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JP2007090197A - Cleaning method of ground water/soil - Google Patents

Cleaning method of ground water/soil Download PDF

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Publication number
JP2007090197A
JP2007090197A JP2005281505A JP2005281505A JP2007090197A JP 2007090197 A JP2007090197 A JP 2007090197A JP 2005281505 A JP2005281505 A JP 2005281505A JP 2005281505 A JP2005281505 A JP 2005281505A JP 2007090197 A JP2007090197 A JP 2007090197A
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soil
groundwater
hydrogen peroxide
ground water
aeration tank
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JP2005281505A
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Japanese (ja)
Inventor
Kenichi Kimizuka
健一 君塚
Yasushi Hiramatsu
靖史 平松
Masaru Tazaki
賢 田崎
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Mitsubishi Gas Chemical Co Inc
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Mitsubishi Gas Chemical Co Inc
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Priority to JP2005281505A priority Critical patent/JP2007090197A/en
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  • Degasification And Air Bubble Elimination (AREA)
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  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning method of a ground water/a soil which are contaminated with a volatile organic material. <P>SOLUTION: The cleaning method of the ground water/the soil has a pumping well, aeration tank, water injection well and adsorbing tower, and clarifies the ground water/the soil contaminated with the volatile organic compound by hydrogen peroxide, wherein aeration is carried out by microbubbles. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、揮発性有機化合物に汚染された地下水・土壌の浄化方法に関する。   The present invention relates to a method for purifying groundwater and soil contaminated with volatile organic compounds.

揚水井、曝気槽、注水井及び吸着塔を備え、過酸化水素を用いて地下水・土壌の浄化を行う方法における曝気槽は、ストリッピング式やスプレー塔式が使用されるのが一般的である。ストリッピング式は、揚水した地下水をベンチュリー管から高速噴霧し、微細な液滴とすることで表面積を広げ、溶存している有害物質を効率的に気散させることに特徴がある。しかしながら、この方法では、高速噴霧された液滴が広がる部分の体積と、ミストトラップ、吸着塔が大きくなる欠点を有しており、処理能力の割に大きな設備を用いなければならない。また、スプレー塔式は、揚水した地下水を塔上部より、ブロワーによる空気を塔下部より送り込んで、塔内部に充填した充填物(テラレット等)上で接触させる。この方法でも気液接触を十分に行わせるためには、充填物に大きな面積を持たせることが必要であり、装置の大型化が避けられない。   A stripping type or spray tower type is generally used as an aeration tank in a method that includes a pumping well, an aeration tank, a water injection well, and an adsorption tower and purifies groundwater and soil using hydrogen peroxide. . The stripping type is characterized in that the groundwater that has been pumped is sprayed at high speed from a Venturi tube to form fine droplets to increase the surface area and efficiently disperse dissolved harmful substances. However, this method has the disadvantage that the volume of the portion where the droplets sprayed at high speed spread, the mist trap and the adsorption tower become large, and a large facility must be used for the processing capacity. In the spray tower type, pumped ground water is sent from the upper part of the tower and blower air is sent from the lower part of the tower, and brought into contact with a packing (such as terralet) filled in the tower. Even in this method, in order to sufficiently perform the gas-liquid contact, it is necessary to give the packing a large area, and the enlargement of the apparatus is inevitable.

揮発性有機化合物(VOC)に汚染された地下水・土壌を浄化する方法としては、地下水・土壌に酸化剤を注入することにより地下水・土壌中のVOCを分解処理する方法があり、例えば、次のような方法が提案されている。特許文献1には、土壌中に井戸を立設し、井戸内に貯留された地下水中をオゾン含有気体で曝気し、地下水中の有害物質をオゾンの酸化作用により分解する方法が開示されている。また、この発明ではオゾンの他に、紫外線や過酸化水素等の酸化剤も併用する方法も開示されている。この方法では、生物に悪影響を及ぼすオゾンや紫外線を使用し、更に井戸等の一般的な設備の他に、オゾンや紫外線の発生装置も備えなければならず、経済的に得策ではない。   As a method of purifying groundwater / soil contaminated with volatile organic compounds (VOC), there is a method of decomposing VOC in groundwater / soil by injecting an oxidizing agent into the groundwater / soil. Such a method has been proposed. Patent Document 1 discloses a method in which a well is erected in soil, groundwater stored in the well is aerated with an ozone-containing gas, and harmful substances in the groundwater are decomposed by the oxidizing action of ozone. . The invention also discloses a method in which an oxidizing agent such as ultraviolet rays or hydrogen peroxide is used in addition to ozone. In this method, ozone and ultraviolet rays that adversely affect living organisms are used, and in addition to general equipment such as wells, ozone and ultraviolet ray generators must be provided, which is not economically advantageous.

