JP6000881B2 - Anaerobic treatment system and anaerobic treatment method - Google Patents

Anaerobic treatment system and anaerobic treatment method Download PDF

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JP6000881B2
JP6000881B2 JP2013056622A JP2013056622A JP6000881B2 JP 6000881 B2 JP6000881 B2 JP 6000881B2 JP 2013056622 A JP2013056622 A JP 2013056622A JP 2013056622 A JP2013056622 A JP 2013056622A JP 6000881 B2 JP6000881 B2 JP 6000881B2
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三雄 竹原
三雄 竹原
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Sumitomo Heavy Industries Environment Co Ltd
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Description

本発明は、嫌気性処理システム及び嫌気性処理方法に関する。   The present invention relates to an anaerobic processing system and an anaerobic processing method.

従来、有機成分が含まれる有機性排水を嫌気的に処理して処理水を得る嫌気性処理装置として、例えば下記特許文献１に記載の嫌気性処理装置が知られている。この嫌気性処理装置は、有機性排水を前処理槽に導入して前処理を行った後、メタン発酵槽においてメタン発酵処理を行うことで有機物を分解し、有機物濃度を低下させた処理水を得ている。   Conventionally, for example, an anaerobic treatment apparatus described in Patent Document 1 below is known as an anaerobic treatment apparatus that obtains treated water by anaerobically treating organic wastewater containing organic components. This anaerobic treatment device introduces organic wastewater into the pretreatment tank and performs pretreatment, then decomposes organic matter by performing methane fermentation treatment in the methane fermentation tank, and treats the treated water with reduced organic matter concentration. It has gained.

特開平７−３２８３８７号公報JP 7-328387 A

しかしながら、このような嫌気性処理装置において銅（Ｃｕ）を含有する有機性排水の処理を行おうとすると、銅イオンが生物阻害性を有するために嫌気性菌の処理性能が低下し、処理水水質に影響する可能性がある。   However, when processing an organic wastewater containing copper (Cu) in such an anaerobic treatment apparatus, the treatment performance of anaerobic bacteria decreases because copper ions have bioinhibition properties, and the quality of treated water May be affected.

本発明は上記を鑑みてなされたものであり、銅を含有する有機性排水を好適に嫌気性処理することが可能な嫌気性処理システム及び嫌気性処理方法を提供することを目的とする。   This invention is made | formed in view of the above, and it aims at providing the anaerobic processing system and the anaerobic processing method which can perform the anaerobic process suitably for the organic waste_water | drain containing copper.

上記目的を達成するため、本発明に係る嫌気性処理システムは、銅を含有する有機性排水を導入し嫌気性処理する嫌気性処理槽と、前記嫌気性処理槽よりも前段で、硫黄化合物を前記有機性排水に対して添加する硫黄化合物添加手段と、を備えることを特徴とする。   In order to achieve the above object, an anaerobic treatment system according to the present invention includes an anaerobic treatment tank that introduces an organic waste water containing copper and anaerobically treats, and a sulfur compound in a stage preceding the anaerobic treatment tank. And a sulfur compound addition means for adding to the organic waste water.

また、本発明に係る嫌気性処理方法は、銅を含有する有機性排水を嫌気性処理槽に導入し嫌気性処理する嫌気性処理工程と、前記嫌気性処理槽よりも前段で、硫黄化合物を前記有機性排水に対して添加する硫黄化合物添加工程と、を備えることを特徴とする。   In addition, the anaerobic treatment method according to the present invention includes an anaerobic treatment step of introducing an organic waste water containing copper into an anaerobic treatment tank and anaerobically treating the sulfur compound in a stage preceding the anaerobic treatment tank. And a sulfur compound addition step to be added to the organic waste water.

上記の嫌気性処理システム及び嫌気性処理方法では、嫌気性処理槽よりも前段で硫黄化合物を有機性排水に対して添加することにより、硫黄化合物の還元により生成された硫化物イオンを銅イオンと反応させて硫化銅を析出させることで、銅イオンが嫌気性処理槽に導入されることを抑制することができる。これにより、嫌気性菌の処理性能の低下を抑制し、好適に有機性排水の嫌気性処理を行うことができる。   In the anaerobic treatment system and the anaerobic treatment method described above, by adding the sulfur compound to the organic waste water before the anaerobic treatment tank, the sulfide ions generated by the reduction of the sulfur compound are converted into copper ions. By making it react and depositing copper sulfide, it can suppress that a copper ion is introduce | transduced into an anaerobic processing tank. Thereby, the fall of the processing performance of anaerobic bacteria can be suppressed and the anaerobic processing of organic wastewater can be performed suitably.

