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JP2008029993A - Methane fermenter - Google Patents

Methane fermenter Download PDF

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JP2008029993A
JP2008029993A JP2006208703A JP2006208703A JP2008029993A JP 2008029993 A JP2008029993 A JP 2008029993A JP 2006208703 A JP2006208703 A JP 2006208703A JP 2006208703 A JP2006208703 A JP 2006208703A JP 2008029993 A JP2008029993 A JP 2008029993A
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waste water
solid
liquid separation
reactor tank
separation zone
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JP4687600B2 (en
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Yoshikazu Watabe
芳和 渡部
Kenji Sato
健治 佐藤
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IHI 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a methane fermenter which enables a stable treatment from high load operation to low load operation. <P>SOLUTION: In the methane fermenter where an upper gas-solid-liquid separation zone 16 is formed in the upper part of a reactor tank 10 accommodating granules, and a raw water inflow line 11 and a treated water line 12 are connected to the bottom and top of the reactor tank 10 respectively, a lower gas-solid-liquid separation zone 14 is formed in the middle of the reactor tank 10, and a circulation line 30 for returning waste water in the reactor tank 10 together with the granules to the bottom of the reactor tank 10 is connected to the lower gas-solid-liquid separation zone 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、廃水中の有機物をメタン発酵させて嫌気性処理するメタン発酵装置に関するものである。   The present invention relates to a methane fermentation apparatus that anaerobically treats organic matter in wastewater by methane fermentation.

ＵＡＳＢ（Ｕｐｆｌｏｗ Ａｎａｅｒｏｂｉｃ Ｓｌｕｄｇ Ｂｌａｎｋｅｔ，上向流式嫌気性汚泥ろ床）法は、嫌気性微生物であるメタン生成細菌を高密度に集積したグラニュールが収容されたリアクターに、廃水を上向流で流し、廃水中の有機物を分解処理するもので、好気性処理に比べて曝気を必要としないので、運転費が少なくてすむ利点がある。また、発生バイオガスがメタンガス主体なのでエネルギーとして利用できる。   The UASB (Upflow Anaerobic Slug Blanket) method is a method in which wastewater is allowed to flow upward into a reactor containing granule in which anaerobic microorganisms, which are densely accumulated anaerobic microorganisms, are stored. Since it decomposes organic matter in wastewater and does not require aeration compared to aerobic treatment, it has the advantage of lower operating costs. Moreover, since the generated biogas is mainly methane gas, it can be used as energy.

このＵＡＳВ法は、グラニュール層が固定床で、上部気固液分離ゾーンを備え、グラニュール層に廃水を流してリアクター内を上向流で流し、気固液分離ゾーンで発生したバイオガスを分離するものであり、グラニュールの比重が、１．０５程度であるが、負荷を上昇させると発生バイオガス量が増大し、気固液の分離・回収が不十分となり、特にバイオガスを巻き込み、見かけ比重の低くなったグラニュールが処理水側に流出するなど、処理能力に限界がある。   In this UASВ method, the granule layer has a fixed bed and is equipped with an upper gas-solid-liquid separation zone. Waste water is passed through the granule layer and the reactor is flowed upward, and the biogas generated in the gas-solid-liquid separation zone is discharged. The specific gravity of the granules is about 1.05, but when the load is increased, the amount of generated biogas increases, and the separation and recovery of gas-solid liquid becomes insufficient, especially involving biogas. The processing capacity is limited, for example, granules with a low apparent specific gravity flow out to the treated water side.

このＵＡＳＢ型の気固液分離ゾーンを改造し、気固液分離能力を高めたＥＧＳＢ（Ｅｘｐａｎｄｅｄ Ｇｒａｎｕｌａｒ Ｓｌｕｇｅ Ｂｅｄ）型リアクターや、発生したバイオガスによるエアリフトを用いてリアクタ内の廃水を内部循環させるＩＣリアクタ（Ｉｎｔｅｒｎａｌ Ｃｉｒｃｕｌａｔｉｏｎ Ｒｅａｃｔｏｒ）等があり、廃水とグラニュールの接触効率を高めて、高負荷運転ができるようにしたものが提案（特許文献１〜６）されている。   An EGSB (Expanded Granular Sludge Bed) type reactor with an improved gas-solid-liquid separation capability by modifying this UASB type gas-solid-liquid separation zone, and an IC that internally circulates wastewater in the reactor using the generated biogas air lift There have been proposed reactors (Internal Circulation Reactors) and the like, which have improved contact efficiency between waste water and granules to enable high-load operation (Patent Documents 1 to 6).

