JP2004298750A - Purification apparatus and purification method for purifying contaminated soil - Google Patents

Purification apparatus and purification method for purifying contaminated soil Download PDF

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JP2004298750A
JP2004298750A JP2003094664A JP2003094664A JP2004298750A JP 2004298750 A JP2004298750 A JP 2004298750A JP 2003094664 A JP2003094664 A JP 2003094664A JP 2003094664 A JP2003094664 A JP 2003094664A JP 2004298750 A JP2004298750 A JP 2004298750A
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water
filtration
purification
cleanliness
squeezed
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JP3766933B2 (en
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Takashi Isano
隆 伊佐野
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Toyo Constr Co Ltd
東洋建設株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a purification apparatus and a purification method which downsize each component unit and efficiently treat hydrophobic material-containing contaminated soil or waste water. <P>SOLUTION: The purification apparatus has a dehydrator 3 that particularly compresses and dehydrates sediment sludge 15, 15a precipitated in a coagulation sedimentation tank 2, a highly purified water recovery chute 61 that recovers highly purified water 16' squeezed out from a squeeze filter press in the dehydrator 3, a belt conveyor 62 that recovers low purified water squeezed out in the same way and clods, and a filtration-adsorption means 5 comprising a filtration adsorbent 23b. The highly purified water 16' squeezed from the squeeze filter press is recovered by the recovery chute 61 and purified with the filtration adsorbent 23b. As the filtration adsorbent 23b is composed of only one spongy urethane resin, the processing time can be considerably reduced, and all units composing the purification apparatus can be miniaturized. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、海底、又は河底等の底質に含有する疎水性物質を除去する浄化装置及び浄化方法に関するものである。
【0002】
【従来の技術】
工事排水には、様々な疎水性有害物質が含まれているが、この疎水性物質を含んだ排水は、流れが緩やかな場所では固体分が沈降し底質となり、疎水性物質は水に難溶であるために、高濃度の疎水性物質が蓄積した底質が形成されることとなる。特に、底質中の小粒子径固体と有機物は、単位体積当りの表面積が非常に大きいために、ダイオキシン類を含む多量の疎水性物質を含有している。
【0003】
そこで、このように汚染された海底、又は河底の底質を浄化する従来の浄化装置を、図5に基いて説明する。
従来の浄化装置は、海底、又は河底の疎水性物質例えばダイオキシン類を含有する底質から浚渫船により掘削した汚染土壌を、基準径以下の粒子に分級する分級手段1と、この分級手段1で分級された極小粒子をフロック化し凝集沈殿させ、沈殿泥15、15aと高清浄度水16とを分離させる凝集沈殿槽2と、この凝集沈殿槽2に沈殿した沈殿泥15、15aを圧搾脱水する脱水装置3と、凝集沈殿槽2により分離された高清浄度水16を濾過吸着処理する濾過吸着手段50とから概略構成されている。
【0004】
分級手段1は、振動篩6及びサイクロン7で構成されており、浚渫船により海底、又は河底等の底質を浚渫し、この底質をパイプ輸送し、まず、振動篩6により、大径粒子(粒径≧2mm)と、高濃度のダイオキシン類等を含む水分が付着する中径粒子(粒径<2mm)とに分級して、中径粒子は泥水受槽8、大径粒子は粗粒土回収槽9に貯留される。この時、振動篩6には、洗浄水槽6aから洗浄水ポンプ30により洗浄水が圧送され、泥粒子等を洗浄する。この洗浄水槽6aには、後述する濾過吸着手段50の吸着処理水受槽54に貯留された吸着処理水の一部が洗浄水として送水ポンプ37aにより送水されている。
【0005】
次に、泥水受槽8に貯留された中径粒子はさらにサイクロン7により分級され、分級された極小径粒子(粒径<74μm)は、泥水受槽10に貯留され、小径粒子(74μm≦粒径<2mm)は、粗粒土回収槽9に貯留される。また、泥水受槽10には、後述する濾過吸着手段50の砂濾過水槽51、及び活性炭槽53を、送水ポンプ52a、54aにより送水した各処理水で洗浄した際に発生する洗浄汚水が圧送され、極小径粒子と共に均一に攪拌されて、その泥水が移送ポンプ31により凝集沈殿槽2に圧送される。ここで、それぞれの粒径により分級する際、基準となる径は、事前に粒径とダイオキシン類含有量との関係を調査し適宜決定されることになる。
【0006】
また、泥水には泥水受槽10から凝集沈殿槽2に圧送される途中に、凝集剤であるPACがPAC槽11からPAC添加ポンプ33により添加され、ラインミキサー14で混練されフロック化される。このフロック化された固体物は凝集沈殿槽2に貯留され、この固体物には、高分子凝集剤が高分子溶解槽12から高分子添加ポンプ32により添加されると共に、消石灰溶液が消石灰溶液槽13から消石灰添加ポンプ34により添加される。すると、凝集沈殿槽2に貯留された固体物は、さらに大きくフロック化され沈殿泥15として沈殿すると共に、凝集沈殿槽2の上部には高清浄度水16が分離され、この高清浄度水16は、凝集沈殿槽2内を区画した仕切板をオーバフローするように右端の凝集沈殿槽2の上部に流入する。
このように分離された高清浄度水16は、送水ポンプ40により濾過吸着手段50に送水される。一方、沈殿泥15は、移送ポンプ35によりスラリー貯泥槽17に移送され、また、右端の凝集沈殿槽2に沈殿した沈殿泥15aも移送ポンプ41によりスラリー貯泥槽17に圧送され、沈殿泥15と共に攪拌された後、打込ポンプ36により脱水装置3へ打ち込まれる。
【0007】
濾過吸着手段50は、砂を濾過材とする砂濾過槽51と、濾過処理水を貯留する濾過処理水受槽52と、活性炭を吸着材とする活性炭槽53と、吸着処理水を貯留する吸着処理水受槽54とから構成されている。
そして、前述した凝集沈殿槽2で分離された高清浄度水16は、まず、砂濾過材51aにより濾過処理され濾過処理水として濾過処理水受槽52に貯留される。この濾過処理水は、送水ポンプ38により活性炭槽53に送水され、活性炭吸着材53aによりダイオキシン類等の疎水性物質が吸着処理されて、吸着処理水として吸着処理水受槽54に貯留される。
この吸着処理水は、ダイオキシン類濃度、PH及び濁度等の水質が測定され、排出基準を満足していれば、放流ポンプ37により放流されることになる。
【0008】
