JP2022032305A - Water treatment installation and water treatment method - Google Patents

Water treatment installation and water treatment method Download PDF

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JP2022032305A
JP2022032305A JP2020135941A JP2020135941A JP2022032305A JP 2022032305 A JP2022032305 A JP 2022032305A JP 2020135941 A JP2020135941 A JP 2020135941A JP 2020135941 A JP2020135941 A JP 2020135941A JP 2022032305 A JP2022032305 A JP 2022032305A
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biological treatment
sludge
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liquid separation
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晃志 城野
Akishi Jono
剛 安部
Takeshi Abe
良介 宇佐見
Ryosuke Usami
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Kubota Environmental Service Co Ltd
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    • YGENERAL 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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    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract

To provide a water treatment installation capable of effectively utilizing a dominant specific microorganism group to a biological treatment.SOLUTION: A water treatment installation 10 includes: a storage tank 3 configured to store organic waste water; a biological treatment tank 4 configured to biologically treat the organic waste water sent from the storage tank; and a solid-liquid separation tank 5 configured to solid-liquid separate the organic waste water sent from the biological treatment tank. The water treatment installation further includes: a reactor 8 to which polluted sludge drawn from a solid-liquid separation layer 5 is sent and a biological treatment auxiliary agent for making a specific microorganism group included in the polluted sludge dominant is filled or charged; and a route switching mechanism 11 configured to switch whether the polluted sludge including spores of the specific microorganism made dominant in the reactor 8 is to be charged into the biological treatment tank 4 or into further upstream than the biological treatment tank 4.SELECTED DRAWING: Figure 1

Description

本発明は、有機性排水を生物処理する水処理設備及び水処理方法に関する。 The present invention relates to a water treatment facility and a water treatment method for biologically treating organic wastewater.

一般に、有機性排水を生物処理する水処理設備に搬入された汚水は、し渣の除去等の前処理が行なわれた後に、貯留槽に貯留され、貯留槽から生物処理槽に定量的に送水される。そして、生物処理された被処理水は固液分離され、活性炭ろ過等の高度処理が行なわれた後に河川等に放流される。一方、固液分離された汚泥はフィルタプレス脱水機などを用いて脱水された後に焼却などの処理が行なわれる。 In general, sewage carried into a water treatment facility that biologically treats organic wastewater is stored in a storage tank after pretreatment such as removal of residue, and is quantitatively sent from the storage tank to the biological treatment tank. Will be done. Then, the biologically treated water to be treated is solid-liquid separated, and after being subjected to advanced treatment such as activated carbon filtration, it is discharged into a river or the like. On the other hand, the solid-liquid separated sludge is dehydrated using a filter press dehydrator or the like, and then incinerated or the like.

このような有機性排水に対する従来の水処理設備では、生物処理で生じた余剰汚泥の処理コストが水処理に掛かるコストの中で大きな割合を占めていることから、コスト低減のために余剰汚泥の減容化が求められている。 In conventional water treatment equipment for such organic wastewater, the treatment cost of excess sludge generated by biological treatment accounts for a large proportion of the cost of water treatment, so the excess sludge is used to reduce the cost. Volume reduction is required.

そこで、本願発明者らは、活性汚泥法を採用する水処理装置の処理槽に生物処理助剤を供給して特定の微生物叢を汚泥中で優占化させ、特定の微生物叢を用いた生物処理によって悪臭の発生を軽減させるとともに余剰汚泥の発生量を低減させるべく鋭意研究開発を進めてきた。 Therefore, the inventors of the present application supply a biological treatment aid to the treatment tank of a water treatment apparatus adopting the activated sludge method to make a specific microbial flora predominant in the sludge, and organisms using the specific microbial flora. We have been diligently conducting research and development to reduce the generation of foul odors and the amount of excess sludge generated by treatment.

特許文献1には、少なくとも生し尿と浄化槽汚泥を含むし尿廃水を導入して脱リン剤を含む添加剤を添加混合する添加部と、該添加部で添加剤が添加混合されたし尿廃水を導入して酸化処理する前反応手段と、該前反応手段で処理された廃水を上澄み液と汚泥に重力式固液分離を行う汚泥沈降槽と、該汚泥沈降槽で分離された汚泥を脱水する脱水手段と、前記汚泥沈降槽で分離された上澄み液を導入して硝化脱窒処理する反応手段と、該反応手段から送られる懸濁液を汚泥と処理液に固液分離する固液分離手段とを有し、且つ前記反応手段内で発生する余剰汚泥を前記添加部あるいはその前工程に返送する返送手段を備えたし尿処理装置が提案されている。 In Patent Document 1, at least an additive section containing raw urine and septic tank sludge and adding and mixing an additive containing a dephosphorizing agent by introducing urine waste water, and an additive section in which the additive is added and mixed are introduced. The pre-reaction means for oxidation treatment, the sludge settling tank for gravity-type solid-liquid separation of the waste water treated by the pre-reaction means into the supernatant and sludge, and the sludge to dehydrate the sludge separated in the sludge settling tank. Means, reaction means for introducing the supernatant separated in the sludge settling tank for nitrification and denitrification treatment, and solid-liquid separation means for solid-liquid separating the suspension sent from the reaction means into sludge and the treatment liquid. A human waste treatment apparatus has been proposed, which comprises a return means for returning excess sludge generated in the reaction means to the addition section or a previous step thereof.

そして、添加剤として腐植物を主体とする土壌成形体が用いられることにより、生し尿や浄化槽汚泥等の凝集や有用細菌の優占化が図られ、生し尿中の有機物、特に高分子有機物の分解を向上させ、悪臭を発生させず、固液分離性を向上させることができる。 By using a soil molded body mainly composed of rotten plants as an additive, aggregation of raw urine, septic tank sludge, etc. and dominance of useful bacteria are achieved, and organic matter in raw urine, especially high molecular weight organic matter, is achieved. It is possible to improve decomposition, not generate a foul odor, and improve solid-liquid separability.

特許文献2には、有機性廃水である浄化槽汚泥を受け入れる浄化槽汚泥受入槽と、前記浄化槽汚泥受入槽に受け入れられた有機性廃水を脱水処理する脱水設備と、前記脱水設備で固液分離された有機性廃水を微生物によって生物処理する生物処理設備とを備えている廃水処理設備であって、前記微生物のうち特定微生物群を優占化する生物処理助剤が充填されたリアクターを前記生物処理設備に備えるとともに、前記リアクターによって特定微生物群が優占化された汚泥を前記脱水設備で脱水処理される前の有機性廃水に供給する廃水処理設備が提案されている。 Patent Document 2 describes a septic tank sludge receiving tank that receives septic tank sludge, which is organic waste water, a dehydration facility that dehydrates the organic waste water received in the septic tank sludge receiving tank, and a solid-liquid separation by the dehydration facility. A wastewater treatment facility equipped with a biological treatment facility for biologically treating organic wastewater with microorganisms, and the biological treatment facility is filled with a biological treatment aid that occupies a specific microbial group among the microorganisms. A wastewater treatment facility has been proposed in which sludge dominated by a specific microbial group by the reactor is supplied to organic wastewater before it is dehydrated by the dehydration facility.