特開平０８−２５２５９６号公報Japanese Patent Application Laid-Open No. 08-252596 特開２００３−１９０９８６号公報JP 2003-190986 A 特開平０７−３２８６８７号公報JP 07-328687 A 特許第３３５８３２２号公報Japanese Patent No. 3358322 特開２０００−１１７２８５号公報JP 2000-117285 A 特表２００１−５０７６１９号公報JP-T-2001-507619

しかしながら、上述した提案では、高負荷運転に対応できるものの、低負荷から高負荷まで変動する場合、特に低負荷運転の場合にはＵＡＳＢ法より性能が劣る問題がある。   However, although the above-mentioned proposal can cope with high load operation, there is a problem that the performance is inferior to that of the UASB method when the load varies from low load to high load, particularly in the case of low load operation.

すなわち、ＥＧＳＢなどの高負荷型リアクターは、気固液分離能力を上げて、特にグラニュールの系外への流出を防止すると共にバイオガスの吸収能力を高めたために、そのバイオガス発生によってグラニュール層の流動性を高めて、且つ、排水とグラニュールとの接触効率を上げているが、発生するバイオガス量が少ない場合には、グラニュール層の流動状態が悪く、グラニュール層に短絡流が生じ、グラニュールを有効に機能させることができない、また流入するＳＳ（Suspended Solid ）がグラニュール層に堆積してしまうなどの問題がある。   In other words, high-load reactors such as EGSB have increased gas-solid-liquid separation capability, and in particular, prevented the outflow of granules out of the system and enhanced the ability to absorb biogas. Although the fluidity of the bed is increased and the contact efficiency between the drainage and the granule is increased, when the amount of generated biogas is small, the flow state of the granule bed is bad and the short circuit flow to the granule bed. As a result, the granules cannot function effectively, and the inflowing SS (Suspended Solid) accumulates in the granule layer.

一方、ＩＣリアクタにおいては、発生するバイオガス量によって装置内の内部循環量が決まり、グラニュール層で高い流動性が保たれるが、特にＣＯＤCr容積負荷１０ｋｇ／ｍ3 ／日以下というように低負荷でガス発生量が少ない場合には、流動性が悪く、他の高負荷形リアクターと同じような不具合が起こる。 On the other hand, in the IC reactor, the internal circulation amount in the apparatus is determined by the amount of biogas generated, and high fluidity is maintained in the granule layer. In particular, the COD Cr volumetric load is 10 kg / m 3 / day or less. When the gas generation amount is low at a low load, the fluidity is poor and the same problems as other high-load reactors occur.

そこで、本発明の目的は、上記課題を解決し、高負荷運転から低負荷運転まで安定した処理が可能なメタン発酵装置を提供することにある。   Then, the objective of this invention is providing the methane fermentation apparatus which can solve the said subject and can perform the stable process from high load operation to low load operation.

上記目的を達成するために請求項１の発明は、グラニュールが収容されたリアクター槽の上部に上部気固液分離ゾーンを形成し、リアクター槽の底部に原水流入ラインを接続すると共にリアクター槽の上部に処理水ラインを接続したメタン発酵装置において、中央部に下部気固液分離ゾーンを形成し、その下部気固液分離ゾーンに、リアクター槽内の廃水をグラニュールと共にリアクター槽底部に戻す循環ラインを接続したことを特徴とするメタン発酵装置である。   In order to achieve the above object, according to the first aspect of the present invention, an upper gas-solid-liquid separation zone is formed at the top of a reactor tank containing granules, a raw water inflow line is connected to the bottom of the reactor tank, and the reactor tank In a methane fermentation system with a treated water line connected to the top, a lower gas-solid-liquid separation zone is formed in the center, and the waste gas in the reactor tank is returned to the bottom of the reactor tank together with granules in the lower gas-solid-liquid separation zone. A methane fermentation apparatus characterized by connecting lines.

請求項２の発明は、循環ラインは、下部気固液分離ゾーンに設けられた廃水取り出し管と、廃水取り出し管からの廃水をリアクター槽の底部に戻す廃水戻し管と、廃水戻し管に接続された容量可変の循環ポンプとからなる請求項１記載のメタン発酵装置である。   In the invention of claim 2, the circulation line is connected to a waste water extraction pipe provided in the lower gas-solid separation zone, a waste water return pipe for returning the waste water from the waste water extraction pipe to the bottom of the reactor tank, and a waste water return pipe. The methane fermentation apparatus according to claim 1, further comprising a variable capacity circulation pump.

