JP3917931B2 - Operation method of air diffuser - Google Patents

Operation method of air diffuser Download PDF

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Publication number
JP3917931B2
JP3917931B2 JP2002342824A JP2002342824A JP3917931B2 JP 3917931 B2 JP3917931 B2 JP 3917931B2 JP 2002342824 A JP2002342824 A JP 2002342824A JP 2002342824 A JP2002342824 A JP 2002342824A JP 3917931 B2 JP3917931 B2 JP 3917931B2
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air
diffuser
elastic membrane
amount
air supply
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JP2004174353A (en
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浩三 富永
昭浩 本間
イー ジャンセン ドミニック
アール モーガン チャールズ
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Tsukishima Kikai 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

Description

【０００１】
【発明の属する技術分野】
本発明は、多数の散気孔を有する弾性膜が支持体上に配置され、前記支持体と弾性膜との間に送気された気体の圧力によって、前記弾性膜が膨張状態に維持されつつ前記散気孔から散気がなされる散気手段を備える散気装置の運転方法に関する。特に前記散気手段が、パネル状の散気パネルである散気装置の運転方法に関する。
【０００２】
【従来の技術】
水処理設備においては下水等を生物処理するために散気装置が用いられている。一般的な散気装置は、処理水が保持された曝気槽内に設置される散気手段と、前記散気装置にガスあるいは空気等を送気するブロア等の送気手段を有する。曝気槽内に設置される散気手段としては筒状やノズル状など種々の形態のものが存在するが、そのなかに多数の散気孔を有する弾性膜が支持板上に積層配置されたパネル状の散気パネルがある。かかる散気パネルは、弾性膜が上面となるように曝気槽内に水平に設置され、前記支持板と弾性膜との間にガスあるいは空気を送気して散気を行う。散気中は、前記弾性膜が所定の膨張状態に維持されつつ前記散気孔から散気がなされる。このような散気パネルを用いた散気装置は、散気面積が広いので曝気効率が高い。
【特許文献１】
特開２００２−３５７８５号公報
【０００３】
【発明が解決しようとする課題】
しかしながら、散気パネルは、弾性膜を上面として曝気槽内に水平に設置されることから長時間連続的に使用していると曝気槽内の汚泥等が弾性膜上に付着したり堆積したりする。弾性膜上に汚泥等が付着したり堆積したりすると散気孔を塞いだり付着物の重量により弾性膜の膨張が妨げられたりして散気パネルへの送気量が低下する。従って、かかる付着物を弾性膜上から除去する必要がある。散気パネルの洗浄は曝気槽内の処理水を排出すれば可能であるが、実際の曝気処理では活性汚泥の保持等の観点から曝気槽内の処理水を頻繁に排出することは現実的ではない。曝気槽内の処理水を排出せることなく付着物を簡易に弾性膜上から除去可能な技術が求められる。
【０００４】
そこで、本発明の主たる課題は、簡易に、弾性膜上に付着した付着物を弾性膜上から剥離させて付着物の付着あるいは堆積物の堆積に起因する送気量の減少や送気圧の低下を改善でき、好適な曝気処理を持続して行える散気装置の運転方法を提供することにある。
【０００５】
【課題を解決するための手段】
上記課題を解決した本発明およびその作用効果は下記に示すとおりである。
＜請求項１記載の発明＞
多数の散気孔を有する弾性膜が支持体上に配置され、前記支持体と弾性膜との間に送気された気体の圧力によって、前記弾性膜が膨張状態に維持されつつ前記散気孔から散気がなされる散気手段が、処理水が満たされた曝気槽内に設置される散気装置の運転方法であって、
曝気槽内の溶存酸素量を計測し、その計測された溶存酸素量値に応じて散気手段への送気量を調節する溶存酸素量制御するとともに、
前記弾性膜上に付着した付着物を剥離するに際し、前記散気手段への送気を停止して前記弾性膜を収縮させ、その後に再度送気して前記弾性膜を膨張状態にし、前記付着物を前記弾性膜の膨縮により前記弾性膜から剥離させる操作を行い、
この剥離過程における再送気開始時以降、所定時間の遷移過程では、前記溶存酸素量制御を機能させずに、予め設定された送気量を超えない送気量で送気を行うことを特徴とする散気装置の運転方法。
【０００６】
（作用効果）
散気手段への送気を停止させると膨張状態となっていた弾性膜が収縮して支持板に張り付く。従って、弾性膜から付着物を剥離する。さらに、所定時間後に再度送気を開始することにより、弾性膜の再度膨張するとともに散気孔からガスあるいは空気が散気されるので、剥離した付着物が弾性膜上から飛ばされ弾性膜上から除去される。この散気手段への送気停止と再送気は、複数回繰り返して行ってもよい。
溶存酸素量値に応じて散気手段への送気量を制御している場合には、送気を所定時間停止させるとその停止の間に、計測される溶存酸素量値がほぼゼロ値になる。従って、何らの対処も施さずに送気を再開すれば散気手段にはそのゼロ値に応じた過度量のガスあるいは空気の送気がなされ、散気手段の破損等を引き起こす危険性が生ずる。しかし、本発明のように、所定時間の遷移過程では、溶存酸素量制御を機能させずに、予め設定した送気量を超えない送気量で送気を行うことにより、このような危険性がなくなる。
【０００７】
＜請求項２記載の発明＞
多数の散気孔を有する弾性膜が支持体上に配置され、前記支持体と弾性膜との間に送気された気体の圧力によって、前記弾性膜が膨張状態に維持されつつ前記散気孔から散気がなされる散気手段が、処理水が満たされた曝気槽内に設置される散気装置の運転方法であって、
曝気槽内の溶存酸素量を計測し、その計測された溶存酸素量値に応じて散気手段への送気量を調節する溶存酸素量制御するとともに、
前記弾性膜上に付着した付着物を剥離するに際し、前記散気手段への送気を停止して前記弾性膜を収縮させ、その後に再度送気して前記弾性膜を膨張状態にし、前記付着物を前記弾性膜の膨縮により前記弾性膜から剥離させる操作を行い、
この剥離過程における再送気開始時以降、所定時間の遷移過程では、送気量を、送気停止直前時の溶存酸素値に対応する送気量とほぼ同等の送気量とすることを特徴とする散気装置の運転方法。
【０００８】
（作用効果）
請求項１記載の発明と同様の作用効果を奏する。
【０００９】
＜請求項３記載の発明＞
遷移過程での送気風量調節弁の開度を、送気停止直前時の送気風量調節弁の開度とほぼ同じにして、遷移過程での送気量を送気停止直前時の送気量とほぼ同じにする請求項２記載の散気装置の運転方法。
【００１０】
（作用効果）
請求項１記載の発明と同様の作用効果を奏する。
【００１１】
＜請求項４記載の発明＞
前記散気手段への送気を停止した後または停止と同時に、送気手段から弾性膜までの間にある気体を排気して弾性膜にかかる気体の圧力を減少させ、前記弾性膜を収縮させる請求項１〜３のいずれか 1 項に記載の散気装置の運転方法。
【００１２】
（作用効果）
弾性膜をよりも早く、そして確実に収縮状態にすることができる。
【００１３】
＜請求項５記載の発明＞
前記散気手段が、多数の散気孔を有する弾性膜が支持板上に配置され、前記弾性膜の所定のゾーンの周囲が前記支持板上に固定され、前記支持板と弾性膜との間に送気された気体の圧力によって、前記弾性膜が膨張状態に維持されつつ前記散気孔から散気がなされる散気パネルであり、
前記散気装置が、前記散気パネルが処理水で満たされた曝気槽内に前記弾性膜を上面として設置されているものである請求項１〜４のいずれか 1 項に記載の散気装置の運転方法。
【００１４】
（作用効果）