脱水装置3は圧搾式フィルタプレスであり、スラリー貯泥槽17内の泥水は、圧搾式フィルタプレスに打込ポンプ36により所定の圧力で打ち込まれ圧搾脱水される。
そして、圧搾式フィルタプレスで圧搾脱水後、絞出された水は、脱水濾水槽19側にやや傾斜したベルトコンベア18に落下しその傾斜に沿って、脱水濾水槽19に貯留される。その後、脱水濾水槽19に貯留された泥水は、送水ポンプ39により、泥水受槽10まで送水され、再処理が行われる。
また、圧搾式フィルタプレスで圧搾脱水された低含水の土塊(脱水ケーキ)は、その後ベルトコンベア18に落下し、ベルトコンベア18を脱水濾水槽19側とは反対側に回転させて、土塊を土砂ピット20に回収する。
【0009】
また、特許文献1には、特に、第7システムにおいて、泥水を脱水装置で内部に充填された吸着濾布をもって脱水し、汚染濃度の低減された泥水は第8システムに送られ、この第8システムにおいて、所定の測定手段により有害物質が含まれていないことを確認後放流され、有害物質が存在すれば、その存在度合いに応じて前システムに戻されることが記載されている。
【0010】
【特許文献1】
特開2002−233859号公報
【0011】
【発明が解決しようとする課題】
上述したように、従来の浄化装置では、凝集沈殿槽で凝集されフロック化された沈殿泥を、脱水装置によって圧搾脱水し、絞出された水を全て泥水受槽に戻して再処理しているが、脱水装置から絞出された水は、大部分が清浄度の高い高清浄度水であり、この高清浄度水をも前工程に戻し再処理しているため処理効率が極めて良くない。さらに、浄化装置を構成する全ての設備が大型化することになり、経済的にも不利である。
【0012】
また、従来の浄化装置では、濾過吸着手段を、砂を濾過材とする砂濾過槽と、活性炭を吸着材とする活性炭槽とから構成して、高清浄度水を砂濾過材及び活性炭吸着材のそれぞれを通過させて処理している。しかし、高清浄度水を2種類の濾過及び吸着材を通過させるために、処理時間が大幅に増加し、濾過吸着手段に係る設備が大型化すると共に、設備費用も高額となる。
【0013】
また、特許文献1には、第7システムにおいて、泥水をフィルタプレス、ベルトプレス等の脱水装置で、内部に充填された吸着濾布をもって脱水し、汚染濃度が低減された泥水を次工程の第8システムに送り、この第8システムにおいて、所定の測定手段により有害物質が存在するか否かを判定しているが、有害物質が含有されている場合には、汚染濃度が低減された泥水を全て前システムに戻すことになるため、処理効率が悪く、まだ改善する余地がある。
【0014】
本発明は、かかる点に鑑みてなされたものであり、構成する各設備を小型化すると共に、効率良く疎水性物質を含んだ汚染土壌、又は排水を処理する浄化装置及び浄化方法を提供することを目的とする。
【0015】
【課題を解決するための手段】
本発明は、上記課題を解決するための手段として、請求項1に記載した汚染土壌を浄化する浄化装置の発明は、疎水性物質等の有害物質を含有する汚染土壌、又は排水を浄化する浄化装置において、汚染土壌、又は排水を基準径以下に分級した極小径粒子を凝集剤でフロック化して凝集沈殿させ、沈殿した沈殿泥を圧搾脱水する脱水装置と、該脱水装置により絞出された清浄度の高い高清浄度水と該高清浄度水より清浄度の低い低清浄度水とが接触しないようにそれぞれを回収する回収手段とを具備することを特徴とするものである。
このように構成することにより、脱水装置で絞出された高清浄度水と低清浄度水とが接触しないように、それぞれを回収する回収手段を備えたので、高清浄度水と低清浄度水のそれぞれを、回収手段を介して容易に所望の工程に送ることができる。
【0016】
請求項2に記載した汚染土壌を浄化する浄化装置の発明は、請求項1に記載した浄化装置の発明において、前記回収手段は、前記脱水装置から絞出される高清浄度水を回収すると共に水平にスライド可能な高清浄度水回収用シュートと、前記脱水装置から絞出される低清浄度水を回収するベルトコンベアとを具備し、これら高清浄度水回収用シュートとベルトコンベアとは、前記脱水装置の下方に上下に並設され、前記脱水装置から高清浄度水、または低清浄度水のいずれかが絞出される時、前記高清浄度水回収用シュートがスライドすると共に、前記脱水装置の直下には、絞出される高清浄度水、または低清浄度水に対応する前記高清浄度水回収用シュート、またはベルトコンベアのいずれかが配置されることを特徴とするものである。
このように構成することにより、回収手段を構成する高清浄度水回収用シュートとベルトコンベアを脱水装置の下方に上下に並設して、脱水装置の直下には、脱水装置から絞出される高清浄度水、または低清浄度水に対応して高清浄度水回収用シュート、またはベルトコンベアのいずれかが配置されるので、高清浄度水と低清浄度水とを接触させずに容易に回収することができる。
【0017】
請求項3に記載した汚染土壌を浄化する浄化装置の発明は、請求項1または2に記載した浄化装置の発明において、前記回収手段で回収した高清浄度水を濾過吸着材を介して浄化させる濾過吸着手段を設け、前記濾過吸着材は、疎水性物質を吸着すると共に、粒径が1μm〜5mmの粒状のものを積層して構成するか、あるいはスポンジ状の樹脂で構成することを特徴とするものである。
従来2種類の濾過吸着材を使用し2段階に分けて処理していたものを、上述のように1種類の濾過吸着材により構成したので、濾過吸着手段に係る設備を小型化できると共に、処理時間を大幅に短縮できる。
【0018】
請求項4に記載した汚染土壌を浄化する浄化方法の発明は、疎水性物質等の有害物質を含有する汚染土壌、又は排水を浄化する浄化方法において、汚染土壌、又は排水を基準径以下に分級した極小径粒子を凝集剤でフロック化して凝集沈殿させて、沈殿した沈殿泥を圧搾脱水して絞出された清浄度の高い高清浄度水と該高清浄度水より清浄度の低い低清浄度水とを接触しないように回収し、回収された高清浄度水を次工程に送ると共に、低清浄度水を前工程に戻すことを特徴とするものである。
従来方法では、分離された沈殿泥を圧搾脱水して絞出された水を全て前工程に戻して再処理していたのに対して、上述のように、沈殿泥を圧搾脱水して絞出された清浄度の高い高清浄度水を次工程に送ると共に、清浄度の低い低清浄度水だけを前工程に戻すので、処理時間を従来より大幅に短縮できると共に、浄化装置を構成する全設備を小型化することができる。
【0019】
【発明の実施の形態】
以下、本発明の実施の形態に係る浄化装置を図1〜図4に基いて詳細に説明する。なお、本発明の実施の形態の説明において従来例と同一部材及び相当する部品は、同一の符号を使用して、その説明を適宜省略する。
本発明の実施の形態に係る浄化装置は、図1に示すように、海底、又は河底等の疎水性物質例えばダイオキシン類が含有する底質から浚渫船により浚渫した汚染土壌を、基準径以下の粒子に分級する分級手段1と、この分級手段1で分級された極小径粒子をフロック化し凝集沈殿させ、沈殿泥15、15aと高清浄度水16とを分離させる凝集沈殿槽2と、この凝集沈殿槽2に沈殿した沈殿泥15、15aを圧搾脱水する脱水装置3と、この脱水装置3により絞出された清浄度の低い低清浄度水と清浄度の高い高清浄度水16’とが接触しないようにそれぞれを回収する回収手段4と、凝集沈殿槽2で分離した高清浄度水16と回収手段4で回収された高清浄度水16’とを濾過吸着材23bを介して浄化する濾過吸着手段5とから構成されている。
【0020】
ここで、高清浄度水とは、透視度が高く、SS濃度が約100mg/L未満の水に相当し、低清浄度水とは、透視度が低く、SS濃度が約100mg/L以上の水に相当する。
また、上述した構成の分級手段1、凝集沈殿槽2及び脱水装置3は、従来例と同一のため、ここでの説明を省略する。
【0021】
回収手段4は、図1〜図3に示すように、脱水装置3の圧搾式フィルタプレスから絞出される高清浄度水(低清浄度水が絞出された直後から最後まで絞出される水)を回収する水平にスライド可能な高清浄度水回収用シュート61と、脱水装置3から絞出される低清浄度水(圧搾開始時に絞出される水)及び脱水装置3で圧搾脱水された土塊を回収するベルトコンベア62とから構成されている。これらの高清浄度水回収用シュート61とベルトコンベア62は、圧搾式フィルタプレスが載置する型材で骨組された架台64に配設されている。また、高清浄度水回収用シュート61及びベルトコンベア62の両側方には、高清浄度水16’を貯留する高清浄度水槽21と脱水装置3で圧搾脱水された土塊を集積する土砂ピット20がそれぞれ配設されている。さらに、高清浄度水槽21の近傍には、低清浄度水を貯留する低清浄度水槽22が配設されている。
【0022】