また、特許文献2には、有機塩素化合物に汚染された土壌に、注水井戸を介して過マンガン酸塩を注入し、揚水井から汲み上げられた水に過酸化水素を添加する方法が開示されている。この方法では、更なる汚染源となり得る過マンガン酸塩を添加するため、有機塩素化合物の汚染が除去されたとしても、マンガンによる二次汚染が発生する恐れがある。
特開2001−9480号公報 特開2002−301486号公報
Patent Document 2 discloses a method in which permanganate is injected into soil contaminated with an organic chlorine compound through a water injection well, and hydrogen peroxide is added to water pumped from a pumping well. Yes. In this method, since permanganate that can be a further source of contamination is added, even if the contamination of the organochlorine compound is removed, secondary contamination with manganese may occur.
JP 2001-9480 A JP 2002-301486 A

本発明の目的は、従来の技術の問題を解決し、コンパクトで然も環境負荷の少ないVOC汚染地下水・土壌の浄化方法を提供することにある。   An object of the present invention is to solve the problems of the prior art and provide a method for purifying VOC-contaminated groundwater and soil that is compact and has a low environmental impact.

発明者らは、上記課題に対し鋭意検討を行った結果、揚水井、曝気槽、注水井及び吸着塔を備え、過酸化水素を用いてVOCに汚染された地下水・土壌を浄化する方法において、曝気をマイクロバブルで行うことで、コンパクトな装置でもVOCの分解と除去が効率良く行われることを見出し、本発明を完成させるに至った。すなわち、本発明は、揚水井、曝気槽、注水井及び吸着塔を備え、揮発性有機化合物に汚染された地下水・土壌を過酸化水素により浄化する方法において、曝気をマイクロバブルで行うことを特徴とする地下水・土壌の浄化方法。   As a result of earnestly examining the above problems, the inventors have a pumping well, an aeration tank, a water injection well, and an adsorption tower, and in a method of purifying groundwater / soil contaminated with VOC using hydrogen peroxide, By performing aeration with microbubbles, it has been found that VOC can be efficiently decomposed and removed even in a compact device, and the present invention has been completed. That is, the present invention comprises a pumping well, an aeration tank, a water injection well, and an adsorption tower, and in the method of purifying groundwater / soil contaminated with volatile organic compounds with hydrogen peroxide, aeration is performed with microbubbles. Purification method for groundwater and soil.

本発明によれば、揚水井、曝気槽、注水井及び吸着塔を備え、過酸化水素を用いて揮発性有機物に汚染された地下水・土壌を浄化する方法において、経済的に優位に、然も短期間でVOCの除去が可能となる。   According to the present invention, in a method comprising a pumping well, an aeration tank, a water injection well, and an adsorption tower, and purifying groundwater / soil contaminated with volatile organic substances using hydrogen peroxide, it is economically superior. VOC can be removed in a short period of time.

本発明では、浄化対象となる区域を鋼矢板等の遮水壁で囲み、その内側に揚水井と注水井を掘削する。そして注水井から過酸化水素水溶液を注入し、VOCと過酸化水素を接触させる。その後、揚水井から地下水を汲み上げ曝気槽に受け入れる。曝気槽では、マイクロバブルによって残存している過酸化水素が活性化され、未反応VOCの一部を分解すると共に、一部のVOCがマイクロバブルに同伴されて効率よく気相に脱気される。このため、曝気槽はマイクロバブル装置を有した水槽部分に水面上部に空間を持つシンプルかつコンパクトな構造となる。気化したVOCは、曝気槽上部に備えた吸着塔で吸着・回収される。VOCが除去された水には、未だマイクロバブルが残存しているが、そのまま注水井に導き、過酸化水素水溶液と共に地下に戻される。注水井より供給された過酸化水素とマイクロバブルを含有する水は、通常の過酸化水素水溶液に比べて浸透力が高く、高効率でVOCの抽出を行うことが出来る。未反応VOCを回収する吸着塔は、広く工業的に使用されている活性炭吸着塔等が使用可能である。   In the present invention, an area to be purified is surrounded by a water shielding wall such as a steel sheet pile, and a pumping well and a water injection well are excavated inside. Then, an aqueous hydrogen peroxide solution is injected from the water injection well, and the VOC and hydrogen peroxide are brought into contact with each other. Then, the groundwater is pumped from the pumping well and received in the aeration tank. In the aeration tank, the remaining hydrogen peroxide is activated by the microbubbles, and a part of the unreacted VOC is decomposed, and part of the VOC is accompanied by the microbubbles and efficiently degassed to the gas phase. . For this reason, the aeration tank has a simple and compact structure in which a water tank portion having a microbubble device has a space above the water surface. The vaporized VOC is adsorbed and collected by an adsorption tower provided in the upper part of the aeration tank. In the water from which the VOC has been removed, microbubbles still remain, but they are led directly to the water injection well and returned to the ground together with the hydrogen peroxide solution. Water containing hydrogen peroxide and microbubbles supplied from a water injection well has higher osmotic power than ordinary aqueous hydrogen peroxide solutions, and can perform VOC extraction with high efficiency. As the adsorption tower for recovering the unreacted VOC, an activated carbon adsorption tower or the like widely used industrially can be used.

