JP4461519B2 - Drilling mud treatment method and apparatus - Google Patents

Drilling mud treatment method and apparatus Download PDF

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Publication number
JP4461519B2
JP4461519B2 JP24176499A JP24176499A JP4461519B2 JP 4461519 B2 JP4461519 B2 JP 4461519B2 JP 24176499 A JP24176499 A JP 24176499A JP 24176499 A JP24176499 A JP 24176499A JP 4461519 B2 JP4461519 B2 JP 4461519B2
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water
separated
sand
silt
mud
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JP2001065281A (en
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利 大月
日出雄 小林
龍太 小野
哲也 吉田
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IHI Corp
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IHI Corp
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  • Treatment Of Sludge (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は建設工事(シールド、トンネル)現場や石油採掘工事(陸上、海底)現場等から排出される土砂を含む掘削泥水を処理するための掘削泥水処理方法及び装置に関するものである。
【0002】
【従来の技術】
たとえば、石油採掘工事現場では、掘削個所の崩壊を防止し且つ掘りくずを円滑に輸送するために、現場の地質に合わせて比重や粘性、化学組成を調整してなる特殊な液体としての粘稠な泥水が掘削時に用いられる。又、掘削に供した後の掘削泥水は土砂を含むのでそのまま放流することはできない。したがって、掘削泥水は何らかの処理を施す必要がある。
【0003】
従来における掘削泥水処理方法の一つとしては、重力沈殿設備、篩、液体サイクロン、凝集沈殿設備、脱水機、砂濾過設備等を用いて、掘削泥水中の固形物をトラック運搬できるまでに脱水し、廃水は、法の基準により処理して下水道又は公共水域に放流するようにし、一方、固形物は、産廃業者経由で埋め立て処分するようにしている。
【0004】
しかし、上記方法の場合、固形物の埋め立て、廃水の放流を目的とした処理であって、再利用を目的としていないので、地球環境保護の立場から法規制が厳しくなりつつあり、又、埋め立て地も限られてきていることもあり、やがては行き詰まるものと予測される。
【0005】
又、従来における掘削泥水処理方法の他の例としては、上記と同様な処理方法の過程に、蒸発濃縮法を採用したものもある。これは、大きめの固形分が分離除去された後の掘削泥水を、蒸発濃縮装置に送り、ここで、循環できなくなる直前まで濃縮した後、連続固化装置へ送って固化剤と共に混練して排出させるようにしたものである。
【0006】
しかし、泥水中には、ベントナイトやCMC(カルボキシメチルセルロース)、その他分散用、粘性付加用の各種薬剤が含まれ、これらの成分が掘削に伴って混入するシルトと一緒になっているため、これを蒸発濃縮により乾燥させると、熱交換器や容器の壁に付着固化して除去できなくなってしまう。
【0007】
一方、近年の海底掘削では、泥水を掘削装置を通して掘削孔に送り込むことにより安定した掘削を行い、掘削に供した後の掘削泥水を船上に回収して、土砂を除去してから再使用するようにした泥水循環系を有する掘削泥水処理装置が用いられることがある。
【0008】
その一例の概要を図3に示すと、船上において、先ず、泥水調整槽1にて、薬剤2と清水3とから泥水4を作って泥水循環槽5へ送り、海底を掘削するときに、泥水4を掘削装置6のドリルパイプを通して掘削孔に送り込み、掘削に供した後の土砂を含む掘削泥水7をライザーパイプを通して船上に回収させ、振動篩及び液体サイクロンからなる分離機8で掘削泥水7に含まれる土砂中のずり9aと砂分9bを分離させてから比重調整槽10へ入れ、該比重調整槽10で泥水循環使用の可否を判断し、一部を泥水4として泥水循環槽5へ戻し、新鮮泥水4を追加して循環使用するようにしている。
【0009】
【発明が解決しようとする課題】
ところが、上記泥水循環方式の場合、分離機8にて掘削泥水7中から分離除去したずり9aや砂分9bは再利用するようにはしておらず、又、分離機8にてずり9aや砂分9bを分離除去した後の掘削泥水7を比重調整槽10へ送って処理し、泥水4として再使用するようにしているが、ずり9aや砂分9bを分離除去しても、掘削泥水7中にはシルトや粘土が分離されずに残っているので、これが比重調整槽10を含む循環ライン中に次第に蓄積されてくることになり、上述したように、一部を引き抜いて新鮮泥水4を追加する操作を行っているものの、結局は廃棄せざるを得なくなってしまう。
【0010】
そこで、本発明は、掘削泥水中から分離されたずり、砂分や比重調整槽から排出された廃棄泥水等を処理して、できるだけ資源化再利用し、以てゼロディスチャージ(環境負荷低減)を図ることができるような掘削泥水処理方法及び装置を提供しようとするものである。
【0011】
【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に、掘削装置による掘削個所に成分調整された泥水を送り、掘削に供した後に回収された土砂を含む掘削泥水を、分離機によりずり及び砂分を分離除去してから比重調整槽へ導いて泥水として循環させて使用するようにしてある掘削泥水処理方法及び装置において、上記掘削泥水から分離させたずり及び砂分を、洗浄用水により洗浄してから貯留させるようにし、ずり及び砂分を洗浄して固形分を分離除去した後の廃水を比重調整槽からの廃棄泥水に合流させ、該合流させた廃水及び廃棄泥水中のシルト分及び粘土分を粗分離した後、精密分離して清澄な処理水を得るようにする掘削泥水処理方法及び装置とする。
【0012】
ずり及び砂分は洗浄により商品価値が高められ、コンクリートの骨材として利用することができるようになる。又、ずり及び砂分を洗浄して固形分を分離除去した後の廃水を比重調整槽からの廃棄泥水に合流させ、該合流させた廃水及び廃棄泥水中のシルト分及び粘土分を分離させるようにしてあるので、洗浄廃水を清澄な水に処理することができ、得られた処理水は各種作業用水として用いることができるようになる。
【0013】
、ずり及び砂分を分離除去した後の掘削泥水中から油分を回収して焼却処理するようにすることにより、比重調整槽へ送る掘削泥水を、油分の含まないものとすることができる。
【0016】
に、遠心分離後の分離液中から膜分離装置でシルト分及び粘土分を精密分離した後の濾液の処理水の水質を検査する水質検査装置を備えることにより、廃水及び廃棄泥水中のシルト分及び粘土分を粗分離した後に精密分離して得られる清澄な処理水を作業用水又は洗浄用水として用いたり、あるいは、放流させたりすることができるようになる。
【0017】
一方、廃水及び廃棄泥水中から粗分離及び精密分離させたシルト分及び粘土分を含む濃縮液を熱風の気流に噴霧して接触させて水分を瞬間的に蒸発させ、該濃縮液中のシルト分及び粘土分を固形物として回収して貯留させるようにすると、シルト分及び粘土分を気流に乗せて固形物(粉末)として回収できる。
【0018】
又、粗分離及び精密分離されたシルト分及び粘土分を含む濃縮液の乾燥時に、肥効成分及び造粒助剤を添加させるようにすることにより、シルト分を園芸用土として回収することができる。
【0019】
更に、粗分離及び精密分離されたシルト分及び粘土分を含む濃縮液を乾燥させるときに発生した水蒸気を凝縮させて回収させるようにすることによって、回収した凝縮水を清水として利用できるようになる。
【0020】
【発明の実施の形態】
図1は本発明の掘削泥水処理装置の実施の一形態を示すもので、図3に示したと同様な泥水循環系を有する掘削泥水処理装置において、分離機8にて掘削泥水7中から分離させたずり(粒径:2mm以上)9aや砂分(粒径:0.074〜2mm)9b等を再利用できるようにすると共に、比重調整槽10から廃棄された廃棄泥水11を再利用できるようにする。