高清浄度水回収用シュート61は、図2及び図3に示すように、圧搾式フィルタプレスの下方で、高清浄度水16’が落下する圧搾式フィルタプレスの落下口3aに対向すると共に、高清浄度水槽21側にやや傾いて配設されている。この高清浄度水回収用シュート61の高清浄度水槽21側の先端底には、高清浄度水槽21と連通する連通管66が装着されている。また、架台64には、ローラ受部材65が、左右方向(高清浄度水回収用シュート61の短手側方向)に複数(図2では5本)所定の間隔を設け延設されており、このローラ受部材65に、高清浄度水回収用シュート61をスライド可能とする高清浄度水槽21方向に延在するローラ61aが複数(図3では7本)連結されている。さらに、この高清浄度水回収用シュート61の一方の長手側側壁には、駆動ジャッキ67が連結され、図示しない駆動源により駆動ジャッキ67が伸縮することにより、高清浄度水回収用シュート61が左右方向に移動可能となる。
【0023】
ベルトコンベア62は、図3に示すように、断面視において低清浄度水及び土塊を受ける受け部63が形成されており、高清度水回収用シュート61の下方で、低清浄度水槽22側にやや傾斜して配設されている。また、ベルトコンベア62の低清浄度水槽22側の端部には、低清浄度水槽22と連通する図示しない連通管が装着されている。
【0024】
濾過吸着手段5は、図1に示すように、濾過吸着材23bを備えた濾過吸着槽23と、この濾過吸着槽23に並設すると共に、濾過吸着材23bにより濾過吸着処理された濾過吸着処理水を貯留する濾過吸着水受槽24とから構成されている。また、濾過吸着槽23の上部には、凝集沈殿槽2で分離された高清浄度水16、及び脱水装置3から絞出された高清浄度水16’内の微細物を取り除く金網(開口ピッチ:106μm)23a、23aが配設されている。
なお、この金網23a、23aは、高清浄度水16、16’の清浄度が高い場合には、設置しなくてもよい。
【0025】
濾過吸着材23bは、スポンジ状のウレタン樹脂、または250μm≦粒径<850μmの活性炭の粒子、250μm≦粒径<850μmのポリアクリル酸エステル架橋重合体の粒子、250μm≦粒径<850μmのゼオライトの粒子、のいずれかの粒子を積層して構成されている。
【0026】
ここで、上記の各濾過吸着材及び従来の濾過吸着材の濾過吸着効果を図4に基いて説明する。図4は、被処理水(ダイオキシン類濃度:24pg−TEQ/L)を各濾過吸着材で処理し、処理後のダイオキシン類濃度を示したものである。
図4に示すように、各濾過吸着材で処理した後、全ての処理水のダイオキシン類濃度は、約0.11〜0.15pg−TEQ/Lの範囲に入っており、排水基準(ダイオキシン類濃度:10pg−TEQ/L以下)、及び環境基準(ダイオキシン類濃度:1pg−TEQ/L以下)を満足している。
したがって、上記の濾過吸着材のいずれかを使用することにより排水基準、及び環境基準を満足することが可能である。この実施の形態では、吸着効率面、費用面及び取扱易さ面からスポンジ状のウレタン樹脂を採用している。
【0027】
次に、海底、又は河底の疎水性物質が含有した底質から浚渫船により掘削した汚染土壌を浄化する浄化方法を図1に基いて説明する。ここで、分級手段から脱水装置までの工程は、従来例と同一のため詳細な説明を省略する。
疎水性物質が含有した底質から掘削した汚染土壌は、分級手段1により極小径粒子に分級され、従来と同様にこの極小径粒子は凝集沈殿槽2に圧送され、凝集沈殿槽2で高清浄度水(ダイオキシン類濃度:約15pg−TEQ/L)16と沈殿泥(ダイオキシン類濃度:約2000pg−TEQ/g)15、15aとに分離される。
ここで、分級手段1の振動篩6内の泥粒子等を洗浄する洗浄水は、後述する濾過吸着手段5の濾過吸着水受槽24に貯留した濾過吸着処理水の一部を送水ポンプ42a、30により洗浄水槽6aを介して送水される。また、濾過吸着材23bであるウレタン樹脂に付着したSS等の洗浄は、後で詳述するが送水ポンプ42cから送水される濾過吸着処理水で内部洗浄され、また送水ポンプ42bから送水される濾過吸着処理水を表面洗浄装置である複数のノズル23cからジェット噴射して表面洗浄し、その後の洗浄汚水は、泥水受槽10に戻され再処理が行われる。
【0028】
凝集沈殿槽2で沈殿した沈殿泥15、15aは、従来と同様にスラリー貯留槽17を介して、打込ポンプ36により脱水装置3の圧搾式フィルタプレスに打ち込まれ、圧搾脱水される。
圧搾脱水時、圧搾初期に絞出された低清浄度水を回収する時は、高清浄度水回収用シュート61を圧搾式フィルタプレスの落下口3aから離間するように左右方向に移動させて、落下口3aの真下にはベルトコンベア62のみを配置する。そして、絞出された低清浄度水はベルトコンベア62の受け部63に落下しその傾斜に沿って、図示しない連通管を経由して低清浄度水槽22に貯留される。
そして、低清浄度水槽22内の低清浄度水はポンプ43により泥水受槽10に送られ、再び凝集処理が行われることになる。このように回収された低清浄度水の量は、脱水装置3に打ち込まれた沈殿泥15、15aの量の約5〜6%程度の量に相当する。
【0029】
また低清浄度水が絞出された後に絞出される高清浄度水16’を回収する時は、高清浄度水回収用シュート61を左右方向に移動させて圧搾式フィルタプレスの落下口3aの真下に配置して、高清浄度水16’を高清浄度水回収用シュート61の溝部に落下させてその傾斜に沿って高清浄度水槽21に貯留する。このように回収された高清浄度水16’の量は、脱水装置3に打ち込まれた沈殿泥15、15aの量の約80%の量に相当する。
【0030】
さらに、高清浄度水16’の回収が終了した後は、再び高清浄度水回収用シュート61を落下口3aから離間するように左右方向に移動させて、圧搾式フィルタプレスの落下口3aの直下には、ベルトコンベア62を配設して、圧搾式フィルタプレスで圧搾脱水された土塊が、その落下口3aからベルトコンベア62の受け部63に落下する。そして、ベルトコンベア62を土砂ピット20側に回転させて、土塊を土砂ピット20に排出する。
【0031】
次に、凝集沈殿層2で分離された高清浄度水16、及び脱水装置3により回収された高清浄度水16’は、送水ポンプ40、42により濾過吸着手段5に送水される。すなわち、高清浄度水16、16’は、金網23a、23aを経由して、濾過吸着槽23に設けた濾過吸着材23bのスポンジ状のウレタン樹脂にて処理され、濾過吸着処理水としてパイプ25から濾過吸着水受槽24に貯留される。この濾過吸着水受槽24に貯留された濾過吸着処理水は、ダイオキシン類濃度、PH、及び濁度等の水質が測定され、排水基準を満足していれば、放流ポンプ42より放流されることになる。
【0032】
ここで、濾過吸着手段5の保守管理として、濾過吸着材23bのウレタン樹脂の表面を洗浄するために、濾過吸着水受槽24に貯留した濾過吸着処理水の一部を圧送ポンプ42bにより濾過吸着槽23の側壁上端から注入し、側壁に設けた表面洗浄装置の複数のノズル23cからウレタン樹脂の表面にジェット噴射で表面洗浄している。また、濾過吸着槽23内の濾過吸着材23bのウレタン樹脂の内部洗浄は、濾過吸着処理水の一部を送水ポンプ42cによりパイプ25内を逆流させて洗浄している。なお、濾過吸着処理と洗浄作業の切換え時には、パイプ25に備えた図示しないストップバルブを作動させる。このストップバルブの作動方法は、濾過吸着処理時には開け、表面洗浄時には閉じ、内部洗浄前に送水ポンプ42cとパイプ25とを連絡後開けることにより行う。
【0033】
以上説明したように、本発明の実施の形態に係る浄化装置によれば、特に、凝集沈殿槽2で沈殿した沈殿泥15、15aを圧搾脱水する脱水装置3と、この脱水装置3の圧搾式フィルタプレスから絞出された高清浄度水16’を回収する高清浄度水回収用シュート61と、同様に絞出された低清浄度水及び圧搾脱水された土塊を回収するベルトコンベア62と、1種類の濾過吸着材23bにより構成された濾過吸着手段5とを具備したので、圧搾式フィルタプレスから絞出された高清浄度水16’を高清浄度水回収用シュート61で回収し、濾過吸着手段5の濾過吸着材23bに送り浄化することができる。このように沈殿泥15、15aの量の約80%にも相当する高清浄度水16’を濾過吸着手段5の濾過吸着材23bに送り浄化するので、従来沈殿泥15、15aから絞出された水を全て前工程に戻していたのに対して、処理時間を大幅に短縮できると共に、浄化装置を構成する全設備の小型化を達成できる。
【0034】
また、濾過吸着手段5の濾過吸着材23bをスポンジ状のウレタン樹脂の1種類で構成し排水基準、及び環境基準を満足できるので、従来2種類の濾過吸着材51a、53aを使用し2段階に分けて処理していたのに対して、処理時間を短縮できると共に、濾過吸着手段5に係る設備の小型化を達成することができる。
【0035】
また、本発明の実施の形態に係る浄化方法によれば、凝集沈殿槽2で沈殿した沈殿泥15、15aを、脱水装置3の圧搾式フィルタプレスで圧搾脱水し、絞出された、沈殿泥15、15aの量の約80%にも相当する高清浄度水16’を、次工程の濾過吸着手段5の濾過吸着材23bに送り浄化すると共に、同様に絞出された低清浄度水を、前工程の泥水受槽10に戻し再処理するので、処理時間を従来より大幅に短縮できると共に、浄化装置を構成する全設備の小型化を達成できる。
【0036】
なお、本発明の実施の形態では、疎水性物質をダイオキシン類として説明したが、ダイオキシン類以外の疎水性物質にも、本発明の浄化装置及び浄化方法を採用することができる。
