JP2012110807A - Sewage treatment system - Google Patents

Sewage treatment system Download PDF

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JP2012110807A
JP2012110807A JP2010260228A JP2010260228A JP2012110807A JP 2012110807 A JP2012110807 A JP 2012110807A JP 2010260228 A JP2010260228 A JP 2010260228A JP 2010260228 A JP2010260228 A JP 2010260228A JP 2012110807 A JP2012110807 A JP 2012110807A
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raw water
tank
aerobic
activated sludge
treated raw
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JP5665502B2 (en
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Yuji Furuya
勇治 古屋
Shigehiro Suzuki
重浩 鈴木
Seiji Honma
誠二 本間
Hiroshi Shiomi
浩 塩見
Rina Kono
里名 河野
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Tokyo Metropolitan Government
Metawater Co Ltd
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Metawater 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)

Abstract

PROBLEM TO BE SOLVED: To control discharge of nitrous oxide gas to the atmosphere.SOLUTION: On the basis of the value of an ammonia nitrogen load in each of an oxygen-free tank 12 and aerobic tanks 13a to 13c inputted by a load detectors 19a to 19d, an inflow nitrogen load controller 21 controls the opening of valves 22a to 22d to supply raw water to the tanks each so that the ammonia nitrogen load in each tank may be lower than the prescribed value. The value of the ammonia nitrogen load in each of the aerobic tanks 13a to 13c is thereby kept lower than the prescribed value and the discharge of the nitrous oxide gas to the atmosphere can be controlled.

Description

本発明は、好気処理によって下水中に含まれるアンモニア性窒素を亜硝酸性窒素や硝酸性窒素に硝化する下水処理システムに関するものである。   The present invention relates to a sewage treatment system that nitrifies ammoniacal nitrogen contained in sewage to nitrite nitrogen or nitrate nitrogen by aerobic treatment.

生活排水や工場排水などの下水中に含まれるアンモニア性窒素は、下水の放流先となる湖沼や内湾などの閉鎖性水域における溶存酸素の低下や富栄養化現象の原因になることが知られている。このため、下水処理設備では好気処理が行われている。好気処理とは、反応槽内の下水に投入した、若しくは、下水中に元々存在する硝化菌などの好気性微生物を利用して、アンモニア性窒素を亜硝酸性窒素や硝酸性窒素に硝化する処理のことを意味する。   Ammonia nitrogen contained in sewage such as domestic and industrial wastewater is known to cause a decrease in dissolved oxygen and eutrophication in closed water areas such as lakes and inner bays where sewage is discharged. Yes. For this reason, aerobic treatment is performed in the sewage treatment facility. Aerobic treatment means nitrification of ammonia nitrogen into nitrite nitrogen or nitrate nitrogen by using aerobic microorganisms such as nitrifying bacteria that are introduced into the sewage in the reaction tank or originally exist in the sewage. Means processing.

このような好気処理では、微生物活動や反応槽の運転条件などの変化によって、反応副生成物として亜酸化窒素ガス（Ｎ２Ｏ）が発生することが知られている。亜酸化窒素ガスは温室効果ガスであり、その温室効果は二酸化炭素ガスの約３１０倍と非常に高い。また、亜酸化窒素ガスは、フロンガスと同様、成層圏のオゾン層を破壊するオゾン層破壊ガスとしても問題視されている。このため、大気中への亜酸化窒素ガスの放出を抑制することが地球環境保護の観点から急務となっている。 In such aerobic treatment, it is known that nitrous oxide gas (N 2 O) is generated as a reaction by-product due to changes in microbial activity, reaction tank operating conditions, and the like. Nitrous oxide gas is a greenhouse gas, and its greenhouse effect is as high as about 310 times that of carbon dioxide gas. Nitrous oxide gas is also regarded as a problem as an ozone depleting gas that destroys the stratospheric ozone layer, like chlorofluorocarbon gas. For this reason, it is an urgent task to suppress the release of nitrous oxide gas to the atmosphere from the viewpoint of protecting the global environment.

このような背景から、近年、大気中への亜酸化窒素ガスの放出を抑制するための発明が幾つか提案されている（特許文献１〜３参照）。特許文献１記載の発明は、亜酸化窒素ガスを溶解させた吸収液を無酸素槽に供給することにより、無酸素槽内の脱窒菌によって亜酸化窒素ガスを窒素ガスに還元するものである。特許文献２記載の発明は、亜酸化窒素ガスを含有する含有ガスを無酸素槽内に供給する前に、脱窒菌の反応を阻害する酸素を含有ガスから除去するものである。特許文献３記載の発明は、亜酸化窒素ガスを溶解させた吸収液を嫌気性条件下で処理することによって、亜酸化窒素ガスを窒素ガスに還元するものである。   Against this background, in recent years, several inventions for suppressing the release of nitrous oxide gas into the atmosphere have been proposed (see Patent Documents 1 to 3). The invention described in Patent Document 1 is to reduce the nitrous oxide gas to nitrogen gas by denitrifying bacteria in the oxygen-free tank by supplying an absorption liquid in which the nitrous oxide gas is dissolved to the oxygen-free tank. In the invention described in Patent Document 2, oxygen that inhibits the reaction of denitrifying bacteria is removed from the containing gas before the containing gas containing nitrous oxide gas is supplied into the anoxic tank. The invention described in Patent Document 3 reduces nitrous oxide gas to nitrogen gas by treating an absorbing solution in which nitrous oxide gas is dissolved under anaerobic conditions.

特開平１０−１２８３８９号公報JP-A-10-128389 特開２０００−２４６０５５号公報JP 2000-246055 A 特開２００２−２０４９２６号公報JP 2002-204926 A

しかしながら、特許文献１，３記載の発明によれば、吸収液を貯留するための吸収槽や吸収槽内で吸収液を循環させるための循環ポンプなどの付加的な装置を用意する必要がある。また、特許文献２記載の発明によれば、含有ガスから酸素を除去するための酸素除去装置を用意する必要がある。このため、特許文献１〜３記載の発明によれば、大気中への亜酸化窒素ガスの放出を抑制する下水処理システムを安価に構成することが困難であった。   However, according to the inventions described in Patent Documents 1 and 3, it is necessary to prepare an additional device such as an absorption tank for storing the absorption liquid and a circulation pump for circulating the absorption liquid in the absorption tank. Further, according to the invention described in Patent Document 2, it is necessary to prepare an oxygen removing device for removing oxygen from the contained gas. For this reason, according to invention of patent documents 1-3, it was difficult to comprise the sewage treatment system which suppresses discharge | release of the nitrous oxide gas to air | atmosphere at low cost.

本発明は、上記課題に鑑みてなされたものであって、その目的は、大気中への亜酸化窒素ガスの放出を安価に抑制可能な下水処理システムを提供することにある。   This invention is made | formed in view of the said subject, The objective is to provide the sewage treatment system which can suppress discharge | release of nitrous oxide gas to air | atmosphere at low cost.

上記課題を解決し、目的を達成するために、本発明の第１の態様に係る下水処理システムは、原水供給路から供給された原水が流入する、嫌気条件下で該原水中に含まれる有機物を活性汚泥に取り込むと共に該活性汚泥中に含まれるリンを該原水に放出する嫌気槽と、前記嫌気槽から流出した処理原水が流入する、無酸素条件下で該処理原水中に含まれる亜硝酸性窒素及び硝酸性窒素を窒素ガスに還元する無酸素槽と、前記無酸素槽から流出した処理原水が流入する、好気条件下で該処理原水中に含まれるアンモニア性窒素を亜硝酸性窒素及び硝酸性窒素に硝化すると共に該処理原水中に含まれるリンを活性汚泥中に取り込む、該処理原水の流れ方向に沿って配列された複数の好気槽と、前記好気槽から流出した処理原水が流入する、該処理原水に含まれる活性汚泥を沈殿させる沈殿槽と、前記沈殿槽内に堆積する活性汚泥を前記嫌気槽に返送する汚泥返送路と、最下流の前記好気槽内の硝化液を前記無酸素槽に循環する硝化液循環路と、前記複数の好気槽に各槽におけるアンモニア性窒素負荷を検出する負荷検出部と、前記窒素負荷検出部の検出結果に基づいて、前記原水供給路から供給された原水の一部を前記複数の好気槽及び前記無酸素槽に分配供給する原水ステップ流路と、を備える。   In order to solve the above-described problems and achieve the object, the sewage treatment system according to the first aspect of the present invention is an organic matter contained in the raw water under anaerobic conditions into which the raw water supplied from the raw water supply path flows. An anaerobic tank that takes in the activated sludge and releases phosphorus contained in the activated sludge to the raw water, and a nitrous acid contained in the treated raw water under anoxic conditions into which the treated raw water that has flowed out of the anaerobic tank flows. An oxygen-free tank that reduces the basic nitrogen and nitrate nitrogen to nitrogen gas, and the treated raw water that has flowed out of the oxygen-free tank flows in. Ammonia nitrogen contained in the treated raw water under aerobic conditions is converted to nitrite nitrogen. And a plurality of aerobic tanks arranged along the flow direction of the treated raw water, which are nitrified into nitrate nitrogen and take in phosphorus contained in the treated raw water into the activated sludge, and the treatment discharged from the aerobic tank Raw water inflow treatment A settling tank for precipitating activated sludge contained in water, a sludge return path for returning activated sludge deposited in the settling tank to the anaerobic tank, and a nitrifying solution in the most downstream aerobic tank in the anoxic tank A nitrifying liquid circulation path that circulates to the plurality of aerobic tanks, a load detection section that detects an ammonia nitrogen load in each tank, and a detection result of the nitrogen load detection section that is supplied from the raw water supply path. A raw water step flow path for distributing a part of the raw water to the plurality of aerobic tanks and the oxygen-free tank.