【0021】
詳述すると、分離機8にて掘削泥水7中から分離させて取り出したずり9aと砂分9bに対してそれぞれ洗浄用水12を圧力噴霧して洗浄するようにした洗浄装置としてのずり洗浄コンベア13と砂洗浄コンベア14とを設けると共に、両洗浄コンベア13,14で使用した後の洗浄廃水15を受ける洗浄廃水貯留槽16を備え、又、該洗浄廃水貯留槽16からの洗浄廃水15と作業廃水貯留槽17からの作業廃水18との混合廃水中の固形分(主として、シルト、ずり)9eを分離除去するようにした振動篩及び液体サイクロンからなる分離機19を備え、且つ該分離機19にて分離した固形分9eと上記ずり洗浄コンベア13で洗浄した後のずり9aとをセメント20の添加により固化するようにした固化装置21を設け、更に、該固化装置21で固化させた固化物をずりとして貯留するずり貯留コンテナ22を用意し、コンテナ輸送船24にて陸上へ輸送してずり9aを再利用できるようにし、一方、上記砂洗浄コンベア14で洗浄した後の砂分9bを貯留する砂貯留コンテナ23を用意し、同様に、コンテナ輸送船24で陸上へ輸送して砂分9bを再利用できるようにする。
【0022】
又、上記分離機8にてずり9a及び砂分9bを分離した後の掘削泥水7中から油分25を加圧浮上させて回収するための加圧浮上槽26と、回収した油分25を貯留する油分貯留槽27と、貯留した油分25を適当な時期に焼却する焼却炉28とを備え、且つ該焼却炉28で油分25を焼却した後の焼却灰29を貯留する焼却灰貯留コンテナ30を用意し、コンテナ輸送船24で陸上へ輸送できるようにする。
【0023】
更に、比重調整槽10から排出された廃棄泥水11と上記分離機19の廃水31とを処理原液32として受け入れるようにした原液槽33と、該原液槽33に受け入れた後の原液32中からシルト分(粒径:0.05〜0.074mm)9cや粘土分(粒径:0.005mm以下)9dを粗分離させるように原液32を遠心分離させる遠心分離装置としてのスクリューデカンタ34と、該スクリューデカンタ34による分離液35を貯留する分離液貯留槽36と、分離液35中からシルト分9cや粘土分9dを精密分離する膜分離装置37と、該膜分離装置37による濾液38を貯留する濾液貯留槽39と、濾液38の水質検査を行う水質検査装置41とを備え、濾液38を清澄な処理水として、船舶の作業用水や上記洗浄コンベア13,14の洗浄用水12等に再利用できるようにする。
【0024】
一方、上記スクリューデカンタ34と膜分離装置37で分離させたシルト分9c及び粘土分9dを含む濃縮液42を貯留する濃縮液貯留槽43と、該濃縮液貯留槽43に貯留された後の濃縮液42の水分を蒸発させるスプレードライヤー44とを備え、且つ該スプレードライヤー44で濃縮液42を乾燥させたときに発生する水蒸気40を凝縮させる凝縮器57を備え、更に、該スプレードライヤー44で乾燥させて粉末状にしたシルト分9c及び粘土分9dを貯留するシルト貯留コンテナ45を用意し、コンテナ輸送船24にて陸上へ輸送してシルト分9c及び粘土分9dを再利用できるようにする。
【0025】
上記膜分離装置37は、たとえば、多数の中空糸膜製の分離膜に濾過水管を接続した構成としてある。
【0026】
上記スプレードライヤー44は、図2に詳細を示す如く、円筒部46a及び漏斗部46bを上下方向に連設してなる乾燥容器46の頂部付近に、熱風送給管50を容器中心部へ向けて斜め下向きに接続し、送風機51の運転によりエアフィルタ52を通して吸引したエアを熱風発生装置53で加熱して熱風とし、該熱風を熱風フィルタ54を介し上記熱風送給管50を通して乾燥容器46内に供給できるようにし、且つ上記乾燥容器46の頂部中心位置に、ポンプ47付きの液送給管48を接続したアトマイザ又はノズル49を下向きに組み付けて、ポンプ47の駆動により吸引した濃縮液貯留槽43内の濃縮液42を液送給管48を通してアトマイザ又はノズル49から上記熱風の気流中に霧状に噴霧することにより、瞬間的に水分を蒸発させてシルト分9cを固形粗粒子とするようにしてあり、又、固形粗粒子としたシルト分9cを、サイクロン55とバグフィルタ56によって2段階に回収するようにしてあり、更に、上記乾燥容器46内で発生した水蒸気40は冷却して凝縮水として再利用するようにしてある。なお、上記熱風フィルタ54は必要不可欠なものではない。
【0027】
掘削装置6で海底を掘削するときに、掘削孔を固定して行くために、船上で作った泥水4を送り、掘削に供した後の掘削泥水7を回収して振動篩及び流体サイクロンからなる分離機8で、掘削泥水7中に含まれる土砂(ずり9a、砂分9b、シルト分9c、粘土9d等)中のずり9a及び砂分9bを分離させてから比重調整槽10へ入れるようにしてある状態において、本発明では、次の工程を行わせるようにする。
【0028】
すなわち、上記分離機8で取り出したずり9aと砂分9bを洗浄のためにずり洗浄コンベア13と砂洗浄コンベア14へ送り、ここで、それぞれ洗浄用水12を圧力噴霧して付着泥水を除去した後、ずり貯留コンテナ22と砂貯留コンテナ23に貯留させるようにする。この際、洗浄に供した後の洗浄廃水15は、洗浄廃水貯留槽16内に一旦貯留した後、作業廃水貯留槽17内に貯留されている作業廃水(船上作業で用いられたもの)18と共に振動篩及び流体サイクロンからなる分離機19へ送って、固形分9eを取り出すようにする。取り出された固形分9は固化装置21に入れ、上記ずり貯留コンテナ22に貯留されるべきずり9aに混ぜられ、セメント20の添加により固化させるようにする。なお、この固形分9の固化工程は必要不可欠なものではなく、したがって、固化装置21は不要としてもよい。
【0029】
一方、上記分離機8でずり9a及び砂分9bを除去した後の掘削泥水7中に油分25が含まれているような場合には、加圧浮上槽26で油分25を収集して油分貯留槽27に一旦貯留させるようにし、しかる後、油分25を焼却炉28で焼却処分し、焼却灰29を焼却灰貯留コンテナ30に貯留させるようにする。
【0030】
又、比重調整槽10では、分離機8で掘削泥水中のずり9aや砂分9bを分離除去した後に掘削泥水7を処理して、泥水4を泥水循環槽5へ送るが、シルト分9cや粘土分9dは分離できずに掘削泥水中に蓄積してくるので、循環使用に供しないものは廃棄泥水(余剰泥水を含む)11として取り出し、分離機19で廃水15,18の混合水から固形分9eを取り除いた後の廃水31と共に原液槽33へ原液32として導入させるようにする。次に、原液32は、スクリューデカンタ34でシルト分9cや粘土分9dを粗分離させるようにして、分離液35は分離液貯留槽36に一旦貯留させるようにし、更に、分離液35は膜分離装置37でシルト分9cや粘土分9dを精密分離させて、その濾液38を濾液貯留槽39に清澄な処理水として貯留させるようにする。得られた濾液38を放流させるときは、水質検査装置41による検査を経て放流させるようにし、放流させずに上記洗浄コンベア13,14の洗浄用水12として用いる場合は水質検査をすることなく、船上での作業用水として用いるようにする。なお、放流させる場合は、所定の方法により基準値を満足する水質まで処理するようにする。
【0031】
更に、上記スクリューデカンタ34により粗分離され、膜分離装置37により精密分離されたシルト分9cや粘土分9dは濃縮液42として濃縮液貯留槽43に一旦貯留させるようにし、しかる後、この濃縮液42をスプレードライヤー44に送り、シルト分9c及び粘土分9dを固形物として回収させ、シルト貯留コンテナ45に貯留させるようにする。この場合、濃縮液42を通常の蒸発濃縮装置で乾燥させるようにすると、熱交換器や容器の壁に粒子が付着して固化し、最後は除去できなくなってしまうが、本発明では、図2に示す如く、乾燥容器46内に送給した熱風の気流中に濃縮液42を霧状に噴霧して瞬間的に水分を蒸発させるようにするので、大部分の固形粗粒子は容器壁に付着することなく、気流に乗って運ばれてサイクロン55及びバグフィルタ56で回収される。
【0032】
上記において、ずり貯留コンテナ22に貯留されたずり9a、砂貯留コンテナ23に貯留された砂分9b、シルト貯留コンテナ45に貯留されたシルト分9c、焼却灰貯留コンテナ30に貯留された焼却灰29は、コンテナ輸送船24により陸上まで輸送された後、再利用又は処分される。
【0033】
上記ずり9aや砂分9bは、コンクリートの骨材や路盤改良材等に再利用できる。又、シルト分9cは、スプレードライヤー44での乾燥時に肥効成分(NやP)と造粒助剤を加えることにより造粒(1〜2mmφ)させて排出させ、園芸用土として再利用できるし、セメント製造時の原料用粘土やセラミックスタイルの原料としても使用可能である。
【0034】
