JP3839384B2

JP3839384B2 - Merger processing purification equipment

Info

Publication number: JP3839384B2
Application number: JP2002283007A
Authority: JP
Inventors: 忠行泉; 尚紀門屋; 亘高橋
Original assignee: ダイキ株式会社
Priority date: 2002-09-27
Filing date: 2002-09-27
Publication date: 2006-11-01
Anticipated expiration: 2022-09-27
Also published as: JP2004113971A

Description

【０００１】
【発明が属する技術分野】
汚水を生物処理により浄化する汚水の浄化処理手段に関する。
一層具体的にいえば、供給される汚水を受け入れて一定の流量に調整して送り出す流量調整槽と、送り出される汚水を、微生物を坦持させた坦体または、ばっ気により浄化処理する生物処理槽と、処理した汚水から汚泥を沈澱させて分離する沈澱槽と、沈澱槽に沈澱した汚泥をその沈澱槽から常時または一定の時間毎に抜き出して貯留し濃縮する汚泥濃縮貯留槽とから合併処理浄化装置についての改良に関する。
【０００２】
【従来の技術】
合併処理浄化装置は、通常、図１に示しているように、汚水の供給ラインＬ１に接続する流量調整槽ａと、ここからポンプＰで汲み出される汚水を一定の流量に計量して吐出する汚水計量槽ｂと、所定の流量に計量されて流出する汚水を受け入れる生物処理槽ｄと、ここで処理された処理水から汚泥を沈澱させて分離する沈澱槽ｅと、この沈澱槽ｅに沈澱した汚泥を、常時または間欠的に引き抜いて貯留し濃縮する汚泥濃縮貯留槽ｃとで構成される。
【０００３】
そして、供給ラインＬ１から供給される汚水は、流量調整槽ａから水中ポンプなどの移送ポンプＰで計量槽ｂに送り、そこから一定の流出量に調整して生物処理槽ｄに送り込み、ここで、微生物を坦持させた坦体または濾材に接触させるか、または、ばっ気により生物処理を行い、この処理を行った汚水を沈澱槽ｅに順次溢流させて移送し、この沈澱槽ｅで汚泥を重力により沈降させ、沈積した汚泥を、常時または間欠的に引き抜いて移送ラインＬ２により汚泥濃縮貯留槽ｃに移送し、ここで、重い汚泥とガスを含む軽い汚泥とに分離させ、そのとき脱離してくる中間の脱離液を脱離液返送管１により流量調整槽ａに返送するようにする。
【０００４】
そして、これにより、供給ラインＬ１から流量調整槽ａに供給された汚水が、図２のフローシートに示しているように、流量調整槽ａから計量槽ｂを経て生物処理槽ｄに送られ、そこから沈澱槽ｅに移送され、そこに沈澱する汚泥が引き抜かれて汚泥濃縮貯留槽ｃに移送され、そこで分離する脱離液が流量調整槽ａに返送され、汚水と共にふたたび計量槽ｂから生物処理槽ｄに供給されるように循環し、この循環の間に、沈澱槽ｅにおいて、沈降する汚泥から分離した上澄みの液を処理水として溢流させて放流するか、さらに消毒槽を経て、所定の規準の水質の処理水として放流する。
【０００５】
また、この循環の間に次第に集積してくる汚泥濃縮貯留槽ｃ内の汚泥を、所定の間隔をおいて定期的に行うバキウム車による引き抜きで、外部に排除するようにし、これにより、汚水の生物処理による浄化が行われるようにしている。
【０００６】
【発明が解決しようとする課題】
合併処理浄化装置は、流量調整槽ａに供給される汚水を、計量槽ｂにより流出量を調整して生物処理槽ｄに送り込み、ここで生物処理した処理水を沈澱槽ｅに順次溢流させて移送し、この沈澱槽ｅにおいて重い汚泥を沈澱させ、その汚泥を常時または間欠的に引き抜いて移送ラインＬ２により汚泥濃縮貯留槽ｃに移送し、ここで重い汚泥と、ガスを含む軽い汚泥とに分離させて、中間に生ずる脱離液を返送管１により流量調整槽ａに溢流返送することで計量槽ｂを経て、再び生物処理槽ｄに戻すよう循環させ、この循環の間に、沈澱槽ｅにおいて沈降する汚泥から分離した上澄みの処理水を順次放流していくのであるから、計量槽ｂから生物処理槽ｄに送り込む汚水の流量と、沈澱槽ｅから引き抜いて汚泥濃縮貯留槽ｃに戻す汚泥の戻し量とが適切に調整されていれば、生物処理槽ｄにおける汚水の生物処理および沈澱槽ｅからの処理水の溢流放出が、適切に行われて、汚水を所定の規準の水質の処理水として放流していくようになる。
