JP7268572B2 - SOIL CLEANING DEVICE AND SOIL CLEANING METHOD - Google Patents

SOIL CLEANING DEVICE AND SOIL CLEANING METHOD Download PDF

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JP7268572B2
JP7268572B2 JP2019189272A JP2019189272A JP7268572B2 JP 7268572 B2 JP7268572 B2 JP 7268572B2 JP 2019189272 A JP2019189272 A JP 2019189272A JP 2019189272 A JP2019189272 A JP 2019189272A JP 7268572 B2 JP7268572 B2 JP 7268572B2
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soil
electrode
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soil remediation
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俊彦 三重野
昌昭 大田
哲夫 長曽
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Shimadzu Corp
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Description

この発明は、土壌浄化装置および土壌浄化方法に関する。 The present invention relates to a soil purification device and a soil purification method.

汚染された土壌を浄化する方法の一つとして、電気加温法がある。電気加温法は、電気エネルギーによって土壌を加温することにより、土壌から汚染物質を脱離させて浄化を行うものである。 One of the methods for cleaning contaminated soil is the electric heating method. The electric heating method desorbs contaminants from the soil and purifies the soil by heating the soil with electrical energy.

電気加温法により土壌を浄化する土壌浄化装置においては、複数の電極を浄化対象となる土壌中に埋設し、電極間に電圧を印加してそれらの間の土壌に電流を流すことで、土壌の電気抵抗によりジュール熱を発生させて加温する（特許文献１参照）。土壌の温度が上昇すると、土壌粒子に吸着しているテトラクロロエチレン、トリクロロエチレン、ジクロロエチレン、トリクロロエタン等のＶＯＣ（Ｖｏｌａｔｉｌｅ Ｏｒｇａｎｉｃ Ｃｏｍｐｏｕｎｄｓ／揮発性有機化合物）が土壌から脱離して地下水中に溶出する。この地下水を地上に汲み上げる揚水処理や、地下水からガス化したＶＯＣを含む地下ガスを吸引するガス吸引処理等を行うことで、ＶＯＣを土壌から除去して土壌の汚染を浄化することが可能となる。 In a soil purification device that purifies soil by an electric heating method, a plurality of electrodes are embedded in the soil to be purified, and a voltage is applied between the electrodes to cause an electric current to flow through the soil between them, thereby purifying the soil. Joule heat is generated by the electrical resistance of to heat (see Patent Document 1). When the soil temperature rises, VOCs (Volatile Organic Compounds) such as tetrachlorethylene, trichlorethylene, dichloroethylene, and trichloroethane adsorbed to soil particles are desorbed from the soil and eluted into groundwater. It is possible to remove VOCs from the soil and purify soil contamination by performing pumping treatment for pumping up this groundwater to the ground and gas suction treatment for sucking underground gas containing VOC gasified from groundwater. .

特開２０１５－１１２５５６号公報JP 2015-112556 A

このような電気加温法を利用して土壌の浄化を行う場合においては、土壌を掘削、搬出して浄化する方法と比較してコストが低く、また、薬剤注入では浄化が困難な難透水性土壌においても浄化が可能であるという利点がある。しかしながら、汚染土壌の上に比較的大きな建築物等が存在する場合には、効率的に土壌を加温することができない場合がある。 In the case of purifying the soil using such an electric heating method, the cost is lower than the method of excavating and carrying out the soil to purify it. There is an advantage that purification is possible even in the soil. However, when a relatively large building or the like exists on the contaminated soil, it may not be possible to heat the soil efficiently.

図１０は、工場建屋の下にある汚染土壌を従来の手法により浄化する場合の棒状電極１０の配置を示す説明図である。なお、図１０においては、上部に平面図を示し、下部に縦断面図を示している。 FIG. 10 is an explanatory diagram showing the arrangement of the rod-like electrodes 10 when the contaminated soil under the factory building is purified by the conventional method. In addition, in FIG. 10, a plan view is shown in the upper part, and a longitudinal sectional view is shown in the lower part.