上記課題を解決し、目的を達成するために、本発明の第２の態様に係る下水処理システムは、原水供給路から供給された原水が流入する、嫌気条件下で該原水中に含まれる有機物を活性汚泥に取り込むと共に該活性汚泥中に含まれるリンを該原水に放出する嫌気槽と、前記嫌気槽から流出した処理原水が流入する、無酸素条件下で該処理原水中に含まれる亜硝酸性窒素及び硝酸性窒素を窒素ガスに還元する無酸素槽と、前記無酸素槽から流出した処理原水が流入する、好気条件下で該処理原水中に含まれるアンモニア性窒素を亜硝酸性窒素及び硝酸性窒素に硝化すると共に該処理原水中に含まれるリンを活性汚泥中に取り込む、該処理原水の流れ方向に沿って配列された複数の好気槽と、前記好気槽から流出した処理原水が流入する、該処理原水に含まれる活性汚泥を沈殿させる沈殿槽と、前記沈殿槽内に堆積する活性汚泥を前記嫌気槽に返送する汚泥返送路と、最下流の前記好気槽内の硝化液を前記無酸素槽に循環する硝化液循環路と、前記沈殿槽内における前記活性汚泥の滞留時間を制御する滞留時間制御部と、を備える。   In order to solve the above-described problems and achieve the object, the sewage treatment system according to the second aspect of the present invention is an organic matter contained in the raw water under anaerobic conditions into which the raw water supplied from the raw water supply path flows. An anaerobic tank that takes in the activated sludge and releases phosphorus contained in the activated sludge to the raw water, and a nitrous acid contained in the treated raw water under anoxic conditions into which the treated raw water that has flowed out of the anaerobic tank flows. An oxygen-free tank that reduces the basic nitrogen and nitrate nitrogen to nitrogen gas, and the treated raw water that has flowed out of the oxygen-free tank flows in. Ammonia nitrogen contained in the treated raw water under aerobic conditions is converted to nitrite nitrogen. And a plurality of aerobic tanks arranged along the flow direction of the treated raw water, which are nitrified into nitrate nitrogen and take in phosphorus contained in the treated raw water into the activated sludge, and the treatment discharged from the aerobic tank Raw water inflow treatment A settling tank for precipitating activated sludge contained in water, a sludge return path for returning activated sludge deposited in the settling tank to the anaerobic tank, and a nitrifying solution in the most downstream aerobic tank in the anoxic tank And a residence time control section for controlling the residence time of the activated sludge in the settling tank.

上記課題を解決し、目的を達成するために、本発明の第３の態様に係る下水処理システムは、原水供給路から供給された原水が流入する、嫌気条件下で該原水中に含まれる有機物を活性汚泥に取り込むと共に該活性汚泥中に含まれるリンを該原水に放出する嫌気槽と、前記嫌気槽から流出した処理原水が流入する、無酸素条件下で該処理原水中に含まれる亜硝酸性窒素及び硝酸性窒素を窒素ガスに還元する無酸素槽と、前記無酸素槽から流出した処理原水が流入する、好気条件下で該処理原水中に含まれるアンモニア性窒素を亜硝酸性窒素及び硝酸性窒素に硝化すると共に該処理原水中に含まれるリンを活性汚泥中に取り込む、該処理原水の流れ方向に沿って配列された複数の好気槽と、前記好気槽から流出した処理原水が流入する、該処理原水に含まれる活性汚泥を沈殿させる沈殿槽と、前記沈殿槽内に堆積する活性汚泥を前記嫌気槽に返送する汚泥返送路と、最下流の前記好気槽内の硝化液を前記無酸素槽に循環する硝化液循環路と、前記複数の好気槽内で発生した亜酸化窒素ガスの濃度を検出する濃度検出部と、前記濃度検出部の検出結果に基づいて、前記複数の好気槽内に存在する前記亜酸化窒素ガスを含有する含有ガスを前記無酸素槽に供給するガス供給路と、を備える。   In order to solve the above problems and achieve the object, the sewage treatment system according to the third aspect of the present invention is an organic matter contained in the raw water under anaerobic conditions into which the raw water supplied from the raw water supply path flows. An anaerobic tank that takes in the activated sludge and releases phosphorus contained in the activated sludge to the raw water, and a nitrous acid contained in the treated raw water under anoxic conditions into which the treated raw water that has flowed out of the anaerobic tank flows. An oxygen-free tank that reduces the basic nitrogen and nitrate nitrogen to nitrogen gas, and the treated raw water that has flowed out of the oxygen-free tank flows in. Ammonia nitrogen contained in the treated raw water under aerobic conditions is converted to nitrite nitrogen. And a plurality of aerobic tanks arranged along the flow direction of the treated raw water, which are nitrified into nitrate nitrogen and take in phosphorus contained in the treated raw water into the activated sludge, and the treatment discharged from the aerobic tank Raw water inflow treatment A settling tank for precipitating activated sludge contained in water, a sludge return path for returning activated sludge deposited in the settling tank to the anaerobic tank, and a nitrifying solution in the most downstream aerobic tank in the anoxic tank A plurality of aerobic tanks based on a detection result of the concentration detection unit, a concentration detection unit that detects the concentration of nitrous oxide gas generated in the plurality of aerobic tanks, And a gas supply path for supplying a gas containing the nitrous oxide gas existing in the oxygen-free tank.

上記課題を解決し、目的を達成するために、本発明の第４の態様に係る下水処理システムは、原水供給路から供給された原水が流入する、嫌気条件下で該原水中に含まれる有機物を活性汚泥に取り込むと共に該活性汚泥中に含まれるリンを該原水に放出する嫌気槽と、前記嫌気槽から流出した処理原水が流入する、無酸素条件下で該処理原水中に含まれる亜硝酸性窒素及び硝酸性窒素を窒素ガスに還元する無酸素槽と、前記無酸素槽から流出した処理原水が流入する、好気条件下で該処理原水中に含まれるアンモニア性窒素を亜硝酸性窒素及び硝酸性窒素に硝化すると共に該処理原水中に含まれるリンを活性汚泥中に取り込む、該処理原水の流れ方向に沿って配列された複数の好気槽と、前記好気槽から流出した処理原水が流入する、該処理原水に含まれる活性汚泥を沈殿させる沈殿槽と、前記沈殿槽内に堆積する活性汚泥を前記嫌気槽に返送する汚泥返送路と、最下流の前記好気槽内の硝化液を前記無酸素槽に循環する硝化液循環路と、前記複数の好気槽に各槽におけるアンモニア性窒素負荷を検出する負荷検出部と、前記窒素負荷検出部の検出結果に基づいて、前記原水供給路から供給された原水の一部を前記複数の好気槽及び前記無酸素槽に分配供給する原水ステップ流路と、前記沈殿槽内における前記活性汚泥の滞留時間を制御する滞留時間制御部と、前記複数の好気槽内で発生した亜酸化窒素ガスの濃度を検出する濃度検出部と、前記濃度検出部の検出結果に基づいて、前記複数の好気槽内に存在する前記亜酸化窒素ガスを含有する含有ガスを前記無酸素槽に供給するガス供給路と、を備える。   In order to solve the above-mentioned problems and achieve the object, the sewage treatment system according to the fourth aspect of the present invention is an organic matter contained in the raw water under anaerobic conditions into which the raw water supplied from the raw water supply channel flows. An anaerobic tank that takes in the activated sludge and releases phosphorus contained in the activated sludge to the raw water, and a nitrous acid contained in the treated raw water under anoxic conditions into which the treated raw water that has flowed out of the anaerobic tank flows. An oxygen-free tank that reduces the basic nitrogen and nitrate nitrogen to nitrogen gas, and the treated raw water that has flowed out of the oxygen-free tank flows in. Ammonia nitrogen contained in the treated raw water under aerobic conditions is converted to nitrite nitrogen. And a plurality of aerobic tanks arranged along the flow direction of the treated raw water, which are nitrified into nitrate nitrogen and take in phosphorus contained in the treated raw water into the activated sludge, and the treatment discharged from the aerobic tank Raw water inflow treatment A settling tank for precipitating activated sludge contained in water, a sludge return path for returning activated sludge deposited in the settling tank to the anaerobic tank, and a nitrifying solution in the most downstream aerobic tank in the anoxic tank A nitrifying liquid circulation path that circulates to the plurality of aerobic tanks, a load detection section that detects an ammonia nitrogen load in each tank, and a detection result of the nitrogen load detection section that is supplied from the raw water supply path. A raw water step channel for distributing a part of the raw water to the plurality of aerobic tanks and the oxygen-free tank, a residence time control unit for controlling the residence time of the activated sludge in the settling tank, A concentration detector that detects the concentration of nitrous oxide gas generated in the aerobic tank, and the nitrous oxide gas present in the plurality of aerobic tanks based on the detection result of the concentration detector Gas containing the gas contained in the oxygen-free tank Comprising a supply channel, a.