散気手段としてパネル状の散気パネルを用いる場合には、弾性膜面を上面として曝気槽内に設置されるため、他の散気手段よりも付着物が付着しやすい。すなわち、弾性膜上に堆積作用による付着物の付着が発生する。従って、付着物の剥離によって得られる利益が顕著である。
【００１５】
＜請求項６記載の発明＞
多数の散気孔を有する弾性膜が支持体上に配置され、前記支持体と弾性膜との間に送気された気体の圧力によって、前記弾性膜が膨張状態に維持されつつ前記散気孔から散気がなされる散気手段が、処理水が満たされた曝気槽内に設置される散気装置の運転方法であって、
前記曝気槽は複数設けられ、主送気手段からの気体を分配して各曝気槽へ送気するように構成し、各曝気槽内の溶存酸素量を計測し、その計測された溶存酸素量値に応じて各曝気槽へ分配される送気量を制御し、
前記弾性膜上に付着した付着物を剥離するに際し、前記散気手段への送気を停止して前記弾性膜を収縮させる操作、並びにその後に再度送気して前記弾性膜を膨張状態にし、前記付着物を前記弾性膜の膨縮により前記弾性膜から剥離させる操作を各曝気槽単位行うことを特徴とする散気装置の運転方法。
【００１６】
（作用効果）
請求項１記載の発明と同様の作用効果を奏する。複数の曝気槽を有し主送気手段からのガスあるいは空気が分配されて各曝気槽へ送気される水処理設備では、散気パネルのメンテナンス性が高まる効果が高くなる。
さらに、複数の曝気槽を有し主送気手段からのガスあるいは空気が分配されて各曝気槽へ送気される水処理設備においては、曝気槽で送気を所定時間停止させる操作を行うと、その曝気槽へ送気されるべきガスあるいは空気が他の曝気槽に分配される。この場合には、その他の曝気槽への送気量が増加するので、その他の曝気槽に設置された散気パネル等が破損する恐れがある。しかし、本発明のように、曝気槽の溶存酸素量を測定し、その計測値に応じて、各曝気槽への送気量を制御するようにすれば、このようなおそれがなくなる。
【００１７】
【００１８】
【００１９】
【００２０】
【００２１】
【００２２】
【００２３】
【００２４】
【００２５】
【００２６】
【００２７】
【００２８】
【００２９】
【００３０】
【００３１】
【００３２】
【００３３】
【発明の実施の形態】
次いで、本発明の実施の形態を図１〜５を参照しながら詳述する。
（第１の実施の形態）
本実施の形態は、弾性膜上に付着した付着物を除去する操作を示すものである。本発明は曝気槽内に気体を散気する散気手段としていわゆる散気パネルを使用するものを対象とする。散気パネルＰの例を図１に、これを使用した散気装置１全体の概略を図２に示す。剥離除去操作過程の概略を図３に示す。図示例の散気パネルＰは、多数の散気孔Ｈを有する樹脂製の弾性膜１０が合成樹脂製の支持板１１上に配置され、ステンレス製の外周縁フレームＦ1およびチャンネルフレームＦ2により前記弾性膜１０の所定のゾーンの周囲が前記支持板１１上に固定されている。図１中、１５は、曝気槽への固定部材、１６は、各ゾーンに送気がなされるように、支持板に設けた溝である。
【００３４】
前記散気パネルＰには、前記弾性膜１０と支持板１１との間に連通する送気口１２が設けられており、この送気口１２には送気管１３が接続される。ブロア１４等の送気手段から送気される空気は送気管１３，１３…を介して弾性膜１０と支持板１１との間に供給され、送気がなされると弾性膜１０が膨張して弾性膜上の散気孔Ｈが開き、そして送気圧力が弾性膜１０にかかる水頭圧を超えると散気が開始される。図示例の散気パネルＰは送気口１２が弾性膜に設けられているが、送気口１２が支持板１１に設けられていてもよい。また、ブロア１４から送気する気体は空気に限られず、その他曝気に使用される適当なガスを選択することができる。配管素材や弾性膜材料などは使用するガスや常用送気圧に合わせて適当に変更することができる。
【００３５】
このような散気パネルＰを用いる散気装置１では、弾性膜１０に設けられた散気孔Ｈから散気がなされるため、前記弾性膜１０を上面として、汚水および活性汚泥の混合液等の処理水が満たされている曝気槽２０に水平に設置される。従って、使用中に弾性膜１０上に経時的にスライム等の付着物Ｓが付着あるいは堆積しやすい。付着物Ｓが付着すると散気孔Ｈが塞がれるので好適な散気が妨げられるので、これを除去する必要がある。なお、曝気槽内における散気パネルの高さ方向の設置位置（設置高さともいう。）は特に限定されない。通常は曝気槽底に配置させるが、処理水の循環管理等のためにバッフル等を曝気槽内に配設している場合には、その処理水の循環との関係で適宜設置位置を定めることができる。例えば、中間部など底よりも上方に位置させてもよい。
【００３６】
本実施の形態においては、スライム等の付着物Ｓの剥離除去は散気パネルＰへの送気を停止し、所定時間経過後に再度送気を開始することにより行う。この剥離除去操作の過程を図３に示す。（Ａ）に示されるように弾性膜１０は送気中においては所定の膨張状態となっている。このように弾性膜１０が膨張状態にある送気状態から送気を停止させると、（Ｂ）に示されるように、弾性膜１０の収縮力と水圧によって弾性膜１０が収縮して支持板１１に張り付いた状態に戻る。この収縮に要される時間は非常に短時間であるため、付着物Ｓは弾性膜１０の収縮には追随できずに付着位置近傍に留まり、付着していた付着物Ｓが弾性膜から剥離する。そして、所定時間経過した後に散気を行うと、（Ｃ）に示されるように散気された気体が弾性膜１０と付着物Ｓとの間に入り込み、付着物Ｓが弾性膜１０上から飛ばされる。
【００３７】
ここで、前記散気パネルへの送気を停止した後あるいは停止と同時に、前記送気管１３内の気体を排気して、弾性膜にかかる気体の圧力を低減させるのが好適である。このようにすると、水頭圧や弾性膜の弾性のみによる弾性膜の収縮よりも、早くそして確実に弾性膜を収縮させることができるようになる。この送気管１３内の気体を排気するに、例えば、送気管１３の途中に排気バルブ等を設けて排気すればよい。
【００３８】
また、散気を停止する時間は、曝気槽２０内の水流や曝気処理に用いる活性汚泥の寿命などを考慮して定めればよい。曝気処理に必要な活性汚泥は、送気を停止すると酸素不足により減少し始めるので、かかる活性汚泥が死滅しない程度の停止時間とするのが望ましい。
【００３９】
一方、上述の弾性膜１０上から付着物Ｓを剥離除去する操作は、手動によって適宜行うことも可能であるが、より簡易に剥離除去操作を行うために、自動制御にするのが望ましい。自動制御にする運転方法の例としては、散気パネルＰへの送気圧力に応じて送気の停止と開始とを自動で行うようにする運転方法が挙げられる。弾性膜１０上に付着物Ｓが付着した場合には、散気孔Ｈを塞いだり、付着物Ｓの重量により弾性膜１０の膨張が妨げられたりするため、ブロア１４から散気パネルＰへ送られる空気の送気圧力が上昇する。
【００４０】
従って、その送気圧力を測定して所定値に達したときに送気を自動的に停止させ、予め設定した所定時間経過後に再度送気を自動的に開始するようにする自動制御を行うことができる。このようにすると、より簡易に除去操作が行えるようになるほか、付着物Ｓの剥離除去が不十分である場合には、送気を再開しても送気圧が低下しないので、付着物Ｓの剥離除去が完全になされるまで剥離除去操作が繰り返されるので弾性膜１０上から付着物Ｓを確実に除去できる。散気パネルＰへの送気圧力は、送気管１３の途中に図示されない圧力計を設けて送気圧力を計測すればよい。
【００４１】
他方、自動制御にする他の運転方法として、予め送気の停止を行う時間と再開する時間とを定め、その時間に自動的に所定時間送気を停止することにより行うこともできる。いわゆるタイマー制御である。タイマー制御では、弾性膜１０上に付着物Ｓが付着したか否かにかかわらず操作が行われるので、常に好適な運転状態を維持することができる。さらに、付着物Ｓの付着状況を常時に監視する必要がなくなるという利点も有する。
【００４２】
なお、上記に示す送気圧力による自動制御とタイマーによる自動制御とは排他的なものではなく、送気圧力に応じた自動制御とタイマー制御との両方を行うようにしてもよい。
【００４３】
他方、図２に示される散気装置１のように、曝気槽２０内に複数の散気パネルＰ，Ｐ…が設置されており、ブロア１４からの空気が各散気パネルＰに分配されて送気されている場合においては、散気パネルＰごとに送気の停止と再送気の一連の操作を行うことができる。このような場合には、一つの散気パネルＰの送気を停止させても他の散気パネルＰからの散気が行われておており曝気槽内の水流が保持されるので、付着物Ｓはより移動しやすい状態である。従って、停止時間を短くすることができる。その他複数の散気パネルＰをグループ化して、グループごとに送気の停止と再送気の一連の剥離除去操作を行うようにしてもよい。