【0037】
【発明の効果】
以上説明したように、請求項1に記載した汚染土壌を浄化する浄化装置の発明によれば、汚染土壌、又は排水を基準径以下に分級した極小径粒子を凝集剤でフロック化して凝集沈殿させ、その沈殿泥を圧搾脱水する脱水装置と、この脱水装置から絞出された低清浄度水と高清浄度水とを接触しないようにそれぞれを回収する回収手段とを具備し、脱水装置から絞出された低清浄度水と高清浄度水とを回収手段を介して接触させずに、低清浄度水は前工程に戻し、高清浄度水は次工程に送れるので、処理時間を従来より大幅に短縮することが可能となり、浄化装置を構成する全設備を小型化でき、トータルコストの削減を達成することができる。
【0038】
請求項2に記載した汚染土壌を浄化する浄化装置の発明によれば、回収手段を左右にスライド可能な高清浄度水回収用シュートとベルトコンベアとから構成し、これらの高清浄度水回収用シュートとベルトコンベアを脱水装置の下方に上下に並設し、脱水装置の直下には、脱水装置から絞出される高清浄度水、または低清浄度水に対応して高清浄度水回収用シュート、またはベルトコンベアのいずれかが配置されるので、高清浄度水と低清浄度水とを接触させずに容易に回収することができる。
【0039】
請求項3に記載した汚染土壌を浄化する浄化装置の発明によれば、回収手段で回収した高清浄度水を浄化させる濾過吸着材を、疎水性物質を吸着すると共に、粒径が1μm〜5mmの粒状のものを積層して構成するか、あるいはスポンジ状の樹脂により構成したので、1種類の濾過吸着材により排水基準、及び環境基準を満足させるので、処理時間を従来より大幅に短縮できると共に、濾過吸着手段に係る設備を小型化することが可能となる。
【0040】
請求項4に記載した汚染土壌を浄化する浄化方法の発明によれば、汚染土壌、又は排水を基準径以下に分級した極小径粒子を凝集剤でフロック化して凝集沈殿させて、沈殿泥と清浄度の高い高清浄度水とに分離し、分離した沈殿泥を圧搾脱水して絞出された清浄度の高い高清浄度水を次工程に進ませると共に、同様に絞出された低清浄度水を前工程に戻すので、処理時間を従来より大幅に短縮できると共に、浄化装置を構成する全設備を小型化することができる。
【図面の簡単な説明】
【図1】図1は、本発明の実施の形態に係る汚染土壌を浄化する浄化装置を示す模式図である。
【図2】図2は、本発明の実施の形態に係る汚染土壌を浄化する浄化装置の構成である回収手段を示す正面図である。
【図3】図3は、本発明の実施の形態に係る汚染土壌を浄化する浄化装置の構成である回収手段を示す側面図である。
【図4】図4は、本発明の実施の形態に係る汚染土壌を浄化する浄化装置の構成である濾過吸着材の処理効果を示すものである。
【図5】図5は、従来の汚染土壌を浄化する浄化装置を示す模式図である。
【符号の説明】
3 脱水装置
4 回収手段
5 濾過吸着手段
23b 濾過吸着材
16、16’高清浄度水
61 高清浄度水回収用シュート
62 ベルトコンベア
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a purification device and a purification method for removing hydrophobic substances contained in sediment such as the seabed or riverbed.
[0002]
[Prior art]
Construction wastewater contains various hydrophobic harmful substances, and in wastewater containing these hydrophobic substances, solids settle out and form sediment in places where the flow is gentle, and hydrophobic substances are difficult to dissolve in water. Due to the dissolution, sediment in which a high concentration of the hydrophobic substance is accumulated is formed. In particular, the small-particle-size solid and the organic matter in the sediment contain a large amount of a hydrophobic substance including dioxins because the surface area per unit volume is very large.
[0003]
Therefore, a conventional purification apparatus for purifying the sediment of the seabed or riverbed contaminated in this way will be described with reference to FIG.
A conventional purification device is provided with a classification means 1 for classifying contaminated soil excavated by a dredger from sediment containing a hydrophobic substance such as dioxins on the seabed or a riverbed into particles having a diameter equal to or smaller than a reference diameter. Coagulated sedimentation tank 2 for flocculating and coagulating and sedimenting the classified ultra-small particles, and sedimentation sediments 15 and 15a sedimented in this coagulation sedimentation tank 2 by pressing and dewatering. The dewatering device 3 is roughly constituted by a filtration / adsorption means 50 for filtering and adsorbing the high-purity water 16 separated by the coagulation / sedimentation tank 2.
[0004]
The classifying means 1 is composed of a vibrating sieve 6 and a cyclone 7, and dredging sediment such as the sea bottom or a river bottom by a dredger, and transporting the sediment by pipes. (Particle size ≧ 2 mm) and medium-sized particles (particle size <2 mm) to which moisture containing high concentration of dioxins etc. adheres. The medium-sized particles are in the muddy water receiving tank 8, and the large-sized particles are coarse-grained soil. It is stored in the recovery tank 9. At this time, washing water is pumped from the washing water tank 6a to the vibrating sieve 6 by the washing water pump 30 to wash mud particles and the like. A part of the adsorption treatment water stored in the adsorption treatment water receiving tank 54 of the filtration / adsorption means 50 described later is supplied to the washing water tank 6a as washing water by the water supply pump 37a.
