JP5839252B2 - Contaminated groundwater purification structure - Google Patents

Contaminated groundwater purification structure Download PDF

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JP5839252B2
JP5839252B2 JP2010176696A JP2010176696A JP5839252B2 JP 5839252 B2 JP5839252 B2 JP 5839252B2 JP 2010176696 A JP2010176696 A JP 2010176696A JP 2010176696 A JP2010176696 A JP 2010176696A JP 5839252 B2 JP5839252 B2 JP 5839252B2
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陽士 青木
陽士 青木
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Description

本発明は、揮発性有機化合物や重金属等により汚染された土壌又は地下水の浄化構造に関するものである。   The present invention relates to a purification structure for soil or groundwater contaminated with volatile organic compounds or heavy metals.

従来、トリクロロエチレンのような揮発性有機化合物や重金属等で汚染された土壌や地下水を原位置で浄化する方法として、透過性反応壁を用いる方法が知られている。透過性反応壁とは、水に対して透過性を有すると共に、地下水中の汚染物質と反応（不溶化、分解等）する性能を有する構造体である。   Conventionally, a method using a permeable reaction wall is known as a method for purifying soil or groundwater contaminated with a volatile organic compound such as trichlorethylene or heavy metal in situ. The permeable reaction wall is a structure that is permeable to water and has the ability to react (insolubilize, decompose, etc.) with contaminants in groundwater.

図３は、透過性反応壁を用いた従来の浄化方法を示す側断面図である。この浄化方法においては、透過性反応壁３０を、不飽和帯３１から帯水層（飽和帯）３２に渡って、粘土や岩盤からなる不透水層３３に達するように設置する。このとき、透過性反応壁３０は、帯水層（飽和帯）３２を流れる地下水３６の流向に対して略直交するように立設される。それにより、汚染源３４から拡散した汚染物質３５を含む地下水３６が透過性反応壁３０を透過し、その透過の際に、汚染物質３５が透過性反応壁３０と反応することにより無害化又は除去される。   FIG. 3 is a side sectional view showing a conventional purification method using a permeable reaction wall. In this purification method, the permeable reaction wall 30 is installed from the unsaturated zone 31 to the aquifer (saturated zone) 32 so as to reach the impermeable layer 33 made of clay or rock. At this time, the permeable reaction wall 30 is erected so as to be substantially orthogonal to the flow direction of the groundwater 36 flowing through the aquifer (saturation zone) 32. Thereby, the groundwater 36 containing the pollutant 35 diffused from the pollutant source 34 permeates the permeable reaction wall 30, and at the time of the permeation, the pollutant 35 reacts with the permeable reaction wall 30 to be rendered harmless or removed. The

このような浄化方法に関連する技術として、例えば、特許文献１には、地下土壌が汚染された一定の汚染領域に対し、多数本の防護柱を近接させて上記汚染領域を囲むように埋設する汚染拡散防止及び浄化方法が開示されている。上記防護柱は、多数個の貫通孔を設けた管体に濾過材として炭を充填した構造を有しており、汚染領域から地下水等とともに流出する汚染物質を濾過している。また、特許文献２には、透水性を有し、かつ、希土類化合物を担持する汚染拡散防止用の壁体を、汚染土壌と非汚染土壌とを区画するように地中に埋設した汚染拡散防止構造が開示されている。   As a technique related to such a purification method, for example, Patent Document 1 embeds a plurality of protective pillars close to a certain contaminated area in which underground soil is contaminated so as to surround the contaminated area. A pollution diffusion prevention and purification method is disclosed. The protective column has a structure in which a tubular body provided with a large number of through holes is filled with charcoal as a filtering material, and filters out contaminants flowing out of the contaminated area together with groundwater and the like. Further, Patent Document 2 discloses a pollution diffusion prevention in which a pollution diffusion preventing wall having water permeability and carrying a rare earth compound is buried in the ground so as to partition contaminated soil and non-contaminated soil. A structure is disclosed.

