JP2014100677A - Anaerobic wastewater treatment method using carrier - Google Patents

Anaerobic wastewater treatment method using carrier Download PDF

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JP2014100677A
JP2014100677A JP2012254968A JP2012254968A JP2014100677A JP 2014100677 A JP2014100677 A JP 2014100677A JP 2012254968 A JP2012254968 A JP 2012254968A JP 2012254968 A JP2012254968 A JP 2012254968A JP 2014100677 A JP2014100677 A JP 2014100677A
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carrier
granules
reaction tank
wastewater
organic
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JP6196767B2 (en
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Misa Baba
美佐 馬場
Hiroaki Fujii
弘明 藤井
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Kuraray Co Ltd
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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
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a method in which wastewater containing organic matter flows into a reaction vessel holding a carrier and treated biologically by anaerobic microorganisms that have grown onto the carrier, characterized in that the treatment is carried out efficiently by promoting the microbial growth onto the carrier or the efficiency of contact with the substrate.SOLUTION: The organic wastewater flows under a state in which the carrier and methanogen granules coexist in a reaction vessel and the carrier and the granules are fluidized by using agitators.

Description

本発明は有機性排水の処理方法に関する。詳しくは、有機物を含有する排水を、担体を保持する反応槽に通水して該担体に増殖した嫌気性微生物により生物学的に処理する排水処理方法において、運転立ち上げに際して担体への微生物の増殖を促進させることにより、装置の立ち上げに要する時間を大幅に短縮すると共に、装置の立ち上げ後においても効率的な処理を行う有機性排水の処理方法に関する。   The present invention relates to a method for treating organic waste water. Specifically, in a wastewater treatment method in which wastewater containing organic matter is passed through a reaction tank holding a carrier and biologically treated with anaerobic microorganisms grown on the carrier, the microorganisms on the carrier are put on the carrier at start-up. The present invention relates to a method for treating organic waste water that significantly shortens the time required to start up the apparatus by promoting proliferation and performs efficient treatment even after the apparatus is started up.

有機物を含有する排水（有機性排水）の処理方法として、メタンガスの回収、再利用が可能な嫌気処理法は、広く産業排水の処理方法として用いられている。なかでも沈降性良好なグラニュールを形成し、有機性排水を上向流で通水し、高負荷高速処理を行うＵＡＳＢ（Upflow Anaerobic Sludge Blanket：上向流嫌気性スラッジブランケット）法は、特に中〜高濃度排水を処理する方法として発展してきた。また、このＵＡＳＢ法を発展させたものとして、高さの高い反応槽を用いてさらに高流速で通水し、高負荷で嫌気性処理を行うＥＧＳＢ（Expanded Granule Sludge Blanket）法も実用化されている。   As a method for treating wastewater containing organic matter (organic wastewater), an anaerobic treatment method capable of collecting and reusing methane gas is widely used as a method for treating industrial wastewater. Among them, the UASB (Upflow Anaerobic Sludge Blanket) method, which forms granules with good sedimentation, passes organic wastewater in an upward flow, and performs high-load high-speed treatment, is particularly It has been developed as a method for treating high concentration wastewater. As an extension of the UASB method, the EGSB (Expanded Granule Sludge Blanket) method, which uses a high-height reaction tank to pass water at a higher flow rate and performs anaerobic treatment with a high load, has also been put to practical use. Yes.

また、固定床担体や流動床担体を使用する方法も用いられている。固定床担体は生物膜を保持する支持床を反応槽内部に固定し、その表面に生育する微生物を利用するものであり、流動床担体は比重や大きさを調整した担体を反応槽内部で流動させて、担体に生物を増殖させて処理を行なうものである。   A method using a fixed bed carrier or a fluidized bed carrier is also used. The fixed bed carrier uses a microorganism that grows on the surface of the reaction bed that holds the biofilm on the inside of the reaction vessel. The fluidized bed carrier allows a carrier with adjusted specific gravity and size to flow inside the reaction vessel. Thus, the organism is propagated on the carrier for treatment.