[0005]
Next, the medium-sized particles stored in the muddy water receiving tank 8 are further classified by the cyclone 7, and the classified ultra-small particles (particle diameter <74 μm) are stored in the muddy water receiving tank 10 and small-sized particles (74 μm ≦ particle diameter < 2 mm) is stored in the coarse-grained soil recovery tank 9. Further, to the muddy water receiving tank 10, washed sewage generated when the sand filtration water tank 51 and the activated carbon tank 53 of the filtration / adsorption means 50 described later are washed with the respective treated waters sent by the water feed pumps 52 a and 54 a is sent under pressure. The muddy water is uniformly stirred with the ultra-small particles, and the muddy water is pumped to the coagulation sedimentation tank 2 by the transfer pump 31. Here, when classifying based on the respective particle diameters, the reference diameter is appropriately determined by examining the relationship between the particle diameter and the dioxin content in advance.
[0006]
In addition, PAC, which is a coagulant, is added from the PAC tank 11 by the PAC addition pump 33 to the muddy water while being pressure-fed from the muddy water receiving tank 10 to the coagulation sedimentation tank 2, and is kneaded by the line mixer 14 and flocculated. The flocculated solid is stored in the flocculating sedimentation tank 2, and a polymer flocculant is added to the solid from the polymer dissolving tank 12 by the polymer addition pump 32, and the slaked lime solution is poured into the slaked lime solution tank From 13, it is added by slaked lime addition pump 34. Then, the solid matter stored in the coagulation sedimentation tank 2 is further flocculated and settled as sedimentation sludge 15, and the high-purity water 16 is separated at the upper part of the coagulation-sedimentation tank 2. Flows into the upper part of the coagulating sedimentation tank 2 at the right end so as to overflow the partition plate that partitions the inside of the coagulation sedimentation tank 2.
The high-purity water 16 thus separated is sent to the filtration / adsorption means 50 by the water pump 40. On the other hand, the sediment sludge 15 is transferred to the slurry storage tank 17 by the transfer pump 35, and the sediment 15 a settled in the coagulation settling tank 2 at the right end is also pressure-fed to the slurry storage tank 17 by the transfer pump 41. After being stirred with 15, it is driven into the dehydrating device 3 by the driving pump 36.
[0007]
The filtration and adsorption means 50 includes a sand filtration tank 51 using sand as a filtering material, a filtration water receiving tank 52 for storing filtration water, an activated carbon tank 53 using activated carbon as an adsorbent, and an adsorption processing for storing adsorption water. And a water receiving tank 54.
The high-purity water 16 separated in the coagulation sedimentation tank 2 is first filtered by the sand filter material 51a and stored in the filtered water receiving tank 52 as filtered water. The filtered water is sent to the activated carbon tank 53 by the water feed pump 38, and the activated carbon adsorbent 53a absorbs a hydrophobic substance such as dioxins, and is stored in the adsorbed water receiving tank 54 as the adsorbed water.
The water quality such as dioxin concentration, pH, turbidity and the like is measured from this adsorption treatment water, and if the water satisfies the discharge standard, it is discharged by the discharge pump 37.
[0008]
The dewatering device 3 is a squeeze type filter press, and muddy water in the slurry storage tank 17 is driven into the squeeze type filter press at a predetermined pressure by a driving pump 36 to be squeezed and dewatered.
After being squeezed and dewatered by a squeeze filter press, the squeezed water falls on a belt conveyor 18 that is slightly inclined toward the dewatering and filtration tank 19 and is stored in the dewatering and filtration tank 19 along the inclination. Thereafter, the muddy water stored in the dewatering / filtration tank 19 is sent to the muddy water receiving tank 10 by the water supply pump 39, and is reprocessed.
Further, the low water content soil mass (dewatered cake) squeezed and dewatered by the squeezing type filter press then falls onto the belt conveyor 18, and rotates the belt conveyor 18 to the opposite side to the dewatering and drainage tank 19 side so that the earth mass is soiled. Collect in pit 20.
[0009]
Further, Patent Document 1 discloses that, in the seventh system, in particular, in the seventh system, the muddy water is dehydrated by using an adsorption filter cloth filled therein with a dehydrating device, and the muddy water having a reduced contamination concentration is sent to the eighth system. The document describes that the system is released after confirming that no harmful substance is contained by a predetermined measuring means, and if a harmful substance is present, it is returned to the previous system according to the degree of its existence.
[0010]
[Patent Document 1]
JP-A-2002-233859
[0011]
[Problems to be solved by the invention]
As described above, in the conventional purification device, the sedimented sludge flocculated by flocculation in the coagulation sedimentation tank is squeezed and dewatered by the dewatering device, and all the squeezed water is returned to the muddy water receiving tank for reprocessing. Most of the water squeezed out of the dehydrating apparatus is high cleanliness water having high cleanliness, and the high cleanliness water is also returned to the previous process and reprocessed, so that the treatment efficiency is extremely poor. Further, all the equipment constituting the purifying apparatus is increased in size, which is economically disadvantageous.
[0012]
Further, in the conventional purification device, the filtration and adsorption means is constituted by a sand filtration tank using sand as a filtering material and an activated carbon tank using activated carbon as an adsorbing material, so that high-purity water is supplied to the sand filtering material and the activated carbon adsorbing material. Are processed by passing through each of them. However, since high-purity water passes through two types of filtration and adsorbents, the processing time is greatly increased, the equipment related to the filtration and adsorption means is increased in size, and the equipment cost is also high.
[0013]
Further, in Patent Document 1, in the seventh system, muddy water is dehydrated by a dewatering device such as a filter press or a belt press with an adsorption filter cloth filled therein, and the muddy water having a reduced concentration of contamination is removed in the next step. 8 system, and in the eighth system, it is determined whether or not a harmful substance is present by a predetermined measuring means. Since all the processing is returned to the previous system, the processing efficiency is poor and there is still room for improvement.
[0014]
The present invention has been made in view of the above points, and provides a purification device and a purification method for reducing the size of each of the constituent devices and efficiently treating contaminated soil or wastewater containing a hydrophobic substance. With the goal.
[0015]
[Means for Solving the Problems]
As a means for solving the above-mentioned problems, the present invention provides a purification apparatus for purifying contaminated soil according to claim 1, wherein the purification apparatus purifies contaminated soil containing harmful substances such as hydrophobic substances or wastewater. In the apparatus, contaminated soil, or ultra-small particles obtained by classifying contaminated wastewater to a reference diameter or less, flocculate and coagulate and settle with a coagulant, and a dewatering device for compressing and dewatering the sedimented sediment, and a cleaning device squeezed out by the dewatering device. It is characterized by comprising a collecting means for collecting high-purity water with high purity and low-cleanness water with lower cleanness than the high-purity water so as not to come into contact with each other.
With such a configuration, since the high-purity water and the low-cleanliness water are provided so as to prevent the high-purity water and the low-purity water squeezed out by the dehydrator from coming into contact with each other, the high-purity water and the low-cleanliness water are provided. Each of the water can be easily sent to the desired process via the recovery means.
[0016]
The invention of a purification apparatus for purifying contaminated soil according to claim 2 is the invention of the purification apparatus according to claim 1, wherein the recovery means collects high-purity water squeezed out from the dehydration apparatus and horizontally collects the water. A high-cleanliness water recovery chute slidable to the water, and a belt conveyor for recovering the low-cleanliness water squeezed from the dewatering device. When one of high-purity water or low-purity water is squeezed out of the dehydrator, the chute for collecting high-purity water slides, and the water of the dehydrator is removed. Immediately below, one of the chute for collecting high-purity water or the belt conveyor corresponding to the high-purity water or low-purity water to be squeezed is disposed.
With this configuration, the high-purity water recovery chute and the belt conveyor that constitute the recovery means are vertically arranged below the dehydrator, and immediately below the dehydrator, the high-pressure water squeezed out of the dehydrator is disposed. Either the high-purity water recovery chute or the belt conveyor is arranged corresponding to the high-purity water or low-purity water. Can be recovered.