ここで、前記嫌気性処理槽の前段で前記有機性排水を前段処理する前段処理槽をさらに備え、前記硫黄化合物添加手段は、前記前段処理槽又はそれよりも前段に設けられる構成とすることができる。   Here, it is further provided with a pre-treatment tank for pre-treatment of the organic waste water in the pre-stage of the anaerobic treatment tank, and the sulfur compound addition means is configured to be provided in the pre-treatment tank or in the pre-stage thereof. it can.

嫌気性処理槽の前段に設けられる前段処理槽又はこれよりも前段で硫黄化合物を添加する構成とすることで、嫌気性処理槽に導入するまでに硫黄化合物と有機性排水とがより混合され、これにより、硫化物イオンと銅イオンとの反応が促進される。これにより、有機性排水の嫌気性処理をより好適に行うことができる。   By having a configuration in which the sulfur compound is added in the previous stage treatment tank provided in the previous stage of the anaerobic treatment tank or in the previous stage, the sulfur compound and the organic waste water are further mixed before being introduced into the anaerobic treatment tank, Thereby, reaction of sulfide ion and copper ion is promoted. Thereby, the anaerobic process of organic waste water can be performed more suitably.

また、上記態様を効果的に奏する構成として、例えば、前記前段処理槽から前記有機性排水の一部を引き抜き、前記前段処理槽へ返送する撹拌ラインをさらに備え、前記硫黄化合物添加手段は、前記撹拌ライン上に設けられる態様が挙げられる。   In addition, as a configuration that effectively exhibits the above aspect, for example, a part of the organic waste water is drawn from the preceding treatment tank and further returned to the preceding treatment tank, and the sulfur compound addition unit includes The aspect provided on a stirring line is mentioned.

このように、撹拌ライン上に硫黄化合物添加手段を設けることで、有機性排水と硫黄化合物との混合が促進され、有機性排水の嫌気性処理をより好適に行うことができる。   Thus, by providing a sulfur compound addition means on a stirring line, mixing with organic waste water and a sulfur compound is accelerated | stimulated, and the anaerobic process of organic waste water can be performed more suitably.

本発明によれば、銅を含有する有機性排水を好適に嫌気性処理することが可能な嫌気性処理システム及び嫌気性処理方法が提供される。   ADVANTAGE OF THE INVENTION According to this invention, the anaerobic processing system and the anaerobic processing method which can perform the anaerobic process suitably for the organic waste_water | drain containing copper are provided.

本発明の実施形態に係る嫌気性処理システムを示す概略構成図である。It is a schematic structure figure showing an anaerobic processing system concerning an embodiment of the present invention.

以下、添付図面を参照して、本発明を実施するための形態を詳細に説明する。なお、図面の説明においては同一要素には同一符号を付し、重複する説明を省略する。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

図１は、本発明の実施形態に係る嫌気性処理システムの構成を示す概略図である。嫌気性処理システム１は、原水流入管Ｌ１を通ってきた有機性排水を受け入れる調整槽９と、その後段の酸生成槽１１と、更にその後段の嫌気性処理槽１２と、を備える。この嫌気性処理システム１において処理される有機性排水とは、銅（Ｃｕ）を含有する有機性排水である。銅を含有する有機性排水としては、例えば、顔料等が混入した排水等が挙げられる。   FIG. 1 is a schematic diagram showing a configuration of an anaerobic processing system according to an embodiment of the present invention. The anaerobic treatment system 1 includes an adjustment tank 9 that accepts organic wastewater that has passed through the raw water inflow pipe L1, a subsequent acid generation tank 11, and a subsequent anaerobic treatment tank 12. The organic wastewater treated in the anaerobic treatment system 1 is an organic wastewater containing copper (Cu). Examples of the organic wastewater containing copper include wastewater mixed with pigments and the like.