一方、膜分離装置37で得られた濾液38は固形物を含まない清澄な処理水であるため、船上等での作業用水やずり、砂の洗浄用水として再利用することができる。この際、濾液38には溶解性成分(色素や塩素イオン等)が含まれているが、再利用の用途に合わせて必要な高度処理を付加することができる。又、スプレードライヤー44で発生した水蒸気40は凝縮器57で凝縮させて清水として回収し、これは飲料水として用いるようにしたり、上記作業用水や洗浄用水の補給用として再利用できる。
【0035】
なお、上記実施の形態では、海底掘削により生じた掘削泥水の処理について示したが、他の掘削工事により生じた掘削泥水の処理についても同様に採用し得ること、その他本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。
【0036】
【発明の効果】
以上述べた如く、本発明の掘削泥水処理方法及び装置によれば、次の如き優れた効果を発揮する。
(1)掘削装置による掘削個所に成分調整された泥水を送り、掘削に供した後に回収された土砂を含む掘削泥水を、分離機によりずり及び砂分を分離除去してから比重調整槽へ導いて泥水として循環させて使用するようにしてある掘削泥水処理方法及び装置において、上記掘削泥水から分離させたずり及び砂分を、洗浄用水により洗浄してから貯留させるようにし、ずり及び砂分を洗浄して固形分を分離除去した後の廃水を比重調整槽からの廃棄泥水に合流させ、該合流させた廃水及び廃棄泥水中のシルト分及び粘土分を粗分離した後、精密分離して清澄な処理水を得るようにしてあるので、洗浄によりずり及び砂分の商品価値を高めることができ、貯留させたずり及び砂分を、コンクリートの骨材や路盤改良材等に再利用資源化することができる。又、ずり及び砂分を洗浄して固形分を分離除去した後の廃水を比重調整槽からの廃棄泥水に合流させてシルト分及び粘土分を分離させるようにすることにより、多くの廃水を効率的に清澄処理することができ、得られた処理水は各種作業用水として再利用することができる。
(2)ずり及び砂分を分離除去した後の掘削泥水中から油分を回収して焼却処理するようにしてあるので、油分を含まない掘削泥水を比重調整槽へ送ることができる。
(3)遠心分離後の分離液中から膜分離装置でシルト分及び粘土分を精密分離した後の濾液の処理水の水質を検査する水質検査装置を備えることにより、廃水及び廃棄泥水中のシルト分及び粘土分を粗分離した後に精密分離して得られる清澄な処理水を作業用水又は洗浄用水として用いたり、あるいは、放流させたりすることができ、任意に処理することができる。
(4)廃水及び廃棄泥水中から粗分離及び精密分離させたシルト分及び粘土分を含む濃縮液を熱風の気流に噴霧して接触させて水分を瞬間的に蒸発させ、該濃縮液中のシルト分及び粘土分を固形物として回収して貯留させるようにすることによって、シルト分及び粘土分を固形物として気流に乗せて回収することができ、回収したシルト分及び粘土分は、セメント製造時の原料やセラミックスタイルの原料として使用することができる。
(5)粗分離及び精密分離されたシルト分及び粘土分を含む濃縮液の乾燥時に、肥効成分及び造粒助剤を添加させるようにすることにより、回収したシルト分を園芸用土として再利用することができる。
(6)粗分離及び精密分離されたシルト分及び粘土分を含む濃縮液を乾燥させるときに発生した水蒸気を凝縮させて回収させるようにすることにより、回収した凝縮水を清水として利用することができる。
(7)以上各項により、ゼロディスチャージを図ることができる。
【図面の簡単な説明】
【図1】本発明の掘削泥水処理装置の実施の一形態を示す系統図である。
【図2】本発明の掘削泥水処理装置で用いるスプレードライヤーの詳細図である。
【図3】泥水循環系を有する掘削泥水処理装置の一例を示す概要図である。
【符号の説明】
4 泥水
6 掘削装置
7 掘削泥水
8 分離機
9a ずり
9b 砂分
9c シルト分
9d 粘土分
9e 固形分
10 比重調整槽
11 廃棄泥水
12 洗浄用水
13 ずり洗浄コンベア(洗浄装置)
14 砂洗浄コンベア(洗浄装置)
15 洗浄廃水
22 ずり貯留コンテナ
23 砂貯留コンテナ
25 油分
26 加圧浮上槽
28 焼却炉
29 焼却灰
30 焼却灰貯留コンテナ
31 廃水
32 原液
33 原液槽
34 スクリューデカンタ(遠心分離機)
35 分離液
37 膜分離装置
38 濾液
40 水蒸気
41 水質検査装置
42 濃縮液
44 スプレードライヤー
45 シルト貯留コンテナ
57 凝縮器
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drilling mud treatment method and apparatus for treating drilling mud containing earth and sand discharged from a construction work (shield, tunnel) site, an oil mining work (land, seabed) site, and the like.
[0002]
[Prior art]
For example, at oil drilling construction sites, in order to prevent the collapse of drilling sites and to transport digging scraps smoothly, the viscosity as a special liquid is adjusted by adjusting the specific gravity, viscosity, and chemical composition according to the geology of the site. Mud is used during excavation. Moreover, since the drilling mud after being subjected to excavation contains earth and sand, it cannot be discharged as it is. Therefore, the drilling mud needs to be treated in some way.
[0003]
One conventional drilling mud treatment method is to dewater solid matter in the drilling mud until it can be transported by truck, using gravity sedimentation equipment, sieve, hydrocyclone, coagulation sedimentation equipment, dehydrator, sand filtration equipment, etc. Wastewater is treated according to legal standards and discharged into sewers or public waters, while solids are disposed of in landfills via industrial waste disposal companies.
[0004]
However, in the case of the above method, the treatment is aimed at the reclamation of solid materials and the discharge of wastewater, and not for the purpose of reuse, so the laws and regulations are becoming stricter from the standpoint of protecting the global environment. However, it is expected that it will eventually get stuck.
[0005]
In addition, as another example of the conventional drilling mud treatment method, there is one in which an evaporation concentration method is employed in the process of the same treatment method as described above. This is because the drilling mud after separation and removal of large solids is sent to the evaporative concentrator, where it is concentrated until just before it can no longer be circulated, then sent to the continuous solidifier and kneaded with the solidifying agent and discharged. It is what I did.