【０００７】
この合併処理浄化装置においては、計量槽ｂから生物処理槽ｄに供給する汚水の流量および沈澱槽ｅから汚泥を引き抜いて汚泥濃縮貯留槽ｃに戻す汚泥の戻し量を適切にするよう維持管理することが、生物処理を有効に働かすよう施設を稼働機能させるための、重要な条件となる。
【０００８】
これは、計量槽ｂからの汚水の供給量が多目であれば、生物処理槽ｄから沈澱槽ｅに溢流してくる汚水の量が多くなって、沈澱槽ｅにおける汚泥の沈降による分離が充分に行われないまま、沈澱槽ｅから放流されるようになることから、沈澱槽ｅからの引き抜きの頻度を多くして引き抜き量を増やさなければならない。そのようにすると、汚水の循環が早くなって、汚水の生物処理槽ｄでの滞留時間が短くなり、生物処理の効率が低下してくる。また、計量槽ｂからの流出量をおとし、沈澱槽ｅからの引き抜き量を少なくして、循環させる汚水の量を小さくすると、沈澱槽ｅにおいて沈降した汚泥が古くなることでガスが発生して、浮遊汚泥が生じ、これが、放流水と共に流出して、放流水の水質を悪くするようになるからであり、このことから、汚水の供給量と汚泥の引き抜き量との調整の管理が、この合併処理浄化装置の運転・稼働する上に重要な要件となってくる。
【０００９】
しかし、この合併処理浄化装置の稼働・運転の維持管理は、例えば、生物処理槽ｄにおける微生物の活動が、温度・気温の変動により変化することなどから、日々、生物処理槽ｄにおける汚水の処理状況および沈澱槽ｅにおける汚泥の沈降状態を、目視により監視しながら、マンコントロールで行わなければならない。このため、合併処理浄化装置におけるこの維持管理は、甚だ厄介なものとなっている。
【００１０】
本発明は、従前の合併処理浄化装置に生じている維持管理が面倒で厄介な問題を解消するためになされたものであって、その維持管理が簡略に行えるようにする新たな手段を提供することを目的とする。
【００１１】
【課題を解決するための手段】
本発明は、上述の目的を達成するために、種々の試行錯誤を重ねて得られた知見によってなされたものである。
【００１２】
即ち、従前手段にあっては、沈澱槽ｅから引き抜いて汚泥を貯留させる汚泥濃縮貯留槽ｃにおいて、汚泥と分離した脱離液を、流量調整槽ａに戻すよう溢流させていることで、生物処理槽ｄに供給される汚水の供給量と、沈澱槽ｅからの汚泥の引き抜き量とを、沈澱槽ｅからの処理水の流出・放流が、適正な水質に保持されて行われるように、バランスされた状態に調整するようにするが、この生物処理槽ｄと沈澱槽ｅとの二者の水位のバランスを、沈澱槽ｅおよび生物処理槽ｄにおける汚泥の処理状況を見ながら行わなければならない。
【００１３】
しかも、計量槽ｂから生物処理槽ｄへの汚水の流量を多くすると、これに応じて沈澱槽ｅからの汚泥の引き抜き量を多くしなければならず、そのようにすると、生物処理槽ｄにおける汚水の滞留時間が短くなって、生物処理が有効に機能しないようになる。
【００１４】
そこで、この汚泥濃縮貯留槽ｃにおいて生じる脱離液を、返送管ｆにより生物処理槽ｄに返送して、汚水が計量槽ｂを経ないで、汚泥濃縮貯留槽ｃと生物処理槽ｄと沈澱槽ｅとの三者の間を循環するようにしたところ、沈澱槽ｅにおいて沈澱した汚泥を引き抜く量が多くなっても、その汚泥が脱離液となって生物処理槽ｄに戻され、沈澱槽ｅに循環してくることで、生物処理槽ｄの水位が所定に保持され、かつ、循環することにより生物処理槽ｄにおける滞留時間を短くすることもなく、生物処理の機能を損なわせないようになり、これにより、沈澱槽ｅにおける汚泥の沈澱状況を見て汚泥の引き抜き量を調整すればよく、維持管理が、種々の操作を行わずに、簡略に行える、という結果が得られた。
【００１５】