[0017]
The invention of a purification device for purifying contaminated soil according to claim 3 is the invention of the purification device according to claim 1 or 2, wherein the high-purity water recovered by the recovery means is purified via a filtration adsorbent. A filtration / adsorption means is provided, wherein the filtration / adsorption material adsorbs a hydrophobic substance and has a particle size of 1 μm to 5 mm and is formed by laminating or a sponge-like resin. Is what you do.
What has been conventionally processed in two stages using two types of filtration adsorbents has been constituted by one type of filtration adsorbent as described above, so that the equipment relating to the filtration and adsorption means can be reduced in size and the processing can be reduced. Time can be greatly reduced.
[0018]
The invention of a purification method for purifying contaminated soil according to claim 4 is a method for purifying contaminated soil or effluent containing a harmful substance such as a hydrophobic substance. The ultra-small particles obtained are flocculated with a flocculant to cause coagulation and sedimentation, and the sedimented sediment is squeezed and dewatered and squeezed out. It is characterized by collecting the clean water without contact with the clean water, sending the collected clean water to the next step, and returning the clean water to the previous step.
In the conventional method, the separated sedimentary sludge was pressed and dewatered, and all the water squeezed out was returned to the previous step and reprocessed. On the other hand, as described above, the sedimentary sludge was pressed and dewatered and squeezed out. The high cleanliness water with high cleanliness is sent to the next process, and only the low cleanliness water with low cleanliness is returned to the previous process. Equipment can be miniaturized.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a purification device according to an embodiment of the present invention will be described in detail with reference to FIGS. In the description of the embodiments of the present invention, the same members and corresponding parts as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
The purification device according to the embodiment of the present invention, as shown in FIG. 1, a contaminated soil dredged by a dredge from a sediment containing a hydrophobic substance such as a seabed or a riverbed, such as dioxins, with a reference diameter or less. A classifying means 1 for classifying the particles, a flocculent sedimentation tank 2 for flocculating and coagulating and sedimenting the ultra-small particles classified by the classifying means 1, and separating the sediment sludges 15 and 15a from the high-purity water 16; A dewatering device 3 for compressing and dewatering the sedimentation sludge 15 and 15a settled in the sedimentation tank 2 and a low-purity low-purity water and a high-purity high-purity water 16 ′ squeezed out by the dehydration device 3 are provided. The recovery means 4 for recovering each of them so as not to come into contact with each other, the high cleanliness water 16 separated in the coagulation sedimentation tank 2 and the high cleanliness water 16 'recovered in the recovery means 4 are purified through the filtration adsorbent 23b. And filtration and adsorption means 5 That.
[0020]
Here, high cleanliness water corresponds to water having high transparency and an SS concentration of less than about 100 mg / L, and low cleanliness water has low transparency and an SS concentration of about 100 mg / L or more. Equivalent to water.
Further, the classifying means 1, the coagulating sedimentation tank 2, and the dehydrating device 3 having the above-described configuration are the same as those in the conventional example, and thus description thereof will be omitted.
[0021]
As shown in FIGS. 1 to 3, the recovery means 4 is a high-purity water squeezed from a squeeze-type filter press of the dewatering device 3 (water squeezed from immediately after the low-cleanness water is squeezed to the end). A horizontally slidable high-cleanliness water recovery chute 61 for recovering water, low-cleanliness water (water squeezed at the start of pressing) squeezed from the dewatering device 3, and soil depressed and dewatered by the dewatering device 3 are recovered. And a belt conveyer 62 that performs the operation. The chute 61 for high-purity water recovery and the belt conveyor 62 are arranged on a gantry 64 framed by a mold on which a squeeze-type filter press is mounted. Also, on both sides of the high-purity water recovery chute 61 and the belt conveyor 62, a high-purity water tank 21 for storing the high-purity water 16 'and a sediment pit 20 for accumulating the soil depressed and dewatered by the dewatering device 3. Are arranged respectively. Further, a low-purity water tank 22 for storing low-purity water is provided near the high-purity water tank 21.
[0022]
As shown in FIGS. 2 and 3, the high-purity water collecting chute 61 faces the falling port 3 a of the squeezable filter press where the high-cleanliness water 16 ′ falls below the squeezable filter press, It is arranged slightly inclined to the high cleanliness water tank 21 side. A communication pipe 66 communicating with the high-purity water tank 21 is attached to the bottom of the high-purity water recovery chute 61 on the high-purity water tank 21 side. Further, a plurality of (five in FIG. 2) predetermined intervals are provided on the gantry 64 to extend and extend in the left and right direction (the short side direction of the high-purity water collecting chute 61), and the roller receiving member 65 is extended. A plurality (seven in FIG. 3) of rollers 61 a extending in the direction of the high-purity water tank 21 that allows the high-purity water recovery chute 61 to be slidable are connected to the roller receiving member 65. Further, a driving jack 67 is connected to one longitudinal side wall of the high-purity water collecting chute 61, and the driving jack 67 expands and contracts by a driving source (not shown). It is possible to move left and right.
[0023]
As shown in FIG. 3, the belt conveyor 62 is formed with a receiving portion 63 that receives low-cleanliness water and soil mass in a cross-sectional view, and is provided below the high-purity water collecting chute 61 toward the low-purity water tank 22. It is arranged slightly inclined. A communication pipe (not shown) that communicates with the low-purity water tank 22 is attached to an end of the belt conveyor 62 on the low-purity water tank 22 side.
[0024]
As shown in FIG. 1, the filtration / adsorption means 5 includes a filtration / adsorption tank 23 provided with a filtration / adsorption material 23b, and a filtration / adsorption process which is juxtaposed to the filtration / adsorption tank 23 and which is subjected to filtration / adsorption treatment by the filtration / adsorption material 23b. And a filtration / adsorption water receiving tank 24 for storing water. In addition, a wire mesh (opening pitch) for removing fine matter in the high-purity water 16 separated in the coagulation-sedimentation tank 2 and the high-purity water 16 ′ squeezed from the dewatering device 3 is provided above the filtration adsorption tank 23. : 106 μm) 23a, 23a are provided.
The wire nets 23a, 23a need not be installed when the cleanliness water 16, 16 'has high cleanliness.
[0025]
The filtration adsorbent 23b is made of a sponge-like urethane resin or particles of activated carbon having a particle size of 250 μm ≦ particle size <850 μm, particles of a crosslinked polymer of a polyacrylate ester having a particle size of 250 μm ≦ particle size <850 μm, or a zeolite having a particle size of 250 μm ≦ particle size <850 μm. And any one of the particles is laminated.
[0026]
Here, the filtration and adsorption effect of each of the above-mentioned filtration adsorbents and the conventional filtration adsorbent will be described with reference to FIG. FIG. 4 shows the concentration of dioxins after treatment of the water to be treated (dioxins concentration: 24 pg-TEQ / L) with each filtration adsorbent.
As shown in FIG. 4, after treatment with each filtration adsorbent, the concentration of dioxins in all of the treated water falls within the range of about 0.11 to 0.15 pg-TEQ / L, and the wastewater standard (dioxins Concentration: 10 pg-TEQ / L or less) and environmental standards (dioxins concentration: 1 pg-TEQ / L or less).
Therefore, it is possible to satisfy drainage standards and environmental standards by using any of the above-mentioned filtration adsorbents. In this embodiment, a sponge-like urethane resin is employed in terms of adsorption efficiency, cost, and ease of handling.
[0027]
Next, a purification method for purifying contaminated soil excavated by a dredge from seabed or riverbed sediment containing a hydrophobic substance will be described with reference to FIG. Here, the steps from the classification means to the dehydrator are the same as those in the conventional example, and therefore, detailed description is omitted.