[0006]
However, the muddy water contains bentonite, CMC (carboxymethylcellulose), various other agents for dispersion and viscosity addition, and these components are combined with silt mixed with excavation. If it is dried by evaporation and concentration, it adheres to and solidifies on the wall of the heat exchanger or container and cannot be removed.
[0007]
On the other hand, in recent seabed excavation, mud is sent to a drilling hole through a drilling device, and stable excavation is performed. The excavated mud collected on the excavation is collected on the ship, and the earth and sand are removed before reuse. A drilling mud treatment apparatus having a mud circulation system is sometimes used.
[0008]
The outline of the example is shown in FIG. 3. First, on the ship, mud water 4 is made from the chemical 2 and the fresh water 3 in the mud adjustment tank 1 and sent to the mud circulation tank 5. 4 is sent to the drilling hole through the drill pipe of the drilling device 6 and the drilling mud 7 including the earth and sand after being used for drilling is collected on the ship through the riser pipe, and the drilling mud 7 is separated by the separator 8 composed of a vibrating sieve and a hydrocyclone. After the shear 9a and the sand content 9b contained in the earth and sand are separated, they are put into the specific gravity adjusting tank 10 and judged whether or not the mud circulation can be used in the specific gravity adjusting tank 10, and a part thereof is returned to the mud circulating tank 5 as the mud 4 In addition, fresh mud water 4 is added for circulation.
[0009]
[Problems to be solved by the invention]
However, in the case of the above mud circulation system, the separator 9a and the sand 9b separated and removed from the drilling mud 7 by the separator 8 are not reused. The excavated mud 7 after separating and removing the sand 9b is sent to the specific gravity adjusting tank 10 to be processed and reused as the mud 4. However, the excavated mud is not removed even if the shear 9a and the sand 9b are separated and removed. 7, silt and clay remain unseparated, and this gradually accumulates in the circulation line including the specific gravity adjusting tank 10. The operation to add is performed, but eventually it must be discarded.
[0010]
Therefore, the present invention treats the sheared mud separated from the drilling mud, sand and waste mud discharged from the specific gravity adjustment tank, and reuses them as much as possible, thereby reducing zero discharge (reducing environmental impact). It is an object of the present invention to provide a drilling mud treatment method and apparatus that can be realized.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention sends the muddy water whose components are adjusted to the excavation site by the excavator and separates the excavated mud containing the earth and sand collected after being excavated by using a separator. In the drilling mud treatment method and apparatus which are used after being removed and guided to the specific gravity adjustment tank and circulated as mud, the scrap and sand separated from the drilling mud are washed with washing water and stored. The waste water after washing and removing the solid content by separating the sludge and sand is joined to the waste mud from the specific gravity adjustment tank, and the silt and clay in the joined waste water and waste mud are coarsened. After the separation, a drilling mud treatment method and apparatus are provided for precise separation to obtain clear treated water.