そして、このことから、本発明においては、上述の目的を達成するための手段として、請求項１に記載した、汚水が供給される供給ラインＬ１と、供給される汚水を受け入れる流量調整槽ａと、流量調整槽ａから汚水を汲み上げる移送ポンプＰ１と、移送ポンプＰ１で汲み上げた汚水を所望の流量に調整して移送管２に流出させる計量槽ｂと、計量槽ｂから移送管２を経て流出してくる汚水を受け入れて生物処理を行う生物処理槽ｄと、生物処理槽ｄから溢流する汚水を受け入れて汚水中の汚泥を沈降分離せしめ上澄みを流出口７０から放流する沈澱槽ｅと、沈澱槽ｅ内に沈澱する汚泥を引き抜いて移送ラインＬ２により移送する引き抜きポンプＰ２と、引き抜きポンプＰ２で引き抜かれる沈澱槽ｅに沈澱した汚泥を受け入れて貯留し濃縮する汚泥濃縮貯留槽ｃと、からなる合併処理浄化装置Ａにおいて、沈澱槽ｅから引き抜きポンプＰ２で引き抜く沈澱した汚泥を移送する移送ラインＬ２の先端側を、計量槽ｂを経ずに汚泥濃縮貯留槽ｃに連通し、汚泥濃縮貯留槽ｃには、それの底に沈降する重い汚泥の層と上面に浮遊してくるガスを含む軽い汚泥層との間に汚泥から分離して生成してくる脱離液を抜き出す返送管ｆを設けて、その返送管ｆを生物処理槽ｄに連通し、かつ、生物処理槽ｄの溢流口６０を溢流管６１を介し沈澱槽ｅに連通して、汚泥濃縮貯留槽ｃに貯留した汚泥から分離してくる脱離液が、計量槽ｂを経ずに、汚泥濃縮貯留槽ｃから生物処理槽ｄと沈澱槽ｅとを経て汚泥濃縮貯留槽ｃに戻るよう循環するようにしたことを特徴とする合併処理浄化装置を提起するものである。
【００１６】
また、本発明手段において、汚泥濃縮貯留槽ｃに生ずる脱離液の生物処理槽ｄへの返送は、汚泥濃縮貯留槽ｃと生物処理槽ｄと沈澱槽ｅとの三者の間において汚水の循環が行われるようにするためのものであり、この循環が行われるようになればよく、汚泥濃縮貯留槽ｃに生じた脱離液の全てが生物処理槽ｄに返送されるようにする必要はなく、一部が流量調整槽ａに戻るようになっていてもよい。
【００１７】
このことから、本発明においては、請求項２に記載した、汚泥濃縮貯留槽ｃに、そこに生成してくる脱離液を生物処理槽ｄに返送する返送管ｆと流量調整槽ａに溢流させる返送管１とを装備せしめることを特徴とする請求項１記載の合併処理浄化装置を、併せて提起するものである。
【００１８】
この手段は、既設の合併処理浄化装置に、それの汚泥濃縮貯留槽ｃにおいて生ずる脱離液を生物処理槽ｄに返送する返送管ｆを装設して、本発明手段による合併処理浄化装置Ａを構成するよう改造するときの施工を容易にする利益が得られる。
【００１９】
【発明の実施の形態】
次に本発明の実施の態様を説明する。
図３は、本発明手段による合併処理浄化装置Ａの縦断した展開図で、同図において、Ｌ１は汚水が供給される供給ライン、ａは供給される汚水を受け入れる流量調整槽、Ｐ１は流量調整槽ａから汚水を汲み上げる水中ポンプなどよりなる移送ポンプ、ｂは汲み上げた汚水を所望の流量に調整して移送管２に流出させる計量槽、ｄは計量槽ｂから移送管２により流出してくる汚水を受け入れて、生物処理を行わす生物処理槽、ｅは生物処理が行われて生物処理槽ｄから溢流する汚水を受け入れ、汚水中の汚泥を沈降分離せしめる沈澱槽、ｃは、水中ポンプなどの引き抜きポンプＰ２により引き抜かれて移送ラインＬ２により移送される沈澱槽ｅ内に沈澱した汚泥を貯留し濃縮する汚泥濃縮貯留槽であり、これらは、従前の合併処理浄化装置のものと同様に構成してよい。
【００２０】
計量槽ｂは、手動操作による可動堰（図示省略）の作動により移送管２に流出する汚水の流量を調節する通常のものであり、オーバーフローする汚水を流量調整槽ａに戻す溢流管３が装備してある。
【００２１】
生物処理槽ｄは、微生物を坦持させた坦体４を汚水中に浮遊させるか、微生物を付着させた接触濾材を生物処理槽ｄ内に固定装設するか、坦体４または接触濾材を用いずに、送風機５０により生成する圧風を生物処理槽ｄ内に装備させる散気管５１に送給して汚水中に噴気させることでばっ気する形態のものとするなど、従前のものと同様に適宜に構成してよい。
【００２２】
この生物処理槽ｄの溢流口６０から溢流管６１を介して溢流する生物処理後の処理水を受け入れる沈澱槽ｅは、受け入れた汚水中の汚泥を重力により沈降させ、分離した処理水を、流出口７０から放流させる単純な沈澱槽ｅの形態のもの、または、槽ｅ内を二重管状に区画し、生物処理槽ｄから処理水を導く溢流管６１を内筒７１の内腔に連通し、その内筒７１と外筒７２との間に、濾材７３を固定装填し、この濾材７３の上方に前記流出口７０を配設して、濾材７３を流過した処理水が流出口７０から放流されていくようにした濾材組込型のものとするなど、従前手段のものと同様に適宜に構成してよい。
