JP2012245457A - Sewage treatment method and sewage treatment apparatus - Google Patents

Sewage treatment method and sewage treatment apparatus Download PDF

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JP2012245457A
JP2012245457A JP2011118281A JP2011118281A JP2012245457A JP 2012245457 A JP2012245457 A JP 2012245457A JP 2011118281 A JP2011118281 A JP 2011118281A JP 2011118281 A JP2011118281 A JP 2011118281A JP 2012245457 A JP2012245457 A JP 2012245457A
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sewage
activated sludge
biological reaction
reaction tank
mixed liquid
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JP5876671B2 (en
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Yuji Furuya
勇治 古屋
norihide Nakata
典秀 中田
Hiroaki Tanaka
宏明 田中
Naoyuki Yamashita
尚之 山下
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Kyoto University
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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Abstract

PROBLEM TO BE SOLVED: To efficiently treat sewage even when sewage inflow volume exceeds planned maximum inflow volume.SOLUTION: In a sewage treatment method, when the sewage inflow volume exceeds the planned maximum inflow volume, activated sludge mixed liquid in a biological reaction vessel 1 is supplied to an activated sludge concentration device 3 by adjusting the opening degree of an opening/closing valve B arranged in a flow channel L5 by means of a control device 4 to reduce the water levels of the activated sludge mixed liquid in the biological reaction vessel 1 and a final settling basin 2 to predetermined values or less. Consequently even when the sewage inflow volume exceeds the planned maximum inflow volume, sewage can be efficiently treated.

Description

本発明は、生物反応を用いて下水を処理する下水処理方法及び下水処理装置に関するものである。   The present invention relates to a sewage treatment method and a sewage treatment apparatus for treating sewage using a biological reaction.

一般に、雨水と汚水とが合流する合流式下水道においては（特許文献１参照）、下水流入量が計画最大流入量に対して一定割合を超過しない場合、流入下水の全量に対し、最初沈殿池，生物反応槽，及び最終沈殿池での沈澱及び生物による二次処理まで行った後、消毒槽にて消毒を行い公共用水域へと放流している。一方、雨天時の増水等によって下水流入量が計画最大流入量に対して一定の割合を超過する場合には、超過量以下の流入下水については二次処理まで行い放流し、超過量以上の流入下水については最初沈殿池で一次処理した後に消毒槽にて消毒する。さらに流入水量が増加した場合は、最初沈殿池を通さずにきょう雑物を除去した後に消毒槽へ流入させて消毒のみを行い、放流する。   In general, in a combined sewer where rainwater and sewage merge (see Patent Document 1), if the sewage inflow does not exceed a certain percentage of the planned maximum inflow, After carrying out the sedimentation in the biological reaction tank and the final sedimentation basin and the secondary treatment by the organism, it is sterilized in the disinfection tank and discharged to the public water area. On the other hand, if the inflow of sewage exceeds a certain percentage of the planned maximum inflow due to increased water during rainy weather, the inflow sewage below the excess will be discharged up to the secondary treatment, and the inflow exceeding the excess will be discharged. Sewage is first treated in the sedimentation basin and then disinfected in the disinfection tank. If the amount of inflow water further increases, remove the impurities without first passing through the settling basin, then flow into the disinfection tank, disinfect only, and discharge.

特開２００５−２１８９９１号公報JP 2005-218991 A

しかしながら、従来の下水処理方法では、雨天時には流入下水の水質によっては有機物，生物化学的酸素要求量（Biochemical Oxide Demand：BOD），窒素分等が放流水質基準値を超過することがあり、河川や海等に放流することによって、放流先の水質に影響が生じるおそれがあった。このような問題を解決するために、雨水貯留管や雨水貯留槽等の雨水貯留設備を設置し、下水流入量が計画最大流入量を超過する場合に一時的に雨水を貯留し、晴天時に雨水貯留設備内に貯留されている雨水の全量を生物反応槽において処理する方法が考えられている。しかしながら、このような方法では、雨水貯留設備の建設のために多額の費用を要する上に雨水貯留設備の稼働率が低いために、コスト面に問題がある。   However, in conventional sewage treatment methods, in rainy weather, organic matter, biochemical oxygen demand (BOD), nitrogen content, etc. may exceed the effluent quality standards depending on the quality of the influent sewage. There was a possibility that the water quality of the discharge destination might be affected by discharging it to the sea. In order to solve such problems, rainwater storage facilities such as rainwater storage pipes and rainwater storage tanks are installed, and rainwater is temporarily stored when the sewage inflow exceeds the planned maximum inflow. A method of treating the entire amount of rainwater stored in a storage facility in a biological reaction tank has been considered. However, such a method has a problem in cost because it requires a large amount of money for the construction of the rainwater storage facility and the operation rate of the rainwater storage facility is low.

