JP2004195347A

JP2004195347A - Oil-water separating apparatus and oil-water separating method

Info

Publication number: JP2004195347A
Application number: JP2002366255A
Authority: JP
Inventors: Seijiro Kagawa; 征二郎香川; Katsunobu Mizobuchi; 勝信溝渕; Kunio Fujita; 邦夫藤田
Original assignee: Ishigaki Co Ltd
Current assignee: Ishigaki Co Ltd
Priority date: 2002-12-18
Filing date: 2002-12-18
Publication date: 2004-07-15
Anticipated expiration: 2022-12-18
Also published as: JP4151005B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a separation method of a granulation type in which the emulsion state of emulsified oil contained in water extracted from a gravity separation tank is destructed by adding a treating agent to do fine separation and an apparatus for the method. <P>SOLUTION: Raw water is supplied in an ascending flow to the gravity separation tank (1), oil is adhered to a netlike skeleton body (3) packed in the contact separation chamber (4) of the tank (1) and converted into oil drops, the oil drops in which buoyancy is superior to adhesion are floated from the chamber (4), and the granulated oil in the raw water is separated. Next, the emulsified oil which could not be treated in the chamber (4) is extracted from the tank (1), agitated by a line mixer (12) while being added with the treating agent, supplied to a precise separation tank after being passed through a strainer (15), and passed through a lipophilic fiber sheet (18) housed in a fine separation chamber (21) to adsorb the oil to the fibers. The oil extracted from the sheet (18) by buoyancy is floated from the chamber (21), and the granulated oil and treatment water are separated and discharged. High separation efficiency can be kept over a long time. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
この発明は、船舶等から発生するビルジ、バラスト、タンク洗浄等により、海水または水に含まれる油分を分離する油水分離方法とその分離装置に関する。
【０００２】
【従来の技術】
一般に油水分離方法として、▲１▼油と水の比重差を利用した重力分離方法。▲２▼細管通過によって油分を粗粒化するコアレッサー法。▲３▼油分を活性炭、高分子材料等に吸着させる吸着方法。▲４▼その他、気泡浮上法、生物処理法、薬剤添加による凝集分離等がある。船舶用の油水分離装置としては、船舶の動揺や設置スペース等の問題で、多層平行板を設けた重力分離部、粗粒化繊維層、吸着捕集部等を適宜組合せた方式が採用されているが、粗粒化法が主体となっている。例えば、実公平６−２１５２１号公報に記載してあるように、金属または合成樹脂の繊維で構成した油分粗粒化層と、撥水性及び撥油性の多孔質膜で構成した油分粗粒化部を組合せ、船舶におけるビルジ等を水と油分に分離する粗粒化法の油水分離装置は公知である。
【０００３】
【発明が解決しようとする課題】
これらの分離方法においては、粗分離したあとの微少油滴を分離する手段である粗粒化繊維分離層あるいは吸着捕集部は、非常に目の細かいものが使用されており、目詰りが発生して、油分を含む原水が通過する時の通過抵抗が増大する。そして、粗粒化繊維分離層あるいは吸着捕集部の通過流速が早くなり、十分に粗粒化できずに微小油滴が処理水と一緒に流出することとなり、長時間安定した処理が困難であつた。粗粒化法は１０ミクロン以下の界面活性剤により、微細な乳化状態の油水に対して処理できないのが現状である。この場合、洗浄による再生であるとか、場合によっては、交換作業を頻繁に実施する必要があった。
【０００４】
界面活性剤などにより安定化した乳化油を分離する手段としては、硫酸バンド、ＰＡＣなどの薬剤によって粗粒化する方法、アルミニウムを電極として溶解し、溶出した金属イオンによって凝集させる方法がある。これらの凝集剤は、水酸化アルミなどの固形物の発生や、薬剤の取扱い、船舶の動揺などにより、船舶用の油水分離装置としては採用ができなかった。この発明は、網様骨格体を充填した重力分離槽と親油性の繊維シートを充填した精分離槽を並設して、原水中の油分を分離する粗粒化方式の分離方法と分離装置を提供する。また、油分を分離した重力分離槽の分離水に処理剤を添加して、分離水に含まれる乳化油の乳化状態を破壊して、安定した処理ができる粗粒化方式の分離方法と分離装置を提供する。