[0012]
The shear and sand content is increased in commercial value by washing, and can be used as concrete aggregate. In addition, the waste water after washing and removing the solid content by washing the shear and sand is joined to the waste mud from the specific gravity adjusting tank, and the silt and clay content in the joined waste water and waste mud are separated. Therefore, the cleaning waste water can be treated into clear water, and the obtained treated water can be used as various working water.
[0013]
Also, not a Ri and by so that incineration to recover the oil sand fraction from drilling in mud after separation and removal, the drilling mud to be sent to a specific gravity adjusting tank, can be made free of oil .
[0016]
Further, by providing the water quality testing apparatus for testing the quality of the filtrate of the treated water after precision separated silt and clay content in the membrane separator from the separation liquid after centrifugation, silt wastewater and waste in mud The clear treated water obtained by fine separation after roughly separating the clay and clay components can be used as working water or washing water, or can be discharged.
[0017]
On the other hand, a concentrated solution containing silt and clay components roughly separated and precisely separated from waste water and waste mud water is sprayed and contacted with a hot air stream to instantaneously evaporate water, and the silt in the concentrated solution If a part and clay part are collect | recovered and stored as a solid substance, a silt part and a clay part can be put on airflow, and can be collect | recovered as a solid substance (powder).
[0018]
Moreover, the silt content can be recovered as horticultural soil by adding a fertilizing component and a granulating aid during drying of the concentrate containing the silt and clay components that have been separated roughly and precisely. .
[0019]
Furthermore, by condensing and recovering the water vapor generated when drying the concentrate containing the silt and clay components that have been roughly and precisely separated , the recovered condensed water can be used as fresh water. .
[0020]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of a drilling mud treatment apparatus according to the present invention. In a drilling mud treatment apparatus having a mud circulation system similar to that shown in FIG. It is possible to reuse the sludge (particle size: 2 mm or more) 9a, sand (particle size: 0.074-2 mm) 9b, etc., and to reuse the waste mud water 11 discarded from the specific gravity adjustment tank 10 To.
[0021]
More specifically, a shear cleaning conveyor 13 as a cleaning device is configured to perform cleaning by spraying the cleaning water 12 on each of the slurry 9a and the sand 9b separated from the drilling mud 7 by the separator 8 and washed. And a cleaning waste water storage tank 16 for receiving the cleaning waste water 15 after being used in both the cleaning conveyors 13, 14, and the cleaning waste water 15 and the working waste water from the cleaning waste water storage tank 16. A separator 19 composed of a vibrating sieve and a liquid cyclone that separates and removes solids (mainly silt and shear) 9e in the wastewater mixed with the working wastewater 18 from the storage tank 17 is provided. A solidifying device 21 for solidifying the separated solid content 9e and the sheared 9a after being washed by the above-described shear washing conveyor 13 by adding cement 20; A shear storage container 22 for storing the solidified material solidified in the device 21 as a shear is prepared and transported to the land by a container transport ship 24 so that the shear 9a can be reused, while being washed by the sand washing conveyor 14 Then, a sand storage container 23 for storing the sand content 9b is prepared, and similarly, the sand content 9b can be reused by being transported to the land by the container transport ship 24.
[0022]
In addition, a pressure levitation tank 26 for collecting and recovering the oil 25 from the drilling mud 7 after separating the shear 9a and the sand 9b by the separator 8 and the recovered oil 25 are stored. An incineration ash storage container 30 that includes an oil storage tank 27 and an incinerator 28 that incinerates the stored oil 25 at an appropriate time, and that stores incineration ash 29 after incineration of the oil 25 in the incinerator 28 is prepared. Then, the container transport ship 24 can be transported to the ground.
[0023]
Furthermore, the waste muddy water 11 discharged from the specific gravity adjusting tank 10 and the waste water 31 of the separator 19 are received as a processing stock solution 32, and the silt from the stock solution 32 after being received in the stock solution tank 33. A screw decanter 34 as a centrifuge for centrifuging the undiluted solution 32 so as to roughly separate a portion (particle size: 0.05 to 0.074 mm) 9c and a clay portion (particle size: 0.005 mm or less) 9d; A separation liquid storage tank 36 for storing a separation liquid 35 by a screw decanter 34, a membrane separation apparatus 37 for precisely separating a silt component 9c and a clay component 9d from the separation liquid 35, and a filtrate 38 by the membrane separation apparatus 37 are stored. A filtrate storage tank 39 and a water quality inspection device 41 for inspecting the water quality of the filtrate 38 are provided. The filtrate 38 is used as a clear treated water, and the working water of the ship and the washing conveyors 13 and 14 are washed. It can be reused for clean water 12 or the like.
[0024]
On the other hand, a concentrated liquid storage tank 43 that stores the concentrated liquid 42 containing the silt component 9c and the clay component 9d separated by the screw decanter 34 and the membrane separator 37, and the concentration after being stored in the concentrated liquid storage tank 43. A spray dryer 44 for evaporating the water in the liquid 42, a condenser 57 for condensing the water vapor 40 generated when the concentrated liquid 42 is dried by the spray dryer 44, and drying by the spray dryer 44. The silt storage container 45 for storing the silt portion 9c and the clay portion 9d, which are powdered, is prepared and transported to the land by the container transport ship 24 so that the silt portion 9c and the clay portion 9d can be reused.
[0025]
The membrane separation device 37 has, for example, a configuration in which a filtration water pipe is connected to a number of separation membranes made of hollow fiber membranes.
[0026]
As shown in detail in FIG. 2, the spray dryer 44 has a hot air supply pipe 50 directed toward the center of the container near the top of the drying container 46 in which a cylindrical portion 46a and a funnel portion 46b are connected in the vertical direction. The air drawn through the air filter 52 by the operation of the blower 51 is heated by the hot air generator 53 to be hot air, and the hot air is passed through the hot air supply pipe 50 through the hot air feed pipe 50 into the drying container 46. A concentrated liquid storage tank 43 that can be supplied and is attached to the central position of the top of the drying container 46 with an atomizer or nozzle 49 connected to a liquid feed pipe 48 with a pump 47 downward and sucked by driving the pump 47. Moisture is instantaneously evaporated by spraying the concentrated liquid 42 in the form of mist from the atomizer or nozzle 49 through the liquid supply pipe 48 into the hot air stream. The silt content 9c is made into solid coarse particles, and the silt content 9c made into solid coarse particles is recovered in two stages by the cyclone 55 and the bag filter 56, and the drying container The water vapor 40 generated in 46 is cooled and reused as condensed water. The hot air filter 54 is not indispensable.