調整槽９は、後段に送出する有機性排水の流量調整処理を行う槽である。調整槽９からは、送水管Ｌ２を通じて酸生成槽１１に所定の流量で有機性排水が送られる。   The adjustment tank 9 is a tank that performs a flow rate adjustment process of the organic wastewater to be sent to the subsequent stage. From the adjustment tank 9, organic waste water is sent to the acid production tank 11 through the water pipe L2 at a predetermined flow rate.

送水管Ｌ２には、管内へ硫黄化合物を添加する硫黄化合物添加手段５０が接続される。硫黄化合物添加手段５０によって送水管Ｌ２内の有機性排水中に添加される硫黄化合物とは、硫化物、及び、嫌気性条件下で還元されて硫化物イオン（Ｓ２−）を生成する化合物のことをいう。このような硫黄化合物としては、例えば硫酸（Ｈ２ＳＯ４）、硫化ナトリウム（Ｎａ２Ｓ）、硫化カリウム（Ｋ２Ｓ）、硫酸カルシウム（ＣａＳＯ４）、硫酸マグネシウム（ＭｇＳＯ４）等が挙げられる。 A sulfur compound addition means 50 for adding a sulfur compound into the pipe is connected to the water supply pipe L2. The sulfur compound added to the organic waste water in the water pipe L2 by the sulfur compound addition means 50 is a sulfide and a compound that is reduced under anaerobic conditions to generate a sulfide ion (S 2− ). That means. Examples of such sulfur compounds include sulfuric acid (H 2 SO 4 ), sodium sulfide (Na 2 S), potassium sulfide (K 2 S), calcium sulfate (CaSO 4 ), magnesium sulfate (MgSO 4 ), and the like. .

酸生成槽（前段処理槽）１１は、酸生成菌により有機性排水に含まれる有機物を酢酸等に分解する。また、酸生成槽１１において、中和剤としてアルカリ剤（例えば、水酸化ナトリウム）又は酸剤（例えば、塩酸）を添加することも好ましい。酸生成槽１１には、送水管Ｌ３が接続されており、ポンプＰ３の駆動により、酸生成槽１１内の有機性排水が上向流式の嫌気性処理槽１２に流入するようになっている。   The acid generation tank (pre-treatment tank) 11 decomposes organic substances contained in the organic waste water into acetic acid and the like by acid generating bacteria. Moreover, it is also preferable to add an alkali agent (for example, sodium hydroxide) or an acid agent (for example, hydrochloric acid) as a neutralizing agent in the acid production tank 11. A water supply pipe L3 is connected to the acid generation tank 11, and the organic waste water in the acid generation tank 11 flows into the upward flow type anaerobic treatment tank 12 by driving the pump P3. .

送水管Ｌ３には、酸生成槽１１からの有機性排水の一部を酸生成槽１１へ返送することで、酸生成槽１１内の有機性排水を撹拌する撹拌ラインＬ１１が設けられている。撹拌ラインＬ１１を用いて有機性排水を返送することで、送水管Ｌ２において硫黄化合物が添加された後の有機性排水が混合される。   The water supply pipe L <b> 3 is provided with a stirring line L <b> 11 for stirring the organic waste water in the acid generation tank 11 by returning a part of the organic waste water from the acid generation tank 11 to the acid generation tank 11. By returning the organic wastewater using the stirring line L11, the organic wastewater after the sulfur compound is added in the water supply pipe L2 is mixed.