【０００５】
【課題を解決するための手段】
この発明の要旨の油水分離方法は、油分を含んだ原水を重力分離槽に上向流で供給し、重力分離槽の接触分離室に充填した網様骨格体に油分を接着させて油滴化し、連続して供給される原水により油滴を粗大化させて、接着力より浮力が勝った油滴を接触分離室から浮上させると共に、接触分離室で処理出来なかった分離水に含まれる乳化油を重力分離槽から抜出して、乳化油の処理剤を添加しながらラインミキサーで撹拌して油分の乳化状態を解消させ、次に、この油水を精分離槽に上向流で供給し、精分離室に収納した親油性の繊維シートを通過させて油分を繊維に吸着させ、流入してくる油分と合体して粗大化させて、浮力により繊維シートから押出された油分を精分離室から浮上させ、粗粒化した油分と処理水を分離排出させる油水分離方法で原水中の粗大油分の分離を行い、次に、界面活性剤により安定化した乳化油の乳化状態を破壊して、乳化油の処理が可能となる。
【０００６】
そして、乳化油に添加する処理剤を、カチオン系のポリマーを使用して乳化油を油滴化させるので、処理剤による水酸化アルミなどの固形物の発生が押えられ、ろ材の目詰りが防止できる。重力分離槽から抜出した分離水を、ストレーナーを通過させた後に精分離槽に供給すれば、油水に含まれる混入浮遊物が除去されて、ろ材の目詰りが防止でき、安定した効果を発揮することができる。なお、重力分離槽の粗油分離室に浮上した粗大油滴は、所定レベルに達した時、油分を重力分離槽から排出させるものである。
【０００７】
油水分離方法を実施するための装置は、重力分離槽に網様骨格体を充填した接触分離室を配設し、接触分離室の下方に原水室と、その上方に粗油分離室を設け、並設した精分離槽を重力分離槽に連通させると共に、精分離槽に立設したろ材筒に親油性の繊維シートを充填した精分離室を配設し、ろ材筒の下方に二次原水室と、その上方に微細油分離室を設け、ろ材筒の周部に精分離室に連通する処理水の分離流路を形成したもので重力分離槽の網様骨格体で粗大油滴を分離して、分離水に含まれる処理できなかった微細油滴を、親油性の繊維シートの全体で行なうため、長時間にわたって高い分離効率が維持できる。
【０００８】
そして、重力分離槽の粗油分離室に連結した分離水の分離水管にラインミキサーを介装し、ラインミキサーに薬液ポンプを配設したもので、分離水に含まれる乳化油に処理剤を添加して乳化状態を破壊させ、微小油滴とすることができる。また、分離水管にストレーナーを配設すれば、分離水に混入する浮遊物を捕捉して、精分離槽の繊維シートの目詰まりが防止でき、安定した処理が可能となる。重力分離槽の粗油分離室に油面検知器を設け、この油面検知器に粗油排出弁を連動連結して、油分の蓄積を検知して粗油排出弁を開放させるもので、浮上油が所定レベルに達した時に、粗大油滴を重力分離槽から排出することができる。
【０００９】
精分離室に充填する繊維シートは、親油、撥水性を有する空隙率８０％〜９０％のポリプロピレン製の不織布で、これらを１０ｍｍ×１０ｍｍ程度の適当な大きさに裁断したもので、繊維シートの空隙率が大きく油滴の吸着量が大きいので、繊維シートの内部まで吸着が可能となり、油滴の吸着量が大きくなる。原水の通過抵抗が時間の経過とともに増大することを防ぎ、長時間にわたって高い分離効率を維持できる。精分離室の繊維シートは、複数個の網袋に収納した多数の繊維シートを精分離室に充填すれば、ろ過筒への小さい繊維シートの充填と、目詰まりした繊維シートの取出しが容易となる。
【００１０】
精分離槽の外壁を上槽と下槽で構成し、ろ材筒の下端を下槽の槽底に着脱自在に支持させて、ろ材筒の上端を下槽に内設した支持杆で保持させ、ろ材筒の上端を被覆するパンチングプレートを支持杆に着脱自在に連結したもので、ろ材筒の取り外しが可能となり、上部のパンチングプレートを取外せば、精分離部に充填した繊維シートの交換が容易となる。薬液ポンプの乳化油の処理剤を、カチオン系のポリマーを使用すれば、処理剤による水酸化アルミなどの固形物の発生をおさえ、目詰まりを防止しながら、乳化油を油滴化させることができる。
【００１１】
【発明の実施の形態】
▲１▼第１段階（粗分離部）
油分を含んだ海水または水等の原水は、供給ポンプにより重力分離槽の底部から上向流で圧入され、接触分離室に充填した網様骨格体に接触しながら上昇する。原水中の油分が網様骨格体のろ材表面に接着して油滴化し、連続して圧入される油分によって粗大化し、油滴の浮力が接着力より勝った時に、粗大化した油滴がろ材から離れ、本体分離槽の上部の粗油分離室へと浮上する。粗油分離室の蓄積した浮上油が所定レベルに達した時、油面検知器で検知して粗大油滴を重力分離槽から排出する。
【００１２】
▲２▼第２段階（乳化油破壊部）
重力分離槽で処理出来なかった乳化油と微小油滴を分離水とともに抜出し、少量のカチオン系のポリマーを添加しながらラインミキサーで撹拌し、乳化油を凝集させて微小油滴にする。また、重力分離槽から抜出した分離水に混入する浮遊物をストレーナーで捕捉して、後段の精分離槽の繊維シートの目詰まりを防止する。
【００１３】
▲３▼第３段階（精分離部）
油分の乳化状態を破壊して、混入する浮遊物が取り除かれた油水は、精分離槽に上向流で供給する。精分離室に収納した親油性の繊維シートを通過する油水は、微細油滴を繊維に吸着させ、流入してくる微細油滴と合体して粗大化させる。上向流と浮力により繊維シートから押出された油分は、微細油分離室に浮上する。微細油分離室に蓄積する粗大化した油分は少量であり、運転終了直前あるいは、運転中適宜、手動で弁を開き油分を精分離槽の頂部から排出する。油分を分離した処理水は、ろ材筒の周部の分離流路を流下させて精分離槽から排水する。なお、微細油分離室に油面検知器を設け、微細油分離室の浮上油が所定レベルに達した時に、油分を精分離槽から排出してもよい。
【００１４】
【実施例】