【００４４】
（第２の実施の形態）
近年、汚水処理場などでは処理水の溶存酸素量（以下、ＤＯと記載する。）に応じて散気パネルへの送気量を制御するいわゆるＤＯ制御を行うようになってきている。第２の実施の形態は、散気パネルＰを使用した散気装置１おいてこのようなＤＯ制御を行っている場合に、弾性膜１０上に付着した付着物Ｓを剥離除去する操作を行う例である。装置概略については第１の実施の形態と同様である。
【００４５】
一般的には、ＤＯ制御は、送気管１３の途中に風量計を設けるなどして、散気パネルＰへの送気量を計測するとともに、散気パネルＰの送気口１１から遠い位置にＤＯ計を設けて処理水中のＤＯ値を測定し、そのＤＯ値に応じた必要量の空気を散気パネルＰに送気する。必要となる送気量の調節は散気パネルＰへ通ずる送気管１３の途中に送気弁などを設けてその開閉具合を調整する。散気パネルＰごとに対応するブロア１４を設ける場合には送気手段の風量を調整したりすることによって行われる。また、ＤＯ制御を行う散気装置１では、ＤＯ値からの必要送気量の算出やそれに応ずる送気弁の開閉等はコンピューター等の制御手段によって集中管理する。
【００４６】
このようなＤＯ制御を行っている場合において、単純に送気の停止と再送気によって付着物の剥離除去操作を行おうとすると、弾性膜の破れやフレーム歪みななどの散気パネルＰの破損等の危険性が生する。この点について図４を参照しながら詳述する。ＤＯ制御が行われている散気装置において、ある送気量Ｑで運転されていたとする。送気を停止すると処理水中のＤＯ量が急速に低下してＤＯ計で計測されるＤＯ値はほぼゼロ値となる。そして、ＤＯ制御を機能させたまま、再度送気を開始すると、ＤＯ値＝０に応じた大量の空気が散気パネルＰへ送気され、散気パネルＰの破損を引き起こす可能性が生ずる。
【００４７】
そこで、このような危険性を回避すべく本実施の形態においては、図５に示すように、再送気開始時以降の所定時間の遷移過程においては、ＤＯ制御を機能させずに予め設定された送気量を超えない送気量で送気を行うようにする。前記予め設定する送気量は、図５に示される例では、Ｑ以上散気パネル限界送気量以下の任意の送気量を設定上限値としているがこの値に限定されるわけではない。その他、曝気槽や散気装置の型式、ブロアの限界送気量、活性汚泥の特性などを考慮して定めることができる。前記所定時間の設定についても同様である。尚、本発明においてはＤＯ制御を機能させないようにするが、ＤＯ値の計測を妨げるものではない。
【００４８】
また、第１の実施の形態と同様に、曝気槽２０内に複数の散気パネルＰ，Ｐ…が設置されており、ブロア１４からの空気が各散気パネルＰに分配されて送気されている場合においては、散気パネルＰごとあるいはグループごとに一連の付着物の剥離除去操作を行うことができる。
【００４９】
（第３の実施の形態）
一方、上述の例では、散気パネルへの送気量をＤＯ制御している場合の例であるが、複数の曝気槽を有し、主ブロアからの空気を分配して各曝気槽に送気する散気装置にあっては、各曝気槽に送気する送気量をＤＯ制御する場合がある。このように曝気槽への送気量をＤＯ制御している場合であっても、散気パネルへの送気量をＤＯ制御する場合の例と同様に、再度の送気開始の後所定時間の遷移過程においてＤＯ制御を機能させずに、曝気槽への送気量を所定設定値で行うようにする。この場合においては、曝気槽ごとに、剥離除去操作を行うことができる。
【００５０】
（その他）
上記第１〜３の実施例においては、散気手段として散気パネルを用いている散気装置について説明しているが、本発明における散気手段は、多数の散気孔を有する弾性膜が支持体上に配置され、前記支持体と弾性膜との間に送気された気体の圧力によって、前記弾性膜が膨張状態に維持されつつ前記散気孔から散気がなされる散気手段であればよく、前記散気パネルに限定されるものではない。従って、散気手段は、例えば図６に示されるような、送気管１３に接続される送気口１２と、側内外に連通する通気口１２ｂ,１２ｂ…を有する筒状の支持体１１Ｔと、この支持体１１Ｔを被覆する弾性膜１０とで構成される散気筒Ｔであってもよい。また、図７に示されるように、前記散気筒Ｔを複数並設して構成したものであってもよい。
【００５１】
【発明の効果】
以上詳述のとおり、本発明によれば、簡易に、弾性膜上に付着した付着物を弾性膜上から剥離させて付着物の付着に起因する送気量の減少や送気圧の低下を改善でき、好適な曝気処理を持続して行える散気装置の運転方法が提供される。
【図面の簡単な説明】
【図１】 散気パネルを示す図である。
【図２】 散気装置の概略を示す図である。
【図３】 付着物の除去の態様を示す図である。
【図４】 ＤＯ制御をしている場合の運転方法を説明するための図である。
【図５】 ＤＯ制御をしている場合の運転方法を説明するための他の図である。
【図６】 散気パネル以外の本発明にかかる散気手段（散気筒）の例を示す図である。
【図７】 散気筒を束ねた散気手段を示す図である。
【符号の説明】
１…散気装置、１０…弾性膜、１１…支持板、１２…送気口、１３…送気管、１４…ブロア、Ｈ…散気孔、Ｐ…散気パネル、Ｓ…付着物。[0001]
BACKGROUND OF THE INVENTION
In the present invention, an elastic film having a large number of air diffusion holes is disposed on a support, and the elastic film is maintained in an expanded state by the pressure of gas supplied between the support and the elastic film. The present invention relates to a method of operating an air diffuser including an air diffuser that diffuses air from an air diffuser. In particular, the present invention relates to a method of operating an air diffuser in which the air diffuser is a panel-shaped air diffuser panel.
[0002]
[Prior art]
In a water treatment facility, an air diffuser is used to biologically treat sewage and the like. A general air diffuser has an air diffuser installed in an aeration tank in which treated water is held, and an air supply unit such as a blower for supplying gas or air to the air diffuser. There are various types of diffuser means such as a cylinder or nozzle as the diffuser installed in the aeration tank. Among them, a panel shape in which an elastic film having a large number of diffuser holes is laminated on the support plate. There is an aeration panel. Such a diffuser panel is horizontally installed in the aeration tank so that the elastic membrane is on the upper surface, and diffuses gas or air between the support plate and the elastic membrane. During the air diffusion, the elastic film is maintained in a predetermined expanded state, and air is diffused from the air diffusion holes. An air diffuser using such an air diffuser panel has a high aeration efficiency due to its wide air diffused area.