固定床担体、流動床担体を問わず、担体を用いる場合には、担体への微生物の増殖に時間がかかり、結果として装置の立ち上げに多大な時間を要するという大きな欠点があった。   When a carrier is used regardless of whether it is a fixed bed carrier or a fluidized bed carrier, the growth of microorganisms on the carrier takes time, and as a result, there is a great drawback that it takes a lot of time to start up the apparatus.

特許文献１には、非生物担体とグラニュール（平均粒径０．５〜３．０ｍｍ）を存在させた状態で有機性廃水の通水を開始する方法が提案されているが、積極的に撹拌する旨は記載されていない。   Patent Document 1 proposes a method for starting the flow of organic wastewater in the presence of a non-biological carrier and granules (average particle size of 0.5 to 3.0 mm). There is no mention of stirring.

特開２０１２−１１０８２１号公報JP 2012-110281 A

本発明は、有機物を含有する排水を、担体を保持する反応槽に通水して該担体に増殖した嫌気性微生物により生物学的に処理する方法において、運転立ち上げに際して担体への微生物の増殖を促進させることにより、装置の立ち上げに要する時間を大幅に短縮すると共に、装置の立ち上げ後においても効率的な処理を行うことができる有機性排水の処理方法を提供することを課題とする。   The present invention relates to a method of biologically treating wastewater containing organic matter with anaerobic microorganisms that have passed through a reaction tank holding a carrier and grown on the carrier. It is an object of the present invention to provide a method for treating organic waste water that can significantly reduce the time required for starting up the apparatus and that can perform efficient treatment even after the apparatus is started up. .

本発明者らは、鋭意検討を重ねた結果、担体を保持する反応槽の立ち上げに際して、該反応槽内で有機性排水を担体およびメタン菌グラニュールと撹拌し、効率よくメタン菌を付着増殖させる運転条件を採用することにより、上記課題を解決することができることを見出した。   As a result of intensive studies, the present inventors stir organic wastewater with a carrier and methane bacteria granules in the reaction tank when the reaction tank holding the carrier is started up, and efficiently attach and proliferate the methane bacteria. It has been found that the above-mentioned problems can be solved by adopting the operating conditions.

本発明について、以下具体的に説明する。   The present invention will be specifically described below.

［１］有機物を含有する排水を、担体を保持する反応槽に通水して該担体に増殖した嫌気性微生物により生物学的に処理する有機性排水の処理方法において、該反応槽内で該有機性排水を担体およびメタン菌グラニュールと撹拌することを特徴とする有機性排水の処理方法。 [1] An organic wastewater treatment method in which wastewater containing organic matter is passed through a reaction tank holding a carrier and biologically treated with anaerobic microorganisms grown on the carrier. A method for treating organic wastewater, comprising stirring organic wastewater with a carrier and methane bacteria granules.

［２］撹拌の方法が機械撹拌および／またはポンプ循環および／または不活性ガス曝気である、請求項１に記載の有機性排水の処理方法。 [2] The method for treating organic waste water according to claim 1, wherein the stirring method is mechanical stirring and / or pump circulation and / or inert gas aeration.

［３］メタン菌グラニュールを、担体１Ｌあたり１〜９００ｇの範囲で存在させることを特徴とする、請求項１または２に記載の有機性排水の処理方法。 [3] The method for treating organic waste water according to claim 1 or 2, wherein the methanogenic granules are present in the range of 1 to 900 g per liter of the carrier.

［４］担体がポリビニルアルコール系担体である、請求項１〜３のいずれか１項に記載の有機性排水の処理方法。 [4] The organic wastewater treatment method according to any one of claims 1 to 3, wherein the carrier is a polyvinyl alcohol carrier.

本発明によれば、有機物を含有する排水を、担体を保持する反応槽に通水して該担体に増殖した嫌気性微生物により生物学的に処理する方法において、運転立ち上げに際して担体への微生物の増殖を促進させることにより、装置の立ち上げに要する時間を大幅に短縮すると共に、装置の立ち上げ後においても効率的な処理を行うことができる。   According to the present invention, in a method of biologically treating wastewater containing organic matter through an anaerobic microorganism grown on a carrier through a reaction tank holding the carrier, the microorganisms to the carrier at the start of operation By promoting the proliferation of the apparatus, the time required for starting up the apparatus can be greatly shortened, and efficient processing can be performed even after the apparatus is started up.