この発明の実施例を図面に基づき詳述すると、まず、図１は油水分離装置の縦断側面図であって、粗大油滴を分離する重力分離槽１と微小油滴を分離する精分離槽２が並設して連通させてある。重力分離槽１の中央部に樹脂製の網様骨格体３を充填した接触分離室４が配設してあり、その槽底１ａに原水室５と槽頂壁１ａに粗油分離室６が設けてある。重力分離槽１の原水室５に原水供給管７が連結してあり、油分を含んだ海水あるいは水等の原水を、ビルジタンクなどから供給ポンプ（図示せず）で原水室５に圧入する。原水室５に圧入された原水は接触分離室４を上昇し、原水中の油分が接触分離室４の網様骨格体３に接触して表面に接着して油滴化し、連続して圧入される油分によって粗大化する。油滴の浮力が接着力より勝った時に、粗大化した油滴が網様骨格体３から離れ、重力分離槽１の上部の粗油分離室６へと浮上して蓄積される。
【００１５】
図２は重力分離槽１の粗油分離室６の拡大図であって、重力分離槽１の粗油分離室６には、網様骨格体３の上方近傍に開口端を斜め上方に開口した分離水の分離水管８と、槽頂壁１ｂ近傍に立ち上らせて開口した粗油排出管９が重力分離槽１の周壁から延設してある。粗油分離室６の分離水の分離水管８と粗油排出管９の間に静電容量式の油面検知器１０が配設してあり、油面検知器１０は粗油排出管９に設けた粗油排出弁１１に連動連結してある。粗油分離室６に蓄積した浮上油が所定レベルに達した時、蓄積した油層を油面検知器１０で検知して粗油排出弁１１を解放し、粗油分離室６の油分を粗油排出管９から抜出す。原水から油分を取除いた分離水は分離水管８から排出する。
【００１６】
図３は油水分離装置の側面図であって、重力分離槽１の粗油分離室６に連結した分離水の分離水管８にラインミキサー１２が介装してあり、ラインミキサー１２に薬液タンク１３に連結した薬液ポンプ１４が接続してある。薬液タンク１３にカチオン系のポリマーが貯留してあり、粗油分離室６から排出した分離水に少量のカチオン系のポリマーを添加してラインミキサー１２で撹拌する。分離水中に分散する乳化油をポリマーで凝集させ、乳化状態を破壊して微小油滴とする。そして、乳化油に添加する処理剤を、カチオン系のポリマーを使用したので、従来の硫酸バンド、ＰＡＣなどの処理剤による水酸化アルミなどの固形物を発生することがない。また、ラインミキサー１２の後段の分離水管８にストレーナー１５が配設してあり、重力分離槽１から抜出した分離水に混入する浮遊物を捕捉させる。このストレーナー１５はラインミキサー１２の前段に設けてもよいものである。
【００１７】
図４は精分離槽の要部拡大図であって、精分離槽２に円筒状のろ材筒１６が立設してあり、ろ材筒１６の内部に複数個の網袋１７…に収納した多数の親油性の繊維シート１８…が充填してある。網袋１７…の繊維シート１８を充填したろ材筒１６の上下をパンチングプレート１９、２０で夾持して精分離室２１を構成してある。繊維シート１８は、親油、撥水性を有する空隙率８０％〜９０％のポリプロピレン製の不織布で、これらを１０ｍｍ×１０ｍｍ程度の適当な大きさに裁断したろ材を使用している。繊維シート１８は空隙率が大きく油滴の吸着量が大きいので、原水の通過抵抗が時間の経過とともに増大することを防ぎ、長時間にわたって高い分離効率を維持できる。多数の繊維シート１８…を網袋１７に充填してパックとすれば、ろ材交換時の小さい繊維シート１８の取出しと、繊維シート１８の充填が簡単に行なえるものである。ろ材筒１６の下端に円筒状の支持板２２が止着してあり、この支持板２２を精分離槽２の槽底２ａに垂設した仕切壁２３に外挿してＯリング３４でシールしてある。ろ材筒１６に囲まれた仕切壁２３の内部を二次原水室２４としてある。
【００１８】
図３に示すように、重力分離槽１で粗大油滴が除かれた分離水の分離水管８が、精分離槽２の槽底２ａに設けた二次原水室２４の流入口２４ａに接続してある。分離水管８に配設したラインミキサー１２とストレーナー１５で浮遊物を取除いて乳化油を微小油滴とした油水を二次原水室２４に流入させる。浮遊物を取除いた油水は、精分離槽２の繊維シート１８の目詰まりを防止することができる。精分離室２１を上向流で上昇する油水中の微細油滴は、親油性の繊維シート１８に吸着させ、後からくる微細油滴と合体して粗大化させる。図１に示すように、精分離槽２にはろ材筒１６の上方に微細油分離室２５が設けてあり、上向流と浮力により繊維シート１８から押出された油分を、微細油分離室２５に浮上させる。微細油分離室２５の上部の槽頂壁２ｂに微細油排出弁２６を設けた微細油排出口２７が連結してある。微細油分離室２５に蓄積する粗大化した油分は少量であり、運転終了直前あるいは、運転中適宜、微細油排出弁２６を手動で開き油分を微細油排出管２７ａから排出する。
【００１９】
図１に示すように、精分離槽２とろ材筒１６の間に処理水の分離流路２８が形成してあり、微細油分離室２５の蓄積する油層の下方から処理水を流下させ、処理水中に含まれる微細油滴を浮力で分離させて、分離流路２８の処理水口２９から処理水管２９ａに排水する。なお、精分離槽２の微細油分離室に油面検知器を設け、微細油分離室の浮上油が所定レベルに達した時に、油分を精分離槽から排出してもよい。図４に示すように、精分離槽２は上槽２ｃと下槽２ｄに二分割可能としてあり、上槽２ｃと下槽２ｄをボルト３０で連結してある。精分離槽２の下槽２ｄの内側に支持板３１が延設してあり、この支持板３１に下端をナット３２で連結した支持杆３３がろ材筒１６の上端を覆うパンチングプレート１９の周端部にナット３２で連結してある。精分離槽２の上槽２ｃを取外し、支持杆３３の上下のボルト３２、３２を取外せば、ろ材筒１６の内部から網袋１７…に収納した多数の親油性の繊維シート１８…を取出すことができる。
【００２０】
（実験例）
油水分離装置について、界面活性剤入り試験液の作成は、ＩＭＯ国際海事機構の小委員会ＤＥ４４において、現行の試験基準がエマルジョン化したビルジに対して考慮が払われていないことで、装置の試験基準改正する事で合意された試験液の作成方法に基いて行なった。先ず、試験液は、真水に食塩を添加して、比重１．１０５（２０℃）に調整した食塩水９５０ｇに、軽油２５ｇとＣ重油２５ｇの割合で添加した後、２００ｒｐｍの撹拌機で充分に撹拌混合して試験液１を作成した。また、この試薬に界面活性剤（ドデシルベンゼンスルホン酸ソーダ）０．５ｇと黒色酸化鉄０．１ｇの割合で添加した後、２００ｒｐｍの撹拌機で充分に撹拌混合して界面活性剤入り試験液２を作成した。
【００２１】
【表１】