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-35785
[Problems to be solved by the invention]
However, since the diffuser panel is installed horizontally in the aeration tank with the elastic membrane as the top surface, sludge in the aeration tank adheres to or accumulates on the elastic membrane when used continuously for a long time. To do. If sludge or the like adheres to or accumulates on the elastic membrane, the air diffusion holes are blocked or the expansion of the elastic membrane is hindered by the weight of the adhering matter, and the amount of air supplied to the air diffusion panel decreases. Therefore, it is necessary to remove such deposits from the elastic film. Although it is possible to clean the diffuser panel by discharging the treated water in the aeration tank, it is not realistic to discharge the treated water in the aeration tank frequently from the viewpoint of maintaining activated sludge in the actual aeration process. Absent. There is a need for a technique that can easily remove deposits from the elastic membrane without draining the treated water in the aeration tank.
[0004]
Therefore, the main problem of the present invention is that the deposit attached on the elastic film is simply peeled off from the elastic film to reduce the amount of air supply or the decrease in the air pressure caused by the adhesion of the deposit or the deposition of the deposit. The object is to provide a method of operating an air diffuser capable of improving the air quality and performing a suitable aeration process continuously.
[0005]
[Means for Solving the Problems]
The present invention that has solved the above-described problems and the effects thereof are as follows.
<Invention of Claim 1>
An elastic membrane having a large number of air diffusion holes is disposed on the support, and the elastic membrane is maintained in an expanded state by the pressure of the gas supplied between the support and the elastic membrane, and is diffused from the air diffusion holes. The aeration means to be anxious is the operation method of the aeration apparatus installed in the aeration tank filled with treated water,
While measuring the amount of dissolved oxygen in the aeration tank, and controlling the amount of dissolved oxygen to adjust the amount of air supplied to the diffuser means according to the measured amount of dissolved oxygen,
When peeling off the adhering matter adhering to the elastic film, the air supply to the air diffuser is stopped and the elastic film is contracted, and then the air is supplied again to bring the elastic film into an expanded state. Performing an operation of peeling the kimono from the elastic membrane by expansion and contraction of the elastic membrane ;
After starting re-transmission in the separation process, in the transition process for a predetermined time, the dissolved oxygen amount control is not functioned, and air is supplied with an air supply amount that does not exceed a preset air supply amount. To operate the air diffuser.
[0006]
(Function and effect)
When the air supply to the air diffuser is stopped, the elastic film that has been in an expanded state contracts and sticks to the support plate. Therefore, the deposit is peeled off from the elastic film. Furthermore, when the air supply is started again after a predetermined time, the elastic film expands again and gas or air is diffused from the diffuser holes, so the peeled off deposits are blown off from the elastic film and removed from the elastic film. Is done. This air supply stop and re-transmission to the air diffuser may be repeated a plurality of times.