[0027]
When excavating the sea floor with the excavator 6, in order to fix the excavation hole, the mud 4 made on the ship is sent, and the excavated mud 7 after being used for excavation is collected and consists of a vibrating sieve and a fluid cyclone. The separator 8 separates the shear 9a and the sand 9b in the earth and sand (shear 9a, sand 9b, silt 9c, clay 9d, etc.) contained in the drilling mud 7 and then puts them into the specific gravity adjustment tank 10. In a certain state, the present invention causes the following steps to be performed.
[0028]
That is, after the scrap 9a and the sand 9b taken out by the separator 8 are sent to the shear washing conveyor 13 and the sand washing conveyor 14 for washing, the washing water 12 is sprayed with pressure to remove the adhering muddy water, respectively. Then, the shear storage container 22 and the sand storage container 23 are stored. At this time, the cleaning waste water 15 after being used for cleaning is once stored in the cleaning waste water storage tank 16 and then the work waste water (used in the ship work) 18 stored in the work waste water storage tank 17. It sends to the separator 19 which consists of a vibration sieve and a fluid cyclone, and solid content 9e is taken out. The taken-out solid content 9 e is put into the solidification device 21, mixed with the shear 9 a to be stored in the shear storage container 22, and solidified by adding cement 20. Incidentally, solidifying step of this solid 9 e is not essential, therefore, solidifying device 21 may be unnecessary.
[0029]
On the other hand, when the oil 25 is contained in the drilling mud 7 after the shear 9a and the sand 9b are removed by the separator 8, the oil 25 is collected by the pressurized levitation tank 26 and stored. The tank 27 is temporarily stored, and then the oil 25 is incinerated in the incinerator 28 and the incinerated ash 29 is stored in the incinerated ash storage container 30.
[0030]
Further, the specific gravity adjusting tank 10, and process the drilling mud 7 shear 9a and sand fraction 9b in drilling mud 7 in the separator 8 after the separation and removal, but sends the muddy water 4 to mud circulation tank 5, silt 9c Since the clay component 9d cannot be separated and accumulates in the drilling mud 7 , it is taken out as waste mud (including surplus mud) 11 which is not used for circulation, and is mixed with waste water 15 and 18 by the separator 19 It is made to introduce into stock solution tank 33 as stock solution 32 with waste water 31 after removing solid content 9e from. Next, the stock solution 32 is obtained by roughly separating the silt component 9c and the clay component 9d by the screw decanter 34, the separation solution 35 is temporarily stored in the separation solution storage tank 36, and the separation solution 35 is further separated by membrane separation. The apparatus 37 precisely separates the silt component 9c and the clay component 9d, and the filtrate 38 is stored in the filtrate storage tank 39 as clear treated water. When the obtained filtrate 38 is discharged, it is discharged after the inspection by the water quality inspection device 41, and when it is used as the washing water 12 of the washing conveyors 13 and 14 without being discharged, the water quality inspection is not carried out on the ship. Use as working water in In addition, when making it discharge, it is made to process to the water quality which satisfies a reference value by a predetermined method.
[0031]
Further, the silt component 9c and the clay component 9d, which are roughly separated by the screw decanter 34 and precisely separated by the membrane separator 37, are temporarily stored in the concentrate storage tank 43 as the concentrate 42, and then the concentrate 42 is sent to the spray dryer 44, and the silt component 9c and the clay component 9d are collected as solids and stored in the silt storage container 45. In this case, if the concentrated liquid 42 is dried by a normal evaporative concentration apparatus, particles adhere to the heat exchanger or the wall of the container and solidify, and finally cannot be removed. As shown in FIG. 4, the concentrated liquid 42 is sprayed in the form of a mist in the hot air stream fed into the drying container 46 so as to evaporate the water instantly, so that most of the solid coarse particles adhere to the container wall. Without being carried, it is carried by the air current and collected by the cyclone 55 and the bag filter 56.
[0032]
In the above, the shear 9 a stored in the shear storage container 22, the sand 9 b stored in the sand storage container 23, the silt 9 c stored in the silt storage container 45, and the incineration ash 29 stored in the incineration ash storage container 30. After being transported to the land by the container transport ship 24, they are reused or disposed of.
[0033]
The above-mentioned shear 9a and sand content 9b can be reused for concrete aggregate, roadbed improvement material and the like. In addition, the silt content 9c can be granulated (1-2 mmφ) by adding a fertilizer component (N or P) and a granulating aid during drying with the spray dryer 44, and can be reused as horticultural soil. It can also be used as a raw material clay or ceramic style raw material for cement production.
[0034]
On the other hand, the filtrate 38 obtained by the membrane separation device 37 is a clear treated water that does not contain solid matter, and therefore can be reused as water for working on a ship or the like, or as water for washing sand. At this time, the filtrate 38 contains soluble components (pigment, chlorine ions, etc.), but it is possible to add advanced treatments necessary for the purpose of reuse. Further, the water vapor 40 generated by the spray dryer 44 is condensed by a condenser 57 and recovered as fresh water, which can be used as drinking water, or can be reused for replenishing the working water and washing water.
[0035]
In addition, in the said embodiment, although it showed about the process of the drilling mud produced by the seabed excavation, it can employ | adopt similarly about the process of the drilling mud produced by other drilling construction, and does not deviate from the summary of this invention. Of course, various changes can be made within the range.
[0036]
【The invention's effect】
As described above, according to the drilling mud treatment method and apparatus of the present invention, the following excellent effects are exhibited.
(1) The component-adjusted muddy water is sent to the excavation site by the excavator, and the excavated muddy water containing the earth and sand collected after excavation is guided to the specific gravity adjustment tank after the shear and sand are separated and removed by the separator. In the drilling mud treatment method and apparatus designed to be circulated and used as mud, the shear and sand separated from the drilling mud are washed with washing water and stored, and the shear and sand are removed. The waste water after washing and separating and removing the solid content is joined to the waste mud from the specific gravity adjustment tank, and the combined waste water and the silt and clay content in the waste mud are roughly separated, followed by precise separation and clarification. Since the treated water is obtained, the commercial value of the shear and sand can be increased by washing, and the stored shear and sand can be reused as concrete aggregate and roadbed improvement materials. Can Kill. In addition, waste water after washing and removing solids from sand and sand is merged with waste mud from the specific gravity adjustment tank to separate silt and clay, thereby increasing the efficiency of waste water. Clarification treatment can be performed, and the obtained treated water can be reused as various working water.