【００２２】
試験方法は、先ず、上記の食塩水に軽油とＣ重油を添加した試験液１を、１７５０ｒｐｍの渦巻ポンプで本願発明の油水分離装置に供給して試験した。２時間３０分後に、上記の軽油とＣ重油を添加した食塩水に、界面活性剤、黒色酸化鉄を混入し試験液に切り替え、油水分離装置の重力分離槽と精分離槽の間にラインミキサーとストレーナーを配設して、少量の有機系のカチオンポリマーを添加撹拌して試験を行なった。実験結果は表１のとおりである。試験結果は、薬剤の界面活性剤、黒色酸化鉄混入を添加しない場合、２時間を経過した頃より処理水中の油分濃度が上昇し、薬剤を添加することにより、処理水の油分濃度が低下して安定した処理が可能となった。薬剤添加の効果は非常に優れており、ろ材の目詰まりなどの発生もなかった。
【００２３】
【発明の効果】
この発明は上記のように構成してあり、網様骨格体を充填した重力分離槽と親油性の繊維シートを充填した精分離槽を並設して、原水中の油分を分離するので、高い分離効率が得られるものである。そして、粗大油滴を分離した分離水に含まれる乳化油を微小油滴とするので、界面活性剤により安定化している乳化油の乳化状態を破壊して、油水分離が可能となる。即ち、粗粒化法の従来装置にあっては、微少油滴を分離する後段の粗粒化繊維分離層は、微細なろ材が使用されており、目詰りが発生して頻繁にろ材洗浄と、交換作業が必要であった。そして、乳化油を凝集させる金属塩の凝集剤は、水酸化アルミなどの固形物が発生し、船舶用の油水分離装置としては採用ができなかったものであるが、この発明の油水分離方法は、油分を含んだ原水を重力分離槽に充填した網様骨格体に油分を接着させて油滴化し、網様骨格体で処理出来なかった乳化油に処理剤を添加して、乳化状態を解消させた油水を精分離槽に供給し、親油性の繊維シートを通過させて油分を繊維に吸着させ、粗粒化した油分と処理水を分離排出させるので、原水中の粗大油分の分離を行い、次に、界面活性剤により安定化した乳化油の乳化状態を破壊して、微小油滴の処理が可能となる。
【００２４】
乳化油の処理剤は、カチオン系のポリマーを使用して乳化油を油滴化させる方法であり、処理剤による水酸化アルミなどの固形物の発生をおさえ、ろ材の目詰りが防止できる。そして、重力分離槽から抜出した分離水を、ストレーナーを通過させた後に精分離槽に供給すれば、油水に含まれる混入浮遊物が除去されて、ろ材の目詰りが防止でき、安定した効果を発揮することができる。なお、重力分離槽の粗油分離室に浮上した粗大油滴は、所定レベルに達した時、油分を重力分離槽から排出するものである。
【００２５】
油水分離方法を実施するための装置は、重力分離槽に網様骨格体を充填した接触分離室を配設し、接触分離室の下方に原水室と、その上方に粗油分離室を設け、並設した精分離槽を重力分離槽に連通させると共に、精分離槽に立設したろ材筒に親油性の繊維シートを充填した精分離室を配設し、ろ材筒の下方に二次原水室と、その上方に微細油分離室を設け、ろ材筒の周部に精分離室に連通する処理水の分離流路を形成したので、重力分離槽の網様骨格体で粗大油滴を分離して、分離水に含まれる処理できなかった微細油滴を、親油性の繊維シートの全体で行なうため、長時間にわたって高い分離効率が維持できる。
【００２６】
重力分離槽の分離水管に薬液ポンプを配設したラインミキサーを介装したので、分離水に含まれる乳化油の乳化状態を破壊させ、微小油滴とすることができる。また、分離水管にストレーナーを配設すれば、分離水に混入する浮遊物を捕捉して、精分離槽の繊維シートの目詰まりが防止でき、安定した処理が可能となる。そして、重力分離槽の粗油分離室に設けた油面検知器と粗油排出弁を連動連結したので、浮上油が所定レベルに達した時に、蓄積した粗大油滴を重力分離槽から排出することができる。
【００２７】
精分離室に充填する繊維シートは、親油、撥水性を有する空隙率８０％〜９０％で、１０ｍｍ×１０ｍｍ程度のポリプロピレン製の不織布としたので、繊維シートの内部まで吸着が可能となり、油滴の吸着量が大きくなる。多数の繊維シートを収納した網袋を精分離室に充填すれば、小さい繊維シートのろ過筒への充填と、目詰まりした繊維シートの取出しが容易となる。そして、精分離槽の外壁を上槽と下槽で構成し、ろ材筒の下端を下槽の槽底に着脱自在に支持させて、ろ材筒の上端を下槽に内設した支持杆で保持させ、ろ材筒の上端を被覆するパンチングプレートを支持杆に着脱自在に連結したので、ろ材筒の取り外しが可能となり、上部のパンチングプレートを取外せば、繊維シートの交換が容易となる。また、薬液ポンプの乳化油の処理剤を、カチオン系のポリマーを使用すれば、水酸化アルミなどの固形物の発生をおさえ、目詰まりを防止しながら、乳化油を油滴化させることができる。
【図面の簡単な説明】
【図１】この発明に係る油水分離装置の要部縦断側面図である。
【図２】同じく、油水分離装置の接触分離槽の要部縦断側面図である。
【図３】同じく、油水分離装置の側面図である。
【図４】同じく、油水分離装置の精離槽の要部縦断側面図である。
【符号の説明】
１重力分離槽
２精分離槽
２ａ槽底
２ｃ上槽
２ｄ下槽
３網様骨格体
４接触分離室
５原水室
６粗油分離室
８分離水管
１０油面検知器
１１粗油排出弁
１２ラインミキサー
１４薬液ポンプ
１５ストレーナー
１６ろ材筒
１７網袋
１８繊維シート
１９パンチングプレート
２１精分離室
２４二次原水室
２５微細油分離室
２８分離流路
３３支持杆[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an oil-water separation method for separating seawater or oil contained in water by bilge, ballast, tank cleaning, or the like generated from a ship or the like, and a separation device therefor.
[0002]
[Prior art]
Generally, as an oil-water separation method, (1) a gravity separation method using a specific gravity difference between oil and water. (2) Coalescer method in which oil is coarsened by passing through a thin tube. (3) An adsorption method in which oil is adsorbed on activated carbon, a polymer material, or the like. {Circle around (4)} In addition, there are a bubble floating method, a biological treatment method, and coagulation separation by adding a chemical. As the oil-water separation device for ships, due to problems such as swaying of the ship and installation space, a system that appropriately combines a gravity separation unit provided with multilayer parallel plates, a coarse-grained fiber layer, an adsorption collection unit, and the like is adopted. However, the coarsening method is mainly used. For example, as described in Japanese Utility Model Publication No. Hei 6-21521, an oil coarse-grained layer composed of metal or synthetic resin fibers and an oil coarse-grained part composed of a water-repellent and oil-repellent porous membrane. An oil-water separator of a coarse-graining method for separating bilges and the like in a ship into water and oil is known.
[0003]
[Problems to be solved by the invention]
In these separation methods, the coarse-grained fiber separation layer or the adsorptive collection unit, which is the means for separating the fine oil droplets after the coarse separation, uses a very fine-grained material, which causes clogging. As a result, the passage resistance when the raw water containing oil passes increases. Then, the flow velocity of the coarse-grained fiber separation layer or the adsorbing and collecting section is increased, and the fine oil droplets cannot be sufficiently coarsened and flow out together with the treated water. Atsuta. At present, the coarse-graining method cannot treat finely emulsified oily water with a surfactant of 10 μm or less. In this case, it is necessary to frequently carry out replacement work, for example, regeneration by washing or, in some cases, replacement work.
[0004]
As a means for separating the emulsified oil stabilized by a surfactant or the like, there are a method of coarsening with an agent such as a sulfate band and PAC, and a method of dissolving aluminum as an electrode and coagulating with aluminum ions eluted. These flocculants could not be used as oil-water separators for ships due to the generation of solids such as aluminum hydroxide, handling of chemicals, and swaying of ships. The present invention provides a coarse separation method and a separation apparatus in which a gravity separation tank filled with a net-like skeleton and a fine separation tank filled with a lipophilic fiber sheet are juxtaposed to separate oil in raw water. provide. In addition, a treatment agent is added to the separation water in the gravity separation tank from which the oil has been separated, and the emulsified state of the emulsified oil contained in the separation water is destroyed, so that a separation method and a separation apparatus of a coarse-graining method capable of performing a stable treatment. I will provide a.
[0005]
[Means for Solving the Problems]
In the oil-water separation method according to the gist of the present invention, raw water containing oil is supplied in an upward flow to a gravity separation tank, and the oil is bonded to a mesh-like skeleton filled in a contact separation chamber of the gravity separation tank to form oil droplets. , The oil droplets are coarsened by the continuously supplied raw water, the oil droplets having buoyancy superior to the adhesive force are lifted from the contact separation chamber, and the emulsified oil contained in the separated water that could not be treated in the contact separation chamber Is extracted from the gravity separation tank and stirred with a line mixer while adding a treating agent for the emulsified oil to eliminate the emulsified state of the oil.Then, this oil water is supplied to the fine separation tank in an upward flow, and the fine separation is performed. The oil is adsorbed on the fiber by passing through the lipophilic fiber sheet stored in the chamber, and is combined with the inflowing oil to make it coarse, and the oil that is extruded from the fiber sheet by buoyancy is lifted from the fine separation chamber. Oil water that separates and discharges coarse oil and treated water Away also separate raw water coarse oil in the process, then destroy the emulsified state of stabilized emulsified oil by a surfactant, it is possible to process the emulsified oil.
[0006]