本発明における過酸化水素は、市販の過酸化水素が使用出来る。また、過酸化水素の濃度に特に制限はないが、注水井での濃度で通常0.1〜5重量%の濃度で実施される。これ以下の濃度では、効果が低く、高すぎると地下水のpHの低下を招き、二次汚染の危険性が増加する。   Commercially available hydrogen peroxide can be used as the hydrogen peroxide in the present invention. Moreover, there is no restriction | limiting in particular in the density | concentration of hydrogen peroxide, However, It implements by the density | concentration of 0.1-5 weight% normally with the density | concentration in a water injection well. Below this concentration, the effect is low, and if it is too high, the pH of the groundwater is lowered and the risk of secondary contamination increases.

マイクロバブルは、空気せん断流型のノズルで発生させた気泡が好ましい。キャビテーション方式等で発生させたマイクロバブルでは、気泡の安定性が悪く、地下でのVOC抽出効果が不十分である。空気せん断流型のノズルとしては、大成式(徳山工業高等専門学校 大成博文教授開発)やOHR流体工学研究所式が好適に使用される。但し、これらのノズルはSS等の固形分の存在を嫌うため、ノズル手前にストレーナーを設けることが好ましい。マイクロバブルを形成させる気体の種類にも制限はなく、空気以外の気体も使用可能である。   The microbubbles are preferably bubbles generated by an air shear flow type nozzle. Microbubbles generated by a cavitation method or the like have poor bubble stability and insufficient VOC extraction effect in the basement. As the air shear flow type nozzle, the Taisei formula (developed by Professor Hirofumi Taisei, Tokuyama National College of Technology) and the OHR Fluid Engineering Laboratory formula are preferably used. However, since these nozzles dislike the presence of solids such as SS, it is preferable to provide a strainer in front of the nozzles. There is no restriction | limiting also in the kind of gas which forms a microbubble, Gas other than air can also be used.

以下に実施例を挙げて本発明を更に詳しく説明するが、本発明はこれらの実施例によりその範囲を制限されるものではない。   The present invention will be described in more detail with reference to examples below, but the scope of the present invention is not limited by these examples.

地表面から5mの深さに帯水層が存在し、その地下水が約20ppmのトリクロロエチレン(TCE)で汚染されている現場において、汚染域の周辺を鋼矢板で囲み、10m四方の独立した区画を作った。その区画内に揚水井を一本と、揚水井から5m離れた上流側に注水井を一本掘削し、揚水井の出口に容積200リットルの曝気槽と活性炭吸着塔を設置した。曝気槽にはOHR式マイクロバブル発生装置を付帯させた。   In a site where an aquifer exists at a depth of 5 m from the ground surface and the groundwater is contaminated with about 20 ppm of trichlorethylene (TCE), the area around the contaminated area is surrounded by steel sheet piles, and an independent section of 10 m square is formed. Had made. One pumping well and one injection well were drilled in the section 5m upstream from the pumping well, and a 200-liter aeration tank and activated carbon adsorption tower were installed at the outlet of the pumping well. An OHR microbubble generator was attached to the aeration tank.