一方、生物反応槽では、設備の老朽化に伴い散気装置の改造等の補修作業を行う必要があり、補修作業を行う場合には、一時的に１池や１系列の生物反応槽を停止することがあり、その間、他の池では計画最大流入量以上の下水を処理する必要がある。このため、下水流入量が計画最大流入量を超過しないように、補修作業は年間を通じて下水の水量が比較的少ない冬季等に実施され、特に合流式下水道からの下水を処理する処理場では補修時期が限定されてしまう。このような背景から、雨天時の増水や生物反応槽の補修等によって下水流入量が計画最大流入量を超過する場合であっても下水を効率的に処理可能な技術の提供が期待されていた。   On the other hand, in the biological reaction tank, it is necessary to perform repair work such as remodeling of the diffuser as the equipment ages. When repair work is performed, one pond or one series of biological reaction tanks is temporarily stopped. In the meantime, other ponds need to treat more than the planned maximum inflow. For this reason, in order to prevent the sewage inflow from exceeding the planned maximum inflow, repair work is carried out in winter when the amount of sewage is relatively low throughout the year, especially at the treatment plant that treats sewage from the combined sewerage system. Will be limited. Against this background, the provision of technology capable of efficiently treating sewage was expected even when the sewage inflow exceeded the planned maximum inflow by increasing water during rainy weather or repairing the biological reaction tank. .

本発明は、上記課題を鑑みてなされたものであって、その目的は、下水流入量が計画最大流入量を超過する場合であっても下水を効率的に処理可能な下水処理方法及び下水処理装置を提供することにある。   The present invention has been made in view of the above problems, and an object of the present invention is to provide a sewage treatment method and sewage treatment capable of efficiently treating sewage even when the sewage inflow exceeds the planned maximum inflow. To provide an apparatus.

上記課題を解決し、目的を達成するために、本発明に係る下水処理方法は、下水流入量が計画最大流入量を超過するか否かを判別する判別ステップと、前記判別ステップにおいて下水流入量が計画最大流入量を超過すると判別された場合、活性汚泥混合液を分離液と活性汚泥濃縮液とに濃縮分離する濃縮装置に生物反応槽内の活性汚泥混合液を供給することによって、前記生物反応槽内の活性汚泥混合液の水位を所定値以下に低下させるステップとを含む。   In order to solve the above problems and achieve the object, a sewage treatment method according to the present invention includes a determination step of determining whether or not a sewage inflow amount exceeds a planned maximum inflow amount, and a sewage inflow amount in the determination step. If the activated sludge mixture is determined to exceed the planned maximum inflow, the activated sludge mixed liquid in the biological reaction tank is supplied to a concentrating device that concentrates and separates the activated sludge mixed liquid into a separated liquid and an activated sludge concentrated liquid. Reducing the water level of the activated sludge mixed liquid in the reaction tank to a predetermined value or less.

上記課題を解決し、目的を達成するために、本発明に係る下水処理装置は、下水流入量が計画最大流入量を超過するか否かを判別する判別手段と、前記判別手段によって下水流入量が計画最大流入量を超過すると判別された場合、活性汚泥混合液を分離液と活性汚泥濃縮液とに濃縮分離する濃縮装置に生物反応槽内の活性汚泥混合液を供給することによって、前記生物反応槽内の活性汚泥混合液の水位を所定値以下に低下させる制御手段と、を備える。   In order to solve the above-described problems and achieve the object, a sewage treatment apparatus according to the present invention includes a determination unit that determines whether or not a sewage inflow amount exceeds a planned maximum inflow amount, and a sewage inflow amount by the determination unit. If the activated sludge mixture is determined to exceed the planned maximum inflow, the activated sludge mixed liquid in the biological reaction tank is supplied to a concentrating device that concentrates and separates the activated sludge mixed liquid into a separated liquid and an activated sludge concentrated liquid. Control means for lowering the water level of the activated sludge mixed liquid in the reaction tank to a predetermined value or less.

