JP4256734B2

JP4256734B2 - Aeration tank equipment for waste liquid treatment

Info

Publication number: JP4256734B2
Application number: JP2003206573A
Authority: JP
Inventors: 好則鶴見
Original assignee: Fuji Jukogyo KK
Current assignee: Subaru Corp
Priority date: 2003-08-07
Filing date: 2003-08-07
Publication date: 2009-04-22
Anticipated expiration: 2023-08-07
Also published as: JP2005052704A

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば工場等において機械加工製品の洗浄や加工時に使用された洗浄液、切削油、潤滑油等の含油廃液を処理する廃液処理用曝気槽設備に関する。
【０００２】
【従来の技術】
従来の廃液処理用曝気槽設備として、例えば図３に示すようなものが知られている。この曝気槽設備は、曝気槽室５１およびブロア室５２を有している。廃液である処理用水を導入管５３を介して曝気槽室５１内の曝気槽５４に導入し、ブロア室５２内でブロア５５およびこれを駆動するモータ５６を有する圧縮エア生成装置により圧縮エアを生成して、この圧縮エアを送気管５７を介して曝気槽５４の底部から曝気することにより曝気槽水を攪拌し、曝気槽５４内で微生物により浄化する。浄化された処理水は、分離膜５８を介してポンプ５９により吸引して送水管６０を通して曝気槽室５１の外部に放出するようにしている。なお、ブロア室５２には、外気取り込み用の開閉自在なギャラリ６１が設けられており、このギャラリ６１から導入される外気をブロア５５の吸引口５５ａから吸引して圧縮エアを生成するようにしている。
【０００３】
また、従来の廃液処理設備として、図４に示すようなものも知られている。この処理設備では、含油廃液７１を受水槽７２に導入して熱交換器７３で加温した後、スクリーン導入配管７４を経てスクリーン７５に導入して固形物７６とろ過水７７とに分離する。ここで分離されたろ過水７７を貯留槽７８に貯留した後、処理部７９において生物学的処理あるいは物理化学的処理を行って処理水８０を得ると共に、この処理部７９内あるいは処理部７９内の処理水８０に浸漬して熱交換器８１を設置して温水８２を得る。この温水８２を受水槽７２の熱交換器７３に導入して受水槽７２内の含油廃液７１を加温して含油廃液７１中の油脂を液化させ、これにより含油廃液７１の粘度を低下させてスクリーン７５の目詰まりを防止するようにしている。なお、熱交換器７３を経由した水８３は、必要に応じて冷却塔８４で余剰の熱を発散させた後、熱交換器８１に循環させている（例えば、特許文献1参照）。
【０００４】
【特許文献１】
特開平６−７１２４８号公報（段落００１２〜００１３、図１）
【０００５】
【発明が解決しようとする課題】
ところが、図３に示した曝気槽設備では、曝気槽室５１とブロア室５２とを雰囲気的に完全に分離し、曝気槽室５１においては曝気槽水から放出される熱を曝気槽室５１から外部に自然放熱させ、ブロア室５２においては外気を導入して曝気用の圧縮エアを生成するようにしている。
【０００６】
このため、特に外気温度が低下すると、曝気槽水が低温の圧縮エアによって曝気されるために、水温が低下して微生物の活性化が阻害され、処理用水の浄化効率が低下することが懸念される。
【０００７】
その対策として、例えばボイラや電気ヒータ等の動力設備を設置して、曝気槽水を間接的に加温することが考えられるが、この場合には、大型の動力設備を要するため、設備費が嵩むと共に、燃料や電力等の維持費が大幅に増大することが懸念される。
【０００８】
また、図４に示した特許文献１に開示の廃液処理設備にあっては、２個の熱交換器７３、８１と、これら熱交換器７３と８１との間で媒体を循環させる移送ポンプとを要するため、設備費や電力等の維持費がかかることが懸念されると共に、処理部７９での処理水８０の温度が低下した場合には、受水槽７２内の含油廃液７１を全く加温できないため、初期の目的を達成できなくなる。
【０００９】
なお、この特許文献１に開示の技術を図３に示した曝気槽設備に適用して、曝気槽５４から吸引される処理水に浸漬して熱交換器を設置すると共に、曝気槽５４に導入させる処理用水に浸漬して熱交換器を設置し、両者の熱交換器を移送ポンプを介して連結して、処理水の熱により曝気槽５４に導入させる処理用水を加温することが考えられる。しかし、この場合も、図４の場合と同様に、２個の熱交換器および移送ポンプを要するため、設備費や電力等の維持費がかかることが懸念されると共に、処理水の温度が低下した場合には処理用水を全く加温できないことになる。
【００１０】
従って、かかる点に鑑みてなされた本発明の目的は、簡単かつ安価な構成で、外気温度が低下しても曝気槽水中の微生物を確実に活性化できて廃液を効率よく浄化処理できる廃液処理用曝気槽設備を提供することにある。
【００１１】
【課題を解決するための手段】