If the amount of air supplied to the air diffuser is controlled according to the dissolved oxygen amount, if the air supply is stopped for a predetermined time, the measured dissolved oxygen amount is almost zero during that stop. Become. Therefore, if air supply is resumed without taking any measures, an excessive amount of gas or air is supplied to the air diffuser in accordance with the zero value, resulting in a risk of causing damage to the air diffuser. . However, in the transition process of the predetermined time as in the present invention, such a risk is caused by performing the air supply with an air supply amount not exceeding the preset air supply amount without functioning the dissolved oxygen amount control. Disappears.
[0007]
<Invention of Claim 2>
An elastic membrane having a large number of air diffusion holes is disposed on the support, and the elastic membrane is maintained in an expanded state by the pressure of the gas supplied between the support and the elastic membrane, and is diffused from the air diffusion holes. The aeration means to be anxious is the operation method of the aeration apparatus installed in the aeration tank filled with treated water,
While measuring the amount of dissolved oxygen in the aeration tank, and controlling the amount of dissolved oxygen to adjust the amount of air supplied to the diffuser means according to the measured amount of dissolved oxygen,
When peeling off the adhering matter adhering to the elastic film, the air supply to the air diffuser is stopped and the elastic film is contracted, and then the air is supplied again to bring the elastic film into an expanded state. Performing an operation of peeling the kimono from the elastic membrane by expansion and contraction of the elastic membrane ;
In the transition process for a predetermined time after the start of re-sending air in the separation process, the air-sending amount is set to be almost the same as the air-sending amount corresponding to the dissolved oxygen value immediately before stopping the air-feeding. To operate the air diffuser.
[0008]
(Function and effect)
The same effects as those of the first aspect of the invention can be achieved.
[0009]
<Invention of Claim 3>
The opening of the air supply control valve in the transition process is almost the same as the opening of the air supply control valve just before stopping the air supply, and the air supply in the transition process is just before stopping the air supply. The method of operating an air diffuser according to claim 2 , wherein the amount is substantially the same.
[0010]
(Function and effect)
The same effects as those of the first aspect of the invention can be achieved.
[0011]
<Invention of Claim 4>
After the air supply to the air diffuser is stopped or simultaneously with the stop, the gas between the air supply means and the elastic membrane is exhausted to reduce the pressure of the gas applied to the elastic membrane, and the elastic membrane is contracted. how the operation of the air diffuser device according to any one of claims 1 to 3.
[0012]
(Function and effect)
The elastic membrane can be contracted faster and more reliably.
[0013]
<Invention of Claim 5>
In the air diffuser, an elastic film having a large number of air holes is disposed on a support plate, a periphery of a predetermined zone of the elastic film is fixed on the support plate, and between the support plate and the elastic film. An air diffuser panel in which air is diffused from the air diffuser while the elastic membrane is maintained in an expanded state by the pressure of the gas sent.
The air diffuser is the diffuser panel air diffuser device according to any one of claims 1 to 4 in which is installed as the upper surface of the elastic membrane filled aeration tank with the treated water Driving method.
[0014]
(Function and effect)
When a panel-like diffuser panel is used as the diffuser, it is installed in the aeration tank with the elastic membrane surface as the upper surface, and therefore, deposits are more likely to adhere than other diffuser. That is, adhesion of the deposit due to the deposition action occurs on the elastic film. Therefore, the profits obtained by peeling off the deposits are significant.
[0015]
<Invention of Claim 6>
An elastic membrane having a large number of air diffusion holes is disposed on the support, and the elastic membrane is maintained in an expanded state by the pressure of the gas supplied between the support and the elastic membrane, and is diffused from the air diffusion holes. The aeration means to be anxious is the operation method of the aeration apparatus installed in the aeration tank filled with treated water,
A plurality of the aeration tanks are provided, configured to distribute the gas from the main aeration means and supply the gas to each aeration tank, measure the amount of dissolved oxygen in each aeration tank, and measure the amount of dissolved oxygen Control the amount of air delivered to each aeration tank according to the value,
Upon peeling the deposits adhered on the elastic membrane, the air operation to stop Ru to contract the elastic membrane to the diffuser means, and then to air again the elastic membrane expanded state An operation method of an air diffuser, wherein the operation of separating the deposit from the elastic film by expansion and contraction of the elastic film is performed for each aeration tank .
[0016]
(Function and effect)
The same effects as those of the first aspect of the invention can be achieved. In a water treatment facility that has a plurality of aeration tanks and distributes gas or air from the main aeration means to the aeration tanks, the effect of improving the maintainability of the aeration panel is enhanced.
Furthermore, in a water treatment facility that has a plurality of aeration tanks and distributes gas or air from the main aeration means to the aeration tanks, when the operation of stopping the aeration for a predetermined time is performed in the aeration tanks The gas or air to be sent to the aeration tank is distributed to other aeration tanks. In this case, since the amount of air supplied to the other aeration tanks increases, there is a possibility that the diffuser panels and the like installed in the other aeration tanks are damaged. However, if the amount of dissolved oxygen in the aeration tank is measured as in the present invention and the amount of air supplied to each aeration tank is controlled according to the measured value, such a fear is eliminated.
[0017]
[0018]
[0019]
[0020]
[0021]
[0022]
[0023]
[0024]
[0025]
[0026]
[0027]
[0028]
[0029]
[0030]
[0031]
[0032]
[0033]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described in detail with reference to FIGS.
(First embodiment)
The present embodiment shows an operation for removing the deposits attached on the elastic film. The present invention is directed to an apparatus that uses a so-called diffuser panel as an aeration means for diffusing gas in an aeration tank. An example of the diffuser panel P is shown in FIG. 1, and an outline of the entire diffuser 1 using the diffuser panel P is shown in FIG. An outline of the peeling and removing operation process is shown in FIG. In the air diffuser panel P shown in the drawing, a resin elastic membrane 10 having a large number of air diffuser holes H is disposed on a support plate 11 made of synthetic resin, and the aforementioned outer peripheral frame F 1 and channel frame F 2 are used to The periphery of a predetermined zone of the elastic membrane 10 is fixed on the support plate 11. In FIG. 1, 15 is a fixing member to the aeration tank, and 16 is a groove provided in the support plate so that air is supplied to each zone.