【００２３】
また、この沈澱槽ｅ内に沈澱する汚泥を引き抜く汚泥引き抜きポンプＰ２は、エアーリフト型、または、水中ポンプなどの通常のものでよく、これにより抜き上げる汚泥を汚泥濃縮貯留槽ｃに移送する移送ラインＬ２には、流量を計測する計量器８を設け、また、引き抜きポンプＰ２には、それの作動または、作動時間を制御する制御手段を設けておいて、引き抜く汚泥の量の調整が所望に設定し得るようにしておく。
【００２４】
しかして、引き抜いた汚泥を貯留する汚泥濃縮貯留槽ｃには、ここに貯留した汚泥が、沈積する重い汚泥とガスの発生により浮遊する軽い汚泥とに分離して、その中間に脱離液が生成分離してきたときに、この脱離液を外部に抽き出す返送管ｆを設けるが、この返送管ｆは、図３に示しているように、それの移送先を、生物処理槽ｄに接続して、脱離液が生物処理槽ｄの返送されるようにする。
【００２５】
そして、これにより、この汚泥濃縮貯留槽ｃにおいて汚泥から分離して生成される脱離液が、図４のフローシートにあるように、計量槽ｂを経ないで、汚泥濃縮貯留槽ｃから生物処理槽ｄおよび沈澱槽ｅを経て汚泥濃縮貯留槽ｃに戻るようこれら三者の間を循環するようにする。
【００２６】
【発明の効果】
以上説明したように、本発明による合併処理浄化装置は、沈澱槽ｅから抜き出して汚泥濃縮貯留槽ｃに貯留した汚泥から分離してくる脱離液が、計量槽ｂを経ずに、汚泥濃縮貯留槽ｃから生物処理槽ｄと沈澱槽ｅとを経て汚泥濃縮貯留槽ｃに戻るよう循環するようになることから、生物処理槽ｄに送る汚水の量を、生物処理の処理能力にあわせた流量に設定しておけば、沈澱槽ｅからの汚泥の引き抜き量を沈澱槽ｅにおける汚泥の沈降状況に応じて変更しても、生物処理槽ｄに送る汚水の流量をそのままにしておいてよいので、調整・管理が著しく容易になる。
【図面の簡単な説明】
【図１】従前の合併処理浄化装置の縦断した展開図である。
【図２】同上装置の汚水処理行程のフローシートである。
【図３】本発明手段による合併処理浄化装置の縦断した展開図である。
【図４】同上の装置の汚水の処理行程のフローシートである。
【符号の説明】
Ａ…合併処理浄化装置、ａ…流量調整槽、ｂ…計量槽、ｃ…汚泥濃縮貯留槽、ｄ…生物処理槽、ｅ…沈澱槽、ｆ…返送管、Ｐ１…移送ポンプ、Ｐ２…引き抜きポンプ、Ｌ１…供給ライン、Ｌ２…移送ライン、１…返送管、２…移送管、３…溢流管、４…坦体、５０…送風機、５１…散気管、６０…溢流口、６１…溢流管、７０…流出口、７１…内筒、７２…外筒、７３…濾材、８…計量器。[0001]
[Technical field to which the invention belongs]
The present invention relates to sewage purification treatment means for purifying sewage by biological treatment.
More specifically, a flow rate adjustment tank that accepts supplied sewage, adjusts it to a constant flow rate, and sends it out, and a biological treatment that purifies the sewage sent out by a carrier carrying microorganisms or by aeration. Combined processing from a tank, a sedimentation tank that precipitates and separates sludge from the treated sewage, and a sludge concentration storage tank that extracts and stores and concentrates the sludge deposited in the precipitation tank at all times or at regular intervals. It is related with improvement about a purification device.
