JPH09234488A - How to remediate contaminated groundwater and soil - Google Patents
How to remediate contaminated groundwater and soilInfo
- Publication number
- JPH09234488A JPH09234488A JP4336796A JP4336796A JPH09234488A JP H09234488 A JPH09234488 A JP H09234488A JP 4336796 A JP4336796 A JP 4336796A JP 4336796 A JP4336796 A JP 4336796A JP H09234488 A JPH09234488 A JP H09234488A
- Authority
- JP
- Japan
- Prior art keywords
- groundwater
- bioreactor
- soil
- saturated layer
- well
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Landscapes
- Processing Of Solid Wastes (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
(57)【要約】
【課題】 バイオレメディエーションによる浄化、修復
を行う際、短時間で分解、除去が可能であり、かつ不飽
和層の汚染物質の分解除去も可能とする方法を提供す
る。
【解決手段】 汚染物質で汚染された地下汚染箇所1の
近傍の飽和層12に２本以上の井戸21,22を掘削し、地下
汚染箇所1の近傍の飽和層12に２つ以上の電極23,24を離
間して埋設し、水素を利用してメタンを生成するバイオ
リアクター25を地上に設ける。電極間23,24に電圧を加
えて陰極24で発生する水素をバイオリアクター25に供給
する。地下汚染箇所1の地下水流5下流側に位置する井戸
22から揚水した地下水をバイオリアクター25に導入し、
バイオリアクター25で生成されたメタン、および陽極23
で発生する酸素とともに、地下汚染箇所1の地下水流5上
流側に位置する井戸21から飽和層12に注水する。
(57) Abstract: [PROBLEMS] To provide a method capable of decomposing and removing in a short time when purifying and repairing by bioremediation and also capable of decomposing and removing contaminants in an unsaturated layer. SOLUTION: Two or more wells 21 and 22 are drilled in a saturated layer 12 near the underground pollution point 1 contaminated with pollutants, and two or more electrodes 23 are formed in the saturated layer 12 near the underground pollution point 1. , 24 are buried separately from each other, and a bioreactor 25 that produces methane using hydrogen is installed on the ground. A voltage is applied between the electrodes 23 and 24 to supply hydrogen generated at the cathode 24 to the bioreactor 25. Well located downstream of groundwater flow 5 at underground pollution point 1
The groundwater pumped from 22 is introduced into the bioreactor 25,
Methane produced in bioreactor 25, and anode 23
Water is injected into the saturated layer 12 from the well 21 located on the upstream side of the groundwater flow 5 at the underground pollution point 1 together with the oxygen generated at.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、トリクロロエチレ
ンなどの有機塩素化合物や廃油などの汚染物質によって
汚染された土壌、地下水を修復、浄化する技術に関す
る。TECHNICAL FIELD The present invention relates to a technique for repairing and purifying soil and groundwater contaminated with organic chlorine compounds such as trichlorethylene and pollutants such as waste oil.
【０００２】[0002]
【従来の技術】このような汚染土壌、地下水から汚染物
質を取り除く浄化方法として、最近、バイオテクロノジ
ーを利用したバイオレメディエーション（原位置バイオ
レメディエーションとも呼ばれる。）が注目を集めてい
る。バイオレメディエーションは、土壌中に生息する微
生物の機能を利用して汚染物質を分解し無害化する技術
であり、土壌生態系が本来有している浄化機能を人為的
に強化し利用するものである。2. Description of the Related Art Recently, bioremediation (also called in-situ bioremediation) utilizing biotechnology has been attracting attention as a purification method for removing pollutants from such contaminated soil and groundwater. Bioremediation is a technology that decomposes and detoxifies pollutants by utilizing the function of microorganisms that live in the soil, and artificially enhances and uses the purification function originally possessed by the soil ecosystem. .