当該廃水処理設備では、リアクターによって生物処理助剤に接触した汚泥が生物処理槽に返送されることにより、生物処理槽で通性嫌気性の土壌微生物群である特定微生物群が優占化され、当該特定微生物群によって硝化・脱窒等の生物処理が行なわれる。 In the wastewater treatment facility, sludge that has come into contact with the biological treatment aid is returned to the biological treatment tank by the reactor, so that the specific microorganism group, which is a facultative anaerobic soil microorganism group, is dominated in the biological treatment tank. Biological treatments such as nitrification and denitrification are performed by the specific microbial group.

特開平11-33591号公報Japanese Unexamined Patent Publication No. 11-33591 特開2015-188817号公報Japanese Unexamined Patent Publication No. 2015-188817

特許文献1に記載されたし尿処理装置は、腐植物を主体とする土壌成形体によって優占化が図られた有用細菌が供給された生し尿が汚泥沈降槽によって固液分離される過程で有用細菌の殆どが汚泥側に移行するため、固液分離された液分が生物処理される反応槽で有用細菌を効果的に利用するような構成ではなかった。 The human waste treatment apparatus described in Patent Document 1 is useful in a process in which raw urine supplied with useful bacteria dominated by a soil molded body mainly composed of rot plants is solid-liquid separated by a sludge settling tank. Since most of the bacteria migrate to the sludge side, the structure was such that useful bacteria were effectively used in the reaction tank where the solid-liquid separated liquid was biologically treated.

特許文献2に記載された廃水処理設備でも、リアクターによって特定微生物群が優占化された汚泥が脱水設備で脱水処理される前の有機性廃水に供給されるので、特定微生物群が脱水設備で汚泥側に分離される点で、特許文献1と変わるものではなかった。 Even in the wastewater treatment facility described in Patent Document 2, the sludge in which the specific microbial group is dominated by the reactor is supplied to the organic wastewater before the dehydration treatment in the dehydration facility, so that the specific microbial group is in the dehydration facility. It was not different from Patent Document 1 in that it was separated on the sludge side.

また、近年、廃水処理設備に搬入されるし尿は低負荷化の傾向が高まり、リアクターによって強固な芽胞が形成された特定微生物群が低負荷の生物処理槽に返送されても良好に発芽せず、生物処理に寄与できないという課題が生じている。 In recent years, human waste carried into wastewater treatment equipment tends to have a lower load, and even if specific microorganisms in which strong spores are formed by the reactor are returned to a low-load biological treatment tank, they do not germinate well. , There is a problem that it cannot contribute to biological treatment.

本発明の目的は、優占化された特定微生物群を効果的に生物処理に活用できる水処理設備及び水処理方法を提供する点にある。 An object of the present invention is to provide a water treatment facility and a water treatment method capable of effectively utilizing a dominated specific microorganism group for biological treatment.

上述の目的を達成するため、本発明による水処理設備の第一特徴構成は、有機性排水を貯留する貯留槽と、前記貯留槽から送液された有機性排水を生物処理する生物処理槽と、前記生物処理槽から送液された有機性排水を固液分離する固液分離槽と、を備えている水処理設備であって、前記固液分離槽から引き抜いた汚泥が送液され、当該汚泥に含まれる特定微生物群を優占化する生物処理助剤が充填または投入されるリアクターと、前記リアクターで優占化された特定微生物の芽胞が含まれた汚泥を、前記生物処理槽に投入するか前記生物処理槽より上流側に投入するかを切り替える経路切替機構を備えている点にある。 In order to achieve the above object, the first characteristic configuration of the water treatment facility according to the present invention is a storage tank for storing organic wastewater and a biological treatment tank for biologically treating the organic wastewater sent from the storage tank. A water treatment facility equipped with a solid-liquid separation tank for solid-liquid separation of organic wastewater sent from the biological treatment tank, and sludge drawn from the solid-liquid separation tank is sent and said. A reactor filled or charged with a biological treatment aid that occupies a specific microorganism group contained in sludge and a sludge containing spores of the specific microorganism dominated by the reactor are charged into the biological treatment tank. The point is that it is equipped with a route switching mechanism for switching whether to use the water or to put it on the upstream side of the biological treatment tank.

リアクターで優占化され芽胞が形成された特定微生物群を含む汚泥が、経路切替機構を介して生物処理槽または生物処理槽より上流側に投入される。芽胞が形成された特定微生物群の発芽が促され、効果的に生物処理が行なえるようになる。 Sludge containing a specific group of microorganisms dominated by the reactor and having spores formed is charged upstream of the biological treatment tank or the biological treatment tank via a route switching mechanism. The germination of specific microorganisms in which spores are formed is promoted, and biological treatment can be performed effectively.

同第二の特徴構成は、上述した第一の特徴構成に加えて、前記生物処理槽の窒素MLSS負荷が所定値以上である場合に、前記リアクターで優占化され特定微生物の芽胞が含まれた汚泥を前記生物処理槽に投入する点にある。 In addition to the above-mentioned first characteristic configuration, the second characteristic configuration includes spores of specific microorganisms that are dominated by the reactor when the nitrogen MLSS load of the biological treatment tank is equal to or higher than a predetermined value. The point is to put the sludge into the biological treatment tank.

生物処理槽の窒素MLSS負荷が所定値以上であれば、芽胞の発芽に適した環境であると判断して特定微生物群を含む汚泥が経路切替機構を介して生物処理槽に投入されて生物処理される。 If the nitrogen MLSS load in the biological treatment tank is equal to or higher than the specified value, it is judged that the environment is suitable for germination of spores, and sludge containing a specific microbial group is charged into the biological treatment tank via a route switching mechanism for biological treatment. Will be done.

同第三の特徴構成は、上述した第一または第二の特徴構成に加えて、前記生物処理槽の窒素MLSS負荷が所定値未満である場合に、前記リアクターで優占化され芽胞が形成された汚泥を前記生物処理槽より上流側に投入する点にある。 In the third characteristic configuration, in addition to the first or second characteristic configuration described above, when the nitrogen MLSS load of the biological treatment tank is less than a predetermined value, the reactor is dominated and spores are formed. The point is to put the sludge upstream from the biological treatment tank.

生物処理槽の窒素MLSS負荷が所定値未満であれば、生物処理槽が芽胞の発芽に適した環境ではないと判断して、経路切替機構を介して生物処理槽より上流側に特定微生物群を含む汚泥が投入され、上流側で発芽した特定微生物群を含む汚泥が生物処理槽に流入する。 If the nitrogen MLSS load in the biological treatment tank is less than the specified value, it is judged that the biological treatment tank is not an environment suitable for germination of buds, and a specific microorganism group is set upstream from the biological treatment tank via a route switching mechanism. The sludge containing it is thrown in, and the sludge containing the specific microbial group germinated on the upstream side flows into the biological treatment tank.

同第四の特徴構成は、上述した第一から第三の何れかの特徴構成に加えて、前記所定値は0.02kg-N/kg-MLSS・dに設定されている点にある。 The fourth feature configuration is that, in addition to any of the first to third feature configurations described above, the predetermined value is set to 0.02 kg-N / kg-MLSS · d.