嫌気性処理槽１２は、ＵＡＳＢ（Upflow Anaerobic Sludge Blanket）、又は、ＥＧＳＢ（Expanded Granular Sludge Bed）反応槽などと呼ばれるタイプの水処理槽である。嫌気性処理槽１２の下部には、流入部１３が設けられている。流入部１３は、送水管Ｌ３に連絡しており有機性排水Ｗを嫌気性処理槽１２内に流入させる。流入部１３は、例えば、長手方向に均一に穴部が設けられた送水管である。嫌気性処理槽１２内には、嫌気性汚泥が粒状化してなるグラニュール汚泥が収納されている。有機性排水Ｗは、グラニュール汚泥に接触することにより、グラニュール汚泥中の嫌気性菌によって嫌気性処理される。このようなグラニュール汚泥が、有機性排水中で下部に沈降して溜まることにより、嫌気性処理槽１２の下部にはグラニュール汚泥層１４が形成されている。   The anaerobic treatment tank 12 is a type of water treatment tank called UASB (Upflow Anaerobic Sludge Blanket) or EGSB (Expanded Granular Sludge Bed) reaction tank. An inflow portion 13 is provided at the lower portion of the anaerobic treatment tank 12. The inflow portion 13 communicates with the water supply pipe L3 and causes the organic waste water W to flow into the anaerobic treatment tank 12. The inflow portion 13 is, for example, a water pipe that is provided with holes uniformly in the longitudinal direction. In the anaerobic treatment tank 12, granular sludge formed by granulating anaerobic sludge is stored. The organic waste water W is anaerobically treated by anaerobic bacteria in the granule sludge by contacting the granule sludge. As such granular sludge settles and accumulates in the lower part in the organic waste water, a granular sludge layer 14 is formed in the lower part of the anaerobic treatment tank 12.

嫌気性処理槽１２では、その下部に設けられた流入部１３から有機性排水Ｗを内部に導入することによって上向きの流動を生じさせ、嫌気性微生物が凝集しているグラニュール汚泥層１４に有機性排水Ｗを通して、有機性排水Ｗを嫌気性処理する。グラニュール汚泥層１４の上部には、当該グラニュール汚泥層１４を通過し嫌気性処理を経た有機性排水Ｗの液層が形成されている。   In the anaerobic treatment tank 12, the organic waste water W is introduced into the inside from the inflow portion 13 provided in the lower portion thereof to cause upward flow, and the granule sludge layer 14 in which the anaerobic microorganisms are aggregated is organic. The organic waste water W is subjected to anaerobic treatment through the effluent waste water W. On the upper part of the granular sludge layer 14, a liquid layer of the organic waste water W that has passed through the granular sludge layer 14 and has undergone anaerobic treatment is formed.

また、嫌気性処理槽１２の上部には、有機性排水Ｗとグラニュール汚泥とバイオガスとを分離するための三相分離部１８が、配置されている。   Moreover, the three-phase separation part 18 for isolate | separating the organic waste water W, granule sludge, and biogas is arrange | positioned at the upper part of the anaerobic processing tank 12. FIG.

三相分離部１８の下端部には、有機性排水Ｗを三相分離部１８の内部に導入する導入口１８ａが形成されている。この導入口１８ａに有機性排水Ｗを導くために、三相分離部１８の下方であって導入口１８ａの周囲には、三相分離部１８の底部に沿って設置された導入板１９が設けられている。また、導入板１９には、導入口１８ａに導入されなかった有機性排水Ｗを下側に返送するための返送口１９ａが形成されている。また、導入板１９の更に下方には、導入板１９の返送口１９ａを通って返送される有機性排水Ｗの流れを整えるための整流板２０が設けられている。   At the lower end of the three-phase separation unit 18, an introduction port 18 a for introducing the organic waste water W into the three-phase separation unit 18 is formed. In order to guide the organic waste water W to the introduction port 18a, an introduction plate 19 installed along the bottom of the three-phase separation unit 18 is provided below the three-phase separation unit 18 and around the introduction port 18a. It has been. The introduction plate 19 is formed with a return port 19a for returning the organic waste water W that has not been introduced into the introduction port 18a downward. Further, a rectifying plate 20 for adjusting the flow of the organic waste water W returned through the return port 19 a of the introduction plate 19 is provided further below the introduction plate 19.

有機性排水Ｗは、上記グラニュール汚泥層１４を通過し上向きに流動し、導入板１９によって導入板１９と三相分離部１８との間に形成された導入路に外側から流入する。上記導入路を通った有機性排水Ｗの一部は、導入口１８ａから三相分離部１８内に流入し、他の部分は、導入板１９の返送口１９ａから下側に流れるようになっている。   The organic waste water W flows upward through the granular sludge layer 14 and flows into the introduction path formed between the introduction plate 19 and the three-phase separation portion 18 by the introduction plate 19 from the outside. Part of the organic waste water W that has passed through the introduction path flows into the three-phase separation part 18 from the introduction port 18a, and the other part flows downward from the return port 19a of the introduction plate 19. Yes.

