JP5576208B2 - 廃水処理装置及び廃水処理方法 - Google Patents
廃水処理装置及び廃水処理方法 Download PDFInfo
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- JP5576208B2 JP5576208B2 JP2010180266A JP2010180266A JP5576208B2 JP 5576208 B2 JP5576208 B2 JP 5576208B2 JP 2010180266 A JP2010180266 A JP 2010180266A JP 2010180266 A JP2010180266 A JP 2010180266A JP 5576208 B2 JP5576208 B2 JP 5576208B2
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- tank
- polyurethane foam
- wastewater
- reaction tank
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- 238000004065 wastewater treatment Methods 0.000 title claims description 64
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 101
- 239000011496 polyurethane foam Substances 0.000 claims description 101
- 238000006243 chemical reaction Methods 0.000 claims description 87
- 239000002351 wastewater Substances 0.000 claims description 74
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- 239000000126 substance Substances 0.000 description 33
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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Images
Classifications
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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
以上をまとめると、従来のFPI廃水処理技術には、それぞれ表1に示すような問題点があった。
本願発明者は、このような本発明を実際のFPI廃水処理試験の結果から生み出したものであるので、以下ではFPI廃水処理試験の内容について具体的に説明する。
なお、表3に記載されている発泡量の測定に用いたディフューザーストーン法については、非特許文献「界面化学研究会(1983)泡トラブルと消泡技術」を参照されたい。
運転27日目に1系列のみに各容積約16mLのC社のポリウレタンフォーム(PUC)を40個投入し、その15日後の処理性能を見た結果を表6に示す。
すなわち、FPI廃水とポリウレタンフォームとを接触させて、FPI廃水に含まれる有機物をポリウレタンフォームに吸着させるプロセスと、ポリウレタンフォームと活性汚泥(微生物)とを接触させて、ポリウレタンフォームに吸着されている有機物を微生物に分解させるプロセスとを組み合わせることによって、FPI廃水の実用的な生物処理が可能になることが示された。
すなわち、本発明では、廃水処理装置に係る第1の解決手段として、活性汚泥及び連結気泡を有する複数のポリウレタンフォームが予め充填されており、浸透探傷検査工程から排出される浸透検査廃水が導入されると共に内部が空気あるいは酸素で曝気される反応槽と、前記反応槽から流出する流出水が導入され、該流出水に含まれる活性汚泥を沈殿させると共に上澄水を処理水として外部に放流する沈殿槽と、前記沈殿槽にて沈殿した活性汚泥を前記反応槽へ返送する汚泥返送手段とを具備する、という手段を採用する。
〔第1実施形態〕
まず、本発明の第1実施形態について説明する。図1は、第1実施形態における廃水処理装置1の構成概略図である。この図1に示すように、第1実施形態における廃水処理装置1は、反応槽10、沈殿槽11及び汚泥返送装置12から構成されている。
反応槽10に導入されたFPI廃水は、反応槽10内を通過する間にポリウレタンフォームPcと接触し、FPI廃水中の有機物の大部分はポリウレタンフォームPcに吸着される。同時に、反応槽10内でポリウレタンフォームPcと活性汚泥Fとが接触し、ポリウレタンフォームPcの表面では有機物と微生物とがともに高濃度となり、空気供給装置10bによる酸素供給によって微生物の増殖が促されて有機物の分解が効率良く行われ、ポリウレタンフォームPcの吸着力が回復する。
次に、本発明の第2実施形態について説明する。
キューブ形状をなすポリウレタンフォームPcはFPI廃水中の有機物を吸着すると、その重みによって沈降して槽内にデッドスペースを形成することが実験経験からわかった。以下で説明する第2実施形態はその問題を解決するものである。
なお、図2(a)に示すように、処理槽20において、反応槽21の底部21aはXY平面に対して平行であるが、その両側、つまり反応槽21の側部21bと沈殿槽22の底部22aは反応槽21の底部21aに向かって傾斜している。