The treatment agent added to the emulsified oil uses a cationic polymer to convert the emulsified oil into oil droplets, which suppresses the generation of solids such as aluminum hydroxide by the treatment agent and prevents clogging of the filter media. it can. If the separation water extracted from the gravity separation tank is supplied to the fine separation tank after passing through the strainer, the suspended matter contained in the oil water is removed, and the clogging of the filter medium can be prevented, and a stable effect is exhibited. be able to. When the coarse oil droplets floating in the crude oil separation chamber of the gravity separation tank reach a predetermined level, oil is discharged from the gravity separation tank.
[0007]
The apparatus for performing the oil-water separation method is provided with a contact separation chamber filled with a net-like skeleton in a gravity separation tank, a raw water chamber below the contact separation chamber, and a crude oil separation chamber above the raw water chamber. In addition to connecting the juxtaposed fine separation tank to the gravity separation tank, a fine separation chamber filled with a lipophilic fiber sheet is arranged in a filter medium cylinder standing in the fine separation tank, and a secondary raw water chamber below the filter medium cylinder A fine oil separation chamber is provided above it, and a separation channel for treated water communicating with the fine separation chamber is formed around the periphery of the filter media cylinder, and coarse oil droplets are separated by the net-like skeleton of the gravity separation tank. As a result, fine oil droplets contained in the separated water, which cannot be treated, are removed from the entire lipophilic fiber sheet, so that high separation efficiency can be maintained for a long time.
[0008]
Then, a line mixer is interposed in the separation water pipe of the separated water connected to the crude oil separation chamber of the gravity separation tank, and a chemical liquid pump is installed in the line mixer, and the treating agent is added to the emulsified oil contained in the separated water. Thus, the emulsified state is destroyed, and fine oil droplets can be formed. In addition, if a strainer is provided in the separation water pipe, suspended matter mixed in the separation water can be captured, clogging of the fiber sheet in the fine separation tank can be prevented, and stable processing can be performed. An oil level detector is installed in the crude oil separation chamber of the gravity separation tank, and a crude oil discharge valve is linked to this oil level detector to detect accumulation of oil and open the crude oil discharge valve. When the oil reaches a predetermined level, coarse oil droplets can be discharged from the gravity separation tank.
[0009]
The fiber sheet to be filled in the fine separation chamber is a nonwoven fabric made of polypropylene having lipophilicity and water repellency and having a porosity of 80% to 90%, which is cut into an appropriate size of about 10 mm × 10 mm. Since the porosity is large and the amount of oil droplets adsorbed is large, it is possible to adsorb the inside of the fiber sheet, and the amount of oil droplets adsorbed increases. It is possible to prevent the passage resistance of the raw water from increasing with time, and to maintain a high separation efficiency for a long time. Filling the fine separation chamber with a large number of fiber sheets stored in multiple mesh bags makes it easy to fill small fiber sheets into the filter cylinder and take out clogged fiber sheets. Become.
[0010]
The outer wall of the fine separation tank is composed of an upper tank and a lower tank, the lower end of the filter medium cylinder is detachably supported on the bottom of the lower tank, and the upper end of the filter medium cylinder is held by a support rod provided in the lower tank, A punching plate that covers the upper end of the filter media tube is detachably connected to the support rod. The filter media tube can be removed, and the fiber sheet filled in the fine separation section can be easily replaced by removing the upper punching plate. It becomes. If a cationic polymer is used as a treatment agent for the emulsified oil of the chemical liquid pump, the generation of solids such as aluminum hydroxide by the treatment agent can be suppressed, and the emulsified oil can be converted to oil droplets while preventing clogging. it can.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
(1) First stage (coarse separation section)
Raw water such as seawater or water containing oil is injected upward from the bottom of the gravity separation tank by a supply pump, and rises while contacting the mesh-like skeleton filled in the contact separation chamber. When the oil in the raw water adheres to the filter medium surface of the mesh-like skeleton to form oil droplets, it is coarsened by the continuously injected oil, and when the buoyancy of the oil droplets exceeds the adhesive strength, the coarse oil droplets become And rises to the crude oil separation chamber above the main body separation tank. When the accumulated floating oil in the crude oil separation chamber reaches a predetermined level, it is detected by an oil level detector and large oil droplets are discharged from the gravity separation tank.
[0012]
(2) Second stage (Emulsified oil destruction part)
The emulsified oil and the fine oil droplets that could not be treated in the gravity separation tank are extracted together with the separated water, and stirred with a line mixer while adding a small amount of a cationic polymer to coagulate the emulsified oil into fine oil droplets. In addition, the suspended matter mixed in the separated water extracted from the gravity separation tank is captured by a strainer to prevent the fiber sheet in the subsequent fine separation tank from being clogged.
[0013]
(3) Third stage (fine separation section)
The oil water from which the emulsified state of the oil is destroyed and the suspended matter mixed therein is removed is supplied to the fine separation tank in an upward flow. The oil water passing through the lipophilic fiber sheet stored in the fine separation chamber causes the fine oil droplets to be adsorbed on the fibers, and coalesces with the flowing fine oil droplets to become coarse. The oil extruded from the fiber sheet by the upward flow and the buoyancy floats in the fine oil separation chamber. The amount of coarse oil accumulated in the fine oil separation chamber is small, and the valve is manually opened immediately before the end of the operation or during the operation to discharge the oil from the top of the fine separation tank. The treated water from which the oil has been separated flows down the separation channel around the filter medium cylinder and is drained from the fine separation tank. An oil level detector may be provided in the fine oil separation chamber, and when the floating oil in the fine oil separation chamber reaches a predetermined level, the oil may be discharged from the fine separation tank.
[0014]
【Example】