【０００３】図２は、従来のバイオレメディエーション
技術による浄化方法の一例を模式的に示すものである。
図中符号２は飽和層であり地下水が流れている。この方
法では、有機塩素化合物や油分などの汚染物質で汚染さ
れた地下汚染箇所１の近傍の飽和層２に二本以上の井戸
３，４を掘削する。地下水流５の下流側に掘削された揚
水井戸４から揚水した地下水の少なくとも一部を基質添
加手段６に導き、分解菌の生育基質等になるメタンやフ
ェノール、空気（酸素）、および栄養源等を加え、これ
を上流側に掘削された注入井戸３へ注入し、循環する。
これにより飽和層２等に存在する汚染物質分解菌の活性
を高め、汚染物質の分解、除去を効率よく行うことがで
き、コストパフォーマンスの高い修復方法とされてい
る。FIG. 2 schematically shows an example of a purification method by a conventional bioremediation technique.
Reference numeral 2 in the figure is a saturated layer in which groundwater flows. In this method, two or more wells 3 and 4 are excavated in the saturated layer 2 in the vicinity of the underground contaminated site 1 contaminated with pollutants such as organic chlorine compounds and oil. At least a part of the groundwater pumped from the pumping well 4 drilled on the downstream side of the groundwater flow 5 is guided to the substrate adding means 6, and becomes methane, phenol, air (oxygen), and a nutrient source which become growth substrates for decomposing bacteria. Is added, and this is injected into the injection well 3 excavated on the upstream side and circulated.
As a result, the activity of the pollutant-degrading bacteria present in the saturated layer 2 and the like can be enhanced, and the pollutant can be efficiently decomposed and removed, and the restoration method has high cost performance.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、このバ
イオレメディエーションによる浄化方法にあっては、ト
リクロロエチレンなどの有機塩素化合物の汚染物質は原
液状で存在していたり、粘土質や土壌中の有機物に吸着
されているものも多く、徐々にこれらが地下水中に離脱
してくるため、除去に比較的長時間を要する欠点があ
る。また、地下水が飽和の状態で存在する飽和層での分
解、除去は可能であるが、地下水が不飽和で空気等が存
在する間隙がある不飽和層での分解、除去は困難である
などの問題を有している。However, in this purification method by bioremediation, pollutants of organic chlorine compounds such as trichlorethylene are present in a liquid state or are adsorbed by clay and organic matter in soil. Many of them are removed, and these are gradually released into the groundwater, which has the disadvantage that it takes a relatively long time to remove them. In addition, although it is possible to decompose and remove it in a saturated layer where groundwater exists in a saturated state, it is difficult to decompose and remove it in an unsaturated layer where groundwater is unsaturated and there is a gap where air etc. exist. I have a problem.
【０００５】本発明の課題は、バイオレメディエーショ
ンによる浄化、修復を行う際、短時間で分解、除去が可
能であり、かつ不飽和層の汚染物質の分解除去も可能と
する方法の提供にある。An object of the present invention is to provide a method capable of decomposing and removing in a short time when purifying and repairing by bioremediation and also capable of decomposing and removing contaminants in an unsaturated layer.
【０００６】[0006]
【課題を解決するための手段】前記課題を解決するため
に請求項１に係る発明は、汚染物質で汚染された地下汚
染箇所の近傍の飽和層に２本以上の井戸を掘削し、該地
下汚染箇所の近傍の飽和層に２つ以上の電極を離間して
埋設し、水素を利用してメタンを生成するバイオリアク
ターを地上に設けるとともに、前記電極間に電圧を加
え、陰極で発生する水素を前記バイオリアクターに供給
しつつ、地下水流下流側に位置する井戸から揚水した地
下水の少なくとも一部を前記バイオリアクターに導入
し、該バイオリアクターで生成されたメタンとともに、
前記地下汚染箇所の地下水流上流側に位置する井戸から
飽和層に注水することを特徴とする汚染地下水、土壌の
修復方法である。請求項２に係る発明は、前記井戸から
揚水した地下水の少なくとも一部に、前記電極間に電圧
を加えて陽極で発生する酸素を加えた後、飽和層に注水
することを特徴とする請求項１記載の汚染地下水、土壌
の修復方法である。請求項３に係る発明は、前記井戸か
ら揚水した地下水の少なくとも一部に、土壌中の汚染物
質分解菌の栄養源を添加した後、飽和層に注水すること
を特徴とする請求項１または２記載の汚染地下水、土壌