同第五の特徴構成は、上述した第一から第四の何れかの特徴構成に加えて、前記生物処理槽は上流側から順に脱窒槽と硝化槽と固液分離槽を備え、前記リアクターは前記固液分離槽から引き抜いた汚泥を前記固液分離槽に戻す循環路に配置されている点にある。 In the fifth characteristic configuration, in addition to any of the above-mentioned first to fourth characteristic configurations, the biological treatment tank is provided with a denitrification tank, a nitrification tank, and a solid-liquid separation tank in order from the upstream side, and the reactor is The point is that the sludge drawn from the solid-liquid separation tank is arranged in a circulation path for returning it to the solid-liquid separation tank.

循環路に備えたリアクターで優占化した特定微生物群の芽胞を含む汚泥を、固液分離槽から生物処理槽または生物処理槽より上流側に返送することで発芽を促進して良好な生物処理を促進することができる。 Good biological treatment by promoting germination by returning sludge containing spores of specific microbial groups dominated by the reactor provided in the circulation channel from the solid-liquid separation tank to the biological treatment tank or upstream from the biological treatment tank. Can be promoted.

同第六の特徴構成は、上述した第一から第四の何れかの特徴構成に加えて、前記生物処理槽は上流側から順に脱窒槽と硝化槽と固液分離槽を備え、前記リアクターは前記固液分離槽から引き抜いた汚泥を前記脱窒槽に戻す循環路に配置されている点にある。 In the sixth characteristic configuration, in addition to any of the above-mentioned first to fourth characteristic configurations, the biological treatment tank is provided with a denitrification tank, a nitrification tank, and a solid-liquid separation tank in order from the upstream side, and the reactor is The point is that the sludge drawn from the solid-liquid separation tank is arranged in a circulation path for returning it to the denitrification tank.

リアクターで優占化した特定微生物群の芽胞を含む汚泥が循環路を介して脱窒槽に戻され、その後に生物処理槽の窒素MLSS負荷に基づいて固液分離槽から生物処理槽または生物処理槽の上流側に返送することで発芽を促進して良好な生物処理を促進することができる。 Sludge containing spores of specific microbial communities dominated by the reactor is returned to the denitrification tank via the circulation path, and then from the solid-liquid separation tank to the biological treatment tank or biological treatment tank based on the nitrogen MLSS load of the biological treatment tank. By returning it to the upstream side of the plant, germination can be promoted and good biological treatment can be promoted.

同第七の特徴構成は、上述した第一から第四の何れかの特徴構成に加えて、前記貯留槽と前記生物処理槽との間に前記固液分離槽から引き抜いた汚泥を導入して調質する汚泥調質槽をさらに備え、前記リアクターは前記汚泥調質槽に導入した汚泥を循環させる汚泥循環路に配置されている点にある。 In the seventh characteristic configuration, in addition to any of the first to fourth characteristic configurations described above, sludge extracted from the solid-liquid separation tank is introduced between the storage tank and the biological treatment tank. A sludge tempering tank for tempering is further provided, and the reactor is arranged in a sludge circulation path for circulating sludge introduced into the sludge tempering tank.

固液分離槽から引き抜いた汚泥が汚泥調質槽に導入され、導入された汚泥を循環させる汚泥循環路にリアクターを配置することにより、特定微生物群の優占化が促進され、優占化された汚泥が生物処理槽の窒素MLSS負荷に基づいて生物処理槽または生物処理槽の上流側に返送することで発芽を促進して良好な生物処理を促進することができる。 The sludge extracted from the solid-liquid separation tank is introduced into the sludge tempering tank, and by arranging the reactor in the sludge circulation path that circulates the introduced sludge, the dominance of specific microbial groups is promoted and made dominate. By returning the sludge to the upstream side of the biological treatment tank or the biological treatment tank based on the nitrogen MLSS load of the biological treatment tank, germination can be promoted and good biological treatment can be promoted.

同第八の特徴構成は、上述した第一から第四の何れかの特徴構成に加えて、有機性排水を受け入れ、前記貯留槽に送液する受入槽を備え、前記生物処理助剤が投入されるリアクターは、前記受入槽と、前記貯留槽と、前記生物処理槽の何れかに配置されている点にある。 In addition to the above-mentioned first to fourth characteristic configurations, the eighth characteristic configuration includes a receiving tank that receives organic wastewater and sends the liquid to the storage tank, and the biological treatment aid is added. The reactor to be generated is located in any of the receiving tank, the storage tank, and the biological treatment tank.

生物処理助剤が充填されたリアクターではなく、生物処理助剤を投入することによりリアクターとして機能させる場合には、受入槽と、貯留槽と、生物処理槽の何れに生物処理助剤を投入してもよい。 If the reactor is to function as a reactor by adding a biological treatment aid instead of a reactor filled with the biological treatment aid, the biological treatment aid is added to either the receiving tank, the storage tank, or the biological treatment tank. You may.

本発明による水処理方法の第一の特徴構成は、有機性排水を貯留する貯留槽と、前記貯留槽から送液された有機性排水を生物処理する生物処理槽と、前記生物処理槽から送液された有機性排水を固液分離する固液分離槽と、を備えている水処理設備における水処理方法であって、前記固液分離槽から引き抜いた汚泥が送液され、当該汚泥に含まれる特定微生物群を優占化する生物処理助剤が充填または投入されるリアクターにより特定微生物群を優占化するステップと、前記リアクターで優占化された特定微生物群の芽胞が含まれた汚泥を、前記生物処理槽に投入するか前記生物処理槽より上流側に投入するかを切り替える点にある。 The first characteristic configuration of the water treatment method according to the present invention is a storage tank for storing organic wastewater, a biological treatment tank for biologically treating organic wastewater sent from the storage tank, and a biological treatment tank for sending liquid from the biological treatment tank. It is a water treatment method in a water treatment facility equipped with a solid-liquid separation tank for solid-liquid separation of liquid organic wastewater, and sludge drawn from the solid-liquid separation tank is sent and contained in the sludge. A step of predominantly occupying a specific microbial community by a reactor filled or charged with a biological treatment aid that dominated the specific microbial community, and a sludge containing spores of the specific microbial community dominated by the reactor. Is to be switched between being charged into the biological treatment tank and being charged to the upstream side of the biological treatment tank.

以上説明した通り、本発明によれば、優占化された特定微生物群を効果的に生物処理に活用できる水処理設備及び水処理方法を提供することができるようになった。 As described above, according to the present invention, it has become possible to provide a water treatment facility and a water treatment method capable of effectively utilizing the dominated specific microorganism group for biological treatment.

(a),(b)は本発明による水処理設備の第一の実施形態の説明図(A) and (b) are explanatory views of the first embodiment of the water treatment equipment according to this invention. (a),(b)本発明による水処理設備の第二の実施形態の説明図(A), (b) Explanatory drawing of the second embodiment of the water treatment facility according to the present invention. (a),(b)本発明による水処理設備の第三の実施形態の説明図(A), (b) Explanatory drawing of the third embodiment of the water treatment facility according to the present invention. (a),(b)本発明による水処理設備の第四の実施形態の説明図(A), (b) Explanatory drawing of the fourth embodiment of the water treatment facility according to the present invention. (a),(b)本発明による水処理設備の第四の実施形態の説明図(A), (b) Explanatory drawing of the fourth embodiment of the water treatment facility according to the present invention.