上記目的を達成する請求項１に記載の廃液処理用曝気槽設備の発明は、廃液を浄化する曝気槽を有する曝気槽室と、圧縮エア生成装置を有するブロア室とを備え、上記圧縮エア生成装置で生成された圧縮エアを送気管を介して上記曝気槽に送気して曝気し、上記曝気槽で浄化処理された処理水を送水管を介して上記曝気槽室から外部に放出するようにした廃液処理用曝気槽設備において、上記ブロア室を外気から遮断すると共に、上記曝気槽室と上記ブロア室とを熱循環ダクトを介して連結し、上記圧縮エア生成装置の駆動により、上記曝気槽室の内気を圧縮エアのエア源として上記熱循環ダクトを通して上記ブロア室に導入して循環させると共に、上記ブロア室に導入されるエア源の酸素濃度を計測する酸素濃度センサと、上記曝気槽室に連結した外気導入ダクトと、上記外気導入ダクトを通して上記曝気槽室に外気を導入する外気導入装置と、上記送水管を介して上記曝気槽室の外部に放出される処理水により、上記外気導入ダクトを通して上記曝気槽室に導入される外気を加温する熱交換器と、上記熱循環ダクトの内気入口側の酸素濃度が所定の濃度範囲にあるように、上記酸素濃度センサの出力に基づいて上記外気導入装置の駆動を制御する制御装置とを設けたことを特徴とする。
【００１２】
請求項１の発明によると、ブロア室が外気から遮断されているので、圧縮エア生成装置を駆動するとブロア室内が負圧となって、曝気槽室の内気が熱循環ダクトを通してブロア室に圧縮エアのエア源として導入され、さらにブロア室において圧縮エア生成装置の自己発熱によって加温されて循環されることになる。従って、外気温度が低下しても圧縮エアの温度は高く維持され、その曝気によって曝気槽水が加温される。
【００１４】
さらに、ブロア室に導入されるエア源の酸素濃度が所定の濃度範囲から低下すると、外気導入装置により外気導入ダクトおよび熱交換器を介して外気が加温されて曝気槽室に導入され、エア源の酸素濃度が所定の濃度範囲を超えると、外気導入装置による外気導入が停止されるので、曝気する圧縮エアの温度を低下させることなく、その酸素濃度を所定の濃度範囲に維持することが可能となる。これにより曝気槽水中の微生物を安定して活性化することができるので、廃液を効率よく浄化処理することが可能となる。
【００１５】
請求項２に記載の発明は、請求項１の廃液処理用曝気槽設備において、上記外気導入ダクトには、上記熱交換器を通る外気加温通路と、該外気加温通路をバイパスするバイパス通路と、上記外気加温通路または上記バイパス通路を選択するバルブと、該バルブを駆動するアクチュエータとを設け、上記曝気槽室には室内温度を計測する温度センサを設け、上記曝気槽室の温度が所定の温度範囲にあるように、上記温度センサの出力に基づいて上記制御装置により上記アクチュエータを介して上記バルブの駆動を制御して、上記外気加温通路または上記バイパス通路を選択することを特徴とする。
【００１６】
請求項２の発明によると、外気導入装置により外気を導入する際、曝気槽室の温度が所定の温度範囲から低下すると、外気加温通路を通して外気が熱交換器により加温されて曝気槽室に導入される一方、曝気槽室の温度が所定の温度範囲を超えると、バイパス通路を通して外気が直接曝気槽室に導入される。しかも、バイパス通路を通して導入された外気は、熱循環ダクトに導入されるまでに曝気槽室の熱で加温されるので、曝気する圧縮エアの温度を所定の温度範囲に維持することが可能となり、これにより曝気槽水中の微生物をより安定して活性化することができ、廃液をより効率よく浄化処理することが可能となる。
【００１７】
請求項３に記載の発明は、請求項１または２の廃液処理用曝気槽設備において、上記外気導入ダクトは、上記曝気槽室の上記熱循環ダクトの連結部とほぼ対向する部分に連結することを特徴とする。
【００１８】
請求項３の発明によると、外気導入ダクトを、曝気槽室の熱循環ダクトの連結部とほぼ対向する部分に連結することによって、外気を効率的に熱循環ダクトに導入されるまでに曝気槽室の熱で加温できる。
【００１９】
請求項４に記載の発明は、請求項１〜３のいずれか１項の廃液処理用曝気槽設備において、少なくとも上記熱循環ダクトを断熱材により外気から断熱したことを特徴とする。
【００２０】
請求項４の発明によると、外気温度が低下しても、熱循環ダクトを通してブロア室に導入される曝気槽室の内気の温度低下を確実に防止することが可能となる。
【００２１】
請求項５に記載の発明は、請求項１〜４のいずれか１項の廃液処理用曝気槽設備において、上記曝気槽室の外壁および／または屋根に太陽熱を吸収する採光性部材を設けたことを特徴とする。
【００２２】
請求項５の発明によると、採光性部材による太陽熱の吸収によって曝気槽室の内気が加温されるので、曝気する圧縮エアの温度低下および曝気槽水の温度低下をより確実に防止することが可能となる。
【００２３】
【発明の実施の形態】
以下、本発明による廃液処理用曝気槽設備の実施の形態について、図１および図２を参照して説明する。
【００２４】
図１は廃液処理用曝気槽設備の構成を示す図であり、図２は熱循環ダクトの構成を示す斜視図である。
【００２５】
図１に示す曝気槽設備は、上記図３に示した曝気槽設備と同様に、曝気槽室１およびブロア室２を有しており、廃液である処理用水を導入管３を介して曝気槽室１内の曝気槽４に導入する一方、ブロア室２内でブロア５およびこれを駆動するモータ６を有する圧縮エア生成装置により圧縮エアを生成して、この圧縮エア噴出孔７ａが開口する送気管７を介して曝気槽４の底部から曝気し、曝気槽４内で微生物により浄化された処理水は、分離膜８を介してポンプ９により吸引して送水管１０を通して曝気槽室１の外部に放流するようになっている。
【００２６】