三相分離部１８内に流入した有機性排水Ｗは、三相分離部１８の側壁１８ｂから外側に溢れ、処理水として処理水排出部２３に集められる。側壁１８ｂの上端の高さに、有機性排水Ｗの液面Ｈが形成される。処理水排出部２３の処理水の一部は、処理水返送路Ｌ４を通じて酸生成槽１１に返送され、処理水排出部２３の処理水の残部は、排水管Ｌ５を通じて系外に排出される。三相分離部１８において、三相分離部１８の側壁１８ｂの内側には、導入口１８ａから流入した有機性排水Ｗが直接処理水排出部２３に流入しないようにするための隔壁２４が設けられている。   The organic waste water W that has flowed into the three-phase separation unit 18 overflows from the side wall 18b of the three-phase separation unit 18 and is collected in the treated water discharge unit 23 as treated water. The liquid level H of the organic waste water W is formed at the height of the upper end of the side wall 18b. Part of the treated water in the treated water discharge unit 23 is returned to the acid generation tank 11 through the treated water return path L4, and the remaining treated water in the treated water discharge unit 23 is discharged out of the system through the drain pipe L5. In the three-phase separation unit 18, a partition wall 24 is provided on the inner side of the side wall 18 b of the three-phase separation unit 18 so that the organic waste water W flowing from the inlet 18 a does not directly flow into the treated water discharge unit 23. ing.

また、嫌気性処理槽１２内で、液面Ｈよりも上方の閉鎖空間３１には、前述のバイオガスが貯留される。液面Ｈ下の嫌気性処理空間３３には、有機性排水Ｗが貯留される。   In the anaerobic treatment tank 12, the aforementioned biogas is stored in the closed space 31 above the liquid level H. Organic waste water W is stored in the anaerobic treatment space 33 below the liquid surface H.

嫌気性処理槽１２では、嫌気性処理空間３３で有機性排水Ｗの嫌気性処理が行われ、バイオガスが発生する。当該バイオガスが浮上し液面Ｈまで到達することで、ガス貯留空間３１にバイオガスが一時的に貯留される。ガス貯留空間３１のバイオガスは、ガス回収ラインＬ６を通じて外部に排出され有用なエネルギー源として回収される。   In the anaerobic treatment tank 12, the anaerobic treatment of the organic waste water W is performed in the anaerobic treatment space 33, and biogas is generated. When the biogas rises and reaches the liquid level H, the biogas is temporarily stored in the gas storage space 31. The biogas in the gas storage space 31 is discharged to the outside through the gas recovery line L6 and recovered as a useful energy source.

続いて、上記嫌気性処理システム１による嫌気性処理方法について説明する。   Then, the anaerobic processing method by the said anaerobic processing system 1 is demonstrated.

（酸生成槽処理工程・硫黄化合物添加工程）
調整槽９で調整された流量で、酸生成槽１１に対し有機性廃水が導入される。このとき、調整槽９から酸生成槽１１への送液ラインＬ２において、硫黄化合物添加手段５０により硫黄化合物が添加される。添加される硫黄化合物は嫌気条件である酸生成槽１１内で還元されて硫化物イオン（Ｓ２−）を生成する。そして、この硫化物イオンは、有機性排水に含まれる銅イオン（Ｃｕ２＋）との間で以下の化学式（１）に示す反応を起こす。
Ｃｕ２＋＋Ｓ２−→ＣｕＳ↓ （１）
この結果、硫化銅（ＣｕＳ）が有機性排水中に析出する。なお、硫化物イオンを生成する硫黄化合物の添加量は、有機性排水中に含まれる銅の含有量に応じて適宜設定される。 (Acid generation tank treatment process / sulfur compound addition process)
Organic wastewater is introduced into the acid generation tank 11 at a flow rate adjusted in the adjustment tank 9. At this time, in the liquid feed line L <b> 2 from the adjustment tank 9 to the acid generation tank 11, the sulfur compound is added by the sulfur compound addition means 50. The added sulfur compound is reduced in the acid generation tank 11 under anaerobic conditions to generate sulfide ions (S 2− ). And this sulfide ion raise | generates reaction shown to the following Chemical formula (1) between the copper ion (Cu <2+> ) contained in organic waste water.
Cu 2+ + S 2− → CuS ↓ (1)
As a result, copper sulfide (CuS) is precipitated in the organic waste water. In addition, the addition amount of the sulfur compound which produces | generates a sulfide ion is suitably set according to content of copper contained in organic waste water.