汚染土壌の上に工場建屋１０１が存在する場合に、従来の手法で土壌を加温するためには、工場建屋の周囲に複数の棒状電極１０を埋設する必要がある。この時の複数の棒状電極１０の配置は、土壌の比抵抗値や比熱容量を考慮して、土壌を目標温度まで加温し得るように設計されるが、一般的には、棒状電極１０の間隔は、２メートルから６メートルに設定されることが多い。棒状電極１０間の距離がこれより大きなものとなると、土壌が目標温度となるまでに長い時間を要し、土壌を効果的に浄化することができない。 When a factory building 101 exists on contaminated soil, it is necessary to bury a plurality of rod-shaped electrodes 10 around the factory building in order to heat the soil using the conventional method. The arrangement of the plurality of rod-shaped electrodes 10 at this time is designed in consideration of the specific resistance value and specific heat capacity of the soil so that the soil can be heated to the target temperature. Spacing is often set at 2 to 6 meters. If the distance between the rod-shaped electrodes 10 is larger than this, it takes a long time for the soil to reach the target temperature, and the soil cannot be purified effectively.

しかしながら、図１０に示すように、工場建屋１０１が、例えば、一辺が２０メートルの矩形状であった場合には、工場建屋１０１の近傍１メートルの距離に棒状電極１０を４メートル間隔で埋設したとしても、工場建屋１０１を挟む位置に配置される棒状電極１０間の距離は２２メートルとなる。このように、棒状電極１０間の距離が大きな距離となった場合には、工場建屋１０１の下方の汚染土壌を加温するには極めて長い時間が必要となり、実質的には土壌を浄化することが不可能となる。 However, as shown in FIG. 10, when the factory building 101 has a rectangular shape with one side of 20 meters, for example, the rod-shaped electrodes 10 are buried at a distance of 1 meter in the vicinity of the factory building 101 at intervals of 4 meters. Even so, the distance between the rod-like electrodes 10 arranged on both sides of the factory building 101 is 22 meters. Thus, when the distance between the rod-shaped electrodes 10 becomes large, it takes an extremely long time to heat the contaminated soil below the factory building 101, and it is practically impossible to purify the soil. becomes impossible.

この発明は上記課題を解決するためになされたものであり、汚染土壌の上部に建築物等が存在する場合においても、建築物等の下方の汚染土壌を効率的に浄化することが可能な土壌浄化装置および土壌浄化方法を提供することを目的とする。 This invention has been made to solve the above problems, and even if there is a building, etc. above the contaminated soil, the soil that can efficiently purify the contaminated soil below the building, etc. An object of the present invention is to provide a purification device and a soil purification method.

この発明の第１の態様は、電気加温法による土壌加温装置を備えた土壌浄化装置であって、前記土壌加温装置は、板状の導電部材より構成され、土壌中に互いに対向する状態で挿入された第１、第２電極と、前記第１、第２電極の間に電位差を印加する電源と、を備える。 A first aspect of the present invention is a soil remediation apparatus equipped with a soil warming device based on an electric heating method, wherein the soil warming device is composed of plate-like conductive members and faces each other in the soil. and a power source for applying a potential difference between the first and second electrodes.

この発明の第１の態様によれば、板状の導電部材より構成され土壌中に互いに対向する状態で挿入された第１、第２電極の作用により、汚染土壌の上部に建築物等が存在する場合においても、建築物等の下方の汚染土壌を効率的に浄化することが可能となる。そして、第１、第２電極が板状をなすことから、土壌から離脱した汚染物質の外部への漏洩を抑制することが可能となる。 According to the first aspect of the present invention, a building or the like exists above the contaminated soil by the action of the first and second electrodes which are composed of a plate-shaped conductive member and are inserted into the soil in a state facing each other. Even in this case, it is possible to efficiently purify the contaminated soil below the building or the like. Since the first and second electrodes are plate-shaped, it is possible to suppress the leakage of contaminants separated from the soil to the outside.