特開２０００−１１７２３７号公報JP 2000-117237 A 国際公開第０３／１０３８６６号International Publication No. 03/103866

ところで、上記のような透過性反応壁３０を用いた浄化方法においては、汚染物質３５の濃度や地下水３６の流速等に応じて透過性反応壁３０の厚さを決定し、地盤を不透水層３３まで深く掘削してこの透過性反応壁３０を設置する。また、一旦設置された透過性反応壁３０は、汚染物質３５を含む地下水３６が継続的に通過することにより経時的に劣化又は破過するので、浄化作用を維持するために、透過性反応壁３０を定期的に交換することが望ましい。しかしながら、上記の通り透過性反応壁３０は地中深くに設置されるため、透過性反応壁３０の交換は非常に困難であり、多くのコストを要する。   By the way, in the purification method using the permeable reaction wall 30 as described above, the thickness of the permeable reaction wall 30 is determined according to the concentration of the pollutant 35, the flow velocity of the groundwater 36, etc. The permeable reaction wall 30 is installed by excavating deeply to 33. Moreover, since the permeable reaction wall 30 once installed deteriorates or breaks down with passage of the groundwater 36 containing the pollutant 35 continuously, the permeable reaction wall 30 is maintained in order to maintain the purification action. It is desirable to replace 30 regularly. However, since the permeable reaction wall 30 is installed deep in the ground as described above, the exchange of the permeable reaction wall 30 is very difficult and requires a lot of cost.

本発明は、上記に鑑みてなされたものであって、透過性反応壁を容易に交換することができる汚染地下水の浄化構造を提供することを目的とする。   This invention is made | formed in view of the above, Comprising: It aims at providing the purification structure of the contaminated groundwater which can replace | exchange a permeable reaction wall easily.

上記課題を解決するために、本発明に係る汚染地下水の浄化構造は、汚染地下水を原位置で浄化する浄化構造であり、帯水層の深部を流れる地下水を該帯水層の浅部に導く流路を形成する流路形成部材と、地下水面近傍に設置され、前記流路形成部材によって浅部に導かれた前記地下水を透過させることにより、前記地下水に含まれる汚染物質と反応して前記地下水を浄化する透過性反応壁とを備えることを特徴とする。   In order to solve the above problems, a contaminated groundwater purification structure according to the present invention is a purification structure that purifies contaminated groundwater in situ, and guides groundwater flowing deep in the aquifer to the shallow part of the aquifer. A flow path forming member that forms a flow path, and the ground water surface that is installed in the vicinity of the ground water surface and that is guided to a shallow portion by the flow path forming member, thereby reacting with a contaminant contained in the ground water, and A permeable reaction wall for purifying groundwater is provided.

上記汚染地下水の浄化構造において、前記流路形成部材は、地表から前記地下水の底部より高い高さまでの領域に設置された第１の壁部材と、前記第１の壁部材の下流側の該第１の壁部材から所定の距離だけ隔てた領域であって、前記地下水の底部から前記地下水面より低い高さまでの領域に設置された第２の壁部材とを備え、前記透過性反応壁は、前記第２の壁部材の少なくとも上方の領域に設けられることを特徴とする。   In the contaminated groundwater purification structure, the flow path forming member includes a first wall member installed in a region from the ground surface to a height higher than a bottom of the groundwater, and the first wall member downstream of the first wall member. A second wall member installed in a region separated by a predetermined distance from the wall member of 1 and from a bottom of the groundwater to a height lower than the groundwater surface, the permeable reaction wall, It is provided in at least an upper region of the second wall member.

上記汚染地下水の浄化構造において、前記第１の壁部材は、前記地表から前記深度まで打設された鋼矢板であり、前記第２の壁部材は、前記地下水の底部である不透水層上に設置された地中壁であることを特徴とする。   In the contaminated groundwater purification structure, the first wall member is a steel sheet pile placed from the ground surface to the depth, and the second wall member is on an impermeable layer that is a bottom of the ground water. It is an underground wall installed.

上記汚染地下水の浄化構造において、前記透過性反応壁は、該透過性反応壁の主面が略水平となるように設置されていることを特徴とする。   The contaminated groundwater purification structure is characterized in that the permeable reaction wall is installed such that a main surface of the permeable reaction wall is substantially horizontal.

