows out of the methane fermentation tank 14. When the accumulated height of the scum 15 is detected or predicted by a detector and the outflow is stopped by closing the valve 16-2, the water level of the treated water tank 10-2 rises to the liquid level of each tank 2-7, 10-1. After that, the water level further rises, and after the water level of each tank reaches the top of the bypass plate 17, the valve 16-2 is opened to flow the increased liquid down to the treated water tank 10-2. Let Accordingly, the scum 15 on the water surface can be moved to the treated water tank 10-2, so that the scum 15 can be excluded from the methane fermentation tank 14. When the height of the granulated layer 11 rises in the tank 2, the waste water is then switched to the waste water inflow pipe 10-1 and flows into the tank 2 to sequentially bypass the tanks 3, 4, 5, 6 and 7. You can make it flow. The treated water is discharged via the outflow pipe 12-1. The bias on one side of the accumulated amount of granules can be corrected by appropriately changing the flow direction of the wastewater, and a sufficient amount of granules in the entire tank 14 can be maintained, so that stable methane fermentation is possible. It can be performed. The discharge of the scum 15 may be appropriately performed so as not to hinder the operation.

本発明の一端部に流入口と流出口を有するメタン発酵装置の一例を示す概略構成図。The schematic block diagram which shows an example of the methane fermentation apparatus which has an inflow port and an outflow port in the one end part of this invention. 本発明の両端部にそれぞれ流入口と流出口を有するメタン発酵装置の一例を示す概略構成図。The schematic block diagram which shows an example of the methane fermentation apparatus which has an inflow port and an outflow port in the both ends of this invention, respectively.

符号の説明Explanation of symbols

１，１−１，１−２：被処理水（廃水）流入経路（流入管）、２〜９：発酵槽、１０，１０−１，１０−２：処理水槽、１１：グラニュール堆積槽、１２，１２−１，１２−２：処理水流出経路（流出管）、１３：バイオガス排出経路、１４：メタン発酵槽、１５：スカム、１６，１６−１，１６−２：バルブ、１７：迂流板、１８：溢流板   1, 1-1, 1-2: treated water (waste water) inflow path (inflow pipe), 2-9: fermenter, 10, 10-1, 10-2: treated water tank, 11: granule deposition tank, 12, 12-1, 12-2: treated water outflow path (outflow pipe), 13: biogas discharge path, 14: methane fermentation tank, 15: scum, 16, 16-1, 16-2: valve, 17: Detour plate, 18: Overflow plate

Claims (7)

溢流板と、下部が槽の底板との間に空隙を有し上部が水面上にある迂流板とを交互に配置して、被処理水を流入口から流下方向に上下に迂流を形成しながら発酵処理して、処理水を流出口から排出する横型多段メタン発酵槽を用いるメタン発酵方法において、間欠的に該流出口を閉めることにより、前記メタン発酵槽内液の水位を前記迂流板の頂部よりも上昇せしめたのち、該流出口を開けて発酵槽内上部のスカムを排出することを特徴とするメタン発酵方法。   By alternately arranging the overflow plate and the bypass plate with the gap between the bottom plate and the bottom plate of the tank and the upper part on the water surface, the treated water is diverted up and down from the inlet to the down flow direction. In a methane fermentation method using a horizontal multi-stage methane fermentation tank that is fermented while forming and discharges treated water from the outlet, the water level of the liquid in the methane fermentation tank is reduced by intermittently closing the outlet. A methane fermentation method, wherein the scum in the upper part of the fermenter is discharged by opening the outlet after raising the top of the flow plate. 前記流入口と流出口を、前記メタン発酵槽の両端部にそれぞれ配備し、該両端部の流入口から交互に被処理水を注入し、対向端の流出口から交互に処理水を排出することを特徴とする請求項１記載のメタン発酵方法。   The inlet and the outlet are respectively provided at both ends of the methane fermentation tank, the water to be treated is alternately injected from the inlets at the both ends, and the treated water is discharged from the outlet at the opposite end alternately. The methane fermentation method according to claim 1. 前記処理水流出口を有する端部には、溢流板を介して処理水槽を有し、該処理水槽には、前記被処理水流入口よりも低位置に処理水流出口を有することを特徴とする請求項１又は２記載のメタン発酵方法。   An end having the treated water outlet has a treated water tank through an overflow plate, and the treated water tank has a treated water outlet at a position lower than the treated water inlet. Item 3. The methane fermentation method according to Item 1 or 2. 溢流板と、下部が槽の底板との間に空隙を有し上部が水面上にある迂流板とを交互に配備し、槽の両端部に被処理水流入口と処理水流出口とを有する横型多段メタン発酵槽において、前記処理水流出口を、開閉可能に配備し、該発酵槽内上部のスカムを排出するために間欠的に該流出口を開閉する手段を設けたことを特徴とするメタン発酵装置。   An overflow plate and a bypass plate with a gap between the bottom plate and the bottom plate of the tank and the upper part on the water surface are alternately arranged, and a treated water inlet and a treated water outlet are provided at both ends of the tank. In a horizontal multi-stage methane fermentation tank, the treated water outlet is arranged to be openable and closable, and means for intermittently opening and closing the outlet is provided in order to discharge the scum in the upper part of the fermentation tank. Fermenter. 前記流入口と流出口とを、前記メタン発酵槽の両端部にそれぞれ配備し、該両端部の流入口から交互に被処理水を注入し、対向端の流出口から交互に処理水を排出する手段を設けたことを特徴とする請求項４記載のメタン発酵装置。   The inlet and outlet are respectively arranged at both ends of the methane fermenter, the water to be treated is alternately injected from the inlets of the both ends, and the treated water is discharged alternately from the outlet at the opposite end. 5. A methane fermentation apparatus according to claim 4, further comprising means. 前記処理水流出口を有する端部には、溢流板を介して処理水槽を設け、該処理水槽には、前記被処理水流入口よりも低位置に処理水流出口が配備されていることを特徴とする請求項４又は５記載のメタン発酵装置。   The end having the treated water outlet is provided with a treated water tank through an overflow plate, and the treated water outlet is disposed at a position lower than the treated water inlet. The methane fermentation apparatus according to claim 4 or 5. 前記処理水槽には、排出するスカムを破壊する撹拌手段を設けることを特徴とする請求項６記載のメタン発酵装置。   The methane fermentation apparatus according to claim 6, wherein the treated water tank is provided with stirring means for destroying discharged scum.
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