の修復方法である。In order to solve the above-mentioned problems, the invention according to claim 1 excavates two or more wells in a saturated layer in the vicinity of an underground polluted place contaminated with pollutants, Hydrogen is generated at the cathode by burying two or more electrodes in a saturated layer in the vicinity of the contaminated site, with a space between them, and installing a bioreactor on the ground that uses hydrogen to generate methane. While supplying to the bioreactor, at least a portion of groundwater pumped from a well located on the groundwater flow downstream side is introduced into the bioreactor, together with methane produced in the bioreactor,
The method for restoring contaminated groundwater and soil is characterized by injecting water into a saturated layer from a well located upstream of the groundwater flow at the underground contamination site. The invention according to claim 2 is characterized in that at least a part of groundwater pumped from the well is supplied with voltage between the electrodes to add oxygen generated at the anode, and then water is injected into the saturated layer. The method for remediating contaminated groundwater and soil according to 1. The invention according to claim 3 is characterized in that a nutrient source for pollutant-decomposing bacteria in soil is added to at least a part of groundwater pumped from the well, and then water is poured into a saturated layer. It is a method of remediating the contaminated groundwater and soil described.
【０００７】[0007]
【発明の実施の形態】以下、本発明を詳しく説明する。
図１は、本発明による汚染地下水、土壌の修復方法の一
例を示すものである。この例では、有機塩素化合物など
の汚染物質で汚染された地下汚染箇所１近傍の飽和層
の、地下汚染箇所１の上流側と下流側にそれぞれ井戸２
１，２２が掘削され、これらの井戸２１，２２のさらに
上流側および下流側にそれぞれ電極２３，２４が埋設さ
れ、さらに地上には水素を利用してメタンを生成するバ
イオリアクター２５が設けられている。BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below.
FIG. 1 shows an example of a method for repairing contaminated groundwater and soil according to the present invention. In this example, wells 2 are provided on the upstream side and the downstream side of the underground pollution point 1 in the saturated layer near the underground pollution point 1 contaminated with pollutants such as organic chlorine compounds.
1, 22 are excavated, electrodes 23, 24 are buried further upstream and downstream of these wells 21, 22 respectively, and a bioreactor 25 for producing methane using hydrogen is provided on the ground. There is.
【０００８】この地下汚染箇所１の地層は、地下水流５
に示すように地下水が流れている飽和層１２と、その上
層の不飽和層１１と、飽和層１２の下にある不透水層１
３とからなっている。汚染物質は不飽和層１１や飽和層
１２に多く、特にそれぞれの層の境界部分に多く存在し
ており、離脱し難い状態で存在している。トリクロロエ
チレンなどの有機塩素化合物の汚染物質は、地層の境界
部分に原液状で蓄積されていたり、粘土質や土壌中の有
機物に吸着されやすい。このため飽和層１２では、汚染
物質が徐々に地下水中に離脱し、この地下水中には汚染
物質が含有されている。[0008] The stratum at this underground pollution point 1 is composed of a groundwater flow 5
The saturated layer 12 in which groundwater flows, the unsaturated layer 11 above it, and the impermeable layer 1 below the saturated layer 12
It consists of three. A large amount of pollutants is present in the unsaturated layer 11 and the saturated layer 12, especially in the boundary portion between the respective layers, and is present in a state where it is difficult to separate. Contaminants of organochlorine compounds such as trichlorethylene are easily accumulated in the liquid state at the boundary of the stratum, or are easily adsorbed by clay and organic matter in soil. Therefore, in the saturated layer 12, the pollutants are gradually released into the groundwater, and the groundwater contains the pollutants.