上記課題を解決し、目的を達成するために、本発明の第５の態様に係る下水処理システムは、原水供給路から供給された原水が流入する、好気条件下で該処理原水中に含まれるアンモニア性窒素を亜硝酸性窒素及び硝酸性窒素に硝化すると共に該処理原水中に含まれるリンを活性汚泥中に取り込む、該処理原水の流れ方向に沿って配列された複数の好気槽と、前記好気槽から流出した処理原水が流入する、該処理原水に含まれる活性汚泥を沈殿させる沈殿槽と、前記沈殿槽内に堆積する活性汚泥を１段目の前記好気槽に返送する汚泥返送路と、前記複数の好気槽のうち、２段目以後の各好気槽におけるアンモニア性窒素負荷を検出する負荷検出部と、前記窒素負荷検出部の検出結果に基づいて、前記原水供給路から供給された原水の一部を前記２段目以後の各好気槽に分配供給する原水ステップ流路と、を備える。   In order to solve the above problems and achieve the object, a sewage treatment system according to a fifth aspect of the present invention is included in the treated raw water under aerobic conditions into which raw water supplied from the raw water supply path flows. A plurality of aerobic tanks arranged along the flow direction of the treated raw water, wherein the ammonia nitrogen is nitrified into nitrite nitrogen and nitrate nitrogen and the phosphorus contained in the treated raw water is taken into the activated sludge; The raw processing water that has flowed out of the aerobic tank flows into the sedimentation tank that precipitates the activated sludge contained in the raw processing water, and the activated sludge that accumulates in the sedimentation tank is returned to the first aerobic tank. Based on the detection result of the sludge return path, the load detection unit for detecting the ammonia nitrogen load in each aerobic tank after the second stage among the plurality of aerobic tanks, and the detection result of the nitrogen load detection unit, the raw water A part of the raw water supplied from the supply channel Each aerobic tank of the second stage after and a raw water step flow path for supplying the distribution.

上記課題を解決し、目的を達成するために、本発明の第６の態様に係る下水処理システムは、原水供給路から供給された原水が流入する、好気条件下で該処理原水中に含まれるアンモニア性窒素を亜硝酸性窒素及び硝酸性窒素に硝化すると共に該処理原水中に含まれるリンを活性汚泥中に取り込む、該処理原水の流れ方向に沿って配列された複数の好気槽と、前記好気槽から流出した処理原水が流入する、該処理原水に含まれる活性汚泥を沈殿させる沈殿槽と、前記沈殿槽内に堆積する活性汚泥を１段目の前記好気槽に返送する汚泥返送路と、前記沈殿槽内における前記活性汚泥の滞留時間を制御する滞留時間制御部と、を備える。   In order to solve the above-described problems and achieve the object, a sewage treatment system according to a sixth aspect of the present invention is included in the treated raw water under aerobic conditions into which raw water supplied from the raw water supply path flows. A plurality of aerobic tanks arranged along the flow direction of the treated raw water, wherein the ammonia nitrogen is nitrified into nitrite nitrogen and nitrate nitrogen and the phosphorus contained in the treated raw water is taken into the activated sludge; The raw processing water that has flowed out of the aerobic tank flows into the sedimentation tank that precipitates the activated sludge contained in the raw processing water, and the activated sludge that accumulates in the sedimentation tank is returned to the first aerobic tank. A sludge return path, and a residence time control unit that controls a residence time of the activated sludge in the settling tank.

上記課題を解決し、目的を達成するために、本発明の第７の態様に係る下水処理システムは、原水供給路から供給された原水が流入する、好気条件下で該処理原水中に含まれるアンモニア性窒素を亜硝酸性窒素及び硝酸性窒素に硝化すると共に該処理原水中に含まれるリンを活性汚泥中に取り込む、該処理原水の流れ方向に沿って配列された複数の好気槽と、前記好気槽から流出した処理原水が流入する、該処理原水に含まれる活性汚泥を沈殿させる沈殿槽と、前記沈殿槽内に堆積する活性汚泥を１段目の前記好気槽に返送する汚泥返送路と、前記複数の好気槽のうち、２段目以後の各好気槽内で発生した亜酸化窒素ガスの濃度を検出する濃度検出部と、前記濃度検出部の検出結果に基づいて、２段目以後の各好気槽内に存在する前記亜酸化窒素ガスを含有する含有ガスを１段目の前記好気槽に供給するガス供給路と、を備える。   In order to solve the above problems and achieve the object, a sewage treatment system according to a seventh aspect of the present invention is included in the treated raw water under aerobic conditions into which raw water supplied from the raw water supply channel flows. A plurality of aerobic tanks arranged along the flow direction of the treated raw water, wherein the ammonia nitrogen is nitrified into nitrite nitrogen and nitrate nitrogen and the phosphorus contained in the treated raw water is taken into the activated sludge; The raw processing water that has flowed out of the aerobic tank flows into the sedimentation tank that precipitates the activated sludge contained in the raw processing water, and the activated sludge that accumulates in the sedimentation tank is returned to the first aerobic tank. Based on a sludge return path, a concentration detector that detects the concentration of nitrous oxide gas generated in each aerobic tank after the second stage among the plurality of aerobic tanks, and a detection result of the concentration detector The suboxidation present in each aerobic tank after the second stage And a gas supply path for supplying to the aerobic tank in the first stage the containing gas containing hydrogen gas.

上記課題を解決し、目的を達成するために、本発明の第８の態様に係る下水処理システムは、原水供給路から供給された原水が流入する、好気条件下で該処理原水中に含まれるアンモニア性窒素を亜硝酸性窒素及び硝酸性窒素に硝化すると共に該処理原水中に含まれるリンを活性汚泥中に取り込む、該処理原水の流れ方向に沿って配列された複数の好気槽と、前記好気槽から流出した処理原水が流入する、該処理原水に含まれる活性汚泥を沈殿させる沈殿槽と、前記沈殿槽内に堆積する活性汚泥を１段目の前記好気槽に返送する汚泥返送路と、前記複数の好気槽のうち、２段目以後の各好気槽におけるアンモニア性窒素負荷を検出する負荷検出部と、前記窒素負荷検出部の検出結果に基づいて、前記原水供給路から供給された原水の一部を前記２段目以後の各好気槽に分配供給する原水ステップ流路と、前記沈殿槽内における前記活性汚泥の滞留時間を制御する滞留時間制御部と、前記複数の好気槽のうち、２段目以後の各好気槽内で発生した亜酸化窒素ガスの濃度を検出する濃度検出部と、前記濃度検出部の検出結果に基づいて、２段目以後の各好気槽内に存在する前記亜酸化窒素ガスを含有する含有ガスを１段目の前記好気槽に供給するガス供給路と、を備える。   In order to solve the above problems and achieve the object, a sewage treatment system according to an eighth aspect of the present invention is included in the treated raw water under aerobic conditions into which raw water supplied from the raw water supply path flows. A plurality of aerobic tanks arranged along the flow direction of the treated raw water, wherein the ammonia nitrogen is nitrified into nitrite nitrogen and nitrate nitrogen and the phosphorus contained in the treated raw water is taken into the activated sludge; The raw processing water that has flowed out of the aerobic tank flows into the sedimentation tank that precipitates the activated sludge contained in the raw processing water, and the activated sludge that accumulates in the sedimentation tank is returned to the first aerobic tank. Based on the detection result of the sludge return path, the load detection unit for detecting the ammonia nitrogen load in each aerobic tank after the second stage among the plurality of aerobic tanks, and the detection result of the nitrogen load detection unit, the raw water A part of the raw water supplied from the supply channel A raw water step flow path that distributes and supplies each aerobic tank after the second stage, a residence time control unit that controls the residence time of the activated sludge in the settling tank, and two stages of the plurality of aerobic tanks A concentration detector that detects the concentration of nitrous oxide gas generated in each aerobic tank after the first, and the presence in each aerobic tank after the second stage based on the detection result of the concentration detector A gas supply path for supplying a gas containing nitrous oxide gas to the first aerobic tank.