酸生成槽１１では、酸生成菌により有機性廃水に含まれる有機物が酢酸等に分解される。また、酸生成槽１１に対して接続する撹拌ラインＬ１１により酸生成槽１１からの有機性排水を酸生成槽１１に返送することによって上記の反応が促進される。   In the acid production tank 11, the organic matter contained in the organic waste water is decomposed into acetic acid and the like by the acid producing bacteria. Moreover, said reaction is accelerated | stimulated by returning the organic waste_water | drain from the acid production tank 11 to the acid production tank 11 by the stirring line L11 connected with respect to the acid production tank 11. FIG.

上記酸生成処理工程及び硫黄化合物添加工程を経ることで、酢酸等の有機酸を多く含み、且つ、硫化銅が混合された有機性廃水が、酸生成槽１１から嫌気性処理槽１２に送られる。   By passing through the acid generation treatment step and the sulfur compound addition step, organic waste water containing a large amount of organic acid such as acetic acid and mixed with copper sulfide is sent from the acid generation tank 11 to the anaerobic treatment tank 12. .

（嫌気性処理工程）
嫌気性処理槽１２の流入部１３から導入された有機性廃水Ｗは、嫌気性処理空間３３内を上向きに流動する。このとき、有機性廃水Ｗは、グラニュール汚泥層１４を通過しながらグラニュール汚泥に接触し、嫌気性処理される。 (Anaerobic treatment process)
The organic waste water W introduced from the inflow portion 13 of the anaerobic treatment tank 12 flows upward in the anaerobic treatment space 33. At this time, the organic waste water W contacts the granule sludge while passing through the granule sludge layer 14 and is anaerobically treated.

（処理水排出工程）
その後、液面Ｈまで到達した有機性排水Ｗは、側壁１８ｂの上端を越えて処理水排出部２３に溢れ、処理水として排水管Ｌ５を通じて系外に排出される。なお、排出された処理水には、後段で更なる所定の水処理が施される。 (Processed water discharge process)
Thereafter, the organic waste water W that has reached the liquid level H overflows the treated water discharge part 23 beyond the upper end of the side wall 18b, and is discharged out of the system through the drain pipe L5 as treated water. The discharged treated water is subjected to further predetermined water treatment at a later stage.

（ガス回収工程）
上記嫌気性処理工程では、嫌気性反応によるバイオガス（メタンガス、二酸化炭素等）が発生し、液面Ｈまで浮上することでガス貯留空間３１に一時的に貯留され、バイオガスの量が増加すると、ガス貯留空間３１のバイオガスが、ガス貯留空間３１の圧力によってガス回収ラインＬ６を流動し排出される。 (Gas recovery process)
In the anaerobic treatment step, biogas (methane gas, carbon dioxide, etc.) due to anaerobic reaction is generated, and is temporarily stored in the gas storage space 31 by rising to the liquid level H, and the amount of biogas increases. The biogas in the gas storage space 31 flows through the gas recovery line L6 due to the pressure in the gas storage space 31 and is discharged.

続いて、以上説明した嫌気性処理システム１及び嫌気性処理方法による作用効果について説明する。   Then, the effect by the anaerobic processing system 1 and the anaerobic processing method demonstrated above is demonstrated.

嫌気性処理槽１２における嫌気性処理は、還元状態において進行するメタン生成菌等の嫌気性菌による生物反応である。しかしながら、銅を含有する有機性排水の場合、銅イオン（Ｃｕ２＋）は生物阻害性があることから、銅を含有する有機性排水を嫌気性処理槽１２に導入すると、嫌気性処理槽１２内の嫌気性菌の活動が阻害される可能性がある。この場合、嫌気性菌の活動が減り、嫌気性処理槽１２における嫌気性処理の性能が低下することが考えられる。 The anaerobic treatment in the anaerobic treatment tank 12 is a biological reaction caused by anaerobic bacteria such as methanogens that proceed in a reduced state. However, in the case of organic wastewater containing copper, copper ions (Cu 2+ ) are bioinhibiting , so when introducing organic wastewater containing copper into the anaerobic treatment tank 12, the inside of the anaerobic treatment tank 12 The activity of anaerobic bacteria may be inhibited. In this case, it is conceivable that the activity of the anaerobic bacteria is reduced and the performance of the anaerobic treatment in the anaerobic treatment tank 12 is lowered.