【０００９】前記井戸２１，２２は、地下汚染箇所１の
近傍の飽和層１２に十分達する深さに掘削されている。
井戸２１，２２は２本以上設けられ、少なくとも地下汚
染箇所１の地下水流５上流側と地下水流５下流側に設け
られている。地下汚染箇所１の地下水流５下流側に設け
られた井戸２２には揚水パイプが底の近くまで挿入され
ており、ポンプで地下水を揚水できるようになってい
る。また地下汚染箇所１の地下水流５上流側に設けられ
た井戸２１は、ここから飽和層１２に注水できるように
構成されており、例えば透水性パイプが挿入されてい
る。井戸２１，２２は、地下汚染箇所１よりも地下水流
５上流側に少なくとも１本の注水用の井戸２１が設けら
れ、かつこれよりも下流側に揚水用の井戸２２が設けら
れていればよく、井戸の本数や設置位置は適宜変更可能
である。The wells 21 and 22 are excavated to a depth enough to reach the saturated layer 12 near the underground pollution site 1.
Two or more wells 21 and 22 are provided, and are provided at least on the upstream side of the groundwater flow 5 and on the downstream side of the groundwater flow 5 in the underground pollution site 1. A pumping pipe is inserted into the well 22 provided on the downstream side of the groundwater flow 5 at the underground pollution point 1 up to near the bottom so that the pump can pump the groundwater. Further, the well 21 provided upstream of the groundwater flow 5 in the underground pollution place 1 is configured so that water can be poured into the saturated layer 12 from here, and a water-permeable pipe is inserted, for example. The wells 21 and 22 may be provided with at least one well 21 for water injection on the upstream side of the groundwater flow 5 with respect to the underground pollution point 1 and a well 22 for pumping water on the downstream side. The number of wells and the installation positions can be changed as appropriate.
【００１０】前記電極２３，２４は、飽和層１２に十分
達する深さに挿入された導電体であればよく、材質や形
状は特に限定されない。例えば飽和層１２に十分達する
深さに打ち込まれたグラファイト等からなる電極板が使
用可能である。電極２３，２４は２つ以上設けられ、少
なくとも地下汚染箇所１の地下水流５上流側と下流側に
それぞれ設けられる。The electrodes 23, 24 may be conductors inserted to a depth enough to reach the saturated layer 12, and the material and shape are not particularly limited. For example, it is possible to use an electrode plate made of graphite or the like that is driven into the saturated layer 12 to a sufficient depth. Two or more electrodes 23, 24 are provided, at least on the upstream side and the downstream side of the groundwater flow 5 of the underground pollution site 1, respectively.
【００１１】これらの電極２３，２４間には、地下水流
５の上流側の電極２３を陽極（＋）とし、下流側の電極
２４を陰極（−）とするように直流電流が加えられる。
これら電極２３，２４間に加える電圧は、汚染物質の離
脱、移動を促進させることができ、しかもロスが生じな
い範囲とされ、地中の導電性に応じて数Ｖ〜数百Ｖの範
囲で適宜変更してよい。また、電極２３，２４の本数お
よび設置位置は、注水用の井戸２１よりも地下水流５下
流側の飽和層１２中に、汚染物質を効率よく離脱、移動
できるように、地下の汚染状態や地下水流５に応じて適
宜設定してよい。また電極２３，２４の正負を随時切り
替えてもよい。A direct current is applied between the electrodes 23 and 24 so that the upstream electrode 23 of the groundwater flow 5 serves as an anode (+) and the downstream electrode 24 serves as a cathode (-).
The voltage applied between these electrodes 23, 24 is in a range that can promote the separation and movement of pollutants and does not cause loss, and is in the range of several V to several hundred V depending on the conductivity of the ground. You may change it appropriately. Moreover, the number and the installation positions of the electrodes 23 and 24 are set so that the pollutants can be efficiently separated and moved into the saturated layer 12 on the downstream side of the groundwater flow 5 with respect to the water injection well 21 so that the pollutants in the underground and the groundwater are not removed. It may be appropriately set according to the flow 5. Further, the positive and negative of the electrodes 23 and 24 may be switched at any time.