[0034]
The air diffuser panel P is provided with an air supply port 12 communicating between the elastic membrane 10 and the support plate 11, and an air supply tube 13 is connected to the air supply port 12. The air supplied from the air supply means such as the blower 14 is supplied between the elastic membrane 10 and the support plate 11 via the air supply pipes 13, 13... When the air is supplied, the elastic membrane 10 expands. When the air diffusion hole H on the elastic membrane is opened and the air supply pressure exceeds the water head pressure applied to the elastic membrane 10, the air diffusion is started. In the illustrated diffuser panel P, the air supply port 12 is provided in the elastic membrane, but the air supply port 12 may be provided in the support plate 11. Further, the gas sent from the blower 14 is not limited to air, and any other suitable gas used for aeration can be selected. The piping material and elastic membrane material can be appropriately changed according to the gas used and the normal air pressure.
[0035]
In the air diffuser 1 using such an air diffuser panel P, since air is diffused from the air diffuser holes H provided in the elastic membrane 10, the elastic membrane 10 is used as the upper surface, and a mixture of sewage and activated sludge is used. It is installed horizontally in the aeration tank 20 filled with treated water. Therefore, the deposit S such as slime tends to adhere or deposit over the elastic film 10 during use. When the deposit S adheres, the diffuser holes H are blocked, so that suitable aeration is prevented. Therefore, it is necessary to remove this. In addition, the installation position (it is also called installation height) of the height direction of the diffuser panel in an aeration tank is not specifically limited. Normally, it is placed at the bottom of the aeration tank, but if baffles etc. are installed in the aeration tank for the management of the circulation of treated water, the installation position should be determined appropriately in relation to the circulation of the treated water. Can do. For example, it may be positioned above the bottom such as an intermediate portion.
[0036]
In the present embodiment, the exfoliation and removal of the deposit S such as slime is performed by stopping the air supply to the diffuser panel P and starting the air supply again after a predetermined time. The process of this peeling removal operation is shown in FIG. As shown in (A), the elastic membrane 10 is in a predetermined expanded state during air supply. When the air supply is stopped from the air supply state in which the elastic film 10 is in the expanded state as described above, the elastic film 10 is contracted by the contraction force and the water pressure of the elastic film 10 as shown in FIG. Return to the state of sticking to. Since the time required for this contraction is very short, the deposit S cannot follow the contraction of the elastic film 10 and remains in the vicinity of the adhesion position, and the adhered deposit S is peeled off from the elastic film. . Then, when aeration is performed after a predetermined time has elapsed, the diffused gas enters between the elastic film 10 and the deposit S as shown in (C), and the deposit S is blown from the elastic film 10. It is.
[0037]
Here, it is preferable that after the air supply to the diffuser panel is stopped or simultaneously with the stop, the gas in the air supply pipe 13 is exhausted to reduce the pressure of the gas applied to the elastic membrane. In this case, the elastic film can be contracted faster and more reliably than the elastic film is contracted only by the hydraulic head pressure or the elasticity of the elastic film. In order to exhaust the gas in the air supply pipe 13, for example, an exhaust valve or the like may be provided in the middle of the air supply pipe 13.
[0038]
The time for stopping the aeration may be determined in consideration of the water flow in the aeration tank 20 and the life of the activated sludge used for the aeration treatment. The activated sludge required for the aeration treatment starts to decrease due to lack of oxygen when the air supply is stopped, so it is desirable to set the stop time so that the activated sludge does not die.
[0039]
On the other hand, the operation for peeling and removing the deposit S from the elastic film 10 can be appropriately performed manually. However, in order to perform the peeling and removing operation more easily, it is desirable to perform automatic control. As an example of the operation method for automatic control, there is an operation method for automatically stopping and starting the supply of air according to the pressure of the supply of air to the diffuser panel P. When the deposit S adheres on the elastic membrane 10, the air diffuser H is blocked, or the expansion of the elastic membrane 10 is hindered by the weight of the deposit S, so that the blower 14 is sent to the diffuser panel P. The air supply pressure rises.
[0040]
Therefore, automatic control is performed so that the air supply is automatically stopped when the air supply pressure is measured and reaches a predetermined value, and the air supply is automatically started again after a predetermined time has elapsed. Can do. In this way, the removal operation can be performed more easily, and in the case where the removal of the deposit S is insufficient, the air supply pressure does not decrease even when the air supply is resumed. Since the peeling / removing operation is repeated until the peeling / removal is completed, the deposit S can be reliably removed from the elastic film 10. The air supply pressure to the diffuser panel P may be measured by providing a pressure gauge (not shown) in the middle of the air supply pipe 13.
[0041]
On the other hand, as another operation method for automatic control, a time for stopping air supply and a time for resuming air supply may be determined in advance, and the air supply may be automatically stopped for a predetermined time at that time. This is so-called timer control. In the timer control, an operation is performed regardless of whether or not the deposit S has adhered to the elastic film 10, and therefore a suitable operating state can always be maintained. Furthermore, there is an advantage that it is not necessary to constantly monitor the adhesion state of the deposit S.
[0042]
Note that the automatic control based on the air supply pressure and the automatic control based on the timer described above are not exclusive, and both the automatic control corresponding to the air supply pressure and the timer control may be performed.
[0043]
On the other hand, like the diffuser 1 shown in FIG. 2, a plurality of diffuser panels P, P... Are installed in the aeration tank 20, and the air from the blower 14 is distributed to each diffuser panel P. When air is being supplied, a series of operations of stopping air supply and re-sending air can be performed for each of the diffuser panels P. In such a case, even if the air supply of one of the diffuser panels P is stopped, the diffuser from the other diffuser panels P is carried out and the water flow in the aeration tank is maintained. The kimono S is more easily moved. Therefore, the stop time can be shortened. In addition, a plurality of diffused panels P may be grouped, and a series of stripping and removing operations for air supply stop and retransmission air may be performed for each group.
[0044]
(Second Embodiment)
In recent years, in sewage treatment plants and the like, so-called DO control for controlling the amount of air supplied to the diffuser panel according to the dissolved oxygen amount (hereinafter referred to as DO) of the treated water has been performed. In the second embodiment, when such a DO control is performed in the air diffuser 1 using the air diffuser panel P, an operation of peeling and removing the deposit S attached on the elastic film 10 is performed. It is an example. The apparatus outline is the same as that of the first embodiment.