本実施の形態では、ブロア室２を外気から遮断すると共に、曝気槽室１の内気をブロア室２に導入可能に、曝気槽室１とブロア室２とを熱循環ダクト１１を介して連結する。また、熱循環ダクト１１の内気入口側には、酸素濃度センサ１２を取り付けて、熱循環ダクト１１に導入される内気の酸素濃度を計測すると共に、曝気槽室１には温度センサ１３を取り付けて、曝気槽室１の室内温度を計測し、それらの計測値を制御装置１４に供給する。
【００２７】
さらに、曝気槽室１には、熱循環ダクト１１を連結した位置とほぼ対向する位置に外気導入ダクト１５を連結する。この外気導入ダクト１５を通して曝気槽室１に外気を導入可能にブロア１６およびこれを駆動するモータ（図示せず）を有する外気導入装置を設け、この外気導入装置を、酸素濃度センサ１２による酸素濃度の計測値が所定の濃度範囲に維持されるように制御装置１４により駆動制御する。
【００２８】
また、外気導入ダクト１５には、送水管１０を介して曝気槽室１の外部に放出する処理水によって外気を加温する熱交換器１７を設けると共に、この熱交換器１７により外気を加温して導入する外気加温通路１８をバイパスして、外気を熱交換器１７により加温することなく導入するバイパス通路１９を形成し、これら外気加温通路１８またはバイパス通路１９を、温度センサ１３による温度計測値が所定の温度範囲にあるように、制御装置１４によりアクチュエータ２０を介して作動するフラップバルブ２１により選択するようにする。
【００２９】
なお、熱循環ダクト１１は、図２に示すように、その周囲に断熱材２５を設けて外気から断熱し、導入管３、送気管７および送水管１０の外気に晒される部分も、必要に応じて断熱材で覆って外気から断熱する。また、曝気槽室１の外壁および／または屋根には、太陽熱を吸収する採光性部材を設けて、曝気槽室１の内気を加温するようにする。
【００３０】
以下、本実施の形態による廃液処理用曝気槽設備の動作を説明する。
【００３１】
ブロア室２の圧縮エア生成装置を駆動すると、ブロア室２が外気から遮断されているので、ブロア室２内は負圧となる。これにより曝気槽室１において曝気槽室１内の処理水、即ち曝気槽水からの放熱により加温された内気が、熱循環ダクト１１を通して圧縮エアのエア源としてブロア室２に導入され、ここで圧縮エア生成装置を構成するブロア５およびモータ６の自己発熱によりさらに加温されながらブロア５の吸引口５ａから吸引されて圧縮エアが生成される。
【００３２】
ブロア室２で生成された圧縮エアは、送気管７を介して曝気槽４の底部から曝気されて曝気槽水の液面から曝気槽室１に放出される。この曝気により曝気槽水が攪拌されると同時に加温され、その加温された曝気槽水からの放熱により曝気槽室１の内気が加温されて、熱循環ダクト１１を通してブロア室２に導入され、これにより熱循環が行われる。
【００３３】
また、酸素濃度センサ１２による酸素濃度計測値が予め設定した所定の濃度範囲を下回ると、制御装置１４によりブロア１６を有する外気導入装置が駆動されて外気導入ダクト１５を通して曝気槽室１に外気が導入される。一方、酸素濃度センサ１２による酸素濃度計測値が所定の濃度範囲を超えると、外気導入装置の駆動が停止されて曝気槽室１への外気導入が停止され、これにより曝気槽水に曝気する圧縮エアの酸素濃度が所定の濃度範囲に維持される。
【００３４】
また、外気導入装置により曝気槽室１に外気を導入する際、温度センサ１３による温度計測値が予め設定した所定の温度範囲を下回ると、外気加温通路１８を選択するように、制御装置１４によりアクチュエータ２０を介してフラップバルブ２１の駆動が制御されて、外気加温通路１８を通して外気が熱交換器１７により加温されて導入される。一方、温度センサ１３による温度計測値が所定の温度範囲を超えると、バイパス通路１９を選択するようにフラップバルブ２１の駆動が制御されて、バイパス通路１９を通して外気が加温されることなく直接導入される。その直接導入された外気は、外気導入ダクト１５とほぼ対向する位置に連結されている熱循環ダクト１１に導入される間に、曝気槽室１の熱により加温される。従って、曝気槽室１の温度すなわち曝気槽水に曝気する圧縮エアの温度が所定の温度範囲に維持される。
【００３５】
このように、本実施の形態では、ボイラや電気ヒータ等の動力設備を設置して曝気槽水を間接的に加温したり、曝気槽４に導入する廃液を２個の熱交換器および移送ポンプを用いて加温したりすることなく、ブロア室２を外気から遮断すると共に、曝気槽室１とブロア室２とを熱循環ダクト１１を介して連結して、圧縮エア生成装置の駆動により曝気槽室１の内気を曝気用のエア源として循環させて曝気槽室１の熱および圧縮エア生成装置の自己発熱により曝気槽水を加温するようにしたので、簡単かつ安価に構成できる。また、外気温度が低下しても曝気槽水中の微生物を確実に活性化して廃液を効率よく浄化処理することができる。なお、ブロア室２は、外気取り込み用の開閉自在なギャラリが設けられている場合には、このギャラリを閉塞することにより、外気から簡単に遮断することができる。
【００３６】
しかも、曝気槽室１の熱循環ダクト１１の連結部とほぼ対向する部分に外気導入ダクト１５を連結して、外気導入装置により曝気槽室１に選択的に外気を導入して、曝気槽室１の酸素濃度を所定の濃度範囲に維持すると共に、その外気導入装置による外気導入の際に、曝気槽４から放出される処理水を熱源とする熱交換器１７により導入する外気を選択的に加温して、曝気槽室１の温度を所定の温度範囲に維持するようにしたので、曝気を行うエア源の酸素濃度および温度をそれぞれ所定の範囲に確実に維持することができる。従って、曝気槽水中の微生物をより安定して活性化することができ、廃液をより効率よく浄化処理することができる。
【００３７】