これに対して、本実施形態に係る嫌気性処理システム１では、送水管Ｌ２に設けられた硫黄化合物添加手段Ｌ５０によって硫黄化合物を有機性排水に対して添加することにより、硫化物又は硫黄化合物の還元により生成された硫化物イオン（Ｓ２−）を銅イオンと反応させて硫化銅を析出されることで、銅イオンが嫌気性処理槽１２に導入されることを抑制することができる。これにより、嫌気性菌の処理性能の低下を抑制し、好適に有機性排水の嫌気性処理を行うことができる。 On the other hand, in the anaerobic treatment system 1 according to the present embodiment, the sulfur compound is added to the organic waste water by the sulfur compound addition means L50 provided in the water pipe L2, so that the sulfide or the sulfur compound is added. It is possible to suppress the introduction of copper ions into the anaerobic treatment tank 12 by reacting the sulfide ions (S 2− ) generated by the reduction with copper ions to precipitate copper sulfide. Thereby, the fall of the processing performance of anaerobic bacteria can be suppressed and the anaerobic processing of organic wastewater can be performed suitably.

また、本実施形態に係る嫌気性処理システム１では、前段処理槽である酸生成槽１１よりも前段である送水管Ｌ２上に硫黄化合物添加手段５０が設けられる。このように、硫黄化合物添加手段５０を酸生成槽１１よりも前段において硫化物又は硫黄化合物を添加することによって、硫化銅として固定されることで銅イオン量を減らすことができ、嫌気性処理槽１２内の嫌気性菌の活動が銅イオンにより阻害されることを回避することができる。   Moreover, in the anaerobic processing system 1 which concerns on this embodiment, the sulfur compound addition means 50 is provided on the water supply pipe L2 which is a front | former stage rather than the acid production tank 11 which is a front | former stage processing tank. Thus, the sulfur compound addition means 50 can be reduced as copper sulfide by adding a sulfide or a sulfur compound before the acid generation tank 11, thereby reducing the amount of copper ions, and an anaerobic treatment tank. It can avoid that the activity of the anaerobic bacteria in 12 is inhibited by copper ions.

さらに、本実施形態に係る嫌気性処理システム１では、撹拌ラインＬ１１により酸生成槽１１からの有機性排水を撹拌する際に、硫黄化合物と有機性排水とを混合することもでき、銅イオンと硫化物イオンとの反応をより好適に進めることができ、嫌気性菌の処理性能の低下をさらに抑制することができる。   Furthermore, in the anaerobic treatment system 1 according to the present embodiment, when the organic waste water from the acid generation tank 11 is stirred by the stirring line L11, the sulfur compound and the organic waste water can be mixed, and copper ions and Reaction with sulfide ion can be advanced more suitably, and the fall of the processing performance of anaerobic bacteria can further be suppressed.

以上、本発明の実施形態について説明したが、本発明は、上記実施形態に限られるものではなく、各請求項に記載した要旨を変更しない範囲で変形したものであってもよい。例えば、上記実施形態では、グラニュール汚泥が用いられるＵＡＳＢ法、ＥＧＳＢ法の嫌気性処理システムについて説明したが、その他の嫌気性処理方法においても本発明に係る構成は適用することができる。   As mentioned above, although embodiment of this invention was described, this invention is not restricted to the said embodiment, You may change in the range which does not change the summary described in each claim. For example, in the above embodiment, the UASB method and EGSB method anaerobic treatment systems using granular sludge have been described. However, the configuration according to the present invention can be applied to other anaerobic treatment methods.