[0045]
In general, the DO control measures the amount of air supplied to the air diffuser panel P by providing an air flow meter in the middle of the air supply pipe 13, and at a position far from the air inlet 11 of the air diffuser panel P. A DO meter is provided to measure the DO value in the treated water, and a necessary amount of air corresponding to the DO value is supplied to the diffuser panel P. The required amount of air supply is adjusted by providing an air supply valve or the like in the middle of the air supply pipe 13 leading to the diffuser panel P to adjust the opening / closing state. When providing the corresponding blower 14 for every diffuser panel P, it is performed by adjusting the air volume of an air supply means. Further, in the air diffuser 1 that performs DO control, the calculation of the required air supply amount from the DO value, the opening and closing of the air supply valve corresponding thereto, and the like are centrally managed by a control means such as a computer.
[0046]
When such DO control is performed, if an attempt is made to simply remove and remove the adhering substance by stopping the air supply and re-sending air, the air diffuser panel P is damaged such as an elastic film breakage or frame distortion. The danger of is born. This point will be described in detail with reference to FIG. It is assumed that the air diffuser in which the DO control is performed is operated with a certain air supply amount Q. When the air supply is stopped, the DO amount in the treated water rapidly decreases, and the DO value measured by the DO meter becomes almost zero. When air supply is started again with the DO control functioning, a large amount of air corresponding to DO value = 0 is supplied to the air diffuser panel P, which may cause damage to the air diffuser panel P.
[0047]
Therefore, in the present embodiment, in order to avoid such a risk, as shown in FIG. 5, in the transition process for a predetermined time after the start of retransmission, the DO control is set in advance without functioning. Air should be supplied with an air supply amount that does not exceed the air supply amount. In the example shown in FIG. 5, the preset air supply amount is set to an arbitrary air supply amount that is greater than or equal to Q and less than or equal to the diffuse panel limit air supply amount, but is not limited to this value. In addition, it can be determined in consideration of the model of the aeration tank and the diffuser, the limit air supply amount of the blower, the characteristics of the activated sludge, and the like. The same applies to the setting of the predetermined time. In the present invention, the DO control is not allowed to function, but it does not hinder the measurement of the DO value.
[0048]
Further, similarly to the first embodiment, a plurality of diffuser panels P, P... Are installed in the aeration tank 20, and the air from the blower 14 is distributed to each diffuser panel P and supplied. In such a case, it is possible to perform a series of operations for removing and removing the adhered matter for each diffuser panel P or for each group.
[0049]
(Third embodiment)
On the other hand, the above example is an example in which the amount of air supplied to the diffuser panel is DO-controlled, but it has a plurality of aeration tanks, distributes air from the main blower and sends it to each aeration tank. In the diffuser to be aired, the amount of air supplied to each aeration tank may be DO controlled. Even when the air supply amount to the aeration tank is DO-controlled in this way, a predetermined time after the start of air supply again, as in the case of DO control of the air supply amount to the diffuser panel In this transition process, the air supply amount to the aeration tank is set at a predetermined set value without causing the DO control to function. In this case, the peeling and removing operation can be performed for each aeration tank.
[0050]
(Other)
In the first to third embodiments, the air diffuser using an air diffuser panel as the air diffuser is described. However, the air diffuser in the present invention is supported by an elastic film having a large number of air diffusers. Any air diffuser that is disposed on the body and diffuses from the air diffuser while the elastic membrane is maintained in an expanded state by the pressure of the gas supplied between the support and the elastic membrane. Well, it is not limited to the diffuser panel. Therefore, for example, as shown in FIG. 6, the air diffuser includes an air supply port 12 connected to the air supply tube 13, a cylindrical support body 11 </ b> T having vent holes 12 b, 12 b, which communicate with the inside and outside of the side, A discrete cylinder T constituted by the elastic film 10 covering the support 11T may be used. Further, as shown in FIG. 7, it may be configured by arranging a plurality of the above-mentioned scattered cylinders T in parallel.
[0051]
【The invention's effect】
As described above in detail, according to the present invention, the deposit attached on the elastic membrane is simply peeled off from the elastic membrane to improve the decrease in the amount of air supply and the decrease in the air pressure due to the adhesion of the deposit. A method of operating the air diffuser that can perform a suitable aeration process continuously is provided.
[Brief description of the drawings]
FIG. 1 is a view showing an air diffusion panel.
FIG. 2 is a diagram showing an outline of an air diffuser.
FIG. 3 is a view showing an aspect of removing deposits.
FIG. 4 is a diagram for explaining an operation method when DO control is performed.
FIG. 5 is another diagram for explaining an operation method when DO control is performed.
FIG. 6 is a view showing an example of a diffuser means (diffuse cylinder) according to the present invention other than the diffuser panel.
FIG. 7 is a view showing a diffuser unit in which diffused cylinders are bundled.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Air diffuser, 10 ... Elastic film, 11 ... Support plate, 12 ... Air supply port, 13 ... Air supply pipe, 14 ... Blower, H ... Air diffuser, P ... Air diffuser panel, S ... Adhesion.