The contaminated soil excavated from the sediment containing the hydrophobic substance is classified into ultra-small particles by the classification means 1, and the ultra-small particles are pumped to the coagulation sedimentation tank 2 as in the past, and highly purified in the coagulation sedimentation tank 2. Water (dioxin concentration: about 15 pg-TEQ / L) 16 and sediment (dioxin concentration: about 2000 pg-TEQ / g) 15, 15a are separated.
Here, the washing water for washing the mud particles and the like in the vibrating sieve 6 of the classification means 1 is a part of the filtration and adsorption treatment water stored in the filtration and adsorption water receiving tank 24 of the filtration and adsorption means 5 to be described later. Is supplied through the washing water tank 6a. The washing of the SS and the like adhering to the urethane resin, which is the filtration adsorbent 23b, will be described in detail later. The inside is washed with the filtration and adsorption treatment water supplied from the water supply pump 42c, and the filtration supplied from the water supply pump 42b. The surface is cleaned by jetting the adsorption treated water from a plurality of nozzles 23c, which are surface cleaning devices, and the washed sewage is returned to the muddy water receiving tank 10 and reprocessed.
[0028]
The sedimentary sediments 15 and 15a settled in the coagulation sedimentation tank 2 are driven into the press-type filter press of the dewatering device 3 by the driving pump 36 via the slurry storage tank 17 in the same manner as in the prior art, and are pressed and dewatered.
At the time of squeezing dehydration, when collecting low-cleanliness water squeezed out at the beginning of squeezing, the chute 61 for collecting high-cleanliness water is moved in the left-right direction so as to be separated from the drop port 3a of the squeezing filter press, Only the belt conveyor 62 is disposed directly below the falling port 3a. Then, the squeezed low-cleanliness water falls into the receiving portion 63 of the belt conveyor 62 and is stored in the low-cleanliness water tank 22 along a slope thereof through a communication pipe (not shown).
Then, the low-purity water in the low-purity water tank 22 is sent to the muddy water receiving tank 10 by the pump 43, and the flocculation treatment is performed again. The amount of the low-cleanliness water collected in this manner corresponds to about 5 to 6% of the amount of the sediment sludge 15 or 15a injected into the dewatering device 3.
[0029]
When recovering the high-purity water 16 'squeezed after the low-purity water is squeezed out, the high-purity water collecting chute 61 is moved in the left-right direction to move the high-purity water collecting drop 61a of the falling port 3a of the squeeze-type filter press. The high-purity water 16 ′ is disposed directly below and drops into the groove of the high-purity water collecting chute 61, and is stored in the high-purity water tank 21 along the inclination thereof. The amount of the high-purity water 16 ′ thus collected corresponds to about 80% of the amount of the sedimentation sludge 15, 15 a injected into the dewatering device 3.
[0030]
Further, after the recovery of the high cleanliness water 16 'is completed, the high cleanliness water recovery chute 61 is moved in the left-right direction again so as to be separated from the fallout port 3a, so that the fallout port 3a of the squeeze-type filter press is moved. Immediately below, a belt conveyor 62 is provided, and the lumps squeezed and dewatered by the squeeze filter press fall from the falling port 3a to the receiving portion 63 of the belt conveyor 62. Then, the belt conveyor 62 is rotated toward the earth and sand pit 20 to discharge the earth mass into the earth and sand pit 20.
[0031]
Next, the high cleanliness water 16 separated by the coagulated sedimentation layer 2 and the high cleanliness water 16 ′ collected by the dehydrating device 3 are sent to the filtration and adsorption means 5 by the water sending pumps 40 and 42. That is, the high cleanliness water 16, 16 'is treated with the sponge-like urethane resin of the filtration adsorbent 23b provided in the filtration adsorption tank 23 via the wire meshes 23a, 23a, and the pipe 25 is used as filtration adsorption treated water. From the filtered and adsorbed water receiving tank 24. The filtered and adsorbed treated water stored in the filtered and adsorbed water receiving tank 24 is discharged from the discharge pump 42 if the water quality such as dioxin concentration, PH, and turbidity is measured, and meets the drainage standard. Become.
[0032]
Here, as a maintenance management of the filtration and adsorption means 5, in order to clean the surface of the urethane resin of the filtration and adsorption material 23b, a part of the filtration and adsorption treatment water stored in the filtration and adsorption water receiving tank 24 is filtered by the pressure pump 42b. The surface of the urethane resin is jet-cleaned from a plurality of nozzles 23c of the surface cleaning device provided on the side wall and jet-sprayed. In addition, in the internal cleaning of the urethane resin of the filtration adsorbent 23b in the filtration adsorption tank 23, a part of the filtration adsorption treatment water is flowed back through the pipe 25 by the water supply pump 42c for cleaning. At the time of switching between the filtration and adsorption treatment and the washing operation, a stop valve (not shown) provided on the pipe 25 is operated. The operation method of the stop valve is performed by opening the filter during the adsorption treatment, closing the surface during the surface cleaning, and opening the communication between the water supply pump 42c and the pipe 25 before the internal cleaning.
[0033]
As described above, according to the purification device according to the embodiment of the present invention, in particular, the dewatering device 3 for pressing and dewatering the sediment sludge 15, 15a settled in the coagulation sedimentation tank 2, and the pressing type of the dewatering device 3 A high-purity water recovery chute 61 for recovering the high-purity water 16 ′ squeezed from the filter press, a belt conveyor 62 for collecting similarly squeezed low-cleanliness water and crushed and dewatered lumps, Since it is provided with the filtration and adsorption means 5 constituted by one kind of filtration and adsorption material 23b, the high cleanliness water 16 'squeezed out from the squeeze filter press is collected by the high cleanness water recovery chute 61 and filtered. It can be sent to the filtration adsorbent 23b of the adsorption means 5 for purification. As described above, the high-purity water 16 ′ corresponding to about 80% of the amount of the sediment sludge 15, 15 a is sent to the filter adsorbent 23 b of the filter adsorber 5 for purification. Although all the waste water is returned to the previous process, the processing time can be greatly reduced, and downsizing of all the equipment constituting the purification device can be achieved.
[0034]
Also, since the filtration adsorbent 23b of the filtration adsorbing means 5 is composed of one kind of urethane resin in the form of a sponge and can satisfy the drainage standard and the environmental standard, the conventional two types of filtration adsorbents 51a and 53a are used to perform two steps. In contrast to the separate treatment, the treatment time can be reduced and the size of the equipment relating to the filtration and adsorption means 5 can be reduced.
[0035]
Further, according to the purification method according to the embodiment of the present invention, the sediment sludge 15, 15a settled in the coagulation sedimentation tank 2 is squeezed and dewatered by the squeezing type filter press of the dewatering device 3, and squeezed out. The high-purity water 16 'corresponding to about 80% of the amount of the 15 and 15a is sent to the filtration adsorbent 23b of the filtration / adsorption means 5 in the next step for purification, and the similarly purified low-purity water is removed. Since the wastewater is returned to the muddy water receiving tank 10 in the previous step and is reprocessed, the processing time can be greatly reduced as compared with the related art, and downsizing of all facilities constituting the purification device can be achieved.
[0036]
In the embodiment of the present invention, the hydrophobic substance is described as dioxins. However, the purifying apparatus and the purifying method of the present invention can be applied to hydrophobic substances other than dioxins.
[0037]
【The invention's effect】
As described above, according to the invention of the purification apparatus for purifying contaminated soil described in claim 1, the contaminated soil or the ultra-small particles obtained by classifying the wastewater to a reference diameter or less are flocculated with a flocculant to cause coagulation and sedimentation. A dewatering device for squeezing and dewatering the sediment sludge; and a recovery means for recovering the low-purity water and the high-purity water squeezed out of the dewatering device so as not to come into contact with each other. Without contacting the low-purity water and high-purity water that have been discharged via the recovery means, the low-purity water can be returned to the previous process, and the high-purity water can be sent to the next process. It is possible to greatly reduce the length of the equipment, and to reduce the size of all the equipment constituting the purification device, thereby achieving a reduction in the total cost.