FIG. 1 is a vertical sectional side view of an oil-water separation device, in which a gravity separation tank 1 for separating coarse oil droplets and a fine separation tank 2 for separating fine oil droplets. Are connected side by side. A contact separation chamber 4 filled with a resin net-like skeleton 3 is provided at the center of the gravity separation tank 1, and a raw water chamber 5 is provided at a tank bottom 1 a and a crude oil separation chamber 6 is provided at a tank top wall 1 a. It is provided. A raw water supply pipe 7 is connected to the raw water chamber 5 of the gravity separation tank 1, and raw water such as seawater or water containing oil is pressed into the raw water chamber 5 from a bilge tank or the like by a supply pump (not shown). The raw water that has been injected into the raw water chamber 5 rises in the contact separation chamber 4, and the oil in the raw water contacts the mesh-like skeleton 3 of the contact separation chamber 4 and adheres to the surface to form oil droplets, and is continuously injected. Oils. When the buoyancy of the oil droplet exceeds the adhesive force, the coarse oil droplet separates from the net-like skeleton 3 and floats and accumulates in the coarse oil separation chamber 6 above the gravity separation tank 1.
[0015]
FIG. 2 is an enlarged view of the crude oil separation chamber 6 of the gravity separation tank 1. In the crude oil separation chamber 6 of the gravity separation tank 1, an opening end is opened diagonally upward near the upper part of the mesh-like skeleton 3. A separation water pipe 8 of separated water and a crude oil discharge pipe 9 which is raised and opened near the tank top wall 1b extend from the peripheral wall of the gravity separation tank 1. A capacitive oil level detector 10 is disposed between the separated water pipe 8 and the crude oil discharge pipe 9 of the separated water in the crude oil separation chamber 6, and the oil level detector 10 is connected to the crude oil discharge pipe 9. It is linked to the provided crude oil discharge valve 11. When the floating oil accumulated in the crude oil separation chamber 6 reaches a predetermined level, the accumulated oil layer is detected by the oil level detector 10, the crude oil discharge valve 11 is opened, and the oil content in the crude oil separation chamber 6 is reduced. Pull out from the discharge pipe 9. Separated water from which oil has been removed from the raw water is discharged from the separated water pipe 8.
[0016]
FIG. 3 is a side view of the oil / water separator, in which a line mixer 12 is interposed in a separation water pipe 8 of the separated water connected to the crude oil separation chamber 6 of the gravity separation tank 1, and a chemical solution tank 13 is provided in the line mixer 12. Is connected to a chemical pump 14. A cationic polymer is stored in the chemical tank 13, and a small amount of the cationic polymer is added to the separated water discharged from the crude oil separation chamber 6 and stirred by the line mixer 12. The emulsified oil dispersed in the separated water is agglomerated with a polymer, and the emulsified state is broken to form micro oil droplets. Since the treatment agent to be added to the emulsified oil uses a cationic polymer, a solid such as aluminum hydroxide is not generated by a treatment agent such as a conventional sulfate band or PAC. In addition, a strainer 15 is provided in the separation water pipe 8 at the subsequent stage of the line mixer 12 to trap suspended matter mixed in the separated water extracted from the gravity separation tank 1. The strainer 15 may be provided in a stage preceding the line mixer 12.
[0017]
FIG. 4 is an enlarged view of a main part of the fine separation tank, in which a cylindrical filter medium tube 16 is erected in the fine separation tank 2 and a plurality of filter media tubes 16 are accommodated in a plurality of mesh bags 17. . Are filled. A fine separation chamber 21 is formed by sandwiching the upper and lower sides of the filter medium tube 16 filled with the fiber sheets 18 of the mesh bags 17 with punching plates 19 and 20. The fibrous sheet 18 is a polypropylene nonwoven fabric having a lipophilicity and a water repellency and a porosity of 80% to 90%, and a filter medium obtained by cutting these into an appropriate size of about 10 mm × 10 mm is used. Since the fiber sheet 18 has a high porosity and a large amount of oil droplets adsorbed thereon, the passage resistance of raw water is prevented from increasing with time, and a high separation efficiency can be maintained for a long time. If a large number of fiber sheets 18 are filled into the mesh bag 17 to form a pack, it is possible to easily take out the small fiber sheet 18 and replace the fiber sheet 18 when replacing the filter medium. A cylindrical support plate 22 is fixed to the lower end of the filter medium tube 16, and the support plate 22 is externally inserted into a partition wall 23 that is vertically provided at the bottom 2 a of the fine separation tank 2, and sealed with an O-ring 34. is there. The inside of the partition wall 23 surrounded by the filter medium tube 16 is defined as a secondary raw water chamber 24.
[0018]
As shown in FIG. 3, a separation water pipe 8 of separated water from which coarse oil droplets have been removed in the gravity separation tank 1 is connected to an inlet 24 a of a secondary raw water chamber 24 provided at the tank bottom 2 a of the fine separation tank 2. It is. The suspended matter is removed by the line mixer 12 and the strainer 15 arranged in the separation water pipe 8, and the oil water in which the emulsified oil is converted into minute oil droplets flows into the secondary raw water chamber 24. The oily water from which the suspended matter has been removed can prevent the fiber sheet 18 of the fine separation tank 2 from being clogged. The fine oil droplets in the oil water rising in the fine separation chamber 21 in the upward flow are adsorbed on the lipophilic fiber sheet 18 and are combined with the fine oil droplets coming later and coarsened. As shown in FIG. 1, a fine oil separation chamber 25 is provided in the fine separation tank 2 above the filter medium cylinder 16, and the oil component extruded from the fiber sheet 18 by the upward flow and the buoyancy is separated from the fine oil separation chamber 25. Surface. A fine oil discharge port 27 provided with a fine oil discharge valve 26 is connected to the tank top wall 2b above the fine oil separation chamber 25. The coarse oil accumulated in the fine oil separation chamber 25 is small, and the fine oil discharge valve 26 is manually opened immediately before the end of the operation or during the operation to discharge the oil from the fine oil discharge pipe 27a.
[0019]
As shown in FIG. 1, a separation channel 28 for treated water is formed between the fine separation tank 2 and the filter medium cylinder 16, and the treated water is allowed to flow down from below the oil layer that accumulates in the fine oil separation chamber 25. The fine oil droplets contained in the water are separated by buoyancy and drained from the treated water port 29 of the separation channel 28 to the treated water pipe 29a. Note that an oil level detector may be provided in the fine oil separation chamber of the fine oil separation tank 2, and when the floating oil in the fine oil separation chamber reaches a predetermined level, the oil may be discharged from the fine oil separation tank. As shown in FIG. 4, the fine separation tank 2 can be divided into an upper tank 2c and a lower tank 2d, and the upper tank 2c and the lower tank 2d are connected by bolts 30. A support plate 31 extends inside the lower tank 2 d of the fine separation tank 2, and a support rod 33 having a lower end connected to the support plate 31 by a nut 32 covers the upper end of the filter medium tube 16. The parts are connected to each other by a nut 32. By removing the upper tank 2c of the fine separation tank 2 and removing the upper and