本発明に係る下水処理システムによれば、大気中への亜酸化窒素ガスの放出を安価に抑制することができる。   According to the sewage treatment system according to the present invention, release of nitrous oxide gas into the atmosphere can be suppressed at a low cost.

図１は、本発明の第１の実施形態である下水処理システムの構成を示すブロック図である。FIG. 1 is a block diagram showing a configuration of a sewage treatment system according to the first embodiment of the present invention. 図２は、本発明の第２の実施形態である下水処理システムの構成を示すブロック図である。FIG. 2 is a block diagram showing a configuration of a sewage treatment system according to the second embodiment of the present invention. 図３は、本発明の第３の実施形態である下水処理システムの構成を示すブロック図である。FIG. 3 is a block diagram showing a configuration of a sewage treatment system according to the third embodiment of the present invention. 図４は、図１に示す下水処理システムの変形例の構成を示すブロック図である。FIG. 4 is a block diagram showing a configuration of a modified example of the sewage treatment system shown in FIG. 図５は、図２に示す下水処理システムの変形例の構成を示すブロック図である。FIG. 5 is a block diagram showing a configuration of a modified example of the sewage treatment system shown in FIG. 図６は、図３に示す下水処理システムの変形例の構成を示すブロック図である。FIG. 6 is a block diagram showing a configuration of a modified example of the sewage treatment system shown in FIG.

以下、図面を参照して、本発明の第１乃至第３の実施形態である下水処理システムの構成について説明する。   Hereinafter, the configuration of a sewage treatment system according to the first to third embodiments of the present invention will be described with reference to the drawings.

〔第１の実施形態〕
始めに、図１を参照して、本発明の第１の実施形態である下水処理システムの構成について説明する。 [First Embodiment]
First, with reference to FIG. 1, the structure of the sewage treatment system which is the 1st Embodiment of this invention is demonstrated.

図１は、本発明の第１の実施形態である下水処理システムの構成を示す模式図である。図１に示すように、本発明の第１の実施形態である下水処理システム１は、嫌気槽１１と、無酸素槽１２と、複数の好気槽１３ａ〜１３ｃと、沈殿槽１４と、汚泥返送路１５と、硝化液循環路１６と、を備える。   Drawing 1 is a mimetic diagram showing composition of a sewage treatment system which is a 1st embodiment of the present invention. As shown in FIG. 1, the sewage treatment system 1 which is the 1st Embodiment of this invention is the anaerobic tank 11, the anoxic tank 12, several aerobic tanks 13a-13c, the sedimentation tank 14, and sludge. A return path 15 and a nitrating liquid circulation path 16 are provided.

嫌気槽１１には、原水供給路１７から供給された原水が流入する。嫌気槽１１では、嫌気条件下で原水中に含まれる有機物が活性汚泥に取り込まれると共に、活性汚泥中に含まれるリンが原水中に放出される。   The raw water supplied from the raw water supply path 17 flows into the anaerobic tank 11. In the anaerobic tank 11, organic substances contained in the raw water are taken into the activated sludge under anaerobic conditions, and phosphorus contained in the activated sludge is released into the raw water.

無酸素槽１２には、嫌気槽１１から流出した処理原水が流入する。無酸素槽１２では、無酸素条件下で処理原水中に含まれる亜硝酸性窒素及び硝酸性窒素が窒素ガスに還元される。   The treated raw water that has flowed out of the anaerobic tank 11 flows into the anaerobic tank 12. In the oxygen-free tank 12, nitrite nitrogen and nitrate nitrogen contained in the treated raw water are reduced to nitrogen gas under oxygen-free conditions.

複数の好気槽１３ａ〜１３ｃは、処理原水の流れ方向に沿って直列に配列されている。複数の好気槽１３ａ〜１３ｃには、各好気槽の堰高を調整することによって、無酸素槽１２から流出した処理原水がステップ流入する。各好気槽には、貯留される活性汚泥に対して散気を行うための図示しない散気装置が備えられている。複数の好気槽１３ａ〜１３ｃでは、好気条件下で処理原水中に含まれるアンモニア性窒素が亜硝酸性窒素及び硝酸性窒素に硝化される共に処理原水中に含まれるリンが活性汚泥中に取り込まれる。   The plurality of aerobic tanks 13a to 13c are arranged in series along the flow direction of the treated raw water. The raw water treated from the anaerobic tank 12 flows into the plurality of aerobic tanks 13a to 13c by adjusting the weir height of each aerobic tank. Each aerobic tank is provided with an air diffuser (not shown) for performing air diffusion on the stored activated sludge. In the aerobic tanks 13a to 13c, ammonia nitrogen contained in the treated raw water is nitrified to nitrite nitrogen and nitrate nitrogen under aerobic conditions, and phosphorus contained in the treated raw water is contained in the activated sludge. It is captured.

沈殿槽１４には、最下流の好気槽１３ｃから流出した処理原水が流入する。沈殿槽１４では、処理原水が分離液と活性汚泥１８とに分離される。沈殿槽１４の側壁には、図示しない配管が接続されており、図示しない配管を介して消毒処理された分離液を系外に排出できるように構成されている。また、沈殿槽１４の底部には、汚泥返送路１５が接続されており、沈殿槽１４の底部に堆積した活性汚泥１８を嫌気槽１１に返送できるように構成されている。   The processing raw water that has flowed out from the most downstream aerobic tank 13 c flows into the settling tank 14. In the settling tank 14, the treated raw water is separated into a separation liquid and activated sludge 18. A pipe (not shown) is connected to the side wall of the settling tank 14 so that the sterilized separation liquid can be discharged out of the system through the pipe (not shown). Further, a sludge return path 15 is connected to the bottom of the sedimentation tank 14 so that the activated sludge 18 deposited on the bottom of the sedimentation tank 14 can be returned to the anaerobic tank 11.

硝化液循環路１６は、無酸素槽１２と最下流の好気槽１３ｃとを接続する配管であり、好気槽１３ｃ内の硝化液を無酸素槽１２に循環する。   The nitrification liquid circulation path 16 is a pipe connecting the anoxic tank 12 and the most downstream aerobic tank 13 c, and circulates the nitrating liquid in the aerobic tank 13 c to the anoxic tank 12.

本発明の第１の実施形態である下水処理システム１には、大気中への亜酸化窒素ガスの放出を抑制するために、負荷検出部１９ａ〜１９ｄと、原水ステップ流路２０と、流入窒素負荷制御装置２１と、が設けられている。   In the sewage treatment system 1 according to the first embodiment of the present invention, the load detectors 19a to 19d, the raw water step flow path 20, and the inflow nitrogen are used to suppress the release of nitrous oxide gas into the atmosphere. And a load control device 21.

負荷検出部１９ａ〜１９ｄはそれぞれ、無酸素槽１２及び好気槽１３ａ〜１３ｃに設けられている。負荷検出部１９ａ〜１９ｄは、各槽におけるアンモニア性窒素負荷（例えば、アンモニア酸化細菌量、亜硝酸酸化細菌量、アンモニア性窒素濃度、亜硝酸性窒素濃度、硝酸性窒素濃度、酸素消費速度など）を検出する。負荷検出部１９ａ〜１９ｄは、検出されたアンモニア性窒素負荷の値を流入窒素負荷制御装置２１に入力する。   The load detection units 19a to 19d are provided in the anoxic tank 12 and the aerobic tanks 13a to 13c, respectively. The load detection units 19a to 19d are ammonia nitrogen loads in each tank (for example, ammonia oxidizing bacteria amount, nitrite oxidizing bacteria amount, ammonia nitrogen concentration, nitrite nitrogen concentration, nitrate nitrogen concentration, oxygen consumption rate, etc.) Is detected. The load detection units 19 a to 19 d input the detected ammonia nitrogen load value to the inflow nitrogen load control device 21.

原水ステップ流路２０は、原水供給路１７から供給された原水の一部を無酸素槽１２及び好気槽１３ａ〜１３ｃに供給するための配管である。原水供給路１７から無酸素槽１２及び好気槽１３ａ〜１３ｃの各槽への原水の供給量はそれぞれ、バルブ２２ａ〜２２ｄの開度を制御することによって調整される。   The raw water step flow path 20 is a pipe for supplying a part of the raw water supplied from the raw water supply path 17 to the anoxic tank 12 and the aerobic tanks 13a to 13c. The amount of raw water supplied from the raw water supply path 17 to each of the oxygen-free tank 12 and the aerobic tanks 13a to 13c is adjusted by controlling the openings of the valves 22a to 22d, respectively.