請求項３の発明は、廃水取り出し管は、下部気固液分離ゾーンの分離部材に詰まったグラニュールを吸引できるように設けられる請求項２記載のメタン発酵装置である。   A third aspect of the present invention is the methane fermentation apparatus according to the second aspect, wherein the waste water take-out pipe is provided so as to suck the granules clogged in the separation member of the lower gas-solid-liquid separation zone.

請求項４の発明は、廃水取り出し管は、下部気固液分離ゾーンの上部の廃水を取り込むように設けられる請求項２又は３記載のメタン発酵装置である。   Invention of Claim 4 is a methane fermentation apparatus of Claim 2 or 3 with which a waste-water extraction pipe | tube is provided so that the waste water of the upper part of a lower gas-solid-liquid separation zone may be taken in.

請求項５の発明は、廃水取り出し管には、バルブが接続される請求項４記載のメタン発酵装置である。   The invention according to claim 5 is the methane fermentation apparatus according to claim 4, wherein a valve is connected to the waste water take-out pipe.

請求項６の発明は、グラニュール層の上昇流速が設定値となるように循環ラインの循環ポンプの循環量が制御される請求項２記載のメタン発酵装置である。   The invention according to claim 6 is the methane fermentation apparatus according to claim 2, wherein the circulation amount of the circulation pump of the circulation line is controlled so that the ascending flow rate of the granule layer becomes a set value.

本発明によれば、高負荷運転から低負荷運転まで安定した運転ができるという優れた効果を発揮するものである。   According to the present invention, an excellent effect that stable operation can be performed from high load operation to low load operation is exhibited.

以下、本発明の好適な一実施の形態を添付図面に基づいて詳述する。   A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

図１において、１０はリアクター槽で、下部に原水流入ライン１１が接続され、上部に処理水ライン１２が接続される。   In FIG. 1, 10 is a reactor tank, and a raw water inflow line 11 is connected to the lower part, and a treated water line 12 is connected to the upper part.

このリアクター槽１０には、メタン生成細菌等のグラニュールが収容されたグラニュール層１３が形成され、その上部中央のリアクター槽１０には下部気固液分離ゾーン１４が形成され、上部には沈降層１５が形成されると共にその上部に上部気固液分離ゾーン１６が形成される。   In this reactor tank 10, a granule layer 13 containing granules such as methanogenic bacteria is formed. A lower gas-solid-liquid separation zone 14 is formed in the reactor tank 10 at the upper center, and a sedimentation is formed in the upper part. A layer 15 is formed, and an upper gas-solid-liquid separation zone 16 is formed thereon.

気固液分離ゾーン１４、１６は、断面Ｌ形の分離部材１７が、その頂角部が上方を向くように多数並べて設けられ、その上部に、下方の分離部材１７間を覆うように分離部材１７を並べて構成される。   In the gas-liquid separation zones 14 and 16, a large number of separation members 17 having an L-shaped cross section are arranged side by side so that the apex portions face upward, and the separation members 17 are covered so as to cover the lower separation members 17. 17 are arranged side by side.

下部気固液分離ゾーン１４上には、分離されたバイオガスを廃水と共に上昇させてリアクター槽１０の上部に設けた気固液分離槽１８まで導入するエアーリフト管１９が設けられる。また上部気固液分離ゾーン１６上にもエアーリフト管２０が設けられる。   An air lift pipe 19 is provided on the lower gas-solid-liquid separation zone 14 to raise the separated biogas together with waste water and introduce it to the gas-solid-liquid separation tank 18 provided at the upper part of the reactor tank 10. An air lift pipe 20 is also provided on the upper gas-solid liquid separation zone 16.

気固液分離槽１８には、エアーリフト管１９、２０で廃水をリフトしたバイオガスを排出するガス放出ライン２１が接続され、またバイオガスが分離された廃水をリアクター槽１０の底部に戻す下降管２２が接続される。   The gas-solid-liquid separation tank 18 is connected to a gas discharge line 21 for discharging the biogas lifted from the wastewater by the air lift pipes 19, 20, and descends to return the wastewater from which the biogas has been separated to the bottom of the reactor tank 10. A tube 22 is connected.

下部気固液分離ゾーン１４側のエアーリフト管１９は、図では直管で示したが、下部気固液分離ゾーン１４で分離されたバイオガスを極力取り込めるようにエアーリフト管１９の下端をロート状に形成するとよい。   The air lift pipe 19 on the lower gas-solid-liquid separation zone 14 side is shown as a straight pipe in the figure, but the lower end of the air lift pipe 19 is funneled so that the biogas separated in the lower gas-solid-liquid separation zone 14 can be taken in as much as possible. It is good to form in a shape.