以下、本発明による水処理設備及び水処理方法の実施形態を説明する。
[第1の態様]
図1(a),(b)に示すように、水処理設備10は、し尿や浄化槽汚泥を含む有機性排水を受け入れる受入槽1と、受入槽1に受け入れた有機性排水に含まれるし渣などの夾雑物を除渣する前処理設備2と、前処理設備2で除渣された後の有機性排水を貯留する貯留槽3と、貯留槽3から送液された有機性排水を生物処理する生物処理槽4と、生物処理槽4から送液された有機性排水を固液分離する固液分離槽5と、固液分離槽5で分離された余剰汚泥を貯留する汚泥貯留槽6などを備えている。
Hereinafter, embodiments of the water treatment equipment and the water treatment method according to the present invention will be described.
[First aspect]
As shown in FIGS. 1A and 1B, the water treatment facility 10 includes a receiving tank 1 that receives organic wastewater containing human waste and septic tank sludge, and a residue contained in the organic wastewater received in the receiving tank 1. The pretreatment facility 2 that removes contaminants such as, the storage tank 3 that stores the organic wastewater after the residue is removed by the pretreatment facility 2, and the organic wastewater sent from the storage tank 3 are biologically treated. A biological treatment tank 4 to be used, a solid-liquid separation tank 5 for solid-liquid separation of organic wastewater sent from the biological treatment tank 4, a sludge storage tank 6 for storing excess sludge separated by the solid-liquid separation tank 5, and the like. It is equipped with.

生物処理槽4は微生物の集合体である活性汚泥を用いて有機性排水を生物処理する槽で、好気状態で有機性排水に含まれるBODを分解するとともにアンモニア性窒素を硝酸性窒素に硝化する硝化槽4Bと、硝化槽4Bで硝化された硝酸性窒素を嫌気状態で窒素ガスに還元して有機性排水から窒素を除去する脱窒槽4Aを備えている。なお、本実施形態では有機性排水としてし尿や浄化槽汚泥が対象となるが、し尿や浄化槽汚泥以外に下水汚泥、生活排水、食品工場などで生じる工場排水、家畜の糞尿などの各種の有機性排水も対象となる。硝化槽4Bと固液分離槽5を同一の処理槽に一体に構成することも可能であり、固液分離槽5は生物処理槽4の一つの構成要素として位置付けることも可能である。 The biological treatment tank 4 is a tank that biologically treats organic wastewater using active sludge, which is an aggregate of microorganisms. It decomposes BOD contained in organic wastewater in an aerobic state and nitrifies ammoniacal nitrogen into nitrate nitrogen. It is provided with a nitrifying tank 4B for nitrifying and a denitrifying tank 4A for removing nitrogen from organic wastewater by reducing nitrifying nitrogen nitrified in the nitrifying tank 4B to nitrogen gas in an anaerobic state. In this embodiment, human waste and septic tank sludge are targeted as organic wastewater, but in addition to human waste and septic tank sludge, various organic wastewater such as sewage sludge, domestic wastewater, factory wastewater generated in food factories, and livestock manure Is also a target. The nitrification tank 4B and the solid-liquid separation tank 5 can be integrally configured in the same treatment tank, and the solid-liquid separation tank 5 can be positioned as one component of the biological treatment tank 4.

活性汚泥中の微生物は、有機性排水に含まれるBODを二酸化炭素、水、アンモニア性窒素などの無機物に分解し、アデノシン三リン酸(ATP)を産生する異化反応を生起し、産生したアデノシン三リン酸(ATP)と有機物からアミノ酸などを生合成する同化反応を生起する。生合成物は微生物の細胞成分や分泌物となる。一部の生合成物は、自己酸化反応によって二酸化炭素や水になって消失する。 Microorganisms in active sludge decompose BOD contained in organic wastewater into inorganic substances such as carbon dioxide, water, and ammoniacal nitrogen, and cause a catabolic reaction to produce adenosine triphosphate (ATP). It causes an assimilation reaction that biosynthesizes amino acids and the like from phosphoric acid (ATP) and organic substances. Biosynthesis becomes cellular components and secretions of microorganisms. Some biosynthesis disappears as carbon dioxide or water by self-oxidation reaction.

固液分離槽5は生物処理槽4で有機性排水が生物処理された後の処理水と汚泥とを固液分離する槽であり、本実施形態では槽内に膜分離装置Mが浸漬配置されて構成され、膜分離装置Mの分離膜を介して汚泥と分離された分離液が処理水として取り出される。 The solid-liquid separation tank 5 is a tank that separates the treated water and sludge after the organic wastewater is biologically treated in the biological treatment tank 4, and in this embodiment, the membrane separation device M is immersed and arranged in the tank. The separated liquid separated from the sludge via the separation membrane of the membrane separation device M is taken out as treated water.

膜分離装置Mを硝化槽4Bに浸漬配置して固液分離槽5と硝化槽4Bを兼用するように構成してもよい。また、膜分離装置Mを備えた固液分離槽5に代えて汚泥を沈降させて上澄み液となる被処理水を取り出す沈殿槽を固液分離槽5として用いることも可能である。 The membrane separation device M may be immersed in the nitrification tank 4B so as to be used as both the solid-liquid separation tank 5 and the nitrification tank 4B. Further, instead of the solid-liquid separation tank 5 provided with the membrane separation device M, a settling tank in which sludge is settled and water to be treated as a supernatant liquid is taken out can be used as the solid-liquid separation tank 5.

硝化槽4B及び固液分離槽5には散気装置Aが設置されており槽内が好気状態に維持されている。固液分離槽5で固液分離された処理水は活性炭吸着設備などを用いて高度処理し、高度処理した処理水は消毒設備で消毒した後に河川など外部に放流する。 An air diffuser A is installed in the nitrification tank 4B and the solid-liquid separation tank 5, and the inside of the tank is maintained in an aerobic state. The treated water separated by the solid-liquid separation tank 5 is highly treated using an activated carbon adsorption facility or the like, and the highly treated treated water is disinfected by a disinfection facility and then discharged to the outside such as a river.

生物処理の過程で増殖し固液分離槽5からポンプを介して引き出された余剰汚泥の一部は汚泥貯留槽6に貯留され、その後に例えばフィルタプレス式脱水機やスクリュープレス式脱水機などでなる脱水機7により脱水される。脱水機7で脱水された脱水ケーキは脱水ケーキホッパに貯留され、脱水ケーキホッパから取り出された後に肥料として資源化処理され、または焼却処理される。なお、複数のフィルタプレス式脱水機を備えるなど余剰汚泥を連続的に脱水処理可能な場合には汚泥貯留槽6は不要となる。 A part of the excess sludge that proliferates in the process of biological treatment and is drawn out from the solid-liquid separation tank 5 via a pump is stored in the sludge storage tank 6, and then, for example, in a filter press type dehydrator or a screw press type dehydrator. Is dehydrated by the dehydrator 7. The dehydrated cake dehydrated by the dehydrator 7 is stored in the dehydrated cake hopper, taken out from the dehydrated cake hopper, and then recycled as fertilizer or incinerated. The sludge storage tank 6 becomes unnecessary when the excess sludge can be continuously dehydrated, such as by providing a plurality of filter press type dehydrators.