上記汚染地下水の浄化構造において、前記透過性反応壁は、重金属を不溶化させる性能を有する第１の透過性反応壁材と、該第１の透過性反応壁材の上流側又は下流側に配置され、揮発性有機化合物を分解する性能を有する第２の透過性反応壁材とを有することを特徴とする。   In the contaminated groundwater purification structure, the permeable reaction wall is disposed on the upstream side or the downstream side of the first permeable reaction wall material having the ability to insolubilize heavy metals and the first permeable reaction wall material. And a second permeable reaction wall material having the ability to decompose volatile organic compounds.

本発明によれば、流路形成部材によって深部の地下水を浅部に導く水流を形成するので、透過性反応壁を地下水面近傍に配置することができる。従って、透過性反応壁が劣化した際に、容易に新たな透過性反応壁と交換することが可能となる。   According to the present invention, since the water flow that guides the deep groundwater to the shallow part is formed by the flow path forming member, the permeable reaction wall can be disposed in the vicinity of the groundwater surface. Therefore, when the permeable reaction wall deteriorates, it can be easily replaced with a new permeable reaction wall.

図１は、本発明の一実施の形態に係る汚染地下水の浄化構造を示す側断面図である。FIG. 1 is a side sectional view showing a contaminated groundwater purification structure according to an embodiment of the present invention. 図２は、図１のＡ−Ａ断面図である。FIG. 2 is a cross-sectional view taken along the line AA of FIG. 図３は、従来の汚染地下水の浄化方法を示す側断面図である。FIG. 3 is a side sectional view showing a conventional method for purifying contaminated groundwater.

以下に、本発明に係る汚染地下水の浄化構造の実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態により本発明が限定されるものではない。   Embodiments of a contaminated groundwater purification structure according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment.

図１は、本発明の一実施の形態に係る汚染地下水の浄化構造（以下、単に「浄化構造」という。）を示す側断面図である。また、図２は、図１のＡ−Ａ断面図である。図１及び図２に示す浄化構造１０は、不飽和帯１と不透水層３との間に存在する帯水層（飽和帯）２を流れる地下水６を原位置で浄化する浄化構造である。この浄化構造１０は、揮発性有機化合物や重金属等を含む汚染物質５を拡散する汚染源４よりも下流側に設置される。   FIG. 1 is a side sectional view showing a contaminated groundwater purification structure (hereinafter simply referred to as “purification structure”) according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA in FIG. A purification structure 10 shown in FIGS. 1 and 2 is a purification structure that purifies groundwater 6 flowing in an aquifer (saturation zone) 2 existing between the unsaturated zone 1 and the impermeable layer 3 in its original position. The purification structure 10 is installed on the downstream side of the pollution source 4 that diffuses the pollutant 5 including volatile organic compounds and heavy metals.

浄化構造１０は、鋼矢板１１と、地中壁１２と、水平型透過性反応壁１３とを備えている。この内の鋼矢板１１及び地中壁１２は、帯水層２の深部を流れる地下水６を、該帯水層２の浅部に導く流路を形成する流路形成部材を構成する。   The purification structure 10 includes a steel sheet pile 11, an underground wall 12, and a horizontal permeable reaction wall 13. Of these, the steel sheet pile 11 and the underground wall 12 constitute a flow path forming member that forms a flow path for guiding the groundwater 6 flowing in the deep part of the aquifer 2 to the shallow part of the aquifer 2.

鋼矢板１１は、汚染地下水の浄化地点である水平型透過性反応壁１３の上流側に、地表１ａから地下水６の底部（即ち、不透水層３の表面）より高い高さ（即ち、地表１ａからの深度Ｄ）までの領域に打設された壁部材であり、地下水面２ａから深度Ｄまでの領域において地下水６の流通を遮蔽する。好ましくは、鋼矢板１１の主面を、地下水６の流向と略直交するように設置すると良い。   The steel sheet pile 11 is located on the upstream side of the horizontal permeable reaction wall 13 that is a purification point of contaminated groundwater, and is higher than the bottom of the groundwater 6 (that is, the surface of the impermeable layer 3) from the ground surface 1a (that is, the ground surface 1a). From the groundwater surface 2a to the depth D, and the flow of the groundwater 6 is shielded. Preferably, the main surface of the steel sheet pile 11 is installed so as to be substantially orthogonal to the flow direction of the groundwater 6.