また、硫黄化合物添加手段５０が設けられる位置は送水管Ｌ２には限定されず、少なくとも嫌気性処理槽１２の前段に設けられていればよい。例えば、撹拌ラインＬ１１上に硫黄化合物添加手段５０を設ける構成とすることもできる。この場合、嫌気性環境にある有機性排水に対して硫黄化合物が添加されることから、硫化物イオンの生成が促進されて銅イオンとの反応が進みやすくなることも考えられる。   Moreover, the position where the sulfur compound addition means 50 is provided is not limited to the water supply pipe L2, and it is sufficient that the sulfur compound addition means 50 is provided at least in the front stage of the anaerobic treatment tank 12. For example, the sulfur compound addition means 50 can be provided on the stirring line L11. In this case, since the sulfur compound is added to the organic wastewater in the anaerobic environment, it is considered that the generation of sulfide ions is promoted and the reaction with the copper ions easily proceeds.

また、撹拌ラインＬ１１は必須の構成ではなく、例えば撹拌ラインＬ１１に代えて酸生成槽１１内を撹拌する撹拌手段を備える構成としてもよい。   Further, the stirring line L11 is not an essential configuration, and for example, it may be configured to include stirring means for stirring the inside of the acid generation tank 11 instead of the stirring line L11.

１…嫌気性処理システム、９…調整槽、１１…酸生成槽、１２…嫌気性処理槽、５０…硫黄化合物添加手段。
DESCRIPTION OF SYMBOLS 1 ... Anaerobic processing system, 9 ... Adjustment tank, 11 ... Acid production tank, 12 ... Anaerobic processing tank, 50 ... Sulfur compound addition means.

Claims (4)

銅を含有する有機性排水を導入し嫌気性処理する嫌気性処理槽と、
前記嫌気性処理槽よりも前段で、硫黄化合物を前記有機性排水に対して添加し、銅イオンを硫化銅として析出させる硫黄化合物添加手段と、
を備え、
前記嫌気性処理槽は、前記硫化銅を含んだ前記有機性排水の嫌気性処理を行う嫌気性処理システム。 An anaerobic treatment tank that introduces an organic wastewater containing copper and anaerobically treats;
A sulfur compound addition means for adding a sulfur compound to the organic waste water before the anaerobic treatment tank and precipitating copper ions as copper sulfide ,
Equipped with a,
The anaerobic treatment tank is an anaerobic treatment system that performs anaerobic treatment of the organic waste water containing the copper sulfide . 前記嫌気性処理槽の前段で前記有機性排水を前段処理する前段処理槽をさらに備え、
前記硫黄化合物添加手段は、前記前段処理槽又はそれよりも前段に設けられる請求項１記載の嫌気性処理システム。 A pre-treatment tank for pre-treatment of the organic waste water in the pre-stage of the anaerobic treatment tank;
The anaerobic treatment system according to claim 1, wherein the sulfur compound addition means is provided in the front-stage treatment tank or in a front stage. 前記前段処理槽から前記有機性排水の一部を引き抜き、前記前段処理槽へ返送する撹拌ラインをさらに備え、
前記硫黄化合物添加手段は、前記撹拌ライン上に設けられる請求項２記載の嫌気性処理システム。 It further comprises a stirring line that pulls out a part of the organic waste water from the pre-treatment tank and returns it to the pre-treatment tank,
The anaerobic treatment system according to claim 2, wherein the sulfur compound addition means is provided on the stirring line. 銅を含有する有機性排水を嫌気性処理槽に導入し嫌気性処理する嫌気性処理工程と、
前記嫌気性処理槽よりも前段で、硫黄化合物を前記有機性排水に対して添加し、銅イオンを硫化銅として析出させる硫黄化合物添加工程と、
を備え、
前記嫌気性処理工程において、前記嫌気性処理槽は、前記硫化銅を含んだ前記有機性排水の嫌気性処理を行う嫌気性処理方法。 An anaerobic treatment step of introducing an organic wastewater containing copper into the anaerobic treatment tank and anaerobically treating the wastewater;
A sulfur compound addition step in which a sulfur compound is added to the organic waste water before the anaerobic treatment tank , and copper ions are precipitated as copper sulfide ,
Equipped with a,
In the anaerobic treatment step, the anaerobic treatment tank is an anaerobic treatment method for performing anaerobic treatment of the organic wastewater containing the copper sulfide .
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