また、熱循環ダクト１１を断熱材２５により外気から断熱し、導入管３、送気管７および送水管１０の外気に晒される部分も、必要に応じて断熱材で外気から断熱すると共に、曝気槽室１の外壁および／または屋根に太陽熱を吸収する採光性部材を設けて曝気槽室１の内気を加温するようにしたので、曝気する圧縮エアの温度低下および曝気槽水の温度低下をより確実に防止することができる。
【００３８】
なお、本発明は上記実施の形態に限定されるものではなく、発明の趣旨を逸脱しない範囲で種々変更可能である。例えば、上記実施の形態では、熱交換器１７の熱源として、曝気槽４から放出される処理水を用いたが、処理水に代えて、曝気槽室１からの排気を熱源として利用するように構成することもできる。また、外気導入ダクト１５の取り付け位置を適宜変更したり、曝気槽室１に導入する外気の温度制御を省略したり、さらに曝気槽室１内の酸素濃度制御を省略したり、さらには外気導入そのものを省略することもできる。
【００３９】
さらに、曝気槽室１に採光性部材に代えて断熱材を設けて曝気槽室１を外気から断熱したり、あるいはこのような採光性部材や断熱材の設置を省略したりすることもできる。また、熱循環ダクト１１の断熱材２５を省略することもできる。
【００４０】
【発明の効果】
以上のように、本発明によれば、ブロア室を外気から遮断すると共に、曝気槽室とブロア室とを熱循環ダクトを介して連結し、圧縮エア生成装置の駆動により曝気槽室の内気を曝気用のエア源として循環させて、曝気槽室の熱および圧縮エア生成装置の自己発熱により曝気槽水を加温するようにしたので、簡単かつ安価に構成できると共に、外気温度が低下しても曝気槽水中の微生物を確実に活性化して廃液を効率よく浄化処理することができる。
【図面の簡単な説明】
【図１】本発明の実施の形態による廃液処理用曝気槽設備の構成を示す図である。
【図２】図１に示す熱循環ダクトの構成を示す斜視図である。
【図３】従来の廃液処理用曝気槽設備の構成を示す図である。
【図４】従来の廃液処理設備の構成を示す図である。
【符号の説明】
１曝気槽室
２ブロア室
３導入管
４曝気槽
５ブロア（圧縮エア生成装置）
５ａ吸引口
６モータ
７送気管
９ポンプ
１０送水管
１１熱循環ダクト
１２酸素濃度センサ
１３温度センサ
１４制御装置
１５外気導入ダクト
１６ブロア
１７熱交換器
１８外気加温通路
１９バイパス通路
２０アクチュエータ
２１フラップバルブ（バルブ）
２５断熱材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an aeration tank facility for waste liquid treatment for treating an oil-containing waste liquid such as a cleaning liquid, a cutting oil, and a lubricating oil used for cleaning or machining a machined product in a factory, for example.
[0002]
[Prior art]
As a conventional waste liquid treatment aeration tank facility, for example, one shown in FIG. 3 is known. This aeration tank facility has an aeration tank chamber 51 and a blower chamber 52. Waste water for treatment is introduced into the aeration tank 54 in the aeration tank chamber 51 through the introduction pipe 53, and compressed air is generated in the blower chamber 52 by the compressed air generator having the blower 55 and the motor 56 for driving the blower 55. Then, the compressed air is aerated from the bottom of the aeration tank 54 via the air supply pipe 57 to agitate the aeration tank water and purify the microorganisms in the aeration tank 54 by microorganisms. The purified treated water is sucked by the pump 59 through the separation membrane 58 and discharged to the outside of the aeration tank chamber 51 through the water supply pipe 60. The blower chamber 52 is provided with an openable and closable gallery 61 for taking in outside air. The outside air introduced from the gallery 61 is sucked from the suction port 55a of the blower 55 to generate compressed air. Yes.