揚水井から毎分20リットルの速さで地下水を揚水し、曝気槽で毎分1リットルの速度で発生させたマイクロバブルと接触させた。曝気槽から排出される気泡で白濁した液をそのまま注水井に導き、35重量%過酸化水素水溶液を毎分1.5リットル添加しながら毎分20リットルの速さで地下に戻した。この操作における過酸化水素の濃度は、注水井で2.5重量%、揚水井で20ppmであった。この処理を20日間連続で行った結果、地下水中のTCE濃度は約8ppmであった。また、処理期間中に吸着塔から排出されるオフガス中からは、TCEは検出されなかった。   Groundwater was pumped from the pumping well at a rate of 20 liters per minute and contacted with microbubbles generated at a rate of 1 liter per minute in an aeration tank. The liquid that became cloudy with bubbles discharged from the aeration tank was directly introduced into the water injection well, and returned to the basement at a rate of 20 liters per minute while adding 1.5 liters of a 35% by weight aqueous hydrogen peroxide solution per minute. The concentration of hydrogen peroxide in this operation was 2.5% by weight in the injection well and 20 ppm in the pumping well. As a result of carrying out this treatment for 20 consecutive days, the TCE concentration in the groundwater was about 8 ppm. Further, TCE was not detected from the off gas discharged from the adsorption tower during the treatment period.

Claims (2)

揚水井、曝気槽、注水井及び吸着塔を備え、揮発性有機化合物に汚染された地下水・土壌を過酸化水素により浄化する方法において、曝気をマイクロバブルで行うことを特徴とする地下水・土壌の浄化方法。   A method for purifying groundwater / soil contaminated with volatile organic compounds with hydrogen peroxide, equipped with a pumping well, an aeration tank, a water injection well, and an adsorption tower. Purification method. マイクロバブルを空気せん断流型の装置で発生させる請求項1記載の地下水・土壌の浄化方法。   2. The groundwater / soil purification method according to claim 1, wherein the microbubbles are generated by an air shear flow type apparatus.
JP2005281505A 2005-09-28 2005-09-28 Cleaning method of ground water/soil Pending JP2007090197A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008284272A (en) * 2007-05-21 2008-11-27 Hiroshima Univ Odor component decomposition or sterilization apparatus, method for decomposing odor component or sterilization of germs, and air cleaning apparatus
JP2014180628A (en) * 2013-03-19 2014-09-29 Kubota Corp Water treatment method and system
JP2014221969A (en) * 2013-05-13 2014-11-27 鹿島建設株式会社 Soil desaturation system and soil improvement method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0691276A (en) * 1992-09-11 1994-04-05 Nippon Steel Corp Treatment of organic halogen compound-containing waste water
JP2001259664A (en) * 2000-03-22 2001-09-25 Air Water Inc Method and apparatus for purifying contaminated water and gas
JP2001347255A (en) * 2000-06-12 2001-12-18 Shinichi Ueda Method for decontaminating soil and groundwater
JP2002159959A (en) * 2000-11-22 2002-06-04 Japan Organo Co Ltd Method and device for purifying underground polluted region
JP2003047952A (en) * 2001-08-07 2003-02-18 Azuma Engineering:Kk Groundwater purification apparatus and groundwater purification method
JP2005118664A (en) * 2003-10-16 2005-05-12 Fuso Kensetsu Kogyo Kk Groundwater purification method and apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0691276A (en) * 1992-09-11 1994-04-05 Nippon Steel Corp Treatment of organic halogen compound-containing waste water
JP2001259664A (en) * 2000-03-22 2001-09-25 Air Water Inc Method and apparatus for purifying contaminated water and gas
JP2001347255A (en) * 2000-06-12 2001-12-18 Shinichi Ueda Method for decontaminating soil and groundwater
JP2002159959A (en) * 2000-11-22 2002-06-04 Japan Organo Co Ltd Method and device for purifying underground polluted region
JP2003047952A (en) * 2001-08-07 2003-02-18 Azuma Engineering:Kk Groundwater purification apparatus and groundwater purification method
JP2005118664A (en) * 2003-10-16 2005-05-12 Fuso Kensetsu Kogyo Kk Groundwater purification method and apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008284272A (en) * 2007-05-21 2008-11-27 Hiroshima Univ Odor component decomposition or sterilization apparatus, method for decomposing odor component or sterilization of germs, and air cleaning apparatus
JP2014180628A (en) * 2013-03-19 2014-09-29 Kubota Corp Water treatment method and system
JP2014221969A (en) * 2013-05-13 2014-11-27 鹿島建設株式会社 Soil desaturation system and soil improvement method

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