この発明の実施形態に係る土壌浄化装置の概要を示す斜視図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the outline|summary of the soil purification apparatus which concerns on embodiment of this invention. この発明の実施形態に係る土壌浄化装置における土壌加温装置の設置状態を示す概要図である。It is a schematic diagram which shows the installation state of the soil warming apparatus in the soil purification apparatus which concerns on embodiment of this invention. 第１電極１１を構成する鋼矢板の斜視図である。FIG. 2 is a perspective view of a steel sheet pile forming a first electrode 11; 土壌の温度の推移を示すグラフである。It is a graph which shows transition of the temperature of soil. 図２に示す第１電極１１と第２電極１２との間の電極間電位差を示すグラフである。3 is a graph showing an inter-electrode potential difference between a first electrode 11 and a second electrode 12 shown in FIG. 2. FIG. 図１０に示す工場建屋１０１を介した棒状電極１０間の電極間電位差を示すグラフである。11 is a graph showing the inter-electrode potential difference between the rod-shaped electrodes 10 through the factory building 101 shown in FIG. 10. FIG. この発明の実施形態に係る土壌浄化装置の変形例における土壌加温装置の設置状態を示す概要図である。It is a schematic diagram which shows the installation state of the soil warming apparatus in the modification of the soil purification apparatus which concerns on embodiment of this invention. この発明の実施形態に係る土壌浄化装置の他の変形例における土壌加温装置の設置状態を示す概要図である。It is a schematic diagram which shows the installation state of the soil warming apparatus in the other modification of the soil purification apparatus which concerns on embodiment of this invention. この発明の実施形態に係る土壌浄化装置のさらに他の変形例における土壌加温装置の設置状態を示す概要図である。It is a schematic diagram which shows the installation state of the soil warming apparatus in the further modification of the soil purification apparatus which concerns on embodiment of this invention. 工場建屋の下にある汚染土壌を従来の手法により浄化する場合の棒状電極１０の配置を示す説明図である。FIG. 4 is an explanatory diagram showing the arrangement of rod-shaped electrodes 10 when the contaminated soil under the factory building is purified by a conventional method;

以下、この発明の実施の形態を図面に基づいて説明する。図１は、この発明の実施形態に係る土壌浄化装置の概要を示す斜視図である。また、図２は、この発明の実施形態に係る土壌浄化装置における土壌加温装置の設置状態を示す概要図である。なお、図２においては、上部に平面図を示し、下部に縦断面図を示している。 BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an outline of a soil purification apparatus according to an embodiment of this invention. Moreover, FIG. 2 is a schematic diagram showing the installation state of the soil warming device in the soil purification device according to the embodiment of the present invention. In addition, in FIG. 2, a plan view is shown in the upper part, and a longitudinal sectional view is shown in the lower part.

この発明の実施形態に係る土壌浄化装置は、板状の導電性部材より構成される第１電極１１および第２電極１２と、これらの第１電極１１および第２電極１２に単相交流電流を供給することにより第１電極１１および第２電極１２の間に電位差を印加する単相交流電源２１とを有する加温装置を備える。また、この実施形態に係る土壌浄化装置は、加温装置により加温された土壌の領域から、ガスおよび地下水の少なくとも一方を吸引除去するための多孔状の吸引管３１と、この吸引管３１から管路３３を介して吸引されたガスまたは地下水を排出するための吸引除去部３２とを備える。 The soil remediation apparatus according to the embodiment of the present invention includes a first electrode 11 and a second electrode 12 made of plate-like conductive members, and a single-phase alternating current applied to the first electrode 11 and the second electrode 12. and a single-phase alternating current power supply 21 that supplies a potential difference between the first electrode 11 and the second electrode 12 . Further, the soil purification apparatus according to this embodiment includes a porous suction pipe 31 for sucking and removing at least one of gas and groundwater from the area of the soil heated by the heating device, and from the suction pipe 31 a suction removal section 32 for discharging the gas or ground water sucked through the conduit 33;

この実施形態に係る土壌浄化装置は、工場建屋１０１が既に建築されている場合において、工場建屋１０１の下方の汚染土壌を浄化するために使用されるものである。第１電極１１および第２電極１２は、図２に示すように、矩形状を成す工場建屋１０１における互いに対向する一対の面に沿って、土壌中に埋設される。すなわち、第１電極１１および第２電極１２は、加温対象となる土壌上に建設された工場建屋１０１の周囲の少なくとも一部を囲うように埋設される。この実施形態においては、矩形状を成す工場建屋の一辺は２０メートルである。これに対して、板状の第１電極１１および第２電極１２は、工場建屋１０１の側壁から１メートル離隔した位置に埋設され、幅が約２０メートルで、土壌中に１２メートルの深さに至る大きさを有する。 The soil purification apparatus according to this embodiment is used to purify the contaminated soil under the factory building 101 when the factory building 101 has already been constructed. The first electrode 11 and the second electrode 12 are, as shown in FIG. 2, buried in the soil along a pair of surfaces facing each other in the rectangular factory building 101 . That is, the first electrode 11 and the second electrode 12 are buried so as to surround at least a part of the factory building 101 constructed on the soil to be heated. In this embodiment, one side of the rectangular factory building is 20 meters. On the other hand, the plate-shaped first electrode 11 and the second electrode 12 are buried at a position separated by 1 meter from the side wall of the factory building 101, have a width of about 20 meters, and a depth of 12 meters in the soil. It has a large size.