固液分離槽5からポンプを介して引き出された余剰汚泥の一部は第1循環路R1を介して脱窒素槽4Aに返送汚泥として戻されて、硝化処理された汚泥に含まれる硝酸性窒素を窒素ガスに還元する脱窒素処理が行なわれる。 A part of the excess sludge drawn from the solid-liquid separation tank 5 via the pump is returned to the denitrification tank 4A via the first circulation path R1 as sludge, and nitrate nitrogen contained in the nitrified sludge. Is denitrified to reduce it to nitrogen gas.

また、余剰汚泥の一部は第2循環路R2を介して受入槽1から生物処理槽4の間の何れかから固液分離槽5までの間を循環するように構成され、第2循環路R2にはリアクター8が設けられている。リアクター8は、活性汚泥を構成する微生物のうち特定微生物群を優占化する生物処理助剤が充填された装置で、ケーシングの内部に生物処理助剤が保持された容器が設置されている。容器は内部に汚泥が通流するように少なくとも上下がパンチングメタルを含むメッシュ状の支持板で挟まれている。 Further, a part of the excess sludge is configured to circulate from any of the receiving tank 1 to the biological treatment tank 4 to the solid-liquid separation tank 5 via the second circulation passage R2, and is configured to circulate in the second circulation passage. R2 is provided with a reactor 8. The reactor 8 is a device filled with a biological treatment aid that dominates a specific group of microorganisms among the microorganisms constituting activated sludge, and a container in which the biological treatment aid is held is installed inside the casing. The container is sandwiched between mesh-shaped support plates containing punching metal at least at the top and bottom so that sludge can flow inside.

生物処理助剤として、ペレット状に成形した腐植成分やミネラル塊、詳しくは腐植、腐植抽出物、フミン酸、フルボ酸、珪砂、珪石等のうちの一種または複数種が用いられる。 As the biological treatment aid, one or more of pellet-shaped humus components and mineral lumps, specifically humus, humus extract, humic acid, fulvic acid, silica sand, silica stone and the like are used.

固液分離槽5の汚泥に含まれる微生物は、栄養源となるBOD濃度が低いために、自分の細胞質を補充することなく代謝する内生呼吸(自己酸化)により減容化される傾向にある。しかし、通性嫌気性菌である土壌微生物群、例えばバチルス属細菌のような土壌微生物群は不等分裂して休眠細胞である芽胞を形成して生存する。特に上述した生物処理助剤の下では強固な芽胞が形成される。そのため、このような成分からなる生物処理助剤に汚泥が接触すると通性嫌気性菌である土壌微生物群が優占化されるようになる。この様なリアクター8が導入された設備をASB(Activation of Soil Bacteria)導入設備という。 Microorganisms contained in the sludge of the solid-liquid separation tank 5 tend to be reduced in volume by endogenous respiration (self-oxidation) that metabolizes without supplementing their own cytoplasm because the concentration of BOD as a nutrient source is low. .. However, soil microorganisms that are facultative anaerobic bacteria, for example, soil microorganisms such as Bacillus bacteria, divide unequally to form spores that are dormant cells and survive. Strong spores are formed, especially under the biotreatment aids described above. Therefore, when sludge comes into contact with a biological treatment aid composed of such components, soil microorganisms, which are facultative anaerobes, become dominant. The equipment in which such a reactor 8 is introduced is called an ASB (Activation of Soil Bacteria) introduction equipment.

芽胞が形成された土壌微生物を含む土壌微生物群は栄養源となるBOD濃度が十分な環境になると、発芽して等分裂を繰り返して栄養増殖するが、十分な栄養源がないと発芽が良好に行われず、効率的な生物処理が実現できなくなる。 Soil microorganisms including soil microorganisms in which spores are formed germinate and repeat equal division to proliferate when the BOD concentration as a nutrient source becomes sufficient, but germination is good if there is no sufficient nutrient source. It will not be done and efficient biological treatment will not be realized.

そこで、リアクター8で優占化され芽胞が形成された土壌微生物を含む汚泥を、生物処理槽4の窒素MLSS負荷に基づいて、生物処理槽4に投入するか生物処理槽4より上流側に投入するかを切り替える経路切替機構11を備えている。なお、生物処理槽4の窒素MLSS負荷とは、脱窒素槽4Aまたは硝化槽4Bの何れかの窒素MLSS負荷をいう。窒素MLSS負荷をセンサにより計測する場合には、脱窒素槽4Aまたは硝化槽4Bにセンサが設置される。 Therefore, sludge containing soil microorganisms dominated by the reactor 8 and having spores formed is charged into the biological treatment tank 4 or upstream from the biological treatment tank 4 based on the nitrogen MLSS load of the biological treatment tank 4. It is provided with a route switching mechanism 11 for switching between the two. The nitrogen MLSS load of the biological treatment tank 4 means the nitrogen MLSS load of either the denitrification tank 4A or the nitrification tank 4B. When measuring the nitrogen MLSS load with a sensor, the sensor is installed in the denitrification tank 4A or the nitrification tank 4B.

経路切替機構11は、上述した第2循環路R2に設けられたバルブ11A,11Bで構成され、バルブ11A,11Bを切り替えることにより、リアクター8で優占化され芽胞が形成された汚泥の循環先を切り替えることができるように構成されている。 The route switching mechanism 11 is composed of valves 11A and 11B provided in the second circulation path R2 described above, and by switching the valves 11A and 11B, the sludge circulation destination that is dominated by the reactor 8 and has spores formed. Is configured to be able to switch.

図1(a)には、バルブ11Aが閉塞され、バルブ11Bが解放された状態が示されている。この場合、リアクター8を経た汚泥は、有機性排水を受け入れた受入槽1、貯留槽3、または貯留槽3から生物処理槽4へ有機性排水を送水する経路の何れか、つまり生物処理槽4より上流側に循環供給される。なお、受入槽1、貯留槽3、または貯留槽3から生物処理槽4へ有機性排水を送水する経路の全てに汚泥が供給されるように構成してもよいし、任意の組み合わせで汚泥が供給されるように構成してもよい。 FIG. 1A shows a state in which the valve 11A is closed and the valve 11B is released. In this case, the sludge that has passed through the reactor 8 is either a receiving tank 1 that receives organic wastewater, a storage tank 3, or a route for sending organic wastewater from the storage tank 3 to the biological treatment tank 4, that is, the biological treatment tank 4. It is circulated and supplied to the upstream side. In addition, sludge may be supplied to all of the routes for sending organic wastewater from the receiving tank 1, the storage tank 3, or the storage tank 3 to the biological treatment tank 4, or the sludge may be supplied in any combination. It may be configured to be supplied.

図1(b)には、バルブ11Aが解放され、バルブ11Bが閉塞された状態が示されている。この場合、リアクター8を経た汚泥は、生物処理槽4のうち脱窒槽4Aに循環供給される。 FIG. 1B shows a state in which the valve 11A is released and the valve 11B is closed. In this case, the sludge that has passed through the reactor 8 is circulated and supplied to the denitrification tank 4A of the biological treatment tank 4.