この下部気固液分離ゾーン１４には、リアクター槽１０内の廃水をグラニュールと共にリアクター槽１０の底部に戻す循環ライン３０が接続される。   A circulation line 30 is connected to the lower gas-solid-liquid separation zone 14 to return the waste water in the reactor tank 10 together with the granules to the bottom of the reactor tank 10.

循環ライン３０は、下部気固液分離ゾーン１４に位置して設けられた廃水取り出し管２３と、下部気固液分離ゾーン１４上に位置して設けられた廃水取り出し管２４と、これら廃水取り出し管２３，２４に接続されたバルブ２５，２６と、廃水取り出し管２３，２４からの廃水をリアクター槽１０の底部に戻す廃水戻し管２７と、廃水戻し管２７に接続された容量可変の循環ポンプ２８とからなる。   The circulation line 30 includes a waste water extraction pipe 23 provided in the lower gas-solid-liquid separation zone 14, a waste water extraction pipe 24 provided in the lower gas-solid-liquid separation zone 14, and the waste water extraction pipes. Valves 25, 26 connected to 23, 24, a waste water return pipe 27 for returning waste water from the waste water take-out pipes 23, 24 to the bottom of the reactor tank 10, and a variable capacity circulation pump 28 connected to the waste water return pipe 27. It consists of.

下部気固液分離ゾーン１４上に位置して設けられた廃水取り出し管２４は、気固液分離された廃水を主に取り込むように設けられる。また、下部気固液分離ゾーン１４に位置して設けられた廃水取り出し管２３は、下部気固液分離ゾーン１４の分離部材１７に詰まったグラニュールを吸引除去するように設けられる。この廃水取り出し管２３は、図では上下の分離部材１７，１７の中間に位置する例を示しているが、各分離部材１７の直下に溜まったグラニュールを吸引できるように複数本とし、これを一本に集合するように構成してもよい。   A waste water take-out pipe 24 provided on the lower gas-solid-liquid separation zone 14 is provided so as to mainly take in the waste water subjected to gas-solid-liquid separation. A waste water take-out pipe 23 provided in the lower gas-solid-liquid separation zone 14 is provided so as to suck and remove granules clogged in the separation member 17 in the lower gas-solid-liquid separation zone 14. In the drawing, the waste water take-out pipe 23 is shown in the middle of the upper and lower separation members 17, 17. However, a plurality of the waste water take-out pipes 23 are provided so as to be able to suck the granule collected immediately below each separation member 17. You may comprise so that it may gather in one.

廃水取り出し管２３、２４のバルブ２５，２６は、その開度を調整することで、両廃水取り出し管２３、２４からの廃水量を調節でき、この結果、リアクター槽１０の底部に循環する廃水量とグラニュール量を調節できる。   The valves 25 and 26 of the waste water take-out pipes 23 and 24 can adjust the amounts of waste water from both the waste water take-out pipes 23 and 24 by adjusting their opening degrees. As a result, the amount of waste water circulating to the bottom of the reactor tank 10 And the amount of granules can be adjusted.

循環ポンプ２８は、グラニュール核を崩壊させにくいポンプ、例えばダイヤフラムポンプ、モーノポンプ、モノフレックポンプ等、特に固形物を移送するのに適しているポンプを選定する。また循環ポンプ２８の動力は、電力や圧縮空気で駆動する他に、発生したバイオガスを使用して駆動することでポンプ動力費を低減できる。   As the circulation pump 28, a pump that is particularly suitable for transferring solid materials, such as a pump that does not easily cause the granule nucleus to collapse, such as a diaphragm pump, a Mono pump, and a mono-flex pump, is selected. In addition to driving the power of the circulation pump 28 with electric power or compressed air, the pump power cost can be reduced by driving using the generated biogas.

以上において、原水流入ライン１１から原水（廃水）がリアクター槽１０内のグラニュール層１３内に導入され、上向流となってグラニュールと共に上昇し、その間に廃水中の有機物が分解処理され、下部気固液分離ゾーン１４で気固液分離され、さらに沈降層１５を上昇して、上部気固液分離ゾーン１６で気固液分離されて、処理水が処理水ライン１２より排水される。   In the above, raw water (waste water) is introduced into the granule layer 13 in the reactor tank 10 from the raw water inflow line 11 and rises with the granule in the upward flow, during which organic substances in the waste water are decomposed, Gas-solid-liquid separation is performed in the lower gas-solid-liquid separation zone 14, and the sedimentation layer 15 is further raised, gas-solid-liquid separation is performed in the upper gas-solid-liquid separation zone 16, and treated water is discharged from the treated water line 12.