[0002]
[Prior art]
Combined treatment purification system, usually, as shown in FIG. 1, the metering and flow regulation tank a is connected to the supply line L 1 of the sewage, the sewage to be pumped from where the pump P at a constant flow delivery A sewage measurement tank b, a biological treatment tank d that receives sewage that has been metered to a predetermined flow rate, a sedimentation tank e that precipitates and separates sludge from the treated water, and a settling tank e. It is comprised with the sludge concentration storage tank c which draws out the stored sludge regularly or intermittently, and stores and concentrates it.
[0003]
And the sewage supplied from the supply line L1 is sent to the measuring tank b by the transfer pump P such as a submersible pump from the flow rate adjusting tank a, adjusted to a constant outflow amount from there, and sent to the biological treatment tank d. , Contact with a carrier or a filter medium carrying microorganisms, or perform biological treatment by aeration, sequentially transfer the treated wastewater to the sedimentation tank e, and transfer it to the sedimentation tank e. The sludge is settled by gravity, and the deposited sludge is withdrawn constantly or intermittently and transferred to the sludge concentration storage tank c by the transfer line L2, where it is separated into heavy sludge and light sludge containing gas. The desorbed intermediate desorbed liquid is returned to the flow rate adjusting tank a by the desorbed liquid return pipe 1.
[0004]
And thereby, the sewage supplied from the supply line L1 to the flow rate adjustment tank a is sent from the flow rate adjustment tank a to the biological treatment tank d via the measurement tank b, as shown in the flow sheet of FIG. From there, it is transferred to the sedimentation tank e, the sludge that settles there is pulled out and transferred to the sludge concentration storage tank c, and the separation liquid separated there is returned to the flow rate adjustment tank a, and the biological water from the measurement tank b is returned again with the sewage. It is circulated so as to be supplied to the treatment tank d, and during this circulation, the supernatant liquid separated from the settling sludge is overflowed and discharged as treated water in the precipitation tank e, or further passed through the disinfection tank, Discharge as treated water of specified standards.
[0005]
Also, the sludge in the sludge concentration storage tank c that gradually accumulates during this circulation is removed to the outside by pulling it out with a baquium wheel periodically performed at a predetermined interval. Purification by biological treatment is performed.
[0006]
[Problems to be solved by the invention]
The combined treatment purification device adjusts the amount of sewage supplied to the flow rate adjustment tank a to the biological treatment tank d after adjusting the outflow amount by the measurement tank b, and sequentially overflows the treated water biologically treated in the sedimentation tank e. In this settling tank e, heavy sludge is precipitated, and the sludge is withdrawn constantly or intermittently and transferred to the sludge concentration storage tank c by the transfer line L2, where heavy sludge and light sludge containing gas are used. The separation liquid generated in the middle is returned to the flow rate adjustment tank a by the return pipe 1 and is circulated to return to the biological treatment tank d again through the measuring tank b. During this circulation, Since the supernatant treated water separated from the sludge settled in the sedimentation tank e is discharged sequentially, the flow rate of the sewage sent from the measuring tank b to the biological treatment tank d and the sludge concentration storage tank c drawn from the sedimentation tank e The amount of sludge to return to If appropriately adjusted, the biological treatment of the wastewater in the biological treatment tank d and the overflow discharge of the treated water from the sedimentation tank e are performed appropriately, and the wastewater is discharged as treated water of a predetermined standard. Will come.
[0007]
In this combined treatment purification device, the flow rate of the sewage supplied from the measuring tank b to the biological treatment tank d and the return amount of the sludge extracted from the sedimentation tank e and returned to the sludge concentration storage tank c are maintained and managed appropriately. This is an important condition for operating the facility so that biological treatment works effectively.
[0008]
This is because if the amount of sewage supplied from the measuring tank b is large, the amount of sewage overflowing from the biological treatment tank d to the settling tank e will increase, and separation by sedimentation of sludge in the settling tank e will occur. Since it is discharged from the sedimentation tank e without being sufficiently performed, the extraction amount must be increased by increasing the frequency of extraction from the precipitation tank e. If it does so, circulation of sewage will become quick, the residence time in the biological treatment tank d of sewage will become short, and the efficiency of biological treatment will fall. In addition, if the amount of outflow from the measuring tank b is reduced, the amount of withdrawal from the sedimentation tank e is reduced, and the amount of sewage to be circulated is reduced, then gas is generated as the sludge settled in the sedimentation tank e becomes old. This is because floating sludge is generated, which flows out with the discharged water and deteriorates the quality of the discharged water. Therefore, the control of the adjustment of the supply amount of sludge and the extracted amount of sludge is It becomes an important requirement for the operation and operation of the merger processing and purification equipment.
[0009]
However, the maintenance management of the operation and operation of the combined treatment purification apparatus is, for example, that the activity of microorganisms in the biological treatment tank d changes due to fluctuations in temperature and temperature. The situation and the sedimentation state of the sludge in the sedimentation tank e must be performed by man-control while visually monitoring. For this reason, this maintenance in the merger processing and purification apparatus is extremely troublesome.