生物処理槽4の窒素MLSS負荷が所定値未満である場合に生物処理槽4での効率的な発芽が期待できないため、生物処理槽4より窒素MLSS負荷が高い受入槽1、貯留槽3、または貯留槽3から生物処理槽4へ有機性排水を送水する経路に汚泥を投入するように経路切替機構11を機能させることで、発芽の促進を図る。 When the nitrogen MLSS load of the biological treatment tank 4 is less than a predetermined value, efficient germination in the biological treatment tank 4 cannot be expected. Therefore, the receiving tank 1, the storage tank 3, or the storage tank 3 having a higher nitrogen MLSS load than the biological treatment tank 4 By making the route switching mechanism 11 function so as to put sludge into the route for sending organic wastewater from the storage tank 3 to the biological treatment tank 4, germination is promoted.

生物処理槽4の窒素MLSS負荷が所定値以上である場合に生物処理槽4での効率的な発芽が期待できるため、生物処理槽4に汚泥を投入するように経路切替機構11を機能させることで、生物処理槽4での発芽の促進を図る。 Since efficient germination can be expected in the biological treatment tank 4 when the nitrogen MLSS load of the biological treatment tank 4 is equal to or higher than a predetermined value, the route switching mechanism 11 is made to function so as to put sludge into the biological treatment tank 4. Then, the germination in the biological treatment tank 4 is promoted.

経路切替機構11により経路を切り替える指標となる窒素MLSS負荷の所定値は0.02kg-N/kg-MLSS・dに設定されていることが好ましい。0.02kg-N/kg-MLSS・d未満であれば、生物処理槽4で良好な発芽が期待できず、0.02kg-N/kg-MLSS・d以上であれば、生物処理槽4で良好な発芽が期待できる。 It is preferable that the predetermined value of the nitrogen MLSS load, which is an index for switching the route by the route switching mechanism 11, is set to 0.02 kg-N / kg-MLSS · d. If it is less than 0.02 kg-N / kg-MLSS · d, good germination cannot be expected in the biological treatment tank 4, and if it is 0.02 kg-N / kg-MLSS · d or more, it is in the biological treatment tank 4. Good germination can be expected.

[第2の態様]
図2(a),(b)に示すように、生物処理槽4を上流側から順に脱窒槽4Aと硝化槽4Bと固液分離槽5を備えて構成し、リアクター8を固液分離槽5から引き抜いた汚泥を固液分離槽5に戻す第3循環路R3に配置することも可能である。
[Second aspect]
As shown in FIGS. 2A and 2B, the biological treatment tank 4 is configured to include a denitrification tank 4A, a nitrification tank 4B, and a solid-liquid separation tank 5 in order from the upstream side, and the reactor 8 is a solid-liquid separation tank 5. It is also possible to arrange the sludge extracted from the above in the third circulation path R3 for returning it to the solid-liquid separation tank 5.

第3循環路R3に備えたリアクター8で優占化した特定微生物群の芽胞を含む汚泥を、固液分離槽5から第2循環路R2を経由して、特定微生物群を含む汚泥が生物処理槽4または生物処理槽4より上流側に返送することで発芽を促進して良好な生物処理を促進することができる。 The sludge containing the spores of the specific microbial group dominated by the reactor 8 provided in the third circulation path R3 is biologically treated by the sludge containing the specific microbial group from the solid-liquid separation tank 5 via the second circulation path R2. By returning to the upstream side of the tank 4 or the biological treatment tank 4, germination can be promoted and good biological treatment can be promoted.

この場合も、生物処理槽4の窒素MLSS負荷に基づいて、第2循環路R2に設けられたバルブ11A,11Bで構成される経路切替機構11を介して、汚泥を生物処理槽4に投入するか生物処理槽4より上流側に投入するかを切り替えることになる。 Also in this case, sludge is charged into the biological treatment tank 4 via the path switching mechanism 11 composed of valves 11A and 11B provided in the second circulation path R2 based on the nitrogen MLSS load of the biological treatment tank 4. It will be switched whether to put it on the upstream side of the biological treatment tank 4.

図2(a)は、生物処理槽4の窒素MLSS負荷が所定値未満であるため、優占化された汚泥が固液分離槽5及び第2循環路R2を経由して、生物処理槽4より窒素MLSS負荷が高い受入槽1、貯留槽3、または貯留槽3から生物処理槽4へ有機性排水を送水する経路に投入される態様が示されている。 In FIG. 2A, since the nitrogen MLSS load of the biological treatment tank 4 is less than a predetermined value, the predominant sludge passes through the solid-liquid separation tank 5 and the second circulation path R2, and the biological treatment tank 4 An embodiment in which organic wastewater is sent from a receiving tank 1, a storage tank 3, or a storage tank 3 having a higher nitrogen MLSS load to a biological treatment tank 4 is shown.

図2(b)は、生物処理槽4の窒素MLSS負荷が所定値以上であるため、優占化された汚泥が固液分離槽5及び第2循環路R2を経由して、生物処理槽4に投入される態様が示されている。 In FIG. 2B, since the nitrogen MLSS load of the biological treatment tank 4 is equal to or higher than a predetermined value, the dominant sludge passes through the solid-liquid separation tank 5 and the second circulation path R2, and the biological treatment tank 4 The mode to be put into is shown.

[第3の態様]
図3(a),(b)に示すように、生物処理槽4を上流側から順に脱窒槽4Aと硝化槽4Bと固液分離槽5を備えて構成し、リアクター8を固液分離槽5から引き抜いた汚泥を脱窒槽4Aに戻す第1循環路R1に配置してもよい。この場合、リアクター8で優占化した特定微生物群の芽胞を含む汚泥が、先ず脱窒槽4Aに投入される。
[Third aspect]
As shown in FIGS. 3A and 3B, the biological treatment tank 4 is configured to include a denitrification tank 4A, a nitrification tank 4B, and a solid-liquid separation tank 5 in order from the upstream side, and the reactor 8 is a solid-liquid separation tank 5. The sludge extracted from the above may be arranged in the first circulation path R1 for returning the sludge to the denitrification tank 4A. In this case, the sludge containing the spores of the specific microbial group dominated by the reactor 8 is first charged into the denitrification tank 4A.

図3(a)に示すように、脱窒槽4Aの窒素MLSS負荷が所定値未満であれば生物処理槽4で十分に発芽することなく、固液分離槽5から第2循環路R2に備えた経路切替機構11を介して生物処理槽4の上流側に投入され、発芽が促進された汚泥が生物処理槽4に流入する。 As shown in FIG. 3A, if the nitrogen MLSS load of the denitrification tank 4A is less than a predetermined value, the biological treatment tank 4 does not germinate sufficiently, and the solid-liquid separation tank 5 is provided in the second circulation path R2. Sludge that has been introduced to the upstream side of the biological treatment tank 4 via the route switching mechanism 11 and whose germination has been promoted flows into the biological treatment tank 4.

図3(b)に示すように、脱窒槽4Aの窒素MLSS負荷が所定値以上であれば生物処理槽4で十分に発芽するため、固液分離槽5から第2循環路R2に備えた経路切替機構11を介して再度生物処理槽4に循環投入される。 As shown in FIG. 3B, if the nitrogen MLSS load of the denitrification tank 4A is equal to or higher than a predetermined value, germination is sufficient in the biological treatment tank 4, so that the route provided from the solid-liquid separation tank 5 to the second circulation path R2 is provided. It is circulated and charged into the biological treatment tank 4 again via the switching mechanism 11.