流入窒素負荷制御装置２１は、ワークステーションやパーソナルコンピュータなどの情報処理装置によって構成されている。流入窒素負荷制御装置２１は、負荷検出部１９ａ〜１９ｄから入力された無酸素槽１２及び好気槽１３ａ〜１３ｃの各槽におけるアンモニア性窒素負荷の値に基づいて、各槽におけるアンモニア性窒素負荷が所定値未満になるようにバルブ２２ａ〜２２ｄの開度を制御して各槽に原水を供給する。例えば、負荷検出部１９ｄによって検出されたアンモニア性窒素負荷の値が所定値以上である場合、流入窒素負荷制御装置２１は、バルブ２２ｄを開くことによって好気槽１３ｃ内に原水を供給する。好気槽１３ａ〜１３ｃ内における亜酸化窒素ガスの発生量は、アンモニア性窒素負荷の増加に応じて増加する。従って、このようにアンモニア性窒素負荷の値に応じて好気槽１３ａ〜１３ｃに原水を供給することにより、好気槽１３ａ〜１３ｃ内におけるアンモニア性窒素負荷の値を所定値未満に保ち、大気中への亜酸化窒素ガスの放出を抑制することができる。   The inflow nitrogen load control device 21 is configured by an information processing device such as a workstation or a personal computer. Inflow nitrogen load control device 21 is based on the value of ammonia nitrogen load in each tank of anaerobic tank 12 and aerobic tanks 13a-13c inputted from load detection parts 19a-19d, and ammonia nitrogen load in each tank The raw water is supplied to each tank by controlling the opening degree of the valves 22a to 22d so that becomes less than a predetermined value. For example, when the value of the ammonia nitrogen load detected by the load detector 19d is greater than or equal to a predetermined value, the inflow nitrogen load control device 21 supplies raw water into the aerobic tank 13c by opening the valve 22d. The amount of nitrous oxide gas generated in the aerobic tanks 13a to 13c increases as the ammoniacal nitrogen load increases. Therefore, by supplying raw water to the aerobic tanks 13a to 13c according to the value of the ammonia nitrogen load in this way, the value of the ammonia nitrogen load in the aerobic tanks 13a to 13c is kept below a predetermined value, and the atmosphere Release of nitrous oxide gas into the inside can be suppressed.

〔第２の実施形態〕
次に、図２を参照して、本発明の第２の実施形態である下水処理システムの構成について説明する。 [Second Embodiment]
Next, with reference to FIG. 2, the structure of the sewage treatment system which is the 2nd Embodiment of this invention is demonstrated.

図２は、本発明の第２の実施形態である下水処理システムの構成を示す模式図である。図２に示すように、本発明の第２の実施形態である下水処理システム２は、嫌気槽１１と、無酸素槽１２と、複数の好気槽１３ａ〜１３ｃと、沈殿槽１４と、汚泥返送路１５と、硝化液循環路１６と、を備える。なお、これらの構成要素は、第１の実施形態である下水処理システム１における構成要素と同じであるので、以下ではその説明を省略する。   FIG. 2 is a schematic diagram showing a configuration of a sewage treatment system according to a second embodiment of the present invention. As shown in FIG. 2, the sewage treatment system 2 which is the 2nd Embodiment of this invention is the anaerobic tank 11, the anoxic tank 12, several aerobic tanks 13a-13c, the sedimentation tank 14, and sludge. A return path 15 and a nitrating liquid circulation path 16 are provided. In addition, since these components are the same as the components in the sewage treatment system 1 which is 1st Embodiment, the description is abbreviate | omitted below.

本発明の第２の実施形態である下水処理システム２には、大気中への亜酸化窒素ガスの放出を抑制するために、滞留時間制御装置３１が設けられている。滞留時間制御装置３１は、ワークステーションやパーソナルコンピュータなどの情報処理装置によって構成されている。滞留時間制御装置３１は、例えば沈殿槽１４から汚泥返送路１５への活性汚泥１８の引き抜き回数や引き抜き量を制御することによって、沈殿槽１４内における活性汚泥１８の滞留時間を制御する。活性汚泥１８内に含まれる亜酸化窒素ガスは、沈殿槽１４内に滞留している間に活性汚泥１８内で分解されていく。従って、活性汚泥１８を速やかに汚泥返送路１５へと引き抜くのではなく、所定時間以上滞留させるように活性汚泥１８の滞留時間を制御することによって、大気中への亜酸化窒素ガスの放出を抑制することができる。   The sewage treatment system 2 according to the second embodiment of the present invention is provided with a residence time control device 31 in order to suppress the release of nitrous oxide gas into the atmosphere. The residence time control device 31 is configured by an information processing device such as a workstation or a personal computer. The residence time control device 31 controls the residence time of the activated sludge 18 in the sedimentation tank 14 by controlling, for example, the number of withdrawals and the withdrawal amount of the activated sludge 18 from the sedimentation tank 14 to the sludge return path 15. The nitrous oxide gas contained in the activated sludge 18 is decomposed in the activated sludge 18 while staying in the settling tank 14. Therefore, the activated sludge 18 is not pulled out to the sludge return path 15 immediately, but the residence time of the activated sludge 18 is controlled so as to stay for a predetermined time or more, thereby suppressing the release of nitrous oxide gas into the atmosphere. can do.

〔第３の実施形態〕
最後に、図３を参照して、本発明の第３の実施形態である下水処理システムの構成について説明する。 [Third Embodiment]
Finally, with reference to FIG. 3, the structure of the sewage treatment system which is the 3rd Embodiment of this invention is demonstrated.

図３は、本発明の第３の実施形態である下水処理システムの構成を示す模式図である。図３に示すように、本発明の第３の実施形態である下水処理システム３は、嫌気槽１１と、無酸素槽１２と、複数の好気槽１３ａ〜１３ｃと、沈殿槽１４と、汚泥返送路１５と、硝化液循環路１６と、を備える。なお、これらの構成要素は、第１及び第２の実施形態である下水処理システム１，２における構成要素と同じであるので、以下ではその説明を省略する。   FIG. 3 is a schematic diagram showing a configuration of a sewage treatment system according to the third embodiment of the present invention. As shown in FIG. 3, the sewage treatment system 3 which is the 3rd Embodiment of this invention is the anaerobic tank 11, the anaerobic tank 12, several aerobic tanks 13a-13c, the sedimentation tank 14, and sludge. A return path 15 and a nitrating liquid circulation path 16 are provided. In addition, since these components are the same as the components in the sewage treatment systems 1 and 2 which are 1st and 2nd embodiment, the description is abbreviate | omitted below.

本発明の第３の実施形態である下水処理システム３には、大気中への亜酸化窒素ガスの放出を抑制するために、ガス検出部４１ａ〜４１ｃと、ガス供給路４２と、ガス送り制御装置４３と、が設けられている。   In the sewage treatment system 3 according to the third embodiment of the present invention, in order to suppress the release of nitrous oxide gas into the atmosphere, gas detectors 41a to 41c, a gas supply path 42, and a gas feed control And a device 43.

ガス検出部４１ａ〜４１ｃはそれぞれ、好気槽１３ａ〜１３ｃに設けられている。ガス検出部４１ａ〜４１ｃは、亜酸化窒素ガスセンサによって構成され、各好気槽内における亜酸化窒素ガスの発生量を検出する。ガス検出部４１ａ〜４１ｃは、検出された亜酸化窒素ガスの発生量の値をガス送り制御装置４３に入力する。   The gas detection parts 41a-41c are provided in the aerobic tanks 13a-13c, respectively. The gas detection parts 41a-41c are comprised by the nitrous oxide gas sensor, and detect the generation amount of the nitrous oxide gas in each aerobic tank. The gas detection units 41 a to 41 c input the detected value of the generated amount of nitrous oxide gas to the gas feed control device 43.

ガス供給路４２は、好気槽１３ａ〜１３ｃ内で発生した亜酸化窒素ガスを無酸素槽１２に供給するための配管である。各好気槽から無酸素槽１２への亜酸化窒素ガスの供給量はそれぞれ、バルブ４４ａ〜４４ｃの開度を制御することによって調整される。   The gas supply path 42 is a pipe for supplying nitrous oxide gas generated in the aerobic tanks 13 a to 13 c to the anoxic tank 12. The amount of nitrous oxide gas supplied from each aerobic tank to the oxygen-free tank 12 is adjusted by controlling the opening degree of the valves 44a to 44c.