地中壁１２は、鋼矢板１１の下流側の領域であって鋼矢板１１から所定の距離だけ隔てた領域に設置されている。地中壁１２は、地下水６の底部から地下水面２ａより低い高さＨまでの領域に設置された壁部材であり、鋼矢板１１の下方を通過した地下水６の流通を遮蔽することにより、地下水６の流向を自身に沿って上方に変化させる。地中壁１２は、例えば、セメント系深層混合処理（ＣＤＭ）工法等の地盤改良杭の設置工法により、不透水層３上に設置される。また、好ましくは、地中壁１２の主面も、地下水６の流向と略直交するように（即ち、鋼矢板１１の主面と略平行に）設置すると良い。   The underground wall 12 is a region on the downstream side of the steel sheet pile 11 and is installed in a region separated from the steel sheet pile 11 by a predetermined distance. The underground wall 12 is a wall member installed in a region from the bottom of the groundwater 6 to a height H lower than the groundwater surface 2a. By shielding the flow of the groundwater 6 that has passed below the steel sheet pile 11, the underground water The flow direction of 6 is changed upward along itself. The underground wall 12 is installed on the impermeable layer 3 by, for example, a ground improvement pile installation method such as a cement-based deep mixing (CDM) method. Preferably, the main surface of the underground wall 12 is also installed so as to be substantially orthogonal to the flow direction of the groundwater 6 (that is, substantially parallel to the main surface of the steel sheet pile 11).

水平型透過性反応壁１３は、水を透過させる性質を有すると共に、所定の汚染物質に対して反応（不溶化、分解等）する性質を有する構造体である。水平型透過性反応壁１３は、地下水面２ａの近傍に設置されており、鋼矢板１１と地中壁１２とによって浅部に導かれた地下水６を透過させることにより、地下水６を浄化する。本実施の形態において、水平型透過性反応壁１３は、一端が地中壁１２上に載置され、自身の上面が地下水面２ａを超えるように設置されている。それにより、地下水面２ａと地中壁１２との間の領域に流れ込む地下水６が、確実に水平型透過性反応壁１３に導入される。また、好ましくは、水平型透過性反応壁１３を、その主面が略水平になるように設置すると良い。   The horizontal permeable reaction wall 13 is a structure having a property of allowing water to permeate and a property of reacting (insolubilizing, decomposing, etc.) with a predetermined contaminant. The horizontal permeable reaction wall 13 is installed in the vicinity of the groundwater surface 2a, and purifies the groundwater 6 by transmitting the groundwater 6 guided to the shallow portion by the steel sheet pile 11 and the underground wall 12. In the present embodiment, the horizontal permeable reaction wall 13 is placed such that one end is placed on the underground wall 12 and its upper surface exceeds the groundwater surface 2a. As a result, the groundwater 6 flowing into the region between the groundwater surface 2 a and the underground wall 12 is reliably introduced into the horizontal permeable reaction wall 13. Preferably, the horizontal permeable reaction wall 13 is installed so that its main surface is substantially horizontal.

本実施の形態において、水平型透過性反応壁１３は、鉛や水銀や砒素等の重金属と反応して不溶化させる性能を有する第１透過性反応壁材（以下、第１反応壁材）１３ａと、トリクロロエチレン等の揮発性有機化合物と反応して分解させる性能を有する第２透過性反応壁材（以下、第２反応壁材）１３ｂとを含んでいる。これらの第１反応壁材１３ａ及び第２反応壁材１３ｂは、地下水６の流向に沿って上流側から下流側に順に並べられている。なお、図１及び図２において、第１反応壁材１３ａが上流側に配置され、第２反応壁材１３ｂが下流側に配置されているが、配置順はその逆であっても良い。   In the present embodiment, the horizontal permeable reaction wall 13 includes a first permeable reaction wall material (hereinafter referred to as a first reaction wall material) 13a having a capability of reacting with a heavy metal such as lead, mercury, and arsenic to insolubilize it. And a second permeable reaction wall material (hereinafter referred to as second reaction wall material) 13b having the ability to react with volatile organic compounds such as trichlorethylene and decompose. The first reaction wall material 13 a and the second reaction wall material 13 b are arranged in order from the upstream side to the downstream side along the flow direction of the groundwater 6. 1 and 2, the first reaction wall member 13a is arranged on the upstream side and the second reaction wall member 13b is arranged on the downstream side, but the arrangement order may be reversed.