[0003]
As a conventional waste liquid treatment facility, the one shown in FIG. 4 is also known. In this processing facility, the oil-containing waste liquid 71 is introduced into the water receiving tank 72 and heated by the heat exchanger 73, and then introduced into the screen 75 through the screen introduction pipe 74 to be separated into the solid substance 76 and the filtrate 77. After the filtered water 77 separated here is stored in the storage tank 78, the treatment unit 79 performs biological treatment or physicochemical treatment to obtain treated water 80, and in the treatment unit 79 or the treatment unit 79. The hot water 82 is obtained by installing the heat exchanger 81 by immersing in the treated water 80. This hot water 82 is introduced into the heat exchanger 73 of the water receiving tank 72 to heat the oil-containing waste liquid 71 in the water receiving tank 72 to liquefy the fats and oils in the oil-containing waste liquid 71, thereby reducing the viscosity of the oil-containing waste liquid 71. The screen 75 is prevented from being clogged. The water 83 that has passed through the heat exchanger 73 is circulated to the heat exchanger 81 after the excess heat is dissipated in the cooling tower 84 as necessary (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 6-71248 (paragraphs 0012 to 0013, FIG. 1)
[0005]
[Problems to be solved by the invention]
However, in the aeration tank facility shown in FIG. 3, the aeration tank chamber 51 and the blower chamber 52 are completely separated from each other in terms of atmosphere, and the heat released from the aeration tank water is transferred from the aeration tank chamber 51 to the aeration tank chamber 51. Natural heat is radiated to the outside, and outside air is introduced into the blower chamber 52 to generate compressed air for aeration.
[0006]
For this reason, especially when the outside air temperature is lowered, the aeration tank water is aerated by the low-temperature compressed air. Therefore, there is a concern that the water temperature is lowered, the activation of microorganisms is inhibited, and the purification efficiency of the treatment water is lowered. The
[0007]
As countermeasures, for example, it is conceivable to install power equipment such as a boiler or an electric heater to indirectly heat the aeration tank water. In this case, however, a large power equipment is required. In addition to increasing the volume, there is a concern that maintenance costs for fuel, power, and the like will increase significantly.
[0008]
Further, in the waste liquid treatment facility disclosed in Patent Document 1 shown in FIG. 4, two heat exchangers 73 and 81, a transfer pump that circulates a medium between the heat exchangers 73 and 81, and Therefore, when the temperature of the treated water 80 in the treatment unit 79 decreases, the oil-containing waste liquid 71 in the water receiving tank 72 is completely heated. Because it is not possible, the initial purpose cannot be achieved.
[0009]
The technique disclosed in Patent Document 1 is applied to the aeration tank facility shown in FIG. 3, soaked in treated water sucked from the aeration tank 54, installed with a heat exchanger, and introduced into the aeration tank 54. It is conceivable to heat the treatment water introduced into the aeration tank 54 by the heat of the treatment water by installing a heat exchanger immersed in the treatment water to be connected and connecting both heat exchangers via a transfer pump. . However, in this case as well, as in the case of FIG. 4, two heat exchangers and a transfer pump are required. In this case, the treatment water cannot be heated at all.
[0010]
Accordingly, an object of the present invention made in view of such points is a waste liquid treatment that can easily activate microorganisms in the aeration tank water and can efficiently purify the waste liquid with a simple and inexpensive configuration even when the outside air temperature is lowered. It is to provide an aeration tank facility.
[0011]
[Means for Solving the Problems]
The invention of an aeration tank facility for waste liquid treatment according to claim 1 that achieves the above object comprises an aeration tank chamber having an aeration tank for purifying waste liquid, and a blower chamber having a compressed air generating device, and generating the compressed air The compressed air generated by the apparatus is supplied to the aeration tank through the air supply pipe and aerated, and the treated water purified in the aeration tank is discharged from the aeration tank chamber to the outside through the water supply pipe. In the waste liquid treatment aeration tank facility, the blower chamber is blocked from outside air, and the aeration tank chamber and the blower chamber are connected via a heat circulation duct, and the aeration tank is driven by the compressed air generation device. An oxygen concentration sensor that measures the oxygen concentration of the air source that is introduced into the blower chamber through the thermal circulation duct and circulates the inside air of the tank chamber as an air source of compressed air, and the aeration tank In the room The outside air introduction duct, the outside air introduction device for introducing outside air to the aeration tank chamber through the outside air introduction duct, and the treated air discharged to the outside of the aeration tank chamber through the water pipe. Through the heat exchanger for heating the outside air introduced into the aeration tank chamber through the oxygen concentration sensor based on the output of the oxygen concentration sensor so that the oxygen concentration on the inside air inlet side of the heat circulation duct is in a predetermined concentration range And a control device for controlling driving of the outside air introduction device .
[0012]
According to the first aspect of the invention, since the blower chamber is shut off from the outside air, when the compressed air generating device is driven, the blower chamber becomes negative pressure, and the inside air in the aeration tank chamber is compressed air into the blower chamber through the thermal circulation duct. In addition, the air is heated and circulated in the blower chamber by the self-heating of the compressed air generator. Therefore, the temperature of the compressed air is kept high even when the outside air temperature is lowered, and the aeration tank water is heated by the aeration .
[0014]
Further, when the oxygen concentration of the air source introduced into the blower chamber falls from a predetermined concentration range, the outside air is heated by the outside air introduction device via the outside air introduction duct and the heat exchanger and introduced into the aeration tank chamber, and the air When the oxygen concentration of the source exceeds the predetermined concentration range, the introduction of the outside air by the outside air introducing device is stopped, so that the oxygen concentration can be maintained within the predetermined concentration range without reducing the temperature of the compressed air to be aerated. It becomes possible. Since this makes it possible to activate and stable microbial aeration tank water, it is possible to purification treatment may efficient waste.