また気固液分離ゾーン１４、１６で気固液分離されたバイオガスはエアーリフト管１９、２０にて廃水と共に気固液分離槽１８に流入し、液分が下降管２２にてリアクター槽１０の底部に戻される。   In addition, the biogas separated in the gas-solid-liquid separation zones 14 and 16 flows into the gas-solid-liquid separation tank 18 together with the waste water through the air lift pipes 19 and 20, and the liquid component is fed into the reactor tank 10 through the downcomer 22. Return to the bottom of the.

本発明においては、原水流入ライン１１から供給される原水は、最大８ｍ3 ／ｍ2 ／ｈ以下となる流量とし、その最大流量を超えない範囲の負荷変動で安定して運転できるようにしたものである。 In the present invention, the raw water supplied from the raw water inflow line 11 has a maximum flow rate of 8 m 3 / m 2 / h or less, and can be stably operated with a load fluctuation within a range not exceeding the maximum flow rate. It is.

すなわち、原水流入ライン１１から供給される原水の流量や有機物濃度が下がった場合、エアーリフト管１９，２０による廃水の内部循環量が少なくなり、グラニュール層１３、沈降層１５内のＬＶが下がりグラニュールと排水中の有機物の接触効率が悪くなるが、本発明においては、沈降層１５内のＬＶが８ｍ3 ／ｍ2 ／ｈ以上の流速となるように循環ポンプ２８を駆動する。 That is, when the flow rate of the raw water supplied from the raw water inflow line 11 and the organic substance concentration are reduced, the internal circulation amount of the wastewater by the air lift pipes 19 and 20 is reduced, and the LV in the granule layer 13 and the sedimentation layer 15 is lowered. Although the contact efficiency between the granules and the organic matter in the wastewater is deteriorated, in the present invention, the circulation pump 28 is driven so that the LV in the sedimentation layer 15 has a flow velocity of 8 m 3 / m 2 / h or more.

これにより、下部気固液分離ゾーン１４の廃水が、循環ライン３０、すなわち、廃水取り出し管２３，２４からバルブ２５，２６、廃水戻し管２７を介し、循環ポンプ２８によりリアクター槽１０の底部に循環され、グラニュールと排水中の有機物の接触効率が良好に維持されるため、且つ、ＳＳ（懸濁物）がグラニュール層１３に堆積してしまうことがなくなる。   As a result, the waste water in the lower gas-solid-liquid separation zone 14 is circulated to the bottom of the reactor tank 10 by the circulation pump 28 via the circulation line 30, that is, the waste water take-out pipes 23 and 24 through the valves 25 and 26 and the waste water return pipe 27. In addition, the contact efficiency between the granule and the organic matter in the waste water is maintained well, and SS (suspension) is not deposited on the granule layer 13.

循環ライン３０による循環量の設定は、バイオガス発生量が少なく、いわゆる負荷が低い場合には、グラニュール層１３の流動性が悪い場合には、高めに、グラニュール層１３の流動性が良い場合には、低めに設定する。   The circulation amount set by the circulation line 30 is set so that the flow rate of the granule layer 13 is high when the flow rate of the granule layer 13 is low when the biogas generation amount is small and the so-called load is low. If so, set it lower.

以上本発明は、高負荷運転は勿論低負荷運転でも安定した運転が可能となり、ＣＯＤCr容積負荷１０ｋｇ／ｍ3 ／日以下の低負荷運転においてもグラニュールと廃水の接触効率を下げずに運転ができると共に、グラニュール層１３へのＳＳ蓄積を低減できる。また原水の有機物濃度が低濃度の場合の装置内の滞留時間が短時間においても、循環ライン３０にて廃水を循環できるため、グラニュールと廃水の接触効率を高くすることができる。 As described above, the present invention enables stable operation even in low load operation as well as high load operation, and operation without lowering the contact efficiency of granules and waste water even in low load operation of COD Cr volumetric load of 10 kg / m 3 / day or less. As a result, SS accumulation in the granule layer 13 can be reduced. Moreover, since the wastewater can be circulated in the circulation line 30 even if the residence time in the apparatus is low when the organic matter concentration of the raw water is low, the contact efficiency of the granule and the wastewater can be increased.