【００１２】前記バイオリアクター２５は、嫌気リアク
ター内に水素資化メタン生成細菌を生育させてなるもの
で、地上に設置されている。ここで用いられる水素資化
メタン生成細菌は、水素を利用してメタンを生成し得る
菌であればよく、例えば、メタノバクテリウム（Methan
obacterium）属に属するメタン生成菌、メタノコッカス
（Methanococcus）属に属するメタン生成菌等の嫌気性
のメタン生成菌を用いることができる。このバイオリア
クター２５には、陰極２４で発生する水素（Ｈ2）が導
入されるように構成されており、この水素を利用して水
素資化メタン生成細菌によりメタンが生成される。また
バイオリアクター２５には、揚水用の井戸２２から揚水
された地下水の少なくとも一部が導入され、水素資化メ
タン生成細菌によって生成されたメタンをこの地下水に
加えた後、注水用の井戸２１から飽和層１２へ注水する
ように構成されている。The bioreactor 25 is formed by growing hydrogen-utilizing methane-producing bacteria in an anaerobic reactor and is installed on the ground. The hydrogen-utilizing methane-producing bacterium used here may be a bacterium that can generate methane by utilizing hydrogen, such as Methanobacteria (Methanobacteria).
Anaerobic methanogens such as methanogens belonging to the genus obacterium and methanococcus belonging to the genus Methanococcus can be used. Hydrogen (H 2 ) generated at the cathode 24 is introduced into the bioreactor 25, and methane is produced by hydrogen-utilizing methane-producing bacteria by using this hydrogen. Further, at least a part of the groundwater pumped from the well 22 for pumping water is introduced into the bioreactor 25, and methane generated by the hydrogen-utilizing methanogen is added to this groundwater, and then from the well 21 for water injection. It is configured to inject water into the saturated layer 12.
【００１３】また揚水用の井戸２２から揚水された地下
水の少なくとも一部に、陽極２３で発生する酸素
（Ｏ2）を加えた後、これを注水用の井戸２１から飽和
層１２へ注水するのが好ましい。この場合、上記バイオ
リアクター２５でメタンが加えられた後の地下水に酸素
を加えてもよく、あるいは揚水された地下水の一部をバ
イオリアクター２５へ導入するとともに、これとは別
に、地下水の一部に酸素やＨ2Ｏ2を加え、これらの地下
水を混合して、あるいは別々に注水用の井戸２１から飽
和層１２へ注水してもよい。Further, after oxygen (O 2 ) generated at the anode 23 is added to at least a part of the groundwater pumped from the well 22 for pumping, this is poured from the well 21 for water injection into the saturated layer 12. Is preferred. In this case, oxygen may be added to the groundwater after methane has been added in the bioreactor 25, or a part of the pumped groundwater may be introduced into the bioreactor 25, and a part of the groundwater may be separated. It is also possible to add oxygen or H 2 O 2 to the above, mix these groundwaters, or separately inject water from the well 21 for water injection into the saturated layer 12.
【００１４】また、揚水用の井戸２２から揚水された地
下水の少なくとも一部に、土壌中に生息している汚染物
質分解菌の生育に必要な、メタンおよび酸素以外の栄養
源を添加した後、これを注水用の井戸２１から飽和層１
２へ注水してもよい。この場合、メタンおよび／または
酸素が加えられた地下水に栄養源を添加してもよく、あ
るいは揚水された地下水の一部をバイオリアクター２５
へ導入するとともに、これとは別に、地下水の一部に栄
養源を添加し、これらの地下水を混合し、あるいは別々
に注水用の井戸２１から飽和層１２へ注水してもよい。
また酸素の添加によって生じる井戸２１の目詰まりを防
止するために、メタンおよび栄養源と、酸素とを、それ
ぞれ別の注水用の井戸を用いて飽和層１２へ供給しても
よい。栄養源としては、例えば窒素源やリン酸塩などの
無機塩類が挙げられる。After adding nutrients other than methane and oxygen necessary for growth of pollutant-degrading bacteria inhabiting the soil to at least a part of the groundwater pumped from the well 22 for pumping, From the water injection well 21 to the saturated layer 1
Water may be poured into 2. In this case, the nutrient source may be added to the groundwater supplemented with methane and / or oxygen, or a part of the pumped groundwater may be added to the bioreactor 25.
Alternatively, a nutrient source may be added to part of the groundwater, the groundwater may be mixed, or water may be separately poured into the saturated layer 12 from the water injection well 21.