[0015]
According to a second aspect of the invention, the waste treatment aeration tank equipment according to claim 1, in the outside air introduction duct, a bypass passage bypassing the outdoor air heating passage through the heat exchanger, the external air heating passage And a valve for selecting the outside air warming passage or the bypass passage, and an actuator for driving the valve, a temperature sensor for measuring the room temperature is provided in the aeration tank chamber, and the temperature of the aeration tank chamber is The outside air warming passage or the bypass passage is selected by controlling the drive of the valve via the actuator by the control device based on the output of the temperature sensor so as to be in a predetermined temperature range. And
[0016]
According to the invention of claim 2 , when the outside air is introduced by the outside air introduction device, if the temperature of the aeration tank chamber falls from a predetermined temperature range, the outside air is heated by the heat exchanger through the outside air heating passage. On the other hand, when the temperature of the aeration tank chamber exceeds a predetermined temperature range, outside air is directly introduced into the aeration tank chamber through the bypass passage. In addition, since the outside air introduced through the bypass passage is heated by the heat of the aeration tank chamber before being introduced into the heat circulation duct, the temperature of the compressed air to be aerated can be maintained within a predetermined temperature range. Thus, the microorganisms in the aeration tank water can be activated more stably, and the waste liquid can be purified more efficiently.
[0017]
According to a third aspect of the present invention, in the aeration tank facility for waste liquid treatment according to the first or second aspect , the outside air introduction duct is connected to a portion of the aeration tank chamber that is substantially opposite to the connection portion of the thermal circulation duct. It is characterized by.
[0018]
According to the invention of claim 3 , the outside air introduction duct is connected to the portion of the aeration tank chamber that is substantially opposite to the connection portion of the heat circulation duct, so that the outside air is efficiently introduced into the heat circulation duct. Can be heated with room heat.
[0019]
According to a fourth aspect of the present invention, in the waste liquid treatment aeration tank equipment according to any one of the first to third aspects, at least the thermal circulation duct is insulated from the outside air by a heat insulating material.
[0020]
According to the fourth aspect of the present invention, even if the outside air temperature is lowered, it is possible to reliably prevent a temperature drop of the inside air in the aeration tank chamber introduced into the blower chamber through the heat circulation duct.
[0021]
Invention of Claim 5 provided the lighting member which absorbs a solar heat in the outer wall and / or roof of the said aeration tank chamber in the aeration tank equipment for waste-liquid treatment of any one of Claims 1-4. It is characterized by.
[0022]
According to the invention of claim 5 , since the inside air of the aeration tank chamber is heated by the absorption of solar heat by the daylighting member, it is possible to more reliably prevent the temperature reduction of the aerated compressed air and the temperature reduction of the aeration tank water. It becomes possible.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of an aeration tank facility for waste liquid treatment according to the present invention will be described with reference to FIG. 1 and FIG.
[0024]
FIG. 1 is a diagram showing a configuration of an aeration tank facility for waste liquid treatment, and FIG. 2 is a perspective view showing a configuration of a heat circulation duct.
[0025]
The aeration tank facility shown in FIG. 1 has an aeration tank chamber 1 and a blower chamber 2 in the same manner as the aeration tank facility shown in FIG. 3, and the treatment water as waste liquid is introduced into the aeration tank via the introduction pipe 3. While being introduced into the aeration tank 4 in the chamber 1, compressed air is generated in the blower chamber 2 by a compressed air generator having a blower 5 and a motor 6 that drives the blower 5, and the compressed air ejection hole 7 a is opened. The treated water aerated from the bottom of the aeration tank 4 through the trachea 7 and purified by microorganisms in the aeration tank 4 is sucked by the pump 9 through the separation membrane 8 and is supplied to the outside of the aeration tank chamber 1 through the water supply pipe 10. To be released.
[0026]
In the present embodiment, the blower chamber 2 is blocked from the outside air, and the aeration tank chamber 1 and the blower chamber 2 are connected via the thermal circulation duct 11 so that the inside air of the aeration tank chamber 1 can be introduced into the blower chamber 2. . An oxygen concentration sensor 12 is attached to the inside of the heat circulation duct 11 to measure the oxygen concentration of the inside air introduced into the heat circulation duct 11, and a temperature sensor 13 is attached to the aeration tank chamber 1. The indoor temperature of the aeration tank chamber 1 is measured, and those measured values are supplied to the control device 14.
[0027]
Furthermore, an outside air introduction duct 15 is connected to the aeration tank chamber 1 at a position substantially opposite to the position where the heat circulation duct 11 is connected. An outside air introduction device having a blower 16 and a motor (not shown) that drives the blower 16 is provided so that outside air can be introduced into the aeration tank chamber 1 through the outside air introduction duct 15, and this outside air introduction device is provided with an oxygen concentration by the oxygen concentration sensor 12. Is controlled by the control device 14 so that the measured value is maintained within a predetermined concentration range.