(2) Since oil is collected from the drilling mud after separating and removing the shear and sand, and incinerated, the drilling mud containing no oil can be sent to the specific gravity adjustment tank.
(3) Silt in waste water and waste mud water by providing a water quality inspection device that inspects the quality of the treated water of the filtrate after separating the silt content and clay content from the separated liquid after centrifugation with a membrane separator. The clear treated water obtained by fine separation after roughly separating the clay and clay components can be used as working water or washing water, or can be discharged, and can be treated arbitrarily.
(4) A concentrated solution containing silt and clay components roughly separated and precisely separated from waste water and waste mud is sprayed and contacted with a hot air stream to instantaneously evaporate water, By collecting and storing the silt and clay as solids, the silt and clay can be recovered by placing them in an air stream as solids. It can be used as a raw material for time or ceramic style.
(5) Recycle the recovered silt as horticultural soil by adding fertilizers and granulation aids when drying the concentrate containing the silt and clay components separated roughly and precisely. can do.
(6) The recovered condensed water can be used as fresh water by condensing and recovering the water vapor generated when drying the concentrate containing the silt and clay components separated roughly and precisely. it can.
(7) With the above items, zero discharge can be achieved.
[Brief description of the drawings]
FIG. 1 is a system diagram showing an embodiment of a drilling mud treatment apparatus of the present invention.
FIG. 2 is a detailed view of a spray dryer used in the drilling mud treatment apparatus of the present invention.
FIG. 3 is a schematic diagram showing an example of a drilling mud treatment apparatus having a mud circulation system.
[Explanation of symbols]
4 Mud 6 Drilling equipment 7 Drilling mud 8 Separator 9a Slip 9b Sand 9c Silt 9d Clay
9e Solid content 10 Specific gravity adjustment tank 11 Waste muddy water 12 Washing water 13 Shear washing conveyor (washing device)
14 Sand cleaning conveyor (cleaning equipment)
DESCRIPTION OF SYMBOLS 15 Washing waste water 22 Shear storage container 23 Sand storage container 25 Oil content 26 Pressure floatation tank 28 Incinerator 29 Incineration ash 30 Incineration ash storage container
31 Wastewater 32 Stock solution 33 Stock solution tank 34 Screw decanter (centrifugal separator)
35 Separation liquid 37 Membrane separation apparatus 38 Filtrate 40 Water vapor 41 Water quality inspection apparatus 42 Concentrated liquid 44 Spray dryer 45 Silt storage container 57 Condenser

Claims (11)

掘削装置による掘削個所に成分調整された泥水を送り、掘削に供した後に回収された土砂を含む掘削泥水を、分離機によりずり及び砂分を分離除去してから比重調整槽へ導いて泥水として循環させて使用するようにしてある掘削泥水処理方法において、上記掘削泥水から分離させたずり及び砂分を、洗浄用水により洗浄してから貯留させるようにし、ずり及び砂分を洗浄して固形分を分離除去した後の廃水を比重調整槽からの廃棄泥水に合流させ、該合流させた廃水及び廃棄泥水中のシルト分及び粘土分を粗分離した後、精密分離して清澄な処理水を得るようにすることを特徴とする掘削泥水処理方法。The muddy water whose components are adjusted is sent to the excavation site by the excavator, and the excavated mud containing the earth and sand collected after excavation is separated and removed by the separator, and then guided to the specific gravity adjustment tank as muddy water. In the drilling mud treatment method that is intended to be circulated, the scrap and sand separated from the drilling mud are washed with water for washing and then stored, and the shear and sand are washed to obtain a solid content. The waste water after separation and removal is joined to the waste mud from the specific gravity adjustment tank, and after the silt and clay content in the joined waste water and waste mud are roughly separated, fine separation is performed to obtain clear treated water. A drilling mud treatment method, characterized in that: 掘削装置による掘削個所に成分調整された泥水を送り、掘削に供した後に回収された土砂を含む掘削泥水を、分離機によりずり及び砂分を分離除去してから比重調整槽へ導いて泥水として循環させて使用するようにしてある掘削泥水処理方法において、上記掘削泥水から分離させたずり及び砂分を、洗浄用水により洗浄してから貯留させるようにし、次いで、ずり及び砂分を分離除去した後の掘削泥水中から油分を回収して焼却処理するようにし、ずり及び砂分を洗浄して固形分を分離除去した後の廃水を比重調整槽からの廃棄泥水に合流させて、該合流させた廃水及び廃棄泥水中のシルト分及び粘土分を粗分離した後、精密分離して清澄な処理水を得るようにすることを特徴とする掘削泥水処理方法。The muddy water whose components are adjusted is sent to the excavation site by the excavator, and the excavated mud containing the earth and sand collected after excavation is separated and removed by the separator, and then guided to the specific gravity adjustment tank as muddy water. In the drilling mud treatment method that is intended to be circulated, the scrap and sand separated from the drilling mud are washed with washing water and stored, and then the shear and sand are separated and removed. from drilling in mud and recovered oil so as to incineration after, the waste water after separating and removing solids washed shear and sand content by merging the waste mud from gravity adjusting tank, the merging A drilling mud treatment method, characterized in that after the silt and clay components in the waste water and waste mud are roughly separated, they are precisely separated to obtain a clear treated water. 廃水及び廃棄泥水中のシルト分及び粘土分を粗分離した後に精密分離して得られる清澄な処理水を、作業用水又は洗浄用水として用いるか、あるいは、放流させるようにする請求項1又は2記載の掘削泥水処理方法。Clear treated water obtained by precisely separated was coarsely separated silt and clay content of waste water and waste in mud, or used as a working water or wash water, or, according to claim 1 or 2, so as to discharge Drilling mud treatment method. 廃水及び廃棄泥水中から粗分離及び精密分離させたシルト分及び粘土分を含む濃縮液を熱風の気流に噴霧して接触させて水分を瞬間的に蒸発させ、該濃縮液中のシルト分及び粘土分を固形物として回収して貯留させるようにする請求項1又は2記載の掘削泥水処理方法。The concentrate containing silt and clay fractions were rough separation and fine separation from the waste water and waste in mud is contacted by spraying the air flow heated air is instantaneously evaporate the water, silt and the concentrated solution The drilling mud treatment method according to claim 1 or 2, wherein the clay is recovered and stored as a solid matter. 