Further, in order to prevent the well 21 from being clogged due to the addition of oxygen, methane and a nutrient source and oxygen may be supplied to the saturated layer 12 by using different water injection wells. Examples of the nutrient source include nitrogen sources and inorganic salts such as phosphates.
【００１５】本発明の汚染地下水、土壌の修復方法は、
土壌中に生息する汚染物質分解菌の中でも特にメタン資
化性菌の活性を高めて、トリクロロエチレン等の有機塩
素化合物の分解、除去を行うのに好適に用いられる。す
なわち汚染地下水、土壌の修復を行うには、２つの電極
２３，２４間に電圧を加えつつ、揚水用の井戸２２から
地下水を揚水し、これをバイオリアクター２５へ導入し
た後、再び注水用の井戸２１から飽和層１２へ注水し
て、地下水を循環させる。The method for remediating contaminated groundwater and soil according to the present invention is
It is preferably used for enhancing the activity of methane-utilizing bacteria among pollutant-degrading bacteria that live in soil to decompose and remove organic chlorine compounds such as trichlorethylene. That is, in order to restore contaminated groundwater and soil, groundwater is pumped from the well 22 for pumping while applying a voltage between the two electrodes 23 and 24, and this is introduced into the bioreactor 25, and then again for pouring water. Water is poured from the well 21 to the saturated layer 12 to circulate groundwater.
【００１６】電極２３，２４間に電圧を加えることによ
り水の電気分解が生じ、陰極２４では水素が生成され、
陽極２３では酸素が生成される。この陰極２４で発生し
た水素がバイオリアクター２５に導入されることによ
り、ここでメタンが生成される。このようにして地上の
バイオリアクター２５で生成されたメタンが、循環する
地下水によって飽和層１２に導入されることにより、土
壌中に生息しているメタン資化性菌の活性が高められ
る。メタン資化性菌は、例えばLittle,C.D.ら(Appl. En
viron. Microbiol.,54,951-956(1988))や、Fogel,M.M.
ら(Appl. Environ. Microbiol.,51,720-724(1986))によ
って報告されているように、地下水や土壌中の汚染物質
であるトリクロロエチレンを、好気的に分解することが
知られており、したがってトリクロロエチレンの分解、
除去を効率よく行うことができる。By applying a voltage between the electrodes 23 and 24, electrolysis of water occurs and hydrogen is produced at the cathode 24,
Oxygen is produced at the anode 23. By introducing the hydrogen generated at the cathode 24 into the bioreactor 25, methane is generated here. In this way, the methane generated in the bioreactor 25 on the ground is introduced into the saturated layer 12 by the circulating groundwater, whereby the activity of the methane-utilizing bacteria inhabiting the soil is enhanced. Methane-utilizing bacteria are described in, for example, Little, CD et al. (Appl. En
viron. Microbiol., 54, 951-956 (1988)), Fogel, MM
(Appl. Environ. Microbiol., 51,720-724 (1986)) and is known to aerobically decompose trichlorethylene, a pollutant in groundwater and soil, and Decomposition of trichlorethylene,
The removal can be performed efficiently.
【００１７】また電極２３，２４間に電圧を加えること
により、粘土質や土壌中の有機物に吸着されていたトリ
クロロエチレンが離脱して、地下水流５中に移動するの
で、不飽和層１１に存在するトリクロロエチレンも分
解、除去することができる。さらに、陽極２３で発生し
た酸素、および／または栄養源を循環する地下水によっ
て飽和層１２に導入することにより、土壌中のメタン資
化性菌の活性がさらに高められ、トリクロロエチレンの
分解、除去が促進される。When a voltage is applied between the electrodes 23 and 24, the trichlorethylene adsorbed by the clay and the organic matter in the soil is released and moves into the groundwater flow 5, so that it exists in the unsaturated layer 11. Trichlorethylene can also be decomposed and removed. Further, by introducing oxygen and / or nutrient sources generated in the anode 23 into the saturated layer 12 by circulating groundwater, the activity of methane-utilizing bacteria in the soil is further enhanced, and decomposition and removal of trichlorethylene are promoted. To be done.