[0010]
The present invention has been made in order to solve troublesome and troublesome problems that have occurred in the conventional merger processing purification apparatus, and provides a new means for simplifying the maintenance. For the purpose.
[0011]
[Means for Solving the Problems]
The present invention has been made based on knowledge obtained through various trials and errors in order to achieve the above-described object.
[0012]
That is, in the conventional means, in the sludge concentration storage tank c that is extracted from the sedimentation tank e and stores sludge, the desorbed liquid separated from the sludge is overflowed so as to return to the flow rate adjustment tank a. The amount of sewage supplied to the biological treatment tank d and the amount of sludge withdrawn from the settling tank e are set so that the outflow / release of the treated water from the settling tank e is maintained at an appropriate water quality. However, the balance of the water levels of the biological treatment tank d and the sedimentation tank e should be balanced while watching the sludge treatment status in the precipitation tank e and the biological treatment tank d. I must.
[0013]
In addition, if the flow rate of sewage from the measuring tank b to the biological treatment tank d is increased, the amount of sludge drawn from the sedimentation tank e must be increased accordingly. The residence time of sewage is shortened and biological treatment does not function effectively.
[0014]
Therefore, the effluent generated in the sludge concentration storage tank c is returned to the biological treatment tank d by the return pipe f, and the sludge concentration storage tank c, the biological treatment tank d, and the sediment are not passed through the measurement tank b. When the amount of the sludge precipitated in the sedimentation tank e increases, the sludge is returned to the biological treatment tank d as a desorbed liquid. By circulating to the tank e, the water level of the biological treatment tank d is maintained at a predetermined level, and by circulating, the residence time in the biological treatment tank d is not shortened, and the function of biological treatment is not impaired. As a result, it was only necessary to adjust the amount of sludge extracted by looking at the state of sludge sedimentation in the sedimentation tank e, and the result was that maintenance could be performed simply without performing various operations. .
[0015]
And from this, in the present invention, as means for achieving the above-mentioned object, the supply line L1 to which sewage is supplied and the flow rate adjusting tank a for receiving the supplied sewage , as described in claim 1, , A transfer pump P1 that pumps up sewage from the flow rate adjustment tank a, a measuring tank b that adjusts the sewage pumped up by the transfer pump P1 to a desired flow rate, and flows it out to the transfer pipe 2, and flows out from the measurement tank b through the transfer pipe 2 A biological treatment tank d that accepts incoming sewage and performs biological treatment; a sedimentation tank e that accepts sewage overflowing from the biological treatment tank d and separates and separates sludge in the sewage and discharges the supernatant from the outlet 70; Pulls out sludge settled in the settling tank e and transfers it through the transfer line L2, and accepts, stores and concentrates the sludge settling in the settling tank e drawn by the draw pump P2. In the combined treatment and purification apparatus A consisting of the sludge concentration storage tank c, the sludge concentration storage tank without passing through the measuring tank b at the front end side of the transfer line L2 for transferring the precipitated sludge extracted from the precipitation tank e by the extraction pump P2. The sludge concentration storage tank c communicates with c, and is separated from the sludge between the heavy sludge layer that settles at the bottom and the light sludge layer that contains gas floating on the top surface. A return pipe f for extracting the separated liquid is provided, the return pipe f communicates with the biological treatment tank d, and the overflow port 60 of the biological treatment tank d communicates with the sedimentation tank e via the overflow pipe 61, The desorbed liquid separated from the sludge stored in the sludge concentration storage tank c passes from the sludge concentration storage tank c to the sludge concentration storage tank c through the biological treatment tank d and the sedimentation tank e without passing through the measurement tank b. also back as it was circulated to raise combined treatment purifying apparatus according to claim It is.
[0016]
Further, in the means of the present invention, the return of the effluent generated in the sludge concentration storage tank c to the biological treatment tank d is performed between the sludge concentration storage tank c, the biological treatment tank d, and the sedimentation tank e. The circulation is performed, and it is only necessary that the circulation is performed, and it is necessary to return all of the desorbed liquid generated in the sludge concentration storage tank c to the biological treatment tank d. However, a part may return to the flow rate adjustment tank a.
[0017]
Therefore, in the present invention, the sludge concentration storage tank c described in claim 2 overflows into the return pipe f and the flow rate adjustment tank a for returning the desorbed liquid generated therein to the biological treatment tank d. The combined processing and purifying apparatus according to claim 1, which is equipped with a return pipe 1 to be flowed, is also proposed.