ガス送り制御装置４３は、ワークステーションやパーソナルコンピュータなどの情報処理装置によって構成されている。ガス送り制御装置４３は、ガス検出部４１ａ〜４１ｃから入力された好気槽１３ａ〜１３ｃ内における亜酸化窒素ガスの発生量の値に基づいて、好気槽１３ａ〜１３ｃ内における亜酸化窒素ガスの発生量の値が所定値未満になるようにバルブ４４ａ〜４４ｃの開度を制御して好気槽１３ａ〜１３ｃ内の亜酸化窒素ガスを無酸素槽１２に供給する。例えば、ガス検出部４１ｃによって検出された亜酸化窒素ガスの発生量の値が所定値以上である場合、ガス送り制御装置４３は、バルブ４４ｃを開くことによって好気槽１３ｃ内の亜酸化窒素ガスを無酸素槽１２に供給する。無酸素槽１２に供給された亜酸化窒素ガスは、脱窒処理によって無酸素槽１２内で分解処理される。従って、このように亜酸化窒素ガスの発生量に応じて好気槽１３ａ〜１３ｃ内の亜酸化窒素ガスを無酸素槽１２に供給することにより、大気中への亜酸化窒素ガスの放出を抑制することができる。   The gas feed control device 43 is configured by an information processing device such as a workstation or a personal computer. The gas feed control device 43 is based on the value of the amount of nitrous oxide gas generated in the aerobic tanks 13a to 13c input from the gas detectors 41a to 41c, and the nitrous oxide gas in the aerobic tanks 13a to 13c. The nitrous oxide gas in the aerobic tanks 13a to 13c is supplied to the anaerobic tank 12 by controlling the openings of the valves 44a to 44c so that the value of the generated amount is less than a predetermined value. For example, when the value of the generated amount of nitrous oxide gas detected by the gas detection unit 41c is equal to or greater than a predetermined value, the gas feed control device 43 opens the valve 44c, thereby nitrous oxide gas in the aerobic tank 13c. Is supplied to the anoxic tank 12. The nitrous oxide gas supplied to the oxygen-free tank 12 is decomposed in the oxygen-free tank 12 by denitrification. Therefore, by supplying the nitrous oxide gas in the aerobic tanks 13a to 13c to the anaerobic tank 12 in accordance with the generation amount of the nitrous oxide gas in this way, the release of the nitrous oxide gas into the atmosphere is suppressed. can do.

以上、本発明者によってなされた発明を適用した実施の形態について説明したが、本実施形態による本発明の開示の一部をなす記述及び図面により本発明は限定されることはない。例えば、第１乃至第３の実施形態である下水処理システムのうちの２つ以上を組み合わせて下水処理システムを構築してもよい。また、本実施形態は、Ａ２Ｏ法を利用した下水処理システムに本発明を適用したものであるが、本発明は好気処理のみを行う標準法を利用した下水処理システムにも適用することができる。   Although the embodiment to which the invention made by the present inventor is applied has been described above, the present invention is not limited by the description and the drawings that form a part of the disclosure of the present invention according to this embodiment. For example, a sewage treatment system may be constructed by combining two or more of the sewage treatment systems according to the first to third embodiments. Moreover, although this embodiment applies this invention to the sewage treatment system using an A2O method, this invention is applicable also to the sewage treatment system using the standard method which performs only an aerobic treatment. .

すなわち、図４に示すように処理原水の流れ方向に沿って直列に配列された複数の好気槽１３ａ〜１３ｅを備える下水処理システムにおいて、２段目以後の好気槽１３ｂ〜１３ｅに対して負荷検出部１９ａ〜１９ｄ及びバルブ２２ａ〜２２ｄを設け、流入窒素負荷制御装置２１が、負荷検出部１９ａ〜１９ｄから入力された好気槽１３ｂ〜１３ｅの各槽におけるアンモニア性窒素負荷の値に基づいて、各槽におけるアンモニア性窒素負荷が所定値未満になるようにバルブ２２ａ〜２２ｄの開度を制御して各槽に原水を供給するようにしてもよい。   That is, as shown in FIG. 4, in the sewage treatment system including a plurality of aerobic tanks 13a to 13e arranged in series along the flow direction of the treated raw water, the aerobic tanks 13b to 13e after the second stage are used. Load detectors 19a to 19d and valves 22a to 22d are provided, and the inflow nitrogen load control device 21 is based on the value of ammonia nitrogen load in each of the aerobic tanks 13b to 13e input from the load detectors 19a to 19d. In addition, the opening of the valves 22a to 22d may be controlled so that the ammonia nitrogen load in each tank is less than a predetermined value, and raw water may be supplied to each tank.

また、図５に示すように処理原水の流れ方向に沿って直列に配列された複数の好気槽１３ａ〜１３ｅを備える下水処理システムにおいて、滞留時間制御装置３１が、例えば沈殿槽１４から汚泥返送路１５への活性汚泥１８の引き抜き回数や引き抜き量を制御することによって、沈殿槽１４内における活性汚泥１８の滞留時間を制御するようにしてもよい。   Further, in the sewage treatment system including a plurality of aerobic tanks 13a to 13e arranged in series along the flow direction of the treated raw water as shown in FIG. 5, the residence time control device 31 returns sludge from the settling tank 14, for example. You may make it control the residence time of the activated sludge 18 in the sedimentation tank 14 by controlling the frequency | count of extraction and the amount of extraction of the activated sludge 18 to the path 15. FIG.

また、図６に示すように処理原水の流れ方向に沿って直列に配列された複数の好気槽１３ａ〜１３ｅを備える下水処理システムにおいて、２段目以後の好気槽１３ｂ〜１３ｅに対してガス検出部４１ａ〜４１ｄ及びバルブ４４ａ〜４４ｄを設け、ガス送り制御装置４３が、ガス検出部４１ａ〜４１ｄから入力された好気槽１３ｂ〜１３ｅ内における亜酸化窒素ガスの発生量の値に基づいて、好気槽１３ｂ〜１３ｅ内における亜酸化窒素ガスの発生量の値が所定値未満になるようにバルブ４４ａ〜４４ｄの開度を制御して好気槽１３ｂ〜１３ｅ内の亜酸化窒素ガスを好気槽１３ａに供給するようにしてもよい。   Moreover, in the sewage treatment system provided with the several aerobic tanks 13a-13e arranged in series along the flow direction of process raw | natural water as shown in FIG. 6, with respect to the aerobic tanks 13b-13e after the 2nd step | paragraph. Gas detectors 41a to 41d and valves 44a to 44d are provided, and the gas feed controller 43 is based on the value of the amount of nitrous oxide gas generated in the aerobic tanks 13b to 13e input from the gas detectors 41a to 41d. The nitrous oxide gas in the aerobic tanks 13b to 13e is controlled by controlling the opening of the valves 44a to 44d so that the value of the generated amount of nitrous oxide gas in the aerobic tanks 13b to 13e is less than a predetermined value. May be supplied to the aerobic tank 13a.

このように、本実施形態に基づいて当業者などによりなされる他の実施の形態、実施例及び運用技術などは全て本発明の範疇に含まれる。   As described above, other embodiments, examples, operation techniques, and the like made by those skilled in the art based on the present embodiment are all included in the scope of the present invention.

１，２，３ 下水処理システム
１１ 嫌気槽
１２ 無酸素槽
１３ａ〜１３ｃ 好気槽
１４ 沈殿槽
１５ 汚泥返送路
１６ 硝化液循環路
１７ 原水供給路
１８ 活性汚泥
１９ａ〜１９ｄ 負荷検出部
２０ 原水ステップ流路
２１ 流入窒素負荷制御装置
２２ａ〜２２ｄ，４４ａ〜４４ｃ バルブ
３１ 滞留時間制御装置
４１ａ〜４１ｃ ガス検出部
４２ ガス供給路
４３ ガス送り制御装置 1, 2, 3 Sewage treatment system 11 Anaerobic tank 12 Anoxic tank 13a-13c Aerobic tank 14 Sedimentation tank 15 Sludge return path 16 Nitrification liquid circulation path 17 Raw water supply path 18 Activated sludge 19a-19d Load detection part 20 Raw water step flow Path 21 Inflow nitrogen load control device 22a-22d, 44a-44c Valve 31 Residence time control device 41a-41c Gas detection part 42 Gas supply path 43 Gas feed control device

Claims (8)