図３は、第１電極１１を構成する鋼矢板の斜視図である。なお、第２電極１２も、この第１電極１１と同様の構成を有する。 FIG. 3 is a perspective view of a steel sheet pile forming the first electrode 11. FIG. It should be noted that the second electrode 12 also has a configuration similar to that of the first electrode 11 .

第１電極１１は、図３に示すような鋼矢板から構成される。鋼矢板は、シートパイルとも呼称されるものであり、湾岸、河川、土流工事において仕切材として一般的に使用されている製品である。この実施形態に係る土壌浄化装置においては、第１電極１１および第２電極１２として、導電性を有する鋼矢板を使用している。鋼矢板から成る第１電極１１および第２電極１２は、バイブロハンマー工法や圧入工法等により、ジョイント部を接合しながら、地上から土壌中に埋設される。 The first electrode 11 is composed of a steel sheet pile as shown in FIG. A steel sheet pile, also called a sheet pile, is a product generally used as a partition material in gulf, river, and soil flow construction. In the soil purification apparatus according to this embodiment, conductive steel sheet piles are used as the first electrode 11 and the second electrode 12 . The first electrode 11 and the second electrode 12 made of steel sheet piles are buried in the soil from the ground while joining joint portions by a vibratory hammer construction method, a press-fitting method, or the like.

図１を参照して、多孔状の吸引管３１と吸引除去部３２とからなる吸引除去機構は、加温装置により加温された土壌におけるＶＯＣ等を除去するためのものである。すなわち、土壌の温度が上昇すると、土壌粒子に吸着しているテトラクロロエチレン、トリクロロエチレン、ジクロロエチレン、トリクロロエタン等のＶＯＣが土壌から脱離して地下水中に溶出する。これにより、土壌が浄化される。吸引除去機構は、吸引管３１を利用して地下水を地上に汲み上げる揚水処理や、地下水からガス化したＶＯＣを含む地下ガスを吸引するガス吸引処理等を行うことで、ＶＯＣを土壌から除去して土壌の汚染をより効果的に浄化するものである。 Referring to FIG. 1, a suction removal mechanism comprising a porous suction pipe 31 and a suction removal portion 32 is for removing VOCs and the like from soil heated by a heating device. That is, when the temperature of soil rises, VOCs such as tetrachlorethylene, trichlorethylene, dichlorethylene, and trichloroethane adsorbed to soil particles are desorbed from the soil and eluted into groundwater. This purifies the soil. The suction removal mechanism removes VOCs from the soil by performing a pumping process for pumping groundwater to the ground using the suction pipe 31, a gas suction process for sucking underground gas containing VOC gasified from the groundwater, and the like. It cleans up soil contamination more effectively.

この吸引除去機構における吸引管３１は、既に建築済みの工場建屋１０１の下方の領域の土壌からＶＯＣ等を除去するためのものである。このため、吸引管３１を工場建屋１０１の下方に埋設することは困難である。図１においては、吸引管３１を第１電極１１および第２電極１２の間に配置した状態を模式的に示しているが、この吸引管３１は、工場建屋１０１の周囲から工場建屋１０１の下方に向けて挿入するように埋設される。 The suction pipe 31 in this suction removal mechanism is for removing VOCs and the like from the soil in the area below the factory building 101 that has already been constructed. Therefore, it is difficult to bury the suction pipe 31 under the factory building 101 . 1 schematically shows a state in which the suction pipe 31 is arranged between the first electrode 11 and the second electrode 12. This suction pipe 31 extends from the periphery of the factory building 101 to the lower part of the factory building 101. embedded so as to be inserted toward the