[0018]
This means is provided with a return pipe f for returning the desorbed liquid generated in the sludge concentration storage tank c to the biological treatment tank d in the existing merger purification apparatus A, and the combined treatment purification apparatus A according to the present invention means. The advantage of facilitating the construction when remodeling to constitute the structure is obtained.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described.
FIG. 3 is a longitudinal development view of the combined treatment purification apparatus A according to the means of the present invention, in which L1 is a supply line to which sewage is supplied, a is a flow rate adjusting tank for receiving the supplied sewage, and P1 is a flow rate adjustment. A transfer pump comprising a submersible pump that pumps sewage from the tank a, b is a measuring tank that adjusts the pumped sewage to a desired flow rate and flows out to the transfer pipe 2, and d flows out from the measurement tank b through the transfer pipe 2. A biological treatment tank that receives sewage and performs biological treatment, e is a sedimentation tank that accepts sewage that is biologically treated and overflows from the biological treatment tank d, and settles and separates sludge in the sewage, and c is a submersible pump. These are sludge concentration storage tanks for storing and concentrating sludge precipitated in the precipitation tank e drawn by the drawing pump P2 and transferred by the transfer line L2. It may be configured in the same manner as the.
[0020]
The measuring tank b is a normal one that adjusts the flow rate of sewage flowing out to the transfer pipe 2 by the operation of a movable weir (not shown) by manual operation, and the overflow pipe 3 that returns the overflowing sewage to the flow rate adjusting tank a is provided. Equipped.
[0021]
In the biological treatment tank d, the carrier 4 carrying the microorganisms is suspended in the sewage, or the contact filter medium to which the microorganisms are attached is fixedly installed in the biological treatment tank d, or the carrier 4 or the contact filter medium is used. As in the conventional case, the compressed air generated by the blower 50 is not used, but is supplied to the diffuser pipe 51 installed in the biological treatment tank d and blown into the sewage. You may comprise suitably.
[0022]
The sedimentation tank e that receives the treated water after the biological treatment that overflows from the overflow port 60 of the biological treatment tank d through the overflow pipe 61 settles the sludge in the received sewage by gravity and separates the treated water. In the form of a simple sedimentation tank e that discharges from the outlet 70, or an overflow pipe 61 that divides the inside of the tank e into a double tube and guides treated water from the biological treatment tank d. The filter medium 73 is fixedly loaded between the inner cylinder 71 and the outer cylinder 72 and communicated with the cavity, and the outlet 70 is disposed above the filter medium 73 so that the treated water that has passed through the filter medium 73 is passed through. A filter medium built-in type that is discharged from the outlet 70 may be appropriately configured in the same manner as the conventional means.
[0023]
Further, the sludge extraction pump P2 for extracting the sludge that settles in the settling tank e may be an ordinary one such as an air lift type or a submersible pump, and this transfers the sludge to be extracted to the sludge concentration storage tank c. The line L2 is provided with a measuring device 8 for measuring the flow rate, and the extraction pump P2 is provided with a control means for controlling the operation or operation time thereof, so that adjustment of the amount of sludge to be extracted is desired. Be ready to set.
[0024]
Thus, in the sludge concentration storage tank c for storing the extracted sludge, the sludge stored here is separated into heavy sludge that deposits and light sludge that floats due to the generation of gas, and the desorbed liquid is in the middle. When the product is separated, a return pipe f for extracting the desorbed liquid to the outside is provided. As shown in FIG. 3, this return pipe f is transferred to the biological treatment tank d. Connect so that the desorbed liquid is returned to the biological treatment tank d.
[0025]
As a result, as shown in the flow sheet of FIG. 4, the desorbed liquid generated by separation from the sludge in the sludge concentration storage tank c does not pass through the measurement tank b, and the living thing from the sludge concentration storage tank c. It circulates among these three so that it may return to the sludge concentration storage tank c through the processing tank d and the sedimentation tank e.
[0026]
【The invention's effect】
As described above, the combined treatment purification apparatus according to the present invention is configured so that the detachment liquid separated from the sludge extracted from the sedimentation tank e and stored in the sludge concentration storage tank c does not pass through the measurement tank b. Since it circulates from the storage tank c through the biological treatment tank d and the sedimentation tank e to return to the sludge concentration storage tank c, the amount of sewage sent to the biological treatment tank d is adjusted to the treatment capacity of the biological treatment. If the flow rate is set, even if the amount of sludge withdrawn from the sedimentation tank e is changed according to the state of sludge sedimentation in the sedimentation tank e, the flow rate of the sewage sent to the biological treatment tank d may be left as it is. As a result, adjustment and management are significantly facilitated.