上述の実施の形態では、エアーリフト管１９，２０，２２でバイオガスと共に廃水を内部循環するＩＣリアクターに適用する例で説明したが、エアーリフトによる循環を用いずに、循環ライン３０で全て廃水を循環するように構成してもよい。   In the above-described embodiment, an example is described in which the air lift pipes 19, 20, and 22 are applied to an IC reactor that internally circulates wastewater together with biogas. However, all wastewater is discharged from the circulation line 30 without using airlift circulation. May be configured to circulate.

また気固液分離ゾーン１４，１６は２段の例で説明したが、多段に構成するようにしてもよい。この場合、循環ライン３０で廃水をリアクター槽１０の底部に戻すのは、上段を除いた各気固液分離ゾーンの廃水を戻すようにしても、任意の段の気固液分離ゾーンの廃水を戻すようにしてもよい。   Moreover, although the gas-solid-liquid separation zones 14 and 16 were demonstrated in the example of 2 steps | paragraphs, you may make it comprise in multistage. In this case, the waste water in the circulation line 30 is returned to the bottom of the reactor tank 10 even if the waste water in each gas-solid-liquid separation zone except the upper stage is returned. You may make it return.

本発明の一実施の形態を示す図である。It is a figure which shows one embodiment of this invention.

符号の説明Explanation of symbols

１０ リアクター槽
１１ 原水流入ライン
１２ 処理水ライン
１４ 下部気固液分離ゾーン
１６ 上部気固液分離ゾーン
３０ 循環ライン
DESCRIPTION OF SYMBOLS 10 Reactor tank 11 Raw water inflow line 12 Treated water line 14 Lower gas-solid-liquid separation zone 16 Upper gas-solid-liquid separation zone 30 Circulation line

Claims (6)

グラニュールが収容されたリアクター槽の上部に上部気固液分離ゾーンを形成し、リアクター槽の底部に原水流入ラインを接続すると共にリアクター槽の上部に処理水ラインを接続したメタン発酵装置において、中央部に下部気固液分離ゾーンを形成し、その下部気固液分離ゾーンに、リアクター槽内の廃水をグラニュールと共にリアクター槽底部に戻す循環ラインを接続したことを特徴とするメタン発酵装置。   In the methane fermentation apparatus, an upper gas-solid-liquid separation zone is formed at the top of the reactor tank containing the granule, the raw water inflow line is connected to the bottom of the reactor tank, and the treated water line is connected to the top of the reactor tank. A methane fermentation apparatus characterized in that a lower gas-solid-liquid separation zone is formed in the section, and a circulation line for returning waste water in the reactor tank together with granules to the bottom of the reactor tank is connected to the lower gas-solid-liquid separation zone. 循環ラインは、下部気固液分離ゾーンに設けられた廃水取り出し管と、廃水取り出し管からの廃水をリアクター槽の底部に戻す廃水戻し管と、廃水戻し管に接続された容量可変の循環ポンプとからなる請求項１記載のメタン発酵装置。   The circulation line includes a waste water extraction pipe provided in the lower gas-solid separation zone, a waste water return pipe for returning waste water from the waste water extraction pipe to the bottom of the reactor tank, and a variable capacity circulation pump connected to the waste water return pipe. The methane fermentation apparatus according to claim 1, comprising: 廃水取り出し管は、下部気固液分離ゾーンの分離部材に詰まったグラニュールを吸引できるように設けられる請求項２記載のメタン発酵装置。   The methane fermentation apparatus according to claim 2, wherein the waste water take-out pipe is provided so as to be able to suck the granule clogged in the separation member of the lower gas-solid-liquid separation zone. 廃水取り出し管は、下部気固液分離ゾーンの上部の廃水を取り込むように設けられる請求項２又は３記載のメタン発酵装置。   The methane fermentation apparatus according to claim 2 or 3, wherein the waste water take-out pipe is provided so as to take in the waste water in the upper part of the lower gas-solid-liquid separation zone. 廃水取り出し管には、バルブが接続される請求項４記載のメタン発酵装置。   The methane fermentation apparatus according to claim 4, wherein a valve is connected to the waste water discharge pipe. グラニュール層の上昇流速が設定値となるように循環ラインの循環ポンプの循環量が制御される請求項２記載のメタン発酵装置。
The methane fermentation apparatus according to claim 2, wherein the circulation amount of the circulation pump of the circulation line is controlled so that the ascending flow rate of the granule layer becomes a set value.
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