次に、浄化構造１０の作用について説明する。
図１に示すように、鋼矢板１１の底面が地中壁１２の上面よりも低くなるように設置すると、鋼矢板１１と地中壁１２との間に、帯水層２の深部から浅部に向けて上昇する地下水６の流れが形成される。ここで、帯水層２の深部には、汚染プルームと呼ばれる高濃度の汚染物質５が存在しており、この汚染プルームも、鋼矢板１１及び地中壁１２によって形成された地下水６の流れに乗って浅部に運ばれる。汚染物質５を含む地下水６は、地下水面２ａ近傍に設置された水平型透過性反応壁１３を透過する。その際に、汚染物質５は、第１反応壁材１３ａ及び第２反応壁材１３ｂを順次通過して無毒化又は除去される。 Next, the operation of the purification structure 10 will be described.
As shown in FIG. 1, when the steel sheet pile 11 is installed so that the bottom surface is lower than the top surface of the underground wall 12, between the steel sheet pile 11 and the underground wall 12, the deep part of the aquifer 2 is shallow. A flow of the groundwater 6 rising toward is formed. Here, in the deep part of the aquifer 2, there is a high-concentration pollutant 5 called a polluted plume, and this polluted plume also flows into the flow of groundwater 6 formed by the steel sheet pile 11 and the underground wall 12. Take it to the shallow area. The groundwater 6 containing the pollutant 5 passes through the horizontal permeable reaction wall 13 installed in the vicinity of the groundwater surface 2a. At that time, the pollutant 5 passes through the first reaction wall material 13a and the second reaction wall material 13b in sequence and is detoxified or removed.

以上説明したように、本実施の形態によれば、鋼矢板及び地中壁を設けることにより深部の地下水を浅部に導く水流を形成するので、透過性反応壁による浄化を地下水面近傍において行うことができる。従って、透過性反応壁が劣化した際に、新たな透過性反応壁と容易に交換することができる。特に、本実施の形態のように透過性反応壁を略水平に配置する場合には、深さ方向の掘削量が少量となるため、透過性反応壁の交換はさらに容易となる。また、汚染物質の濃度等に応じた透過性反応壁の厚さの変更（地下水の流向に沿った方向の長さ）も簡単に行うことができる。或いは、透過性反応壁の劣化の速度が部分ごとに不均一である場合には、劣化状態に応じて透過性反応壁を部分的に交換することも可能である。   As described above, according to the present embodiment, by providing the steel sheet pile and the underground wall, a water flow that leads the deep underground water to the shallow portion is formed, so purification by the permeable reaction wall is performed in the vicinity of the underground water surface. be able to. Therefore, when the permeable reaction wall deteriorates, it can be easily replaced with a new permeable reaction wall. In particular, when the permeable reaction wall is arranged substantially horizontally as in the present embodiment, since the amount of excavation in the depth direction is small, the exchange of the permeable reaction wall is further facilitated. Moreover, the change of the thickness of the permeable reaction wall according to the concentration of the pollutant (the length in the direction along the flow direction of the groundwater) can be easily performed. Alternatively, when the rate of deterioration of the permeable reaction wall is non-uniform for each part, it is also possible to partially exchange the permeable reaction wall according to the deterioration state.

また、本実施の形態によれば、高濃度の汚染プルームを地下水の浅部に導いて浄化するので、浄化効率を向上することが可能となる。   Moreover, according to this Embodiment, since a high concentration contaminated plume is guided and purified to the shallow part of groundwater, it becomes possible to improve purification efficiency.