メタン菌グラニュールは積極的に撹拌すると解体して系外へ流出することから、ＵＡＳＢ法のようにゆるやかな上昇流で通水するのが常識であった。   Since the methane bacteria granules are disassembled and flow out of the system when they are actively stirred, it was common knowledge to pass water in a gradual upward flow as in the UASB method.

しかし、本発明においては、有機性排水を担体およびメタン菌グラニュールと撹拌する、という常識を覆す方法により、有機性排水処理装置の立ち上げを試みた。
その結果、従来の常識のとおりグラニュールが解体して系外へ流出し能力を失うかと思われたが、驚くべきことに、担体への微生物増殖が促進され、能力を失うことなく立ち上げできることを確認した。これは撹拌によって、担体とグラニュールの接触効率が高められ、短期間で担体への微生物の増殖が促進されたためと考えられる。 However, in the present invention, an attempt was made to start up an organic wastewater treatment apparatus by a method that overturned the common sense of stirring organic wastewater with a carrier and methane bacteria granules.
As a result, it was thought that granule was dismantled and flowed out of the system as conventional common sense, and lost its ability. It was confirmed. This is considered to be because the contact efficiency between the carrier and the granules was increased by stirring, and the growth of microorganisms on the carrier was promoted in a short period of time.

以上説明したとおり、本発明によれば、装置の立ち上げに要する時間を大幅に短縮すると共に、装置の立ち上げ後においては効率的な処理を行なうことが可能となる。   As described above, according to the present invention, the time required to start up the apparatus can be greatly shortened, and efficient processing can be performed after the apparatus is started up.

実施例１で用いた生物処理装置の構成を示す系統図である。It is a systematic diagram which shows the structure of the biological treatment apparatus used in Example 1. FIG. 比較例１で用いた生物処理装置の構成を示す系統図である。It is a systematic diagram which shows the structure of the biological treatment apparatus used in the comparative example 1. 実施例１及び比較例１における処理能力の経時変化を示すグラフである。6 is a graph showing changes in processing capacity with time in Example 1 and Comparative Example 1.

以下、本発明の実施形態を詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail.

本発明の有機性排水の処理方法は、有機物を含有する排水を、担体を保持する反応槽に通水して該担体に増殖した嫌気性微生物により生物学的に処理する有機性排水の処理方法において、該反応槽内で該有機性排水を担体およびメタン菌グラニュールと撹拌することを特徴とする。   The organic wastewater treatment method of the present invention is a method for treating organic wastewater, in which wastewater containing organic matter is passed through a reaction tank holding a carrier and biologically treated by anaerobic microorganisms grown on the carrier. In the method, the organic waste water is agitated with a carrier and a methane bacterium granule in the reaction vessel.

本発明では担体を保持した反応槽内に、種汚泥としてメタン菌グラニュールを投入し、撹拌された状態で反応槽の立ち上げを行なうことを特徴としている。投入されたメタン菌グラニュールは、運転立ち上げ時において、撹拌によって担体との接触効率が高められ、短時間で担体への微生物の増殖を促進する効果を奏する。   The present invention is characterized in that methane bacteria granules are introduced as seed sludge into a reaction tank holding a carrier, and the reaction tank is started up in a stirred state. The charged methane bacteria granules are improved in contact efficiency with the carrier by agitation at the start-up of the operation, and have the effect of promoting the growth of microorganisms on the carrier in a short time.

本発明において、処理対象とする有機性排水は、嫌気性微生物により処理可能な有機物を含むものであればよく、そのＣＯＤ濃度・種類に規定はないが、具体的には、食品工場等の製造排水、化学工場等の有機性排水、一般下水等が挙げられる。しかし、何らこれらに限定されるものではない。   In the present invention, the organic wastewater to be treated is not limited as long as it contains an organic substance that can be treated by anaerobic microorganisms, and its COD concentration / type is not specified. Examples include wastewater, organic wastewater from chemical factories, and general sewage. However, it is not limited to these.