Claims (6)

多数の散気孔を有する弾性膜が支持体上に配置され、前記支持体と弾性膜との間に送気された気体の圧力によって、前記弾性膜が膨張状態に維持されつつ前記散気孔から散気がなされる散気手段が、処理水が満たされた曝気槽内に設置される散気装置の運転方法であって、
曝気槽内の溶存酸素量を計測し、その計測された溶存酸素量値に応じて散気手段への送気量を調節する溶存酸素量制御するとともに、
前記弾性膜上に付着した付着物を剥離するに際し、前記散気手段への送気を停止して前記弾性膜を収縮させ、その後に再度送気して前記弾性膜を膨張状態にし、前記付着物を前記弾性膜の膨縮により前記弾性膜から剥離させる操作を行い、
この剥離過程における再送気開始時以降、所定時間の遷移過程では、前記溶存酸素量制御を機能させずに、予め設定された送気量を超えない送気量で送気を行うことを特徴とする散気装置の運転方法。An elastic membrane having a large number of air diffusion holes is disposed on the support, and the elastic membrane is maintained in an expanded state by the pressure of the gas supplied between the support and the elastic membrane, and is diffused from the air diffusion holes. The aeration means to be anxious is the operation method of the aeration apparatus installed in the aeration tank filled with treated water,
While measuring the amount of dissolved oxygen in the aeration tank, and controlling the amount of dissolved oxygen to adjust the amount of air supplied to the diffuser means according to the measured amount of dissolved oxygen,
When peeling off the adhering matter adhering to the elastic film, the air supply to the air diffuser is stopped and the elastic film is contracted, and then the air is supplied again to bring the elastic film into an expanded state. Performing an operation of peeling the kimono from the elastic membrane by expansion and contraction of the elastic membrane ;
After starting re-transmission in the separation process, in the transition process for a predetermined time, the dissolved oxygen amount control is not functioned, and air is supplied with an air supply amount that does not exceed a preset air supply amount. To operate the air diffuser. 多数の散気孔を有する弾性膜が支持体上に配置され、前記支持体と弾性膜との間に送気された気体の圧力によって、前記弾性膜が膨張状態に維持されつつ前記散気孔から散気がなされる散気手段が、処理水が満たされた曝気槽内に設置される散気装置の運転方法であって、
曝気槽内の溶存酸素量を計測し、その計測された溶存酸素量値に応じて散気手段への送気量を調節する溶存酸素量制御するとともに、
前記弾性膜上に付着した付着物を剥離するに際し、前記散気手段への送気を停止して前記弾性膜を収縮させ、その後に再度送気して前記弾性膜を膨張状態にし、前記付着物を前記弾性膜の膨縮により前記弾性膜から剥離させる操作を行い、
この剥離過程における再送気開始時以降、所定時間の遷移過程では、送気量を、送気停止直前時の溶存酸素値に対応する送気量とほぼ同等の送気量とすることを特徴とする散気装置の運転方法。An elastic membrane having a large number of air diffusion holes is disposed on the support, and the elastic membrane is maintained in an expanded state by the pressure of the gas supplied between the support and the elastic membrane, and is diffused from the air diffusion holes. The aeration means to be anxious is the operation method of the aeration apparatus installed in the aeration tank filled with treated water,
While measuring the amount of dissolved oxygen in the aeration tank, and controlling the amount of dissolved oxygen to adjust the amount of air supplied to the diffuser means according to the measured amount of dissolved oxygen,
When peeling off the adhering matter adhering to the elastic film, the air supply to the air diffuser is stopped and the elastic film is contracted, and then the air is supplied again to bring the elastic film into an expanded state. Performing an operation of peeling the kimono from the elastic membrane by expansion and contraction of the elastic membrane ;
In the transition process for a predetermined time after the start of re-sending air in the separation process, the air-sending amount is set to be almost the same as the air-sending amount corresponding to the dissolved oxygen value immediately before stopping the air-feeding. To operate the air diffuser. 遷移過程での送気風量調節弁の開度を、送気停止直前時の送気風量調節弁の開度とほぼ同じにして、遷移過程での送気量を送気停止直前時の送気量とほぼ同じにする請求項２記載の散気装置の運転方法。The opening of the air supply control valve in the transition process is almost the same as the opening of the air supply control valve just before stopping the air supply, and the air supply in the transition process is just before stopping the air supply. The method of operating an air diffuser according to claim 2 , wherein the amount is substantially the same. 前記散気手段への送気を停止した後または停止と同時に、送気手段から弾性膜までの間にある気体を排気して弾性膜にかかる気体の圧力を減少させ、前記弾性膜を収縮させる請求項１〜３のいずれか 1 項に記載の散気装置の運転方法。After the air supply to the air diffuser is stopped or simultaneously with the stop, the gas between the air supply means and the elastic membrane is exhausted to reduce the pressure of the gas applied to the elastic membrane, and the elastic membrane is contracted. how the operation of the air diffuser device according to any one of claims 1 to 3. 前記散気手段が、多数の散気孔を有する弾性膜が支持板上に配置され、前記弾性膜の所定のゾーンの周囲が前記支持板上に固定され、前記支持板と弾性膜との間に送気された気体の圧力によって、前記弾性膜が膨張状態に維持されつつ前記散気孔から散気がなされる散気パネルであり、
前記散気装置が、前記散気パネルが処理水で満たされた曝気槽内に前記弾性膜を上面として設置されているものである請求項１〜４のいずれか 1 項に記載の散気装置の運転方法。In the air diffuser, an elastic film having a large number of air holes is disposed on a support plate, a periphery of a predetermined zone of the elastic film is fixed on the support plate, and between the support plate and the elastic film. An air diffuser panel in which air is diffused from the air diffuser while the elastic membrane is maintained in an expanded state by the pressure of the gas sent.
The air diffuser is the diffuser panel air diffuser device according to any one of claims 1 to 4 in which is installed as the upper surface of the elastic membrane filled aeration tank with the treated water Driving method. 多数の散気孔を有する弾性膜が支持体上に配置され、前記支持体と弾性膜との間に送気された気体の圧力によって、前記弾性膜が膨張状態に維持されつつ前記散気孔から散気がなされる散気手段が、処理水が満たされた曝気槽内に設置される散気装置の運転方法であって、
前記曝気槽は複数設けられ、主送気手段からの気体を分配して各曝気槽へ送気するように構成し、各曝気槽内の溶存酸素量を計測し、その計測された溶存酸素量値に応じて各曝気槽へ分配される送気量を制御し、
前記弾性膜上に付着した付着物を剥離するに際し、前記散気手段への送気を停止して前記弾性膜を収縮させる操作、並びにその後に再度送気して前記弾性膜を膨張状態にし、前記付着物を前記弾性膜の膨縮により前記弾性膜から剥離させる操作を各曝気槽単位行うことを特徴とする散気装置の運転方法。An elastic membrane having a large number of air diffusion holes is disposed on the support, and the elastic membrane is maintained in an expanded state by the pressure of the gas supplied between the support and the elastic membrane, and is diffused from the air diffusion holes. The aeration means to be anxious is the operation method of the aeration apparatus installed in the aeration tank filled with treated water,
A plurality of the aeration tanks are provided, configured to distribute the gas from the main aeration means and supply the gas to each aeration tank, measure the amount of dissolved oxygen in each aeration tank, and measure the amount of dissolved oxygen Control the amount of air delivered to each aeration tank according to the value,
Upon peeling the deposits adhered on the elastic membrane, the air operation to stop Ru to contract the elastic membrane to the diffuser means, and then to air again the elastic membrane expanded state An operation method of an air diffuser, wherein the operation of separating the deposit from the elastic film by expansion and contraction of the elastic film is performed for each aeration tank .
JP2002342824A 2002-11-26 2002-11-26 Operation method of air diffuser Expired - Fee Related JP3917931B2 (en)

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JP2006289277A (en) * 2005-04-12 2006-10-26 Tsukishima Kikai Co Ltd Nitrate forming nitrification/denitrification method, method for nitrifying/denitrifying ammonia nitrogen-containing liquid and nitrate forming nitrification/denitrification equipment
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DE102010002959A1 (en) * 2010-03-17 2011-09-22 Invent Umwelt-Und Verfahrenstechnik Ag Apparatus for gassing a suspension received in a treatment tank
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KR102335460B1 (en) * 2021-05-06 2021-12-06 미래그린텍 주식회사 Apparatus and method for removing foreign substances from the membrane diffuser through dynamic wet pressure sensing

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