本発明に係る下水処理方法及び下水処理装置によれば、下水流入量が計画最大流入量を超過する場合であっても、生物反応槽内の活性汚泥混合液の水位が所定値以下に制御されているので、下水を効率的に処理することができる。   According to the sewage treatment method and the sewage treatment apparatus according to the present invention, even if the sewage inflow amount exceeds the planned maximum inflow amount, the water level of the activated sludge mixed liquid in the biological reaction tank is controlled to a predetermined value or less. Therefore, sewage can be treated efficiently.

図１は、本発明の一実施形態である下水処理装置の構成を示す模式図である。FIG. 1 is a schematic diagram showing a configuration of a sewage treatment apparatus according to an embodiment of the present invention.

以下、図面を参照して、本発明の一実施形態である下水処理システムの構成及びその動作について説明する。   Hereinafter, the configuration and operation of a sewage treatment system according to an embodiment of the present invention will be described with reference to the drawings.

〔下水処理装置の構成〕
図１は、本発明の一実施形態である下水処理装置の構成を示す模式図である。図１に示すように、本発明の一実施形態である下水処理装置は、生物反応槽１と、最終沈殿池２と、活性汚泥濃縮装置３と、制御装置４とを主な構成要素として備えている。 [Configuration of sewage treatment equipment]
FIG. 1 is a schematic diagram showing a configuration of a sewage treatment apparatus according to an embodiment of the present invention. As shown in FIG. 1, the sewage treatment apparatus according to one embodiment of the present invention includes a biological reaction tank 1, a final sedimentation basin 2, an activated sludge concentration apparatus 3, and a control apparatus 4 as main components. ing.

生物反応槽１は、槽内に滞留する活性汚泥に含まれる微生物の作用によって下水を脱窒処理、脱リン処理するものである。生物反応槽１としては、アンモニア酸化菌や亜硝酸酸化菌等の好気性微生物を含む曝気槽、亜硝酸酸化菌等の好気性微生物と脱窒菌等の嫌気性微生物とを含む間欠曝気槽等を用いることができる。生物反応槽１には、図示しない最初沈殿池等の下水供給源から伸びた流路Ｌ１と、最終沈殿池２から伸びた流路Ｌ２と、活性汚泥濃縮装置３から伸びた流路Ｌ３とが接続されている。生物反応槽１には、流路Ｌ４を介して最終沈殿池２が接続されている。生物反応槽１には、流路Ｌ５を介して活性汚泥濃縮装置３が接続されている。   The biological reaction tank 1 is for denitrifying and dephosphorizing sewage by the action of microorganisms contained in the activated sludge staying in the tank. The biological reaction tank 1 includes an aeration tank containing aerobic microorganisms such as ammonia oxidizing bacteria and nitrite oxidizing bacteria, an intermittent aeration tank containing aerobic microorganisms such as nitrite oxidizing bacteria and anaerobic microorganisms such as denitrifying bacteria. Can be used. The biological reaction tank 1 has a flow path L1 extending from a sewage supply source such as a first sedimentation tank (not shown), a flow path L2 extending from the final sedimentation tank 2, and a flow path L3 extending from the activated sludge concentrating device 3. It is connected. A final sedimentation basin 2 is connected to the biological reaction tank 1 via a flow path L4. An activated sludge concentrating device 3 is connected to the biological reaction tank 1 via a flow path L5.