種汚泥として反応槽に投入するメタン菌グラニュールは、特に限定されるものではないが、ＵＡＳＢ法やＥＧＳＢ法で使用されているグラニュール（平均粒径０．５〜３．０ｍｍ）は嫌気処理を行なっているためメタン菌を多く含んでいるので、これらを用いるのが好ましい。   The methane bacteria granules to be introduced into the reaction tank as seed sludge are not particularly limited, but the granules (average particle size 0.5 to 3.0 mm) used in the UASB method and EGSB method are anaerobically treated. Since it contains a lot of methane bacteria, it is preferable to use these.

本発明においては、メタン菌グラニュールを、担体１Ｌあたり１〜９００ｇの範囲で存在させることが好ましく、担体１Ｌあたり１〜５００ｇの範囲で存在させることがより好ましく、担体１Ｌあたり１〜１５０ｇの範囲で存在させることがさらに好ましい。ここで、メタン菌グラニュールの量は、揮発性浮遊性物質（Volatile Suspended Solid：ＶＳＳ）の量のことである。ＶＳＳとは、有機性固形物の総量の目安となる指標をいう。担体１Ｌあたり１ｇよりもメタン菌グラニュールの投入量が少ないと本発明の効果を十分に得ることができず、担体１Ｌあたり９００ｇよりも多いと粘度が上昇し撹拌が困難となる可能性がある。また、反応槽内からのメタン菌グラニュールの流出が多く、処理水の悪化が懸念されるため好ましくない。   In the present invention, the methane bacteria granules are preferably present in the range of 1 to 900 g per liter of support, more preferably in the range of 1 to 500 g per liter of support, and in the range of 1 to 150 g per liter of support. More preferably, it is made to exist. Here, the amount of methane bacteria granules is the amount of volatile suspended solids (VSS). VSS refers to an index that is a measure of the total amount of organic solids. If the input amount of methane bacteria granules is less than 1 g per liter of carrier, the effect of the present invention cannot be obtained sufficiently, and if it exceeds 900 g per liter of carrier, the viscosity increases and stirring may become difficult. . Moreover, since there are many outflows of the methane bacteria granule from the inside of a reaction tank and there exists a concern about deterioration of treated water, it is unpreferable.

本発明では、運転立ち上げに際して、担体を保持する反応槽に有機性排水を通水して該担体に増殖した嫌気性微生物により生物学的に処理する有機性排水の処理方法において、該反応槽内で有機性排水をメタン菌グラニュール及び担体と撹拌させて嫌気性処理を行う。   In the present invention, at the time of start-up of the operation, in the organic wastewater treatment method, the organic wastewater is passed through a reaction tank holding the carrier and biologically treated by anaerobic microorganisms grown on the carrier. The organic wastewater is agitated with the methane bacteria granules and the carrier, and anaerobic treatment is performed.

その撹拌方式としては、撹拌機等で反応槽内を撹拌して流動させる方法、ポンプで担体およびメタン菌グラニュールを該反応槽内で循環させる方法、窒素・メタンガス等酸素を含有しない気体で反応槽内を曝気流動させる方法などが考えられ、担体とメタン菌グラニュールが十分に混合・接触する方法をとる必要がある。ＵＡＳＢ法、ＥＧＳＢ法で行なわれているような反応槽に原水を上向流で通水する方法では不十分である。   As a stirring method, a method of stirring and flowing in a reaction tank with a stirrer or the like, a method of circulating a carrier and a methane bacterium granule in the reaction tank with a pump, a reaction with a gas not containing oxygen such as nitrogen and methane gas. A method of aeration and flowing in the tank is conceivable, and it is necessary to take a method in which the carrier and methane bacteria granules are sufficiently mixed and contacted. A method in which raw water is passed in an upward flow into a reaction tank as in the UASB method and the EGSB method is insufficient.