さらに、本実施の形態によれば、互いに異なる性能を有する２種類の透過性反応壁を並べて地下水を順次透過させるので、汚染物質である重金属等と揮発性有機化合物との両方を同時に浄化することが可能となる。また、２種類の透過性反応壁の劣化速度が異なる場合には、必要に応じて、いずれか一方のみを交換することも可能である。   Furthermore, according to the present embodiment, two kinds of permeable reaction walls having different performance are arranged side by side, and the groundwater is sequentially permeated, so that both heavy metals, which are pollutants, and volatile organic compounds are simultaneously purified. Is possible. Further, when the deterioration rates of the two types of permeable reaction walls are different, only one of them can be exchanged as necessary.

以上説明した本実施の形態においては、鋼矢板及び地中壁を設けることにより、深部の地下水を浅部に導く水流を形成したが、このような水流を形成することができれば、鋼矢板及び地中壁を用いる構成に限定されない。   In the present embodiment described above, by providing the steel sheet pile and the underground wall, a water flow that leads the deep underground water to the shallow portion is formed. However, if such a water flow can be formed, the steel sheet pile and the ground It is not limited to the configuration using the inner wall.

また、上記実施の形態においては、２種類の透過性反応壁によって水平型透過性反応壁を構成したが、汚染物質の種類に応じて、いずれかの１つのみを用いても良いし、別の種類の透過性反応壁をさらに追加しても良い。   In the above embodiment, the horizontal type permeable reaction wall is constituted by two types of permeable reaction walls. However, only one of them may be used depending on the type of contaminants. This kind of permeable reaction wall may be further added.

さらに、上記実施の形態においては、図１に示すように、水平型透過性反応壁１３の一端を地中壁１２上に載置することにより水平型透過性反応壁１３を支持しているが、水平型透過性反応壁１３を支持する支持柱等を別途不透水層３に設置しても良い。この場合、地中壁１２の上部を通過した地下水６が確実に水平型透過性反応壁１３に導入されれば、水平型透過性反応壁１３の一端を必ずしも地中壁１２上に載置する必要はない。例えば、水平型透過性反応壁１３の左端面の下端部と地中壁１２の右端面の上端部とが当接するように、各部材の配置を決定しても良い。   Furthermore, in the above embodiment, as shown in FIG. 1, the horizontal permeable reaction wall 13 is supported by placing one end of the horizontal permeable reaction wall 13 on the underground wall 12. Further, a support column or the like that supports the horizontal permeable reaction wall 13 may be separately installed in the impermeable layer 3. In this case, if the groundwater 6 that has passed through the upper part of the underground wall 12 is reliably introduced into the horizontal permeable reaction wall 13, one end of the horizontal permeable reaction wall 13 is not necessarily placed on the underground wall 12. There is no need. For example, the arrangement of the members may be determined so that the lower end portion of the left end surface of the horizontal permeable reaction wall 13 and the upper end portion of the right end surface of the underground wall 12 abut.

本発明に係る汚染地下水の浄化構造は、汚染地下水を原位置で浄化する場合に有用であり、特に汚染プルームが深部に存在する地下水を浄化する場合に有用である。   The contaminated groundwater purification structure according to the present invention is useful when purifying contaminated groundwater in situ, and is particularly useful when purifying groundwater in which a contaminated plume exists deep.

１、３１ 不飽和帯
１ａ 地表
２ａ 地下水面
２、３２ 帯水層（飽和帯）
３、３３ 不透水層
４、３４ 汚染源
５、３５ 汚染物質
７、３７ 地下水
１０ 浄化構造
１１ 鋼矢板
１２ 地中壁
１３ 水平型透過性反応壁
１３ａ 第１透過性反応壁材（第１反応壁材）
１３ｂ 第２透過性反応壁材（第２反応壁材）
３０ 透過性反応壁
３２ａ 地下水位 1, 31 Unsaturated zone 1a Ground surface 2a Groundwater surface 2, 32 Aquifer (saturated zone)
3, 33 Impervious layer 4, 34 Pollution source 5, 35 Pollutant 7, 37 Groundwater 10 Purification structure 11 Steel sheet pile 12 Underground wall 13 Horizontal permeable reaction wall 13a First permeable reaction wall material (first reaction wall material) )
13b Second permeable reaction wall material (second reaction wall material)
30 Permeable reaction wall 32a Groundwater level