最終沈殿池２は、流路Ｌ４を介して生物反応槽１から供給された処理水を分離液と汚泥とに沈降分離するものである。沈降分離後の分離液は、流路Ｌ６を介して最終沈殿池２から系外に放流される。沈降分離後の汚泥は、流路Ｌ２，Ｌ７を介して最終沈殿池２から系外又は生物反応槽１に引き抜くことができる。   The final sedimentation tank 2 settles and separates the treated water supplied from the biological reaction tank 1 through the flow path L4 into a separation liquid and sludge. The separation liquid after sedimentation separation is discharged out of the system from the final sedimentation tank 2 via the flow path L6. The sludge after sedimentation can be extracted from the final sedimentation basin 2 to the outside of the system or the biological reaction tank 1 through the flow paths L2 and L7.

活性汚泥濃縮装置３は、流路Ｌ５を介して生物反応槽１から供給された処理水を分離液と活性汚泥濃縮液とに濃縮分離するものである。活性汚泥濃縮装置３としては、精密ろ過膜（ＭＦ膜），限外ろ過膜（ＵＦ膜），ナノろ過膜（ＮＦ膜）等のろ過膜を備えた中空糸膜モジュール，平膜型モジュール，スパイラル型モジュール，管型モジュール等の形態の膜モジュールを例示することができる。濃縮分離後の分離液は、流路Ｌ８を介して活性汚泥濃縮装置３から系外に放流される。濃縮分離後の活性汚泥濃縮液は、流路Ｌ３を介して活性汚泥濃縮装置３から生物反応槽１に引き抜くことができる。   The activated sludge concentrating device 3 concentrates and separates the treated water supplied from the biological reaction tank 1 through the flow path L5 into a separated liquid and an activated sludge concentrated liquid. The activated sludge concentrator 3 includes hollow fiber membrane modules, flat membrane modules, spirals equipped with filtration membranes such as microfiltration membranes (MF membranes), ultrafiltration membranes (UF membranes), and nanofiltration membranes (NF membranes). A membrane module in the form of a mold module, a tubular module, etc. can be exemplified. The separated liquid after concentration and separation is discharged out of the system from the activated sludge concentrating device 3 through the flow path L8. The activated sludge concentrate after concentration and separation can be extracted from the activated sludge concentrating device 3 to the biological reaction tank 1 via the flow path L3.

制御装置４は、パーソナルコンピュータ等の情報処理装置によって構成されている。制御装置４は、下水流入量が計画最大流入量を超過することが予想される場合、流路Ｌ５に設けられた開閉バルブＢの開度を調整することによって、生物反応槽１内の活性汚泥混合液の一部を活性汚泥濃縮装置３に供給することにより、生物反応槽１及び最終沈殿池２内の活性汚泥混合液の水位を所定値以下に低下させるものである。下水流入量が計画最大流入量を超過するか否かは、制御装置４に対するオペレータの入力操作や天気予報に基づいて判断することができる。制御装置４は、本発明に係る判別手段及び制御手段として機能する。   The control device 4 is configured by an information processing device such as a personal computer. When the sewage inflow amount is expected to exceed the planned maximum inflow amount, the control device 4 adjusts the opening degree of the opening / closing valve B provided in the flow path L5 to thereby activate the activated sludge in the biological reaction tank 1. By supplying a part of the mixed liquid to the activated sludge concentrating device 3, the water level of the activated sludge mixed liquid in the biological reaction tank 1 and the final sedimentation basin 2 is lowered to a predetermined value or less. Whether or not the sewage inflow amount exceeds the planned maximum inflow amount can be determined based on an operator's input operation to the control device 4 or a weather forecast. The control device 4 functions as a determination unit and a control unit according to the present invention.

〔下水処理方法〕
次に、この下水処理装置を利用した本発明の一実施形態である下水処理方法について説明する。 [Sewage treatment method]
Next, a sewage treatment method that is an embodiment of the present invention using this sewage treatment apparatus will be described.