lower bolts

32, 32 of the support rod 33, a large number of lipophilic fiber sheets 18 stored in the mesh bag 17 are removed from the inside of the filter medium tube 16. be able to.
[0020]
(Experimental example)
For the oil-water separation device, the preparation of a test solution containing a surfactant was tested by the IMO International Maritime Organization Sub-Committee DE44 because the current test standards did not take into account emulsified bilge. It was carried out based on the test liquid preparation method agreed to the revision of the standard. First, the test solution is prepared by adding salt to fresh water and adding 950 g of saline adjusted to a specific gravity of 1.105 (20 ° C.) at a ratio of 25 g of light oil and 25 g of heavy C oil, and then sufficiently using a stirrer at 200 rpm. Test liquid 1 was prepared by stirring and mixing. Further, after adding 0.5 g of a surfactant (sodium dodecylbenzenesulfonate) and 0.1 g of black iron oxide to this reagent, the mixture was thoroughly stirred and mixed with a stirrer at 200 rpm to obtain a test solution 2 containing a surfactant. It was created.
[0021]
[Table 1]

[0022]
The test method was as follows. First, test liquid 1 obtained by adding light oil and heavy fuel oil C to the above-mentioned saline solution was supplied to the oil-water separator of the present invention by a centrifugal pump at 1750 rpm and tested. After 2 hours and 30 minutes, the surfactant and black iron oxide were mixed into the above saline solution to which light oil and heavy oil C had been added, and the solution was switched to the test solution. A line mixer was placed between the gravity separation tank and the fine separation tank of the oil-water separator. And a strainer, and a small amount of an organic cationic polymer was added and stirred to conduct a test. Table 1 shows the experimental results. The test results show that when no surfactant and black iron oxide are added, the oil concentration in the treated water increases after about 2 hours, and the oil concentration decreases in the treated water by adding the agent. And stable processing became possible. The effect of the addition of the drug was extremely excellent, and no clogging of the filter medium occurred.
[0023]
【The invention's effect】
The present invention is configured as described above, and a gravity separation tank filled with a net-like skeleton and a fine separation tank filled with a lipophilic fiber sheet are juxtaposed to separate oil in raw water. Separation efficiency can be obtained. Then, since the emulsified oil contained in the separated water from which the coarse oil droplets have been separated is made into fine oil droplets, the emulsified state of the emulsified oil stabilized by the surfactant is destroyed, and oil-water separation becomes possible. That is, in the conventional apparatus of the coarse-graining method, a fine-grained filter medium is used for the coarse-grained fiber separation layer at the subsequent stage for separating micro oil droplets, and clogging occurs and the filter medium is frequently washed and cleaned. , Replacement work was required. The coagulant of the metal salt that coagulates the emulsified oil generates solids such as aluminum hydroxide, and cannot be used as an oil-water separator for ships. The oil is adhered to the reticulated skeleton filled with the raw water containing the oil in the gravity separation tank to form oil droplets, and the processing agent is added to the emulsified oil that could not be processed by the reticulated skeleton to eliminate the emulsified state The oily water is supplied to the fine separation tank, and passed through a lipophilic fiber sheet to adsorb the oily content to the fibers.The coarse oil and the treated water are separated and discharged, so the coarse oil content in the raw water is separated. Next, the emulsified state of the emulsified oil stabilized by the surfactant is destroyed, and the treatment of the fine oil droplets becomes possible.
[0024]
The treatment agent for emulsified oil is a method in which a cationic polymer is used to convert the emulsified oil into oil droplets, which suppresses generation of solids such as aluminum hydroxide by the treatment agent and can prevent clogging of the filter medium. Then, if the separated water extracted from the gravity separation tank is supplied to the fine separation tank after passing through the strainer, the mixed suspended matter contained in the oil water is removed, and clogging of the filter medium can be prevented, and a stable effect is obtained. Can be demonstrated. When the coarse oil droplets floating in the crude oil separation chamber of the gravity separation tank reach a predetermined level, oil is discharged from the gravity separation tank.
[0025]
The apparatus for performing the oil-water separation method is provided with a contact separation chamber filled with a net-like skeleton in a gravity separation tank, a raw water chamber below the contact separation chamber, and a crude oil separation chamber above the raw water chamber. In addition to connecting the juxtaposed fine separation tank to the gravity separation tank, a fine separation chamber filled with a lipophilic fiber sheet is arranged in a filter medium cylinder standing in the fine separation tank, and a secondary raw water chamber below the filter medium cylinder And a fine oil separation chamber above it, and a separation channel for treated water communicating with the fine separation chamber was formed around the filter media cylinder, so that coarse oil droplets were separated by the net-like skeleton of the gravity separation tank. As a result, fine oil droplets contained in the separated water, which cannot be treated, are removed from the entire lipophilic fiber sheet, so that high separation efficiency can be maintained for a long time.
[0026]
Since the line mixer in which the chemical liquid pump is disposed is provided in the separation water pipe of the gravity separation tank, the emulsified state of the emulsified oil contained in the separated water can be destroyed to form fine oil droplets. In addition, if a strainer is provided in the separation water pipe, suspended matter mixed in the separation water can be captured, clogging of the fiber sheet in the fine separation tank can be prevented, and stable processing can be performed. And, since the oil level detector and the crude oil discharge valve provided in the crude oil separation chamber of the gravity separation tank are linked and connected, when the floating oil reaches a predetermined level, the accumulated large oil droplets are discharged from the gravity separation tank. be able to.
[0027]
The fiber sheet to be filled in the fine separation chamber is made of a polypropylene nonwoven fabric having a lipophilicity and a water repellent porosity of 80% to 90% and a size of about 10 mm × 10 mm. The amount of adsorbed droplets increases. By filling a mesh bag containing a large number of fiber sheets into the fine separation chamber, it is easy to fill a filter tube with a small fiber sheet and to take out a clogged fiber sheet. The outer wall of the fine separation tank is composed of an upper tank and a lower tank. The lower end of the filter medium cylinder is detachably supported on the bottom of the lower tank, and the upper end of the filter medium cylinder is held by a support rod provided in the lower tank. Since the punching plate covering the upper end of the filter medium tube is detachably connected to the support rod, the filter medium tube can be removed, and the fiber sheet can be easily replaced by removing the upper punching plate. Also, if a cationic polymer is used as a treatment agent for the emulsified oil of the chemical liquid pump, it is possible to suppress the generation of solids such as aluminum hydroxide and to make the emulsified oil oil droplets while preventing clogging. .
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional side view of a main part of an oil-water separation device according to the present invention.
FIG. 2 is a vertical sectional side view of a main part of a contact separation tank of the oil-water separation device.
FIG. 3 is a side view of the oil-water separation device.
FIG. 4 is a vertical sectional side view of a main part of the separation tank of the oil-water separation device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Gravity separation tank 2 Fine separation tank 2a Tank bottom 2c Upper tank 2d Lower tank 3 Reticulated skeleton 4 Contact separation chamber 5 Raw water chamber 6 Crude oil separation chamber 8 Separation water pipe 10 Oil level detector 11 Crude oil discharge valve 12 Line mixer 14 Chemical solution pump 15 Strainer 16 Filter media cylinder 17 Mesh bag 18 Fiber sheet 19 Punching plate 21 Fine separation chamber 24 Secondary raw water chamber 25 Fine oil separation chamber 28 Separation channel 33 Support rod