粗分離及び精密分離されたシルト分及び粘土分を含む濃縮液の乾燥時に、肥効成分及び造粒助剤を添加させるようにする請求項記載の掘削泥水処理方法。The drilling mud treatment method according to claim 4 , wherein a fertilizer and a granulation aid are added at the time of drying the concentrated liquid containing the silt and clay components separated roughly and precisely . 粗分離及び精密分離されたシルト分及び粘土分を含む濃縮液を乾燥させるときに発生した水蒸気を凝縮させて回収させるようにする請求項又は記載の掘削泥水処理方法。The drilling mud treatment method according to claim 4 or 5 , wherein water vapor generated when the concentrated liquid containing silt and clay separated roughly and precisely is dried is condensed and recovered. 掘削装置による掘削個所に成分調整された泥水を送り、掘削に供した後に回収された土砂を含む掘削泥水を、分離機によりずり及び砂分を分離除去してから比重調整槽へ導いて泥水として循環させて使用するようにしてある掘削泥水処理装置において、上記分離機にて分離させたずり及び砂分を洗浄用水によりそれぞれ洗浄するようにした洗浄装置と、洗浄後のずり及び砂分を別々に貯留するずり貯留コンテナ及び砂貯留コンテナとを備え、且つずり及び砂分の洗浄装置からの固形分を分離除去した廃水を比重調整槽からの廃棄泥水に合流させるようにした原液槽を備え、更に該原液槽内の原液中のシルト分及び粘土分を粗分離する遠心分離機と、遠心分離後の分離液中からシルト分及び粘土分を精密分離する膜分離装置とを備えた構成を有することを特徴とする掘削泥水処理装置。The muddy water whose components are adjusted is sent to the excavation site by the excavator, and the excavated mud containing the earth and sand collected after excavation is separated and removed by the separator, and then guided to the specific gravity adjustment tank as muddy water. In a drilling mud treatment apparatus that is intended to be circulated, the scrub and sand separated by the separator are respectively washed with washing water, and the scrub and sand after washing are separated separately. A waste storage container and a sand storage container, and a waste liquid tank that separates and removes solid content from the cleaning apparatus for the shear and sand, and a waste liquid tank that joins the waste mud from the specific gravity adjustment tank , Yes further a centrifugal separator for coarse separating silt and clay content in the undiluted stock solution tank, a configuration in which a membrane separation device to precisely separate the silt and clay content from the separation liquid after centrifuging Drilling mud processing apparatus according to claim Rukoto. 掘削装置による掘削個所に成分調整された泥水を送り、掘削に供した後に回収された土砂を含む掘削泥水を、分離機によりずり及び砂分を分離除去してから比重調整槽へ導いて泥水として循環させて使用するようにしてある掘削泥水処理装置において、上記分離機にて分離させたずり及び砂分を洗浄用水によりそれぞれ洗浄するようにした洗浄装置と、洗浄後のずり及び砂分を別々に貯留するずり貯留コンテナ及び砂貯留コンテナとを備えると共に、分離機にてずり及び砂分を分離除去した後の掘削泥水中に含まれる油分を加圧浮上させて回収する加圧浮上槽と、回収した油分を焼却処理する焼却炉と、焼却灰を貯留する焼却灰貯留コンテナとを備え、且つずり及び砂分の洗浄装置からの固形分を分離除去した廃水を比重調整槽からの廃棄泥水に合流させるようにした原液槽を備え、更に該原液槽内の原液中のシルト分及び粘土分を粗分離する遠心分離機と、遠心分離後の分離液中からシルト分及び粘土分を精密分離する膜分離装置とを備えた構成を有することを特徴とする掘削泥水処理装置。The muddy water whose components are adjusted is sent to the excavation site by the excavator, and the excavated mud containing the earth and sand collected after excavation is separated and removed by the separator, and then guided to the specific gravity adjustment tank as muddy water. In a drilling mud treatment apparatus that is intended to be circulated, the scrub and sand separated by the separator are respectively washed with washing water, and the scrub and sand after washing are separated separately. Rutotomoni a shear storage container and sand storage container for storing, the separator in the upper shear and floatation recovered was pressurized floating oil contained in the drilling mud after separation is removed sand fraction tank the incinerator for incineration of recovered oil, and a ash storage container for storing ash and waste mud wastewater separated remove solids from shear and sand content of the cleaning device from the gravity adjusting tank Comprising a stock solution tank which is adapted to join the further the centrifuge for coarse separation of silt and clay content in the undiluted stock solution tank, precise separation of silt and clay content from the separation liquid after centrifugation A drilling mud treatment apparatus characterized by having a configuration including a membrane separation device. 遠心分離後の分離液中から膜分離装置でシルト分及び粘土分を精密分離した後の濾液の水質を検査する水質検査装置を備えた請求項又は記載の掘削泥水処理装置。The drilling mud treatment apparatus according to claim 7 or 8, further comprising a water quality inspection device that inspects the water quality of the filtrate after the silt content and the clay content are precisely separated from the separated liquid after centrifugation by a membrane separation device. 遠心分離機及び膜分離装置で分離させたシルト分及び粘土分を含む濃縮液を熱風の気流に噴霧して水分を瞬間的に乾燥させてシルト分及び粘土分を固形物として回収するスプレードライヤーと、固形物として回収したシルト分及び粘土分を貯留するシルト貯留コンテナとを備えた請求項又は記載の掘削泥水処理装置。A spray dryer for spraying a concentrated liquid containing silt and clay separated by a centrifugal separator and a membrane separator onto a hot air stream to instantaneously dry the water and recovering the silt and clay as solids The drilling mud treatment apparatus according to claim 7 or 8, further comprising a silt storage container for storing a silt component and a clay component recovered as a solid matter. シルト分及び粘土分を固形物として回収するスプレードライヤーで濃縮液を熱風の気流に噴霧して水分を瞬間的に乾燥させるときに発生した水蒸気を凝縮させる凝縮器を備えた請求項10記載の掘削泥水処理装置。The excavation of Claim 10 provided with the condenser which condenses the water vapor | steam generated when a concentrated liquid is sprayed on the airflow of a hot air with the spray dryer which collect | recovers a silt part and clay as a solid substance, and water | moisture content is dried instantaneously. Muddy water treatment equipment.
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US7935261B2 (en) 2008-11-24 2011-05-03 Arkansas Reclamation Company, Llc Process for treating waste drilling mud
KR101103052B1 (en) 2009-09-10 2012-01-05 (주)성인 Water purification apparatus for a drilling machine
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JP2018069168A (en) * 2016-10-31 2018-05-10 五洋建設株式会社 Washing method of force feed pipeline

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