[0028]
The outside air introduction duct 15 is provided with a heat exchanger 17 that heats the outside air with treated water discharged to the outside of the aeration tank chamber 1 through the water pipe 10, and the outside air is warmed by the heat exchanger 17. By bypassing the outside air heating passage 18 to be introduced in this way, a bypass passage 19 for introducing outside air without being heated by the heat exchanger 17 is formed, and the outside air heating passage 18 or the bypass passage 19 is connected to the temperature sensor 13. The control valve 14 is selected by the flap valve 21 that is actuated via the actuator 20 so that the temperature measurement value obtained by is in a predetermined temperature range.
[0029]
As shown in FIG. 2, the heat circulation duct 11 is provided with a heat insulating material 25 around it to insulate it from the outside air, and a portion exposed to the outside air of the introduction pipe 3, the air supply pipe 7 and the water supply pipe 10 is also necessary. Insulate from outside air by covering with heat insulating material accordingly. Further, a lighting member that absorbs solar heat is provided on the outer wall and / or the roof of the aeration tank chamber 1 so as to heat the inside air of the aeration tank chamber 1.
[0030]
Hereinafter, the operation of the waste liquid treatment aeration tank facility according to the present embodiment will be described.
[0031]
When the compressed air generating device of the blower chamber 2 is driven, the blower chamber 2 is shut off from the outside air, so that the inside of the blower chamber 2 becomes negative pressure. As a result, the treated water in the aeration tank chamber 1 in the aeration tank chamber 1, that is, the internal air heated by heat radiation from the aeration tank water, is introduced into the blower chamber 2 as an air source of compressed air through the heat circulation duct 11. The compressed air is generated by being sucked from the suction port 5a of the blower 5 while further heated by the self-heating of the blower 5 and the motor 6 constituting the compressed air generating device.
[0032]
The compressed air generated in the blower chamber 2 is aerated from the bottom of the aeration tank 4 via the air supply pipe 7 and is discharged from the liquid level of the aeration tank water to the aeration tank chamber 1. The aeration tank water is stirred and heated at the same time by this aeration, and the internal air of the aeration tank chamber 1 is heated by heat radiation from the heated aeration tank water, and is introduced into the blower chamber 2 through the thermal circulation duct 11. Thus, heat circulation is performed.
[0033]
When the measured value of oxygen concentration by the oxygen concentration sensor 12 falls below a predetermined concentration range set in advance, the outside air introduction device having the blower 16 is driven by the control device 14 so that outside air enters the aeration tank chamber 1 through the outside air introduction duct 15. be introduced. On the other hand, when the measured value of oxygen concentration by the oxygen concentration sensor 12 exceeds a predetermined concentration range, the driving of the outside air introduction device is stopped and the introduction of outside air into the aeration tank chamber 1 is stopped, thereby compressing the aeration tank water. The oxygen concentration of air is maintained within a predetermined concentration range.
[0034]
Further, when the outside air is introduced into the aeration tank chamber 1 by the outside air introduction device, the control device 14 is configured to select the outside air heating passage 18 when the temperature measurement value by the temperature sensor 13 falls below a predetermined temperature range set in advance. Thus, the drive of the flap valve 21 is controlled through the actuator 20, and the outside air is heated and introduced by the heat exchanger 17 through the outside air heating passage 18. On the other hand, when the temperature measurement value by the temperature sensor 13 exceeds the predetermined temperature range, the drive of the flap valve 21 is controlled so as to select the bypass passage 19 and the outside air is directly introduced without being heated through the bypass passage 19. Is done. The directly introduced outside air is heated by the heat of the aeration tank chamber 1 while being introduced into the heat circulation duct 11 connected to a position almost opposite to the outside air introduction duct 15. Therefore, the temperature of the aeration tank chamber 1, that is, the temperature of the compressed air that is aerated into the aeration tank water is maintained in a predetermined temperature range.
[0035]
Thus, in this Embodiment, power equipment, such as a boiler and an electric heater, is installed, the aeration tank water is heated indirectly, or the waste liquid introduced into the aeration tank 4 is transferred to two heat exchangers and transferred The blower chamber 2 is cut off from the outside air without being heated using a pump, and the aeration tank chamber 1 and the blower chamber 2 are connected via a heat circulation duct 11 to drive the compressed air generator. Since the inside air of the aeration tank chamber 1 is circulated as an air source for aeration and the aeration tank water is heated by the heat of the aeration tank chamber 1 and the self-heating of the compressed air generating device, it can be configured simply and inexpensively. Moreover, even if the outside air temperature is lowered, the microorganisms in the aeration tank water can be reliably activated and the waste liquid can be efficiently purified. In addition, when the openable / closable gallery for taking in outside air is provided, the blower chamber 2 can be easily cut off from the outside air by closing the gallery.
[0036]
In addition, the outside air introduction duct 15 is connected to a portion of the aeration tank chamber 1 that is substantially opposite to the connection portion of the heat circulation duct 11, and the outside air is selectively introduced into the aeration tank chamber 1 by the outside air introduction device. While maintaining the oxygen concentration of 1 within a predetermined concentration range, the outside air introduced by the heat exchanger 17 using the treated water released from the aeration tank 4 as a heat source when the outside air is introduced by the outside air introduction device is selectively used. Since the temperature of the aeration tank chamber 1 is maintained within a predetermined temperature range by heating, the oxygen concentration and temperature of the air source that performs aeration can be reliably maintained within the predetermined ranges. Therefore, microorganisms in the aeration tank water can be activated more stably, and the waste liquid can be purified more efficiently.