原水供給路から供給された原水が流入する、嫌気条件下で該原水中に含まれる有機物を活性汚泥に取り込むと共に該活性汚泥中に含まれるリンを該原水に放出する嫌気槽と、
前記嫌気槽から流出した処理原水が流入する、無酸素条件下で該処理原水中に含まれる亜硝酸性窒素及び硝酸性窒素を窒素ガスに還元する無酸素槽と、
前記無酸素槽から流出した処理原水が流入する、好気条件下で該処理原水中に含まれるアンモニア性窒素を亜硝酸性窒素及び硝酸性窒素に硝化すると共に該処理原水中に含まれるリンを活性汚泥中に取り込む、該処理原水の流れ方向に沿って配列された複数の好気槽と、
前記好気槽から流出した処理原水が流入する、該処理原水に含まれる活性汚泥を沈殿させる沈殿槽と、
前記沈殿槽内に堆積する活性汚泥を前記嫌気槽に返送する汚泥返送路と、
最下流の前記好気槽内の硝化液を前記無酸素槽に循環する硝化液循環路と、
前記複数の好気槽に各槽におけるアンモニア性窒素負荷を検出する負荷検出部と、
前記窒素負荷検出部の検出結果に基づいて、前記原水供給路から供給された原水の一部を前記複数の好気槽及び前記無酸素槽に分配供給する原水ステップ流路と、
を備えることを特徴とする下水処理システム。 An anaerobic tank into which raw water supplied from the raw water supply channel flows, takes in organic matter contained in the raw water under anaerobic conditions into the activated sludge, and releases phosphorus contained in the activated sludge to the raw water;
An anaerobic tank for reducing the nitrite nitrogen and nitrate nitrogen contained in the treated raw water to an oxygen gas under anaerobic conditions into which the treated raw water flowing out of the anaerobic tank flows;
Nitrogenous nitrogen contained in the treated raw water is nitrified to nitrite nitrogen and nitrate nitrogen under aerobic conditions into which the treated raw water that has flowed out of the oxygen-free tank flows, and phosphorus contained in the treated raw water. A plurality of aerobic tanks arranged along the flow direction of the treated raw water to be taken into the activated sludge;
A settling tank for precipitating activated sludge contained in the treated raw water into which the treated raw water flowing out of the aerobic tank flows;
A sludge return path for returning activated sludge accumulated in the settling tank to the anaerobic tank;
A nitrification liquid circulation path for circulating the nitrification liquid in the aerobic tank at the most downstream to the anoxic tank;
A load detector for detecting an ammoniacal nitrogen load in each tank in the plurality of aerobic tanks;
Based on the detection result of the nitrogen load detection unit, a raw water step flow path that distributes and supplies a part of the raw water supplied from the raw water supply path to the plurality of aerobic tanks and the oxygen-free tank,
A sewage treatment system comprising: 原水供給路から供給された原水が流入する、嫌気条件下で該原水中に含まれる有機物を活性汚泥に取り込むと共に該活性汚泥中に含まれるリンを該原水に放出する嫌気槽と、
前記嫌気槽から流出した処理原水が流入する、無酸素条件下で該処理原水中に含まれる亜硝酸性窒素及び硝酸性窒素を窒素ガスに還元する無酸素槽と、
前記無酸素槽から流出した処理原水が流入する、好気条件下で該処理原水中に含まれるアンモニア性窒素を亜硝酸性窒素及び硝酸性窒素に硝化すると共に該処理原水中に含まれるリンを活性汚泥中に取り込む、該処理原水の流れ方向に沿って配列された複数の好気槽と、
前記好気槽から流出した処理原水が流入する、該処理原水に含まれる活性汚泥を沈殿させる沈殿槽と、
前記沈殿槽内に堆積する活性汚泥を前記嫌気槽に返送する汚泥返送路と、
最下流の前記好気槽内の硝化液を前記無酸素槽に循環する硝化液循環路と、
前記沈殿槽内における前記活性汚泥の滞留時間を制御する滞留時間制御部と、
を備えることを特徴とする下水処理システム。 An anaerobic tank into which raw water supplied from the raw water supply channel flows, takes in organic matter contained in the raw water under anaerobic conditions into the activated sludge, and releases phosphorus contained in the activated sludge to the raw water;
An anaerobic tank for reducing the nitrite nitrogen and nitrate nitrogen contained in the treated raw water to an oxygen gas under anaerobic conditions into which the treated raw water flowing out of the anaerobic tank flows;
Nitrogenous nitrogen contained in the treated raw water is nitrified to nitrite nitrogen and nitrate nitrogen under aerobic conditions into which the treated raw water that has flowed out of the oxygen-free tank flows, and phosphorus contained in the treated raw water. A plurality of aerobic tanks arranged along the flow direction of the treated raw water to be taken into the activated sludge;
A settling tank for precipitating activated sludge contained in the treated raw water into which the treated raw water flowing out of the aerobic tank flows;
A sludge return path for returning activated sludge accumulated in the settling tank to the anaerobic tank;
A nitrification liquid circulation path for circulating the nitrification liquid in the aerobic tank at the most downstream to the anoxic tank;
A residence time control unit for controlling the residence time of the activated sludge in the settling tank;
A sewage treatment system comprising: 原水供給路から供給された原水が流入する、嫌気条件下で該原水中に含まれる有機物を活性汚泥に取り込むと共に該活性汚泥中に含まれるリンを該原水に放出する嫌気槽と、
前記嫌気槽から流出した処理原水が流入する、無酸素条件下で該処理原水中に含まれる亜硝酸性窒素及び硝酸性窒素を窒素ガスに還元する無酸素槽と、
前記無酸素槽から流出した処理原水が流入する、好気条件下で該処理原水中に含まれるアンモニア性窒素を亜硝酸性窒素及び硝酸性窒素に硝化すると共に該処理原水中に含まれるリンを活性汚泥中に取り込む、該処理原水の流れ方向に沿って配列された複数の好気槽と、
前記好気槽から流出した処理原水が流入する、該処理原水に含まれる活性汚泥を沈殿させる沈殿槽と、
前記沈殿槽内に堆積する活性汚泥を前記嫌気槽に返送する汚泥返送路と、
最下流の前記好気槽内の硝化液を前記無酸素槽に循環する硝化液循環路と、
前記複数の好気槽内で発生した亜酸化窒素ガスの濃度を検出する濃度検出部と、
前記濃度検出部の検出結果に基づいて、前記複数の好気槽内に存在する前記亜酸化窒素ガスを含有する含有ガスを前記無酸素槽に供給するガス供給路と、
を備えることを特徴とする下水処理システム。 An anaerobic tank into which raw water supplied from the raw water supply channel flows, takes in organic matter contained in the raw water under anaerobic conditions into the activated sludge, and releases phosphorus contained in the activated sludge to the raw water;
An anaerobic tank for reducing the nitrite nitrogen and nitrate nitrogen contained in the treated raw water to an oxygen gas under anaerobic conditions into which the treated raw water flowing out of the anaerobic tank flows;
Nitrogenous nitrogen contained in the treated raw water is nitrified to nitrite nitrogen and nitrate nitrogen under aerobic conditions into which the treated raw water that has flowed out of the oxygen-free tank flows, and phosphorus contained in the treated raw water. A plurality of aerobic tanks arranged along the flow direction of the treated raw water to be taken into the activated sludge;
A settling tank for precipitating activated sludge contained in the treated raw water into which the treated raw water flowing out of the aerobic tank flows;
A sludge return path for returning activated sludge accumulated in the settling tank to the anaerobic tank;
A nitrification liquid circulation path for circulating the nitrification liquid in the aerobic tank at the most downstream to the anoxic tank;
A concentration detector for detecting the concentration of nitrous oxide gas generated in the plurality of aerobic tanks;
Based on the detection result of the concentration detector, a gas supply path for supplying the oxygen-containing tank with a gas containing the nitrous oxide gas present in the plurality of aerobic tanks;
A sewage treatment system comprising: 原水供給路から供給された原水が流入する、嫌気条件下で該原水中に含まれる有機物を活性汚泥に取り込むと共に該活性汚泥中に含まれるリンを該原水に放出する嫌気槽と、
前記嫌気槽から流出した処理原水が流入する、無酸素条件下で該処理原水中に含まれる亜硝酸性窒素及び硝酸性窒素を窒素ガスに還元する無酸素槽と、
前記無酸素槽から流出した処理原水が流入する、好気条件下で該処理原水中に含まれるアンモニア性窒素を亜硝酸性窒素及び硝酸性窒素に硝化すると共に該処理原水中に含まれるリンを活性汚泥中に取り込む、該処理原水の流れ方向に沿って配列された複数の好気槽と、
前記好気槽から流出した処理原水が流入する、該処理原水に含まれる活性汚泥を沈殿させる沈殿槽と、
前記沈殿槽内に堆積する活性汚泥を前記嫌気槽に返送する汚泥返送路と、
最下流の前記好気槽内の硝化液を前記無酸素槽に循環する硝化液循環路と、
前記複数の好気槽に各槽におけるアンモニア性窒素負荷を検出する負荷検出部と、
前記窒素負荷検出部の検出結果に基づいて、前記原水供給路から供給された原水の一部を前記複数の好気槽及び前記無酸素槽に分配供給する原水ステップ流路と、
前記沈殿槽内における前記活性汚泥の滞留時間を制御する滞留時間制御部と、
前記複数の好気槽内で発生した亜酸化窒素ガスの濃度を検出する濃度検出部と、
前記濃度検出部の検出結果に基づいて、前記複数の好気槽内に存在する前記亜酸化窒素ガスを含有する含有ガスを前記無酸素槽に供給するガス供給路と、
を備えることを特徴とする下水処理システム。 An anaerobic tank into which raw water supplied from the raw water supply channel flows, takes in organic matter contained in the raw water under anaerobic conditions into the activated sludge, and releases phosphorus contained in the activated sludge to the raw water;
An anaerobic tank for reducing the nitrite nitrogen and nitrate nitrogen contained in the treated raw water to an oxygen gas under anaerobic conditions into which the treated raw water flowing out of the anaerobic tank flows;