【００１８】[0018]
【発明の効果】以上説明したように請求項１に係る発明
によれば、汚染物質で汚染された地下汚染箇所の近傍の
飽和層に２本以上の井戸を掘削し、該地下汚染箇所の近
傍の飽和層に２つ以上の電極を離間して埋設し、水素を
利用してメタンを生成するバイオリアクターを地上に設
けるとともに、前記電極間に電圧を加え、陰極で発生す
る水素を前記バイオリアクターに供給しつつ、地下水流
下流側に位置する井戸から揚水した地下水の少なくとも
一部を前記バイオリアクターに導入し、該バイオリアク
ターで生成されたメタンとともに、前記地下汚染箇所の
地下水流上流側に位置する井戸から飽和層に注水するこ
とにより、飽和層に供給されたメタンによって土壌中に
生息する汚染物質分解菌の活性を高め、土壌の浄化、修
復を促進させることができる。また前記電極間に電圧を
加えることにより、不飽和層の汚染物質を離脱させるこ
とができるので、汚染地下水、土壌の浄化、修復を短時
間で行うことができ、不飽和層の汚染物質の分解除去も
可能である。さらに、電極間に電圧を加えたときに陰極
で発生する水素を利用して、メタンを生成するバイオリ
アクターを作動させることができるので、汚染物質分解
菌の活性を高めるのに必要なメタンを効率的に得ること
ができる。As described above, according to the invention of claim 1, two or more wells are excavated in the saturated layer in the vicinity of the underground contaminated site contaminated with pollutants, and the vicinity of the underground contaminated site is excavated. At least two electrodes are embedded in the saturated layer of the space apart from each other, and a bioreactor for generating methane using hydrogen is provided on the ground, and a voltage is applied between the electrodes to generate hydrogen at the cathode. While supplying at least a part of the groundwater pumped from a well located on the downstream side of the groundwater flow into the bioreactor, along with the methane produced in the bioreactor, located at the groundwater flow upstream side of the underground pollution location By injecting water from the wells into the saturated layer, the methane supplied to the saturated layer enhances the activity of pollutant-degrading bacteria that inhabit the soil and promotes soil purification and restoration. Can. Further, by applying a voltage between the electrodes, the pollutants in the unsaturated layer can be separated, so that the contaminated groundwater and soil can be purified and repaired in a short time, and the pollutants in the unsaturated layer can be decomposed. It can also be removed. In addition, the hydrogen generated at the cathode when a voltage is applied between the electrodes can be used to operate the bioreactor that produces methane, so the methane required to increase the activity of pollutant-degrading bacteria can be efficiently produced. You can get it.
【００１９】請求項２に係る発明によれば、前記井戸か
ら揚水した地下水の少なくとも一部に、上記電極間に電
圧を加えて陽極で発生する酸素を加えた後、飽和層に注
水することにより、土壌中の汚染物質分解菌の活性をさ
らに高めることができる。また、電極で発生する酸素を
利用するので経済的にも有利である。請求項３に係る発
明によれば、前記井戸から揚水した地下水の少なくとも
一部に、土壌中の汚染物質分解菌の栄養源を添加した
後、飽和層に注水することにより、土壌中の汚染物質分
解菌の活性をさらに高めることができる。According to the invention of claim 2, a voltage is applied between the electrodes to add oxygen generated at the anode to at least a part of groundwater pumped from the well, and then water is poured into the saturated layer. The activity of pollutant-degrading bacteria in soil can be further increased. Moreover, since oxygen generated in the electrodes is used, it is economically advantageous. According to the invention of claim 3, a nutrient source for pollutant decomposing bacteria in soil is added to at least a part of groundwater pumped from the well, and then water is poured into the saturated layer to thereby pollutant in soil. The activity of the degrading bacteria can be further enhanced.
【図１】 本発明による汚染地下水、土壌の修復方法の
一例を示す概略構成図である。FIG. 1 is a schematic configuration diagram showing an example of a method for repairing contaminated groundwater and soil according to the present invention.