[第4の態様]
図4(a),(b)に示すように、貯留槽3と生物処理槽4との間に固液分離槽5から引き抜いた汚泥を導入して調質する汚泥調質槽9をさらに備え、汚泥調質槽9に導入した汚泥を循環させる汚泥循環路R4にリアクター8を配置してもよい。汚泥循環路R4は汚泥調質槽9の外部に形成してもよいし、汚泥調質槽9の内部に形成してもよい。後者の場合には、汚泥調質槽9の内部に発生させた汚泥循環路にリアクター8が配置されるので、リアクター8は汚泥調質槽9の内部に配置されることになる。
[Fourth aspect]
As shown in FIGS. 4A and 4B, a sludge tempering tank 9 is further provided between the storage tank 3 and the biological treatment tank 4 in which sludge extracted from the solid-liquid separation tank 5 is introduced and tempered. , The reactor 8 may be arranged in the sludge circulation path R4 that circulates the sludge introduced into the sludge tempering tank 9. The sludge circulation path R4 may be formed outside the sludge tempering tank 9 or may be formed inside the sludge tempering tank 9. In the latter case, since the reactor 8 is arranged in the sludge circulation path generated inside the sludge tempering tank 9, the reactor 8 is arranged inside the sludge tempering tank 9.

汚泥調質槽9に導入された汚泥は、ポンプを介してリアクター8との間に形成される循環路R4に沿って循環される。汚泥調質槽9からポンプアップされた汚泥は上方の流入部からリアクター8に流入し、ケーシングの底部に備えた散気装置により散気されつつケーシング内で循環し、その後ケーシング上方の流出部から汚泥調質槽9に返送される。 The sludge introduced into the sludge tempering tank 9 is circulated along the circulation path R4 formed between the sludge and the reactor 8 via a pump. The sludge pumped up from the sludge tempering tank 9 flows into the reactor 8 from the upper inflow portion, circulates in the casing while being dispersed by the air diffuser provided at the bottom of the casing, and then circulates in the casing from the outflow portion above the casing. It is returned to the sludge tempering tank 9.

汚泥調質槽9を含めてこの循環路R4を循環する汚泥には生物処理槽4に供給される有機性排水のような高BODを有する環境下には無く、また散気装置Aからの散気によって自己酸化反応が促進される過酷な環境となる。 The sludge circulating in this circulation path R4 including the sludge tempering tank 9 does not exist in an environment having a high BOD like the organic wastewater supplied to the biological treatment tank 4, and is also dispersed from the air diffuser A. It becomes a harsh environment where the self-oxidation reaction is promoted by the air.

バチルス属細菌などの有芽胞菌は芽胞を形成して耐久性を発揮するが、他の微生物は淘汰されるようになる。その結果、汚泥調質槽9に導かれた汚泥は効果的に特定微生物群に優占化され、汚泥全体として効果的に減容化される。 Spore-forming bacteria such as Bacillus bacteria form spores and exhibit durability, but other microorganisms are culled. As a result, the sludge guided to the sludge tempering tank 9 is effectively dominated by the specific microorganism group, and the volume of the sludge as a whole is effectively reduced.

また、そのようにして優占化された特定微生物群が、生物処理槽4の窒素MLSS負荷に基づいて、汚泥調質槽9から経路切替機構11(11A,11B,11C)を介して生物処理槽4または生物処理槽4の上流側に投入されるので、生物処理槽4に導かれる有機性排水に含まれる有機物に対する分解効率が向上するとともに余剰汚泥の発生量自体も少なくなる。 Further, the specific microbial group thus dominated is biologically treated from the sludge tempering tank 9 via the route switching mechanism 11 (11A, 11B, 11C) based on the nitrogen MLSS load of the biological treatment tank 4. Since it is charged into the tank 4 or the upstream side of the biological treatment tank 4, the decomposition efficiency of the organic matter contained in the organic wastewater guided to the biological treatment tank 4 is improved, and the amount of excess sludge itself is reduced.

図4(a)は、生物処理槽4の窒素MLSS負荷が所定値未満の場合で、優占化された特定微生物群が汚泥調質槽9から経路切替機構11を介して生物処理槽4より上流側に投入される態様を示し、図4(b)は、生物処理槽4の窒素MLSS負荷が所定値以上の場合で、優占化された特定微生物群が汚泥調質槽9から経路切替機構11を介して生物処理槽4に投入される態様を示している。 FIG. 4A shows a case where the nitrogen MLSS load of the biological treatment tank 4 is less than a predetermined value, and the dominated specific microorganism group is sent from the sludge tempering tank 9 to the biological treatment tank 4 via the route switching mechanism 11. FIG. 4B shows a mode in which the organism is charged to the upstream side, and FIG. 4 (b) shows a case where the nitrogen MLSS load of the biological treatment tank 4 is equal to or higher than a predetermined value, and the dominated specific microorganism group switches the route from the sludge tempering tank 9. It shows an embodiment of being charged into the biological treatment tank 4 via the mechanism 11.

[第5の態様]
上述した例では生物処理助剤を充填した専用のリアクター8を備えた態様を示したが、図5(a),(b)に示すように、受入槽1と、貯留槽3と、生物処理槽4の何れかに生物処理助剤を投入し、生物処理助剤が投入された処理槽をリアクター8として機能するように構成してもよい。
[Fifth aspect]
In the above-mentioned example, the embodiment provided with the dedicated reactor 8 filled with the biological treatment aid is shown, but as shown in FIGS. 5 (a) and 5 (b), the receiving tank 1, the storage tank 3, and the biological treatment are shown. The biological treatment aid may be charged into any of the tanks 4, and the treatment tank containing the biological treatment aid may be configured to function as the reactor 8.

また、第4の態様で示した汚泥調質槽9に生物処理助剤を投入し、生物処理助剤が投入された汚泥調質槽9をリアクター8として機能するように構成してもよい。汚泥調質槽9の汚泥は低BOD環境であり、生物処理助剤を投入する処理槽として最も好ましい。 Further, the sludge conditioning tank 9 shown in the fourth aspect may be configured to charge the biological treatment aid and the sludge tempering tank 9 into which the biological treatment auxiliary is charged to function as the reactor 8. The sludge in the sludge tempering tank 9 has a low BOD environment, and is most preferable as a treatment tank for charging a biological treatment aid.

以上説明したように、本発明による水処理方法は、有機性排水を貯留する貯留槽と、貯留槽から送液された有機性排水を生物処理する生物処理槽と、生物処理槽から送液された有機性排水を固液分離する固液分離槽と、を備えている水処理設備における水処理方法であって、固液分離槽から引き抜いた汚泥が送液され、当該汚泥に含まれる特定微生物群を優占化する生物処理助剤が充填または投入されるリアクターにより特定微生物群を優占化するステップと、リアクターで優占化された特定微生物群の芽胞が含まれた汚泥を、生物処理槽に投入するか生物処理槽より上流側に投入するかを切り替えるように構成されている。 As described above, the water treatment method according to the present invention is a storage tank for storing organic wastewater, a biological treatment tank for biologically treating the organic wastewater sent from the storage tank, and a biological treatment tank. It is a water treatment method in a water treatment facility equipped with a solid-liquid separation tank that separates organic wastewater into solid and liquid. Biological treatment of sludge containing spores of the specific microbial community dominated by the reactor and the step of dominated the specific microbial community by a reactor filled or charged with a biological treatment aid that occupies the herd. It is configured to switch between charging in the tank and charging upstream from the biological treatment tank.