使用する担体としては、特に制限は無いが微生物棲息性に優れた高分子ゲル状担体、特にポリビニルアルコール系ゲル担体が好ましい。担体の平均粒径は１〜１０ｍｍ、特に２〜６ｍｍであることが好ましい。
担体の表面から内部に連通する孔における孔径は、自由にコントロールできるが、バクテリアのみが担体内部に棲息できるものが好ましく、表面付近の孔径は０．１μｍ以上１００μｍ以下のものが好ましく、０．５μｍ以上５０μｍ以下がさらに好ましい。表面付近の孔径が０．１μｍよりも小さいとバクテリアが内部に進入できないなどの問題があり、１００μｍよりも大きいとバクテリア以外の大きな生物が侵入し効率が低下する場合がある。担体中心付近の孔径については特に制限はない。 The carrier to be used is not particularly limited, but a polymer gel carrier excellent in microbial habitability, particularly a polyvinyl alcohol gel carrier is preferable. The average particle size of the carrier is preferably 1 to 10 mm, particularly preferably 2 to 6 mm.
The pore diameter in the hole communicating from the surface to the inside of the carrier can be freely controlled, but preferably only bacteria can inhabit the inside of the carrier, and the pore diameter near the surface is preferably from 0.1 μm to 100 μm, preferably 0.5 μm More preferably, it is 50 μm or less. If the pore diameter near the surface is smaller than 0.1 μm, there is a problem that bacteria cannot enter the inside. If it is larger than 100 μm, large organisms other than bacteria may invade and the efficiency may be lowered. There is no particular limitation on the pore diameter near the center of the carrier.

担体の形状は、限定されるものではなく、立方体、直方体、円柱状、球状、マカロニ状など任意の形状をとることができる。メタン菌との接触効率を考えると球状が好ましい。   The shape of the carrier is not limited, and can be any shape such as a cube, a rectangular parallelepiped, a cylinder, a sphere, or a macaroni. Considering the contact efficiency with methane bacteria, the spherical shape is preferable.

原水の有機物濃度は特に限定されるものではなく、ＣＯＤＣｒ５００〜５００００ｍｇ／Ｌなど幅広く適用できる。反応槽に流入する際の原液のｐＨは６．５〜７．５程度であることが好ましく、従って、原水は必要に応じてｐＨ調整を行ってから反応槽に通水することが好ましい。   The organic substance density | concentration of raw | natural water is not specifically limited, CODCr500-50000mg / L etc. can apply widely. The pH of the undiluted solution when flowing into the reaction tank is preferably about 6.5 to 7.5. Therefore, it is preferable that the raw water is adjusted to the pH if necessary and then passed through the reaction tank.

反応槽の負荷も特に限定はないが、５〜５０ｋｇ−ＣＯＤＣｒ／ｍ３・日と高負荷をかけることも可能である。また、反応槽内の温度は通常のメタン発酵の条件と同様で２５〜４０℃、特に３０〜３８℃とすることが好ましい。 The load on the reaction tank is not particularly limited, but a high load of 5 to 50 kg-CODCr / m 3 · day can be applied. The temperature in the reaction tank is 25 to 40 ° C., particularly 30 to 38 ° C., as in the usual methane fermentation conditions.

以下、実施例及び比較例を挙げて本発明を詳細に説明するが、本発明は、これら実施例に限定されるものではない。   EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated in detail, this invention is not limited to these Examples.

［実施例１］
図１に示すフローに従って、食品会社Ｆの実排水による嫌気性排水処理を実施した。反応槽の仕様並びに処理条件は下記の通りとした。 [Example 1]
In accordance with the flow shown in FIG. The specifications and processing conditions of the reaction vessel were as follows.

・反応槽の仕様
反応槽：容量８Ｌ
槽内温度：３５〜３７℃
反応槽に充填する担体：アセタール化ポリビニルアルコール系ゲル状担体（直径約４ｍｍ，比重１．０２５）
反応槽担体充填量：４０容量％（槽容積に対する。）
・処理条件
原水ＣＯＤＣｒ濃度：５０００ｍｇ／Ｌ
初期投入メタン菌グラニュール量：１５ｇ−ＶＳＳ／Ｌ−担体 ・ Reaction tank specifications Reaction tank: Capacity 8L
Tank temperature: 35-37 ° C
Carrier filled in reaction tank: acetalized polyvinyl alcohol gel carrier (diameter: about 4 mm, specific gravity: 1.025)
Reaction tank carrier filling amount: 40% by volume (relative to tank volume)
・ Treatment conditions Raw water CODCr concentration: 5000 mg / L
Initial amount of methane bacteria granules: 15 g-VSS / L-carrier

図１に示す攪拌機を有した上記反応槽の仕様および処理条件にて立上げを実施した。排水流量は２．２Ｌ／日から運転開始し、その後、流量を段階的に上げ、約２週間程度で除去量（処理能力）２０ｋｇ−ＣＯＤＣｒ／ｍ３・日に到達した。なお、ＣＯＤＣｒ除去率は、常に９０％以上を推移し、非常に良好であった。 The start-up was carried out with the specifications and processing conditions of the reactor having the stirrer shown in FIG. The drainage flow rate started operation from 2.2 L / day, and then the flow rate was increased stepwise, and the removal amount (processing capacity) 20 kg-CODCr / m 3 · day was reached in about 2 weeks. Note that the CODCr removal rate always remained 90% or more, which was very good.