[Brief description of the drawings]
FIG. 1 is a longitudinal development view of a conventional merger processing purification apparatus.
FIG. 2 is a flow sheet of a sewage treatment process of the apparatus.
FIG. 3 is a longitudinal development view of a merger processing purification apparatus according to the means of the present invention.
FIG. 4 is a flow sheet of a sewage treatment process of the apparatus described above.
[Explanation of symbols]
A ... merger treatment purification device, a ... flow rate adjustment tank, b ... metering tank, c ... sludge concentration storage tank, d ... biological treatment tank, e ... sedimentation tank, f ... return pipe, P1 ... transfer pump, P2 ... extraction pump , L1 ... supply line, L2 ... transfer line, 1 ... return pipe, 2 ... transfer pipe, 3 ... overflow pipe, 4 ... carrier, 50 ... blower, 51 ... aeration pipe, 60 ... overflow port, 61 ... overflow Flow tube, 70 ... outlet, 71 ... inner cylinder, 72 ... outer cylinder, 73 ... filter material, 8 ... meter.

Claims

汚水が供給される供給ラインＬ１と、供給される汚水を受け入れる流量調整槽ａと、流量調整槽ａから汚水を汲み上げる移送ポンプＰ１と、移送ポンプＰ１で汲み上げた汚水を所望の流量に調整して移送管２に流出させる計量槽ｂと、計量槽ｂから移送管２を経て流出してくる汚水を受け入れて生物処理を行う生物処理槽ｄと、生物処理槽ｄから溢流する汚水を受け入れて汚水中の汚泥を沈降分離せしめ上澄みを流出口７０から放流する沈澱槽ｅと、沈澱槽ｅ内に沈澱する汚泥を引き抜いて移送ラインＬ２により移送する引き抜きポンプＰ２と、引き抜きポンプＰ２で引き抜かれる沈澱槽ｅに沈澱した汚泥を受け入れて貯留し濃縮する汚泥濃縮貯留槽ｃと、からなる合併処理浄化装置Ａにおいて、沈澱槽ｅから引き抜きポンプＰ２で引き抜く沈澱した汚泥を移送する移送ラインＬ２の先端側を、計量槽ｂを経ずに汚泥濃縮貯留槽ｃに連通し、汚泥濃縮貯留槽ｃには、それの底に沈降する重い汚泥の層と上面に浮遊してくるガスを含む軽い汚泥層との間に汚泥から分離して生成してくる脱離液を抜き出す返送管ｆを設けて、その返送管ｆを生物処理槽ｄに連通し、かつ、生物処理槽ｄの溢流口６０を溢流管６１を介し沈澱槽ｅに連通して、汚泥濃縮貯留槽ｃに貯留した汚泥から分離してくる脱離液が、計量槽ｂを経ずに、汚泥濃縮貯留槽ｃから生物処理槽ｄと沈澱槽ｅとを経て汚泥濃縮貯留槽ｃに戻るよう循環するようにしたことを特徴とする合併処理浄化装置。 A supply line L1 to which sewage is supplied, a flow rate adjustment tank a that receives the supplied sewage, a transfer pump P1 that pumps sewage from the flow rate adjustment tank a, and sewage pumped by the transfer pump P1 is adjusted to a desired flow rate. A measuring tank b that flows out to the transfer pipe 2, a biological treatment tank d that receives the sewage flowing out from the measuring tank b through the transfer pipe 2 and performs biological treatment, and a sewage that overflows from the biological treatment tank d The sedimentation tank e that separates and separates sludge in the sewage and discharges the supernatant from the outlet 70, the extraction pump P2 that extracts the sludge that settles in the precipitation tank e and transfers it by the transfer line L2, and the precipitation that is extracted by the extraction pump P2. In a combined treatment and purification apparatus A comprising a sludge concentration storage tank c for receiving, storing and concentrating sludge precipitated in the tank e, the sludge is extracted from the precipitation tank e by a pump P2. The leading end side of the transfer line L2 for transferring the sludge is communicated with the sludge concentration storage tank c without passing through the measuring tank b, and the sludge concentration storage tank c has a heavy sludge layer and an upper surface that settles on the bottom thereof. A return pipe f for extracting the desorbed liquid separated from the sludge and the light sludge layer containing the gas floating on the pipe, communicating the return pipe f with the biological treatment tank d, and The effluent separated from the sludge stored in the sludge concentration storage tank c through the overflow port 60 of the biological treatment tank d through the overflow pipe 61 to the sedimentation tank e does not pass through the measurement tank b. In addition, the combined treatment purification apparatus is configured to circulate from the sludge concentration storage tank c to the sludge concentration storage tank c through the biological treatment tank d and the sedimentation tank e .