【図２】 従来の汚染地下水、土壌の修復方法の一例を
示す概略構成図である。FIG. 2 is a schematic configuration diagram showing an example of a conventional method for repairing contaminated groundwater and soil.
１ 地下汚染箇所 ５ 地下水流 １２ 飽和層 ２１，２２ 井戸 ２３ 電極（陽極） ２４ 電極（陰極） ２５ バイオリアクター 1 Underground Pollution Site 5 Groundwater Flow 12 Saturated Layer 21, 22 Well 23 Electrode (Anode) 24 Electrode (Cathode) 25 Bioreactor
Claims (3)
傍の飽和層に２本以上の井戸を掘削し、該地下汚染箇所
の近傍の飽和層に２つ以上の電極を離間して埋設し、水
素を利用してメタンを生成するバイオリアクターを地上
に設けるとともに、前記電極間に電圧を加え、陰極で発
生する水素を前記バイオリアクターに供給しつつ、地下
水流下流側に位置する井戸から揚水した地下水の少なく
とも一部を前記バイオリアクターに導入し、該バイオリ
アクターで生成されたメタンとともに、前記地下汚染箇
所の地下水流上流側に位置する井戸から飽和層に注水す
ることを特徴とする汚染地下水、土壌の修復方法。1. An excavation of two or more wells in a saturated layer in the vicinity of an underground contaminated site contaminated with a pollutant, and burying two or more electrodes apart from each other in the saturated layer in the vicinity of the underground contaminated site. , A bioreactor that produces methane using hydrogen is installed on the ground, and a voltage is applied between the electrodes to supply hydrogen generated at the cathode to the bioreactor while pumping water from a well located downstream of the groundwater flow. At least a part of the groundwater is introduced into the bioreactor, and together with methane produced in the bioreactor, water is injected into a saturated layer from a well located on the upstream side of the groundwater flow at the underground pollution location. , Soil repair methods.
も一部に、前記電極間に電圧を加えて陽極で発生する酸
素を加えた後、飽和層に注水することを特徴とする請求
項１記載の汚染地下水、土壌の修復方法。2. The saturated layer is filled with water after applying a voltage between the electrodes to add oxygen generated at the anode to at least a part of groundwater pumped from the well. How to remediate contaminated groundwater and soil.
も一部に、土壌中の汚染物質分解菌の栄養源を添加した
後、飽和層に注水することを特徴とする請求項１または
２記載の汚染地下水、土壌の修復方法。3. The pollution according to claim 1 or 2, wherein a nutrient source for pollutant-decomposing bacteria in soil is added to at least a part of groundwater pumped from the well, and then water is injected into the saturated layer. Groundwater and soil restoration methods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04336796A JP3374231B2 (en) | 1996-02-29 | 1996-02-29 | How to restore contaminated groundwater and soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04336796A JP3374231B2 (en) | 1996-02-29 | 1996-02-29 | How to restore contaminated groundwater and soil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09234488A true JPH09234488A (en) | 1997-09-09 |
| JP3374231B2 JP3374231B2 (en) | 2003-02-04 |
Family
ID=12661885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04336796A Expired - Fee Related JP3374231B2 (en) | 1996-02-29 | 1996-02-29 | How to restore contaminated groundwater and soil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3374231B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010088497A (en) * | 2001-07-27 | 2001-09-28 | 김수삼 | Injection of nutrients and TEAs for bioremediation by electrical field method |
| JP2014200716A (en) * | 2013-04-02 | 2014-10-27 | 株式会社大林組 | Foundation purification method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5398756A (en) | 1992-12-14 | 1995-03-21 | Monsanto Company | In-situ remediation of contaminated soils |
-
1996
- 1996-02-29 JP JP04336796A patent/JP3374231B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010088497A (en) * | 2001-07-27 | 2001-09-28 | 김수삼 | Injection of nutrients and TEAs for bioremediation by electrical field method |
| JP2014200716A (en) * | 2013-04-02 | 2014-10-27 | 株式会社大林組 | Foundation purification method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3374231B2 (en) | 2003-02-04 |
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