［比較例１］
図２に示す攪拌機を有しない上向流式フローに従い、反応槽の槽容量および処理条件を実施例１と同じとした立上げ試験を実施した。排水流量は２．２Ｌ／日から運転開始し、その後、流量を実施例1と同じように上昇させようとしたが、嫌気反応槽内有機酸濃度が管理値である５００ｍｇ／Ｌ以上となり、その際にはＣＯＤＣｒ除去率も９０％を達成できなかったため、流量UPを図ることができなかった。よって、負荷UPのタイミングが実施例１と比較し遅れたため、結果として、除去量（処理能力）２０ｋｇ−ＣＯＤＣｒ／ｍ３・日に到達するのに約１ヶ月程度の期間を要した。 [Comparative Example 1]
In accordance with the upflow flow without a stirrer shown in FIG. 2, a start-up test was conducted with the same tank capacity and treatment conditions as those in Example 1. The drainage flow rate started operation from 2.2 L / day, and then tried to increase the flow rate in the same manner as in Example 1. However, the organic acid concentration in the anaerobic reaction tank became a control value of 500 mg / L or more, and At that time, the CODCr removal rate could not be 90%, so the flow rate could not be increased. Therefore, the load UP timing was delayed as compared with Example 1, and as a result, a period of about one month was required to reach the removal amount (processing capacity) 20 kg-CODCr / m 3 · day.

図３に示す実施例１及び比較例１の結果より、嫌気性流動床処理において、反応槽に攪拌機を設置することにより、担体との接触効率が高められ、短時間で担体への微生物の増殖を促進することが確認された。   From the results of Example 1 and Comparative Example 1 shown in FIG. 3, in the anaerobic fluidized bed treatment, by installing a stirrer in the reaction tank, the contact efficiency with the carrier is increased, and the microorganisms grow on the carrier in a short time. Has been confirmed to promote.

１・・・原水
２・・・嫌気反応槽
３・・・反応ガス
４・・・処理水
５・・・攪拌機 DESCRIPTION OF SYMBOLS 1 ... Raw water 2 ... Anaerobic reaction tank 3 ... Reaction gas 4 ... Treated water 5 ... Stirrer

Claims (4)

有機物を含有する排水を、担体を保持する反応槽に通水して該担体に増殖した嫌気性微生物により生物学的に処理する有機性排水の処理方法において、該反応槽内で該有機性排水を担体およびメタン菌グラニュールと撹拌することを特徴とする有機性排水の処理方法。   An organic wastewater treatment method in which wastewater containing organic matter is passed through a reaction vessel holding a carrier and biologically treated with anaerobic microorganisms grown on the carrier. A method for treating organic wastewater, characterized in that the mixture is agitated with a carrier and methane bacteria granules. 撹拌の方法が機械撹拌および／またはポンプ循環および／または不活性ガス曝気である、請求項１に記載の有機性排水の処理方法。   The method for treating organic waste water according to claim 1, wherein the stirring method is mechanical stirring and / or pump circulation and / or inert gas aeration. メタン菌グラニュールを、担体１Ｌあたり１〜９００ｇの範囲で存在させることを特徴とする、請求項１または２に記載の有機性排水の処理方法。   The method for treating organic waste water according to claim 1 or 2, wherein the methanogenic granules are present in an amount of 1 to 900 g per liter of the carrier. 担体がポリビニルアルコール系担体である、請求項１〜３のいずれか１項に記載の有機性排水の処理方法。   The organic wastewater treatment method according to any one of claims 1 to 3, wherein the carrier is a polyvinyl alcohol carrier.
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