[0037]
Further, the heat circulation duct 11 is insulated from the outside air by the heat insulating material 25, and the portions of the introduction pipe 3, the air feeding pipe 7 and the water feeding pipe 10 which are exposed to the outside air are also insulated from the outside air by the heat insulating material as necessary. Since a daylighting member that absorbs solar heat is provided on the outer wall and / or roof of the chamber 1 to warm the inside air of the aeration tank chamber 1, the temperature of the aerated compressed air and the temperature of the aeration tank water are further reduced. It can be surely prevented.
[0038]
In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention. For example, in the above embodiment, the treated water discharged from the aeration tank 4 is used as the heat source of the heat exchanger 17, but instead of the treated water, the exhaust from the aeration tank chamber 1 is used as the heat source. It can also be configured. Further, the mounting position of the outside air introduction duct 15 is appropriately changed, the temperature control of the outside air introduced into the aeration tank chamber 1 is omitted, the oxygen concentration control in the aeration tank chamber 1 is further omitted, and the outside air introduction is further performed. It can be omitted.
[0039]
Further, a heat insulating material may be provided in the aeration tank chamber 1 in place of the daylighting member to insulate the aeration tank chamber 1 from the outside air, or the installation of such a daylighting member or heat insulating material may be omitted. Moreover, the heat insulating material 25 of the heat circulation duct 11 can be omitted.
[0040]
【The invention's effect】
As described above, according to the present invention, the blower chamber is blocked from the outside air, and the aeration tank chamber and the blower chamber are connected via the thermal circulation duct, and the inside air of the aeration tank chamber is removed by driving the compressed air generating device. Since it is circulated as an air source for aeration and the aeration tank water is heated by the heat of the aeration tank chamber and the self-heating of the compressed air generation device, it can be configured easily and inexpensively, and the outside air temperature is reduced. Also, the microorganisms in the aeration tank water can be reliably activated and the waste liquid can be efficiently purified.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an aeration tank facility for waste liquid treatment according to an embodiment of the present invention.
2 is a perspective view showing a configuration of a heat circulation duct shown in FIG. 1. FIG.
FIG. 3 is a diagram showing a configuration of a conventional waste liquid treatment aeration tank facility.
FIG. 4 is a diagram showing a configuration of a conventional waste liquid treatment facility.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Aeration tank room 2 Blower room 3 Introducing pipe 4 Aeration tank 5 Blower (compressed air production | generation apparatus)
5a Suction port 6 Motor 7 Air supply pipe 9 Pump 10 Water supply pipe 11 Thermal circulation duct 12 Oxygen concentration sensor 13 Temperature sensor 14 Controller 15 Outside air introduction duct 16 Blower 17 Heat exchanger 18 Outside air heating passage 19 Bypass passage 20 Actuator 21 Flap valve (valve)
25 Insulation

Claims

An aeration tank chamber having an aeration tank for purifying waste liquid, and a blower chamber having a compressed air generating device, and sending compressed air generated by the compressed air generating device to the aeration tank via an air supply pipe In the aeration tank equipment for waste liquid treatment, which aerated and treated water purified in the aeration tank is discharged from the aeration tank chamber to the outside through a water pipe,
While blocking the blower chamber from outside air, the aeration tank chamber and the blower chamber are connected via a thermal circulation duct,
By driving the compressed air generating device, the inside air of the aeration tank chamber is introduced into the blower chamber through the thermal circulation duct and circulated as an air source of compressed air ,
An oxygen concentration sensor for measuring the oxygen concentration of the air source introduced into the blower chamber;
An outside air introduction duct connected to the aeration chamber;
An outside air introduction device for introducing outside air into the aeration chamber through the outside air introduction duct;
A heat exchanger that heats the outside air introduced into the aeration tank chamber through the outside air introduction duct with treated water discharged to the outside of the aeration tank chamber via the water pipe;
And a control device that controls the driving of the outside air introduction device based on the output of the oxygen concentration sensor so that the oxygen concentration on the inside air inlet side of the heat circulation duct is in a predetermined concentration range. Aeration tank equipment for waste liquid treatment.

The outside air introduction duct includes an outside air heating passage that passes through the heat exchanger, a bypass passage that bypasses the outside air heating passage, a valve that selects the outside air heating passage or the bypass passage, and the valve is driven. And an actuator for
The aeration chamber is provided with a temperature sensor for measuring the room temperature,
Based on the output of the temperature sensor, the control device controls the driving of the valve via the actuator so that the temperature of the aeration tank chamber is within a predetermined temperature range, and the outside air heating passage or the bypass is controlled. The aeration tank equipment for waste liquid treatment according to claim 1 , wherein a passage is selected.

The outside air inlet duct, the connecting portions substantially waste processing aeration tank installation according opposed to claim 1 or 2, characterized in that connected to the portion of the heat circulation duct of the aeration tank chamber.

The aeration tank equipment for waste liquid treatment according to any one of claims 1 to 3, wherein at least the heat circulation duct is insulated from outside air by a heat insulating material.

The aeration tank equipment for waste liquid treatment according to any one of claims 1 to 4, wherein a daylighting member that absorbs solar heat is provided on an outer wall and / or a roof of the aeration tank chamber.