Claims

Raw water containing oil is supplied to the gravity separation tank (1) in an upward flow, and the oil is adhered to the mesh-like skeleton (3) filled in the contact separation chamber (4) of the gravity separation tank (1), thereby obtaining oil. Oil droplets are made coarse by the continuous supply of raw water, so that oil droplets having buoyancy greater than the adhesive force float from the contact separation chamber (4) and cannot be treated in the contact separation chamber (4). The emulsified oil contained in the separated water is withdrawn from the gravity separation tank (1) and stirred with a line mixer (12) while adding a treating agent for the emulsified oil to eliminate the emulsified state of the oil. Is supplied to the fine separation tank (2) in an upward flow, passes through a lipophilic fiber sheet (18) housed in the fine separation chamber (21), adsorbs oil to the fibers, and combines with the incoming oil. And the oil component extruded from the fiber sheet (18) by buoyancy is separated into a fine separation chamber (21). Is al floating, oil-water separation method characterized by the coarse-grained oil component the treated water is separated discharge.

The oil-water separation method according to claim 1, wherein a cationic polymer is used as the treating agent added to the emulsified oil.

The separation water extracted from the gravity separation tank (1) is fed to a fine separation tank (2) after passing through a strainer (15) to remove mixed suspended matter. An oil-water separation method as described above.

When the coarse oil droplets floating in the crude oil separation chamber (6) of the gravity separation tank (1) reach a predetermined level, the stacked large oil droplets are discharged from the crude oil separation chamber (6). The oil-water separation method according to claim 1.

A contact separation chamber (4) filled with a reticulated skeleton (3) is disposed in a gravity separation tank (1), and a raw water chamber (5) is provided below the contact separation chamber (4), and crude oil is separated above the raw water chamber (5). A chamber (6) is provided to connect the juxtaposed fine separation tank (2) to the gravity separation tank (1), and a lipophilic fiber sheet (16) is provided to a filter medium tube (16) installed in the fine separation tank (2). A fine separation chamber (21) filled with 18) is provided, a secondary raw water chamber (24) is provided below the filter medium cylinder (16), and a fine oil separation chamber (25) is provided above the secondary water chamber (24). An oil-water separation device, wherein a separation channel (28) for treated water communicating with the fine separation chamber (21) is formed in the periphery of (2).

A line mixer (12) is interposed in the separation water pipe (8) connected to the crude oil separation chamber (6) of the gravity separation tank (1), and a chemical pump (14) is provided in the line mixer (12). The oil-water separation device according to claim 5, wherein:

The oil-water separation device according to claim 6, wherein a strainer (15) is provided in the separation water pipe (8) to trap the suspended matter.

An oil level detector (10) is provided in the crude oil separation chamber (6) of the gravity separation tank (1), and a crude oil discharge valve (11) is operatively connected to the oil level detector (10). The oil-water separator according to any one of claims 5 to 7.

The fiber sheet (18) to be filled in the fine separation chamber (21) is a nonwoven fabric made of polypropylene having lipophilicity and water repellency and having a porosity of 80% to 90%. The oil-water separation device according to any one of claims 5 to 8, comprising a cut filter medium.

The fiber sheets (18 ...) to be filled in the fine separation chamber (21) are housed in a plurality of mesh bags (17 ...), according to any one of claims 5 to 9, characterized in that: Oil-water separator.

The outer wall of the fine separation tank (2) is composed of an upper tank (2c) and a lower tank (2d), and the lower end of the filter medium tube (16) is detachably supported on the tank bottom (2a) of the lower tank (2d). Then, the upper end of the filter medium tube (16) is held by the support rod (33) provided in the lower tank (2d), and the punching plate (19) covering the upper end of the filter medium tube (16) is attached to the support rod (33). The oil-water separator according to any one of claims 5 to 10, wherein the oil-water separator is detachably connected.

The oil-water separator according to any one of claims 5 to 11, wherein a cationic polymer is used as a treatment agent for the emulsified oil of the chemical liquid pump (14).