下水流入量が計画最大流入量以下の場合においては、流路Ｌ１から流入された下水は、生物反応槽１にて槽内の微生物の作用によって脱窒処理、脱リン処理されて、下水内の有機物，窒素成分，リン成分が低減乃至除去される。次に、生物反応槽１内の流入下水に相当する水量と生物反応槽１に返送された汚泥量に相当する水量の処理液とが流路Ｌ４から最終沈殿池２に送られて沈降分離される。最終沈殿池２では、ポリ塩化アルミニウム（ＰＡＣ），塩化第二鉄（ＦｅＣｌ３），硫酸バンド，ポリ硫酸第二鉄，重合珪酸―鉄塩（ＰＳＩ），ポリアクリルアミド系高分子，カチオン系高分子，アルギン酸ナトリウム等の凝集剤を注入して、処理液を沈降分離させやすくしてもよい。そして、最終沈殿池２から汚泥の一部又は全部を流路Ｌ２から引き抜き、好ましくは、生物反応槽１への返送量が一定量となるように流路Ｌ２から引き抜いて返送し、その残部を流路Ｌ７から引き抜いて余剰汚泥として排出する。分離液は、流路Ｌ６から系外に放流される。 In the case where the sewage inflow amount is less than or equal to the planned maximum inflow amount, the sewage flowed from the flow path L1 is denitrified and dephosphorized by the action of microorganisms in the tank in the biological reaction tank 1, Organic matter, nitrogen component, and phosphorus component are reduced or removed. Next, the amount of water corresponding to the inflow sewage in the biological reaction tank 1 and the treatment liquid having the amount of water corresponding to the amount of sludge returned to the biological reaction tank 1 are sent from the flow path L4 to the final settling basin 2 and separated by settling. The In the final sedimentation basin 2, polyaluminum chloride (PAC), ferric chloride (FeCl 3 ), sulfate band, polyferric sulfate, polymerized silicic acid-iron salt (PSI), polyacrylamide polymer, cationic polymer A flocculant such as sodium alginate may be injected to facilitate the sedimentation and separation of the treatment liquid. Then, a part or all of the sludge is drawn from the final sedimentation basin 2 from the flow path L2, and preferably, the sludge is drawn back from the flow path L2 so that the return amount to the biological reaction tank 1 is constant, and the remaining part is returned. It pulls out from the flow path L7 and discharges as excess sludge. The separation liquid is discharged out of the system from the flow path L6.

一方、生物反応槽１への下水流入量が計画最大流入量を超過すると判断された場合においては、制御装置４が、流路Ｌ５に設けられた開閉バルブＢの開度を調整することによって、生物反応槽１内の活性汚泥混合液の一部を活性汚泥濃縮装置３に供給することにより、生物反応槽１及び最終沈殿池２内の活性汚泥混合液の水位を所定値以下に低下させる。そして、生物反応槽１及び最終沈殿池２内の活性汚泥混合液は、生物反応槽１への下水流入量が計画最大流入量以下の場合と同様に処理される。また、活性汚泥濃縮装置３は、流路Ｌ５を介して導入された処理液を分離液と活性汚泥濃縮液とに濃縮分離する。   On the other hand, when it is determined that the sewage inflow amount into the biological reaction tank 1 exceeds the planned maximum inflow amount, the control device 4 adjusts the opening degree of the opening / closing valve B provided in the flow path L5, By supplying a part of the activated sludge mixed liquid in the biological reaction tank 1 to the activated sludge concentrating device 3, the water level of the activated sludge mixed liquid in the biological reaction tank 1 and the final sedimentation basin 2 is lowered to a predetermined value or less. Then, the activated sludge mixed liquid in the biological reaction tank 1 and the final sedimentation basin 2 is processed in the same manner as in the case where the sewage inflow amount to the biological reaction tank 1 is equal to or less than the planned maximum inflow amount. Further, the activated sludge concentrating device 3 concentrates and separates the treatment liquid introduced through the flow path L5 into a separated liquid and an activated sludge concentrated liquid.