[0038]
According to the invention of the purifying apparatus for purifying contaminated soil described in claim 2, the recovering means comprises a high-purity water recovery chute slidable left and right and a belt conveyor, and these high-cleanliness water recovery A chute and a belt conveyor are vertically arranged below the dehydrator, and immediately below the dehydrator, a high-purity water recovery chute corresponding to high-purity water or low-purity water squeezed from the dehydrator. , Or the belt conveyor, the high-purity water and the low-purity water can be easily collected without contacting each other.
[0039]
According to the invention of the purifying apparatus for purifying contaminated soil described in claim 3, the filtering adsorbent for purifying the high cleanliness water collected by the collecting means absorbs the hydrophobic substance and has a particle size of 1 μm to 5 mm. Because it is composed by laminating granular materials or by using sponge-like resin, it satisfies the drainage standard and the environmental standard with one kind of filter adsorbent, so that the processing time can be greatly reduced compared to the conventional one. In addition, it is possible to reduce the size of equipment relating to the filtration and adsorption means.
[0040]
According to the invention of the purification method for purifying contaminated soil according to claim 4, the contaminated soil or waste water is classified into substandard particles or smaller particles by flocculation with a coagulant to cause coagulation and sedimentation. Separated into high-purity high-purity water, and the separated sediment is squeezed and dewatered, and the squeezed high-purity high-purity water proceeds to the next process. Since the water is returned to the previous step, the treatment time can be significantly reduced as compared with the related art, and the size of all the equipment constituting the purification device can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a purification device for purifying contaminated soil according to an embodiment of the present invention.
FIG. 2 is a front view showing a recovery unit which is a configuration of the purification device for purifying contaminated soil according to the embodiment of the present invention.
FIG. 3 is a side view showing a recovery unit which is a configuration of the purification device for purifying contaminated soil according to the embodiment of the present invention.
FIG. 4 shows a treatment effect of a filtration adsorbent which is a configuration of a purification device for purifying contaminated soil according to an embodiment of the present invention.
FIG. 5 is a schematic view showing a conventional purification device for purifying contaminated soil.
[Explanation of symbols]
3 Dehydration equipment
4 Collection means
5 Filtration and adsorption means
23b Filtration adsorbent
16, 16 'high clean water
61 High cleanliness water recovery chute
62 belt conveyor

Claims (4)

  1. 疎水性物質等の有害物質を含有する汚染土壌、又は排水を浄化する浄化装置において、
    汚染土壌、又は排水を基準径以下に分級した極小径粒子を凝集剤でフロック化して凝集沈殿させ、沈殿した沈殿泥を圧搾脱水する脱水装置と、該脱水装置により絞出された清浄度の高い高清浄度水と該高清浄度水より清浄度の低い低清浄度水とが接触しないようにそれぞれを回収する回収手段とを具備することを特徴とする浄化装置。
    Contaminated soil containing harmful substances such as hydrophobic substances, or purification equipment for purifying wastewater,
    Contaminated soil, or flocculate ultra-small particles obtained by classifying the wastewater to a reference diameter or less with a flocculant, coagulate and sediment, and pressurize and dehydrate the sedimentation sediment, and a high cleanliness squeezed out by the dewatering device A purifying apparatus comprising: a recovering unit that recovers high-cleanliness water and low-cleanliness water having lower cleanliness than the high-cleanliness water so that they do not come into contact with each other.
  2. 前記回収手段は、前記脱水装置から絞出される高清浄度水を回収すると共に水平にスライド可能な高清浄度水回収用シュートと、前記脱水装置から絞出される低清浄度水を回収するベルトコンベアとを具備し、これら高清浄度水回収用シュートとベルトコンベアとは、前記脱水装置の下方に上下に並設され、前記脱水装置から高清浄度水、または低清浄度水のいずれかが絞出される時、前記高清浄度水回収用シュートがスライドすると共に、前記脱水装置の直下には、絞出される高清浄度水、または低清浄度水に対応する前記高清浄度水回収用シュート、またはベルトコンベアのいずれかが配置されることを特徴とする請求項1に記載の浄化装置。The collecting means collects high-purity water squeezed from the dewatering device, and slidably and horizontally slides a high-purity water collecting chute. The chute for collecting high-purity water and the belt conveyor are vertically arranged below the dehydrator, and either the high-purity water or the low-purity water is squeezed from the dehydrator. When discharged, the high-purity water recovery chute slides, and immediately below the dehydrator, the high-purity water recovery chute corresponding to the high-purity water squeezed out or the low-purity water, The purification device according to claim 1, wherein any one of a belt conveyor is arranged.
  3. 前記回収手段で回収した高清浄度水を濾過吸着材を介して浄化させる濾過吸着手段を設け、前記濾過吸着材は、疎水性物質を吸着すると共に、粒径が1μm〜5mmの粒状のものを積層して構成するか、あるいはスポンジ状の樹脂で構成することを特徴とする請求項1または2に記載の浄化装置。A filtration / adsorption unit for purifying the high-purity water collected by the collection unit through a filtration / adsorption material is provided. The filtration / adsorption material adsorbs a hydrophobic substance and has a particle size of 1 μm to 5 mm. The purifying device according to claim 1, wherein the purifying device is formed by laminating or by using a sponge-like resin.
  4. 疎水性物質等の有害物質を含有する汚染土壌、又は排水を浄化する浄化方法において、
    汚染土壌、又は排水を基準径以下に分級した極小径粒子を凝集剤でフロック化して凝集沈殿させて、沈殿した沈殿泥を圧搾脱水して絞出された清浄度の高い高清浄度水と該高清浄度水より清浄度の低い低清浄度水とを接触しないように回収し、回収された高清浄度水を次工程に送ると共に、低清浄度水を前工程に戻すことを特徴とする浄化方法。
    In a purification method for purifying contaminated soil or wastewater containing harmful substances such as hydrophobic substances,
    Contaminated soil, or ultra-small particles obtained by classifying wastewater to a reference diameter or less, are flocculated with a flocculant to cause coagulation and sedimentation. The method is characterized in that low-cleanliness water having a lower degree of cleanliness than that of high-cleanliness water is collected so as not to come into contact, and the collected high-cleanliness water is sent to the next process, and the low-cleanliness water is returned to the previous process. Purification method.
JP2003094664A 2003-03-31 2003-03-31 Purification device to purify contaminated soil Expired - Fee Related JP3766933B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006297266A (en) * 2005-04-20 2006-11-02 Minowa Koki Kk Waste water treatment equipment
JP2007326073A (en) * 2006-06-09 2007-12-20 Penta Ocean Constr Co Ltd Cleaning method for bottom sediment/soil polluted by dioxins
CN102172614A (en) * 2011-01-28 2011-09-07 南京市环境保护科学研究院 Ex-situ washing remediation method for nitrochlorobenzene-contaminated soil
FR3106074A1 (en) * 2020-01-10 2021-07-16 Brezillon Soil remediation

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006297266A (en) * 2005-04-20 2006-11-02 Minowa Koki Kk Waste water treatment equipment
JP4599481B2 (en) * 2005-04-20 2010-12-15 ミノワ工機株式会社 Wastewater treatment equipment
JP2007326073A (en) * 2006-06-09 2007-12-20 Penta Ocean Constr Co Ltd Cleaning method for bottom sediment/soil polluted by dioxins
CN102172614A (en) * 2011-01-28 2011-09-07 南京市环境保护科学研究院 Ex-situ washing remediation method for nitrochlorobenzene-contaminated soil
FR3106074A1 (en) * 2020-01-10 2021-07-16 Brezillon Soil remediation

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