Nitrogenous nitrogen contained in the treated raw water is nitrified to nitrite nitrogen and nitrate nitrogen under aerobic conditions into which the treated raw water that has flowed out of the oxygen-free tank flows, and phosphorus contained in the treated raw water. A plurality of aerobic tanks arranged along the flow direction of the treated raw water to be taken into the activated sludge;
A settling tank for precipitating activated sludge contained in the treated raw water into which the treated raw water flowing out of the aerobic tank flows;
A sludge return path for returning activated sludge accumulated in the settling tank to the anaerobic tank;
A nitrification liquid circulation path for circulating the nitrification liquid in the aerobic tank at the most downstream to the anoxic tank;
A load detector for detecting an ammoniacal nitrogen load in each tank in the plurality of aerobic tanks;
Based on the detection result of the nitrogen load detection unit, a raw water step flow path that distributes and supplies a part of the raw water supplied from the raw water supply path to the plurality of aerobic tanks and the oxygen-free tank,
A residence time control unit for controlling the residence time of the activated sludge in the settling tank;
A concentration detector for detecting the concentration of nitrous oxide gas generated in the plurality of aerobic tanks;
Based on the detection result of the concentration detector, a gas supply path for supplying the oxygen-containing tank with a gas containing the nitrous oxide gas present in the plurality of aerobic tanks;
A sewage treatment system comprising: 原水供給路から供給された原水が流入する、好気条件下で該処理原水中に含まれるアンモニア性窒素を亜硝酸性窒素及び硝酸性窒素に硝化すると共に該処理原水中に含まれるリンを活性汚泥中に取り込む、該処理原水の流れ方向に沿って配列された複数の好気槽と、
前記好気槽から流出した処理原水が流入する、該処理原水に含まれる活性汚泥を沈殿させる沈殿槽と、
前記沈殿槽内に堆積する活性汚泥を１段目の前記好気槽に返送する汚泥返送路と、
前記複数の好気槽のうち、２段目以後の各好気槽におけるアンモニア性窒素負荷を検出する負荷検出部と、
前記窒素負荷検出部の検出結果に基づいて、前記原水供給路から供給された原水の一部を前記２段目以後の各好気槽に分配供給する原水ステップ流路と、
を備えることを特徴とする下水処理システム。 Nitrogenous nitrogen contained in the treated raw water is nitrified to nitrite nitrogen and nitrate nitrogen under aerobic conditions where raw water supplied from the raw water supply channel flows in and activates phosphorus contained in the treated raw water A plurality of aerobic tanks arranged along the flow direction of the treated raw water to be taken into sludge;
A settling tank for precipitating activated sludge contained in the treated raw water into which the treated raw water flowing out of the aerobic tank flows;
A sludge return path for returning activated sludge accumulated in the settling tank to the first stage aerobic tank;
Among the plurality of aerobic tanks, a load detection unit that detects an ammoniacal nitrogen load in each aerobic tank after the second stage;
Based on the detection result of the nitrogen load detection unit, a raw water step flow path for distributing and supplying a part of the raw water supplied from the raw water supply path to each aerobic tank after the second stage,
A sewage treatment system comprising: 原水供給路から供給された原水が流入する、好気条件下で該処理原水中に含まれるアンモニア性窒素を亜硝酸性窒素及び硝酸性窒素に硝化すると共に該処理原水中に含まれるリンを活性汚泥中に取り込む、該処理原水の流れ方向に沿って配列された複数の好気槽と、
前記好気槽から流出した処理原水が流入する、該処理原水に含まれる活性汚泥を沈殿させる沈殿槽と、
前記沈殿槽内に堆積する活性汚泥を１段目の前記好気槽に返送する汚泥返送路と、
前記沈殿槽内における前記活性汚泥の滞留時間を制御する滞留時間制御部と、
を備えることを特徴とする下水処理システム。 Nitrogenous nitrogen contained in the treated raw water is nitrified to nitrite nitrogen and nitrate nitrogen under aerobic conditions where raw water supplied from the raw water supply channel flows in and activates phosphorus contained in the treated raw water A plurality of aerobic tanks arranged along the flow direction of the treated raw water to be taken into sludge;
A settling tank for precipitating activated sludge contained in the treated raw water into which the treated raw water flowing out of the aerobic tank flows;
A sludge return path for returning activated sludge accumulated in the settling tank to the first stage aerobic tank;
A residence time control unit for controlling the residence time of the activated sludge in the settling tank;
A sewage treatment system comprising: 原水供給路から供給された原水が流入する、好気条件下で該処理原水中に含まれるアンモニア性窒素を亜硝酸性窒素及び硝酸性窒素に硝化すると共に該処理原水中に含まれるリンを活性汚泥中に取り込む、該処理原水の流れ方向に沿って配列された複数の好気槽と、
前記好気槽から流出した処理原水が流入する、該処理原水に含まれる活性汚泥を沈殿させる沈殿槽と、
前記沈殿槽内に堆積する活性汚泥を１段目の前記好気槽に返送する汚泥返送路と、
前記複数の好気槽のうち、２段目以後の各好気槽内で発生した亜酸化窒素ガスの濃度を検出する濃度検出部と、
前記濃度検出部の検出結果に基づいて、２段目以後の各好気槽内に存在する前記亜酸化窒素ガスを含有する含有ガスを１段目の前記好気槽に供給するガス供給路と、
を備えることを特徴とする下水処理システム。 Nitrogenous nitrogen contained in the treated raw water is nitrified to nitrite nitrogen and nitrate nitrogen under aerobic conditions where raw water supplied from the raw water supply channel flows in and activates phosphorus contained in the treated raw water A plurality of aerobic tanks arranged along the flow direction of the treated raw water to be taken into sludge;
A settling tank for precipitating activated sludge contained in the treated raw water into which the treated raw water flowing out of the aerobic tank flows;
A sludge return path for returning activated sludge accumulated in the settling tank to the first stage aerobic tank;
A concentration detector for detecting the concentration of nitrous oxide gas generated in each aerobic tank after the second stage among the plurality of aerobic tanks;
A gas supply path for supplying a gas containing the nitrous oxide gas present in each aerobic tank after the second stage to the first aerobic tank based on the detection result of the concentration detection unit; ,
A sewage treatment system comprising: 原水供給路から供給された原水が流入する、好気条件下で該処理原水中に含まれるアンモニア性窒素を亜硝酸性窒素及び硝酸性窒素に硝化すると共に該処理原水中に含まれるリンを活性汚泥中に取り込む、該処理原水の流れ方向に沿って配列された複数の好気槽と、
前記好気槽から流出した処理原水が流入する、該処理原水に含まれる活性汚泥を沈殿させる沈殿槽と、
前記沈殿槽内に堆積する活性汚泥を１段目の前記好気槽に返送する汚泥返送路と、
前記複数の好気槽のうち、２段目以後の各好気槽におけるアンモニア性窒素負荷を検出する負荷検出部と、
前記窒素負荷検出部の検出結果に基づいて、前記原水供給路から供給された原水の一部を前記２段目以後の各好気槽に分配供給する原水ステップ流路と、
前記沈殿槽内における前記活性汚泥の滞留時間を制御する滞留時間制御部と、
前記複数の好気槽のうち、２段目以後の各好気槽内で発生した亜酸化窒素ガスの濃度を検出する濃度検出部と、
前記濃度検出部の検出結果に基づいて、２段目以後の各好気槽内に存在する前記亜酸化窒素ガスを含有する含有ガスを１段目の前記好気槽に供給するガス供給路と、
を備えることを特徴とする下水処理システム。 Nitrogenous nitrogen contained in the treated raw water is nitrified to nitrite nitrogen and nitrate nitrogen under aerobic conditions where raw water supplied from the raw water supply channel flows in and activates phosphorus contained in the treated raw water A plurality of aerobic tanks arranged along the flow direction of the treated raw water to be taken into sludge;
A settling tank for precipitating activated sludge contained in the treated raw water into which the treated raw water flowing out of the aerobic tank flows;
A sludge return path for returning activated sludge accumulated in the settling tank to the first stage aerobic tank;
Among the plurality of aerobic tanks, a load detection unit that detects an ammoniacal nitrogen load in each aerobic tank after the second stage;
Based on the detection result of the nitrogen load detection unit, a raw water step flow path for distributing and supplying a part of the raw water supplied from the raw water supply path to each aerobic tank after the second stage,
A residence time control unit for controlling the residence time of the activated sludge in the settling tank;
A concentration detector for detecting the concentration of nitrous oxide gas generated in each aerobic tank after the second stage among the plurality of aerobic tanks;
A gas supply path for supplying a gas containing the nitrous oxide gas present in each aerobic tank after the second stage to the first aerobic tank based on the detection result of the concentration detection unit; ,
A sewage treatment system comprising:
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CN109205779A (en) * 2017-06-30 2019-01-15 广东德嘉电力环保科技有限公司 A kind of Changeful type sewage disposal system
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