以上の説明から明らかなように、本発明の一実施形態である下水処理方法では、生物反応槽１への下水流入量が計画最大流入量を超過する場合、制御装置４が、流路Ｌ５に設けられた開閉バルブＢの開度を調整することによって、生物反応槽１内の活性汚泥混合液を活性汚泥濃縮装置３に供給することにより、生物反応槽１及び最終沈殿池２内の活性汚泥混合液の水位を所定値以下に低下させるので、下水流入量が計画最大流入量を超過する場合であっても下水を効率的に処理することができる。   As is clear from the above description, in the sewage treatment method according to an embodiment of the present invention, when the sewage inflow amount into the biological reaction tank 1 exceeds the planned maximum inflow amount, the control device 4 is placed in the flow path L5. By adjusting the opening degree of the open / close valve B provided, the activated sludge mixed liquid in the biological reaction tank 1 is supplied to the activated sludge concentrating device 3 to thereby activate the activated sludge in the biological reaction tank 1 and the final sedimentation basin 2. Since the water level of the mixed liquid is lowered to a predetermined value or less, the sewage can be efficiently treated even when the sewage inflow exceeds the planned maximum inflow.

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。すなわち、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。   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. That is, other embodiments, examples, operational 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 生物反応槽
２ 最終沈殿池
３ 活性汚泥濃縮装置
４ 制御装置
Ｂ 開閉バルブ
Ｌ１，Ｌ２，Ｌ３，Ｌ４，Ｌ５，Ｌ６，Ｌ７，Ｌ８ 流路 DESCRIPTION OF SYMBOLS 1 Biological reaction tank 2 Final sedimentation tank 3 Activated sludge concentration apparatus 4 Control apparatus B Open / close valve L1, L2, L3, L4, L5, L6, L7, L8 flow path

Claims (2)

下水流入量が計画最大流入量を超過するか否かを判別する判別ステップと、
前記判別ステップにおいて下水流入量が計画最大流入量を超過すると判別された場合、下水を分離液と活性汚泥濃縮液とに濃縮分離する濃縮装置に生物反応槽内の活性汚泥混合液を供給することによって、前記生物反応槽内の活性汚泥混合液の水位を所定値以下に低下させるステップと、
を含むことを特徴とする下水処理方法。 A determining step for determining whether or not the sewage inflow amount exceeds the planned maximum inflow amount;
When it is determined in the determination step that the sewage inflow amount exceeds the planned maximum inflow amount, the activated sludge mixed liquid in the biological reaction tank is supplied to a concentrating device that concentrates and separates the sewage into a separated liquid and an activated sludge concentrated liquid. The step of reducing the water level of the activated sludge mixed liquid in the biological reaction tank to a predetermined value or less,
A sewage treatment method comprising: 下水流入量が計画最大流入量を超過するか否かを判別する判別手段と、
前記判別手段によって下水流入量が計画最大流入量を超過すると判別された場合、活性汚泥混合液を分離液と活性汚泥濃縮液とに濃縮分離する濃縮装置に生物反応槽内の活性汚泥混合液を供給することによって、前記生物反応槽内の活性汚泥混合液の水位を所定値以下に低下させる制御手段と、
を備えることを特徴とする下水処理装置。 A discriminating means for discriminating whether the sewage inflow exceeds the planned maximum inflow;
When the determination means determines that the sewage inflow amount exceeds the planned maximum inflow amount, the activated sludge mixed liquid in the biological reaction tank is added to the concentrating device that concentrates and separates the activated sludge mixed liquid into the separated liquid and the activated sludge concentrated liquid. Control means for lowering the water level of the activated sludge mixed liquid in the biological reaction tank to a predetermined value or less by supplying;
A sewage treatment apparatus comprising:
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Publication number Priority date Publication date Assignee Title
CN104192997A (en) * 2014-08-28 2014-12-10 南京中电环保股份有限公司 Sludge backflow system based on control of sludge age

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JP2008237958A (en) * 2007-03-26 2008-10-09 Metawater Co Ltd Sewage treatment method and apparatus
JP2008310682A (en) * 2007-06-15 2008-12-25 Toshiba Corp Device and method for creating rainwater and pollutant inflow arithmetic model

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JP2007061703A (en) * 2005-08-30 2007-03-15 Yokohama City Sewage treatment operation support system and program
JP2007144277A (en) * 2005-11-25 2007-06-14 Toshiba Corp System for controlling aeration
JP2008237958A (en) * 2007-03-26 2008-10-09 Metawater Co Ltd Sewage treatment method and apparatus
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* Cited by examiner, † Cited by third party
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