上述した実施形態は本発明の一態様であり、該記載により本発明の技術的範囲が限定されるものではなく、大きさや素材の選択など各部の具体的構成は本発明の作用効果が奏される範囲で適宜変更設計可能であることはいうまでもない。 The above-described embodiment is an aspect of the present invention, and the description does not limit the technical scope of the present invention, and the specific configuration of each part such as the size and selection of the material exhibits the effects of the present invention. Needless to say, it is possible to change and design as appropriate within the range.

1:受入槽
2:前処理設備
3:貯留槽
4:生物処理槽
4A:脱窒槽
4B:硝化槽
5:固液分離槽
6:汚泥貯留槽
7:脱水機
8:リアクター
9:汚泥調質槽
10:水処理設備
11:経路切替機構
11A:バルブ
11B:バルブ
R1:第1循環路
R2:第2循環路
R3:第3循環路
R4:第4循環路
1: Receiving tank 2: Pretreatment equipment 3: Storage tank 4: Biological treatment tank 4A: Denitrification tank 4B: Nitrification tank 5: Solid-liquid separation tank 6: Sludge storage tank 7: Dehydrator 8: Reactor 9: Sludge tempering tank 10: Water treatment equipment 11: Path switching mechanism 11A: Valve 11B: Valve R1: First circulation path R2: Second circulation path R3: Third circulation path R4: Fourth circulation path

Claims (9)

有機性排水を貯留する貯留槽と、前記貯留槽から送液された有機性排水を生物処理する生物処理槽と、前記生物処理槽から送液された有機性排水を固液分離する固液分離槽と、を備えている水処理設備であって、
前記固液分離槽から引き抜いた汚泥が送液され、当該汚泥に含まれる特定微生物群を優占化する生物処理助剤が充填または投入されるリアクターと、
前記リアクターで優占化された特定微生物の芽胞が含まれた汚泥を、前記生物処理槽に投入するか前記生物処理槽より上流側に投入するかを切り替える経路切替機構を備えている水処理設備。
A storage tank for storing organic wastewater, a biological treatment tank for biologically treating organic wastewater sent from the storage tank, and a solid-liquid separation for solid-liquid separation of organic wastewater sent from the biological treatment tank. It is a water treatment facility equipped with a tank,
A reactor in which sludge drawn from the solid-liquid separation tank is sent and filled with or charged with a biological treatment aid that dominates a specific microbial group contained in the sludge.
A water treatment facility equipped with a route switching mechanism for switching whether sludge containing spores of a specific microorganism dominated by the reactor is charged into the biological treatment tank or upstream of the biological treatment tank. ..
前記生物処理槽の窒素MLSS負荷が所定値以上である場合に、前記リアクターで優占化された特定微生物の芽胞が含まれた汚泥を前記生物処理槽に投入する請求項1記載の水処理設備。 The water treatment facility according to claim 1, wherein when the nitrogen MLSS load of the biological treatment tank is equal to or higher than a predetermined value, sludge containing spores of a specific microorganism dominated by the reactor is charged into the biological treatment tank. .. 前記生物処理槽の窒素MLSS負荷が所定値未満である場合に、前記リアクターで優占化され芽胞が形成された汚泥を前記生物処理槽より上流側に投入する請求項1または2記載の水処理設備。 The water treatment according to claim 1 or 2, wherein when the nitrogen MLSS load of the biological treatment tank is less than a predetermined value, sludge dominated by the reactor and spores are formed is charged upstream of the biological treatment tank. Facility. 前記所定値は0.02kg-N/kg-MLSS・dに設定されている請求項1から3の何れかに記載の水処理設備。 The water treatment facility according to any one of claims 1 to 3, wherein the predetermined value is set to 0.02 kg-N / kg-MLSS · d. 前記生物処理槽は上流側から順に脱窒槽と硝化槽と固液分離槽を備え、前記リアクターは前記固液分離槽から引き抜いた汚泥を前記固液分離槽に戻す循環路に配置されている請求項1から4の何れかに記載の水処理設備。 The biological treatment tank is provided with a denitrification tank, a nitrification tank, and a solid-liquid separation tank in order from the upstream side, and the reactor is arranged in a circulation path for returning sludge drawn from the solid-liquid separation tank to the solid-liquid separation tank. The water treatment facility according to any one of Items 1 to 4. 前記生物処理槽は上流側から順に脱窒槽と硝化槽と固液分離槽を備え、前記リアクターは前記固液分離槽から引き抜いた汚泥を前記脱窒槽に戻す循環路に配置されている請求項1から4の何れかに記載の水処理設備。 The biological treatment tank includes a denitrification tank, a nitrification tank, and a solid-liquid separation tank in this order from the upstream side, and the reactor is arranged in a circulation path for returning sludge extracted from the solid-liquid separation tank to the denitrification tank. The water treatment equipment according to any one of 4 to 4. 前記貯留槽と前記生物処理槽との間に前記固液分離槽から引き抜いた汚泥を導入して調質する汚泥調質槽をさらに備え、前記リアクターは前記汚泥調質槽に導入した汚泥を循環させる汚泥循環路に配置されている請求項1から4の何れかに記載の水処理設備。 A sludge tempering tank for introducing and conditioning sludge extracted from the solid-liquid separation tank is further provided between the storage tank and the biological treatment tank, and the reactor circulates the sludge introduced into the sludge tempering tank. The water treatment facility according to any one of claims 1 to 4, which is arranged in a sludge circulation channel. 有機性排水を受け入れ、前記貯留槽に送液する受入槽を備え、
前記生物処理助剤が投入されるリアクターは、前記受入槽と、前記貯留槽と、前記生物処理槽の何れかに配置されている請求項1から4の何れかに記載の水処理設備。
Equipped with a receiving tank that receives organic wastewater and sends it to the storage tank.
The water treatment facility according to any one of claims 1 to 4, wherein the reactor into which the biological treatment aid is charged is located in any of the receiving tank, the storage tank, and the biological treatment tank.
有機性排水を貯留する貯留槽と、前記貯留槽から送液された有機性排水を生物処理する生物処理槽と、前記生物処理槽から送液された有機性排水を固液分離する固液分離槽と、を備えている水処理設備における水処理方法であって、
前記固液分離槽から引き抜いた汚泥が送液され、当該汚泥に含まれる特定微生物群を優占化する生物処理助剤が充填または投入されるリアクターにより特定微生物群を優占化するステップと、
前記リアクターで優占化された特定微生物群の芽胞が含まれた汚泥を、前記生物処理槽に投入するか前記生物処理槽より上流側に投入するかを切り替える水処理方法。
A storage tank for storing organic wastewater, a biological treatment tank for biologically treating organic wastewater sent from the storage tank, and a solid-liquid separation for solid-liquid separation of organic wastewater sent from the biological treatment tank. It is a water treatment method in a water treatment facility equipped with a tank.
A step of predominantly occupying a specific microbial group by a reactor in which sludge drawn from the solid-liquid separation tank is sent and filled with or charged with a biological treatment aid that occupies the specific microbial group contained in the sludge.
A water treatment method for switching whether sludge containing spores of a specific microbial group dominated by the reactor is charged into the biological treatment tank or upstream of the biological treatment tank.
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