なお、この散気装置26の上部には、ポリウレタンフォームPcが散気装置26の隙間に入り込まないようにするための下部水平濾過構造27が水平に設置されている。
反応槽21にFPI廃水を導入すると、散気装置26から発生する気泡によって反応槽21内に上昇流Rが発生する。この上昇流Rは、水面に達すると、第1下降流D1と第2下降流D2とに分離し、両下降流はやがて反応槽21の底部21a(散気装置26の上方)に戻って上昇流Rと合流して旋回流となる。
これにより、ポリウレタンフォームPcにはFPI廃水中の有機物及び微生物が付着し、酸素供給によって微生物の増殖が促されて有機物の分解が効率良く行われ、ポリウレタンフォームPcの吸着力が回復する。
次に、本発明の第3実施形態について説明する。図4は、第3実施形態における廃水処理装置3の構成概略図である。この図4において、(a)は廃水処理装置3の側面図を示し、(b)は廃水処理装置3の平面図を示している。なお、図4において、図中に示すXYZ直交座標系を設定し、X軸方向を廃水処理装置2の幅方向、Y軸方向を奥行き方向、Z軸方向を高さ方向とする。また、XY平面は水平面と平行であると想定する。
なお、図4(a)に示すように、処理槽30において、反応槽31の底部31aはXY平面に対して平行であるが、その両側、つまり反応槽31の側部31bと沈殿槽32の底部32aは反応槽31の底部31aに向かって傾斜している。
また、処理槽30は、反応槽31の底部31aにおいて、奥行き方向(Y軸方向)に沿って延在する状態で設置された散気装置35(空気供給手段)を備えている。この散気装置35は、その設置位置から周囲に向けて空気を吹き出すことで、第2仕切り板34の内側に上昇流Rを形成するものである。散気装置35によって形成された上昇流Rは水面に達すると2方向に分離して、第1仕切り板33と第2仕切り板34との間を下降する第1下降流D1と、反応槽31の側壁に沿って下降する第2下降流D2が形成される。
反応槽31にFPI廃水を導入すると、散気装置35から発生する気泡によって反応槽31内に上昇流Rが発生する。この上昇流Rは、水面に達すると、第1下降流D1と第2下降流D2とに分離し、両下降流はやがて反応槽31の底部31a(散気装置35の上方)に戻って上昇流Rと合流して旋回流となる。
これにより、シート形状をなす各ポリウレタンフォームPsの表面にはFPI廃水中の有機物及び微生物が付着し、酸素供給によって微生物の増殖が促されて有機物の分解が効率良く行われ、ポリウレタンフォームPsの吸着力が回復する。
Claims (6)
- 活性汚泥及び連結気泡を有する複数のポリウレタンフォームが予め充填されており、浸透探傷検査工程から排出される浸透検査廃水が導入されると共に内部が空気あるいは酸素で曝気される反応槽と、
前記反応槽から流出する流出水が導入され、該流出水に含まれる活性汚泥を沈殿させると共に上澄水を処理水として外部に放流する沈殿槽と、
前記沈殿槽にて沈殿した活性汚泥を前記反応槽へ返送する汚泥返送手段と、
を具備することを特徴とする廃水処理装置。 - 前記複数のポリウレタンフォームはそれぞれ前記反応槽内で流動自在な多面体形状をなし、
前記反応槽は、前記沈殿槽への前記ポリウレタンフォームの流出を防止する濾過構造を備えることを特徴とする請求項1に記載の廃水処理装置。 - 内部空間が前記反応槽と前記沈殿槽とに区画される処理槽を具備し、
前記処理槽は、
内部空間が前記反応槽と前記沈殿槽とに区画されるように且つ両槽の底部が連通するように、上端が水面より高く、下端が前記処理槽の内壁と接しない状態で設置された第1仕切り板と、
前記第1仕切り板から前記反応槽側へ所定距離を隔てて設置されると共に、上端が水面より高く、下端が前記処理槽の内壁と接しない状態で設置され、上端から下端に向けての一定範囲に前記沈殿槽側への前記ポリウレタンフォームの流出を防止する濾過構造が形成された第2仕切り板と、
前記反応槽の底部に設置され、前記第2仕切り板の内側に上昇流が形成されるように前記反応槽の内部に空気を供給する空気供給手段と、を備え、
前記沈殿槽の底部は、前記沈殿槽にて沈殿した活性汚泥が前記反応槽の底部に返送されるように傾斜していることを特徴とする請求項2に記載の廃水処理装置。 - 前記複数のポリウレタンフォームはそれぞれシート形状をなし、前記反応槽内においてスペーサを介して一定間隔で固定配置されていることを特徴とする請求項1に記載の廃水処理装置。
- 内部空間が前記反応槽と前記沈殿槽とに区画される処理槽を具備し、
前記処理槽は、
内部空間が前記反応槽と前記沈殿槽とに区画されるように且つ両槽の底部が連通するように、上端が水面より高く、下端が前記処理槽の内壁と接しない状態で設置された第1仕切り板と、
前記第1仕切り板から前記反応槽側へ所定距離を隔てて設置されると共に、上端が水面より低く、下端が前記処理槽の内壁と接しない状態で設置された第2仕切り板と、
前記反応槽の底部に設置され、前記第2仕切り板の内側に上昇流が形成されるように前記反応槽の内部に曝気用の空気を供給する空気供給手段と、を備え、
前記沈殿槽の底部は、前記沈殿槽にて沈殿した活性汚泥が前記反応槽の底部に返送されるように傾斜していることを特徴とする請求項4に記載の廃水処理装置。 - 浸透探傷検査工程から排出される浸透検査廃水を空気あるいは酸素で曝気した状態で処理するための廃水処理方法であって、
前記浸透検査廃水と連結気泡を有するポリウレタンフォームとを接触させて、前記浸透検査廃水に含まれる有機物を前記ポリウレタンフォームに吸着させる第1工程と、
前記ポリウレタンフォームと活性汚泥とを接触させて、前記ポリウレタンフォームに吸着されている有機物を微生物に分解させる第2工程と、
を有することを特徴とする廃水処理方法。
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