Claims (4)

不飽和帯と不透水層との間に存在する飽和帯である帯水層を流れる汚染地下水を原位置で浄化する浄化構造であり、
前記帯水層の深部を流れる地下水を該帯水層の浅部に導く流路を形成する流路形成部材と、
地下水面近傍に設置され、前記流路形成部材によって浅部に導かれた前記地下水を透過させることにより、前記地下水に含まれる汚染物質と反応して前記地下水を浄化する透過性反応壁と、
を備え、
前記流路形成部材は、地表から前記帯水層の底部である前記不透水層の表面より高い高さまでの領域に設置された第１の壁部材と、前記第１の壁部材から下流側に所定の距離だけ隔てた領域であって、前記帯水層の底部である前記不透水層の表面から前記地下水面より低い高さまでの領域に設置された第２の壁部材とからなり、
前記第１の壁部材の底面は、前記第２の壁部材の上面よりも低くなるように設置されており、
前記透過性反応壁は、水平に配置された水平型透過性反応壁であり、前記第２の壁部材の少なくとも上方の領域に設けられることを特徴とする汚染地下水の浄化構造。 It is a purification structure that purifies contaminated groundwater flowing through the aquifer, which is a saturated zone that exists between the unsaturated zone and the impermeable layer ,
A flow path forming member for forming a flow path for guiding the ground water flowing deep of the aquifer to the shallow portion of the belt-water layer,
A permeable reaction wall that is installed in the vicinity of the groundwater surface and permeates the groundwater guided to the shallow portion by the flow path forming member, thereby purifying the groundwater by reacting with contaminants contained in the groundwater;
With
The flow path forming member includes a first wall member installed in a region from the ground surface to a height higher than the surface of the impermeable layer, which is the bottom of the aquifer, and downstream from the first wall member. A region separated by a predetermined distance, comprising a second wall member installed in a region from the surface of the impermeable layer which is the bottom of the aquifer to a height lower than the groundwater surface,
The bottom surface of the first wall member is installed to be lower than the top surface of the second wall member,
The permeable reactive walls, Ri horizontally disposed horizontal permeable reactive wall der, washed structure contaminated groundwater, wherein Rukoto provided at least above the region of the second wall member. 前記第１の壁部材は、前記地表から前記高さまで打設された鋼矢板であり、
前記第２の壁部材は、前記帯水層の底部である不透水層上に設置された地中壁であることを特徴とする請求項１に記載の汚染地下水の浄化構造。 The first wall member is a steel sheet pile driven from the ground surface to the height ,
2. The contaminated groundwater purification structure according to claim 1 , wherein the second wall member is an underground wall installed on an impermeable layer which is a bottom of the aquifer . 前記透過性反応壁は、該透過性反応壁の主面が略水平となるように設置されていることを特徴とする請求項１または２に記載の汚染地下水の浄化構造。 The contaminated groundwater purification structure according to claim 1 or 2 , wherein the permeable reaction wall is installed such that a main surface of the permeable reaction wall is substantially horizontal. 前記透過性反応壁は、
重金属を不溶化させる性能を有する第１の透過性反応壁材と、
該第１の透過性反応壁材の上流側又は下流側に配置され、揮発性有機化合物を分解する性能を有する第２の透過性反応壁材と、
を有することを特徴とする請求項１〜３のいずれか１項に記載の汚染地下水の浄化構造。 The permeable reaction wall is
A first permeable reaction wall material having the ability to insolubilize heavy metals;
A second permeable reaction wall material disposed on the upstream side or the downstream side of the first permeable reaction wall material and having the ability to decompose volatile organic compounds;
The structure for purifying contaminated groundwater according to any one of claims 1 to 3 , wherein:
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