以上のような構成を有する土壌浄化装置により工場建屋１０１の下方の土壌を浄化するときには、最初に、図２に示すように、第１電極１１および第２電極１２を矩形状を成す工場建屋１０１における互いに対向する一対の面に沿って土壌中に埋設する。そして、単相交流電源２１により第１電極１１および第２電極１２に対して単相交流電流を供給する。これにより、土壌の電気抵抗でジュール熱が発生し、土壌が加温される。そして、土壌の温度が上昇すると、土壌粒子に吸着しているテトラクロロエチレン、トリクロロエチレン、ジクロロエチレン、トリクロロエタン等のＶＯＣが土壌から脱離して地下水中に溶出する。引き続き、吸引除去機構における吸引管３１から、地下水を汲み上げ、あるいは、地下水からガス化したＶＯＣを含む地下ガスを吸引する。これにより、土壌の汚染を浄化することが可能となる。このとき、第１電極１１および第２電極１２は板状の鋼矢板から構成されることから、土壌から離脱した汚染物質の外部への漏洩を抑制することが可能となる。 When the soil below the factory building 101 is purified by the soil purification apparatus having the above configuration, first, as shown in FIG. It is embedded in the soil along a pair of surfaces facing each other. A single-phase alternating current is supplied to the first electrode 11 and the second electrode 12 by the single-phase alternating current power supply 21 . As a result, Joule heat is generated by the electrical resistance of the soil, and the soil is heated. When the temperature of the soil rises, VOCs such as tetrachlorethylene, trichlorethylene, dichloroethylene, and trichloroethane adsorbed on soil particles are desorbed from the soil and eluted into groundwater. Subsequently, groundwater is pumped up from the suction pipe 31 in the suction removal mechanism, or underground gas containing VOC gasified from the groundwater is sucked. This makes it possible to purify soil contamination. At this time, since the first electrode 11 and the second electrode 12 are composed of plate-shaped steel sheet piles, it is possible to suppress leakage of contaminants separated from the soil to the outside.

図４は、第１電極１１および第２電極１２を図２に示す状態で配置した場合において、第１電極１１および第２電極１２の中央付近における深さ３、５、７、９、１１メートルの位置の土壌の温度の推移を示すグラフである。この図における横軸は通電日数（日）を示し、縦軸は温度（摂氏）を示している。 4 shows depths of 3, 5, 7, 9, and 11 meters near the center of the first electrode 11 and the second electrode 12 when the first electrode 11 and the second electrode 12 are arranged in the state shown in FIG. is a graph showing the transition of the temperature of the soil at the position of . In this figure, the horizontal axis indicates the number of days (days) of energization, and the vertical axis indicates the temperature (Celsius).

このグラフからも明らかなように、第１電極１１および第２電極１２の間の土壌は、各深さ位置において適切に昇温していることが確認できる。 As is clear from this graph, it can be confirmed that the soil between the first electrode 11 and the second electrode 12 is properly heated at each depth position.

図５は、図２に示す第１電極１１と第２電極１２との間の電極間電位差を示すグラフである。また、図６は、比較例としての、図１０に示す工場建屋１０１を介した棒状電極１０間の電極間電位差を示すグラフである。なお、これらのグラフにおいて、横軸は距離（メートル）を示し、縦軸は電圧（ボルト）を示している。 FIG. 5 is a graph showing the inter-electrode potential difference between the first electrode 11 and the second electrode 12 shown in FIG. Moreover, FIG. 6 is a graph showing the inter-electrode potential difference between the rod-shaped electrodes 10 via the factory building 101 shown in FIG. 10 as a comparative example. In these graphs, the horizontal axis indicates distance (meters), and the vertical axis indicates voltage (volts).

図５に示すように、第１電極１１および第２電極１２間の電圧勾配は一定であり、電圧勾配（１メートル当たりの電位差）は［１００Ｖ／２２ｍ＝４．５Ｖ／ｍ］となっている。これに対して、図６に示す棒状電極１０間の電圧勾配は、電極近傍（電極から電極間距離の１８％離隔した領域）においては［４０Ｖ／２ｍ＝２０Ｖ／ｍ］であり、棒状電極１０間の中央付近では［２０Ｖ／１４ｍ＝１．４Ｖ／ｍ］となっている。一般に、土壌に発生するジュール熱は、電流が同じであれば電圧勾配が大きい場所ほど大きくなる。このため、図１０に示す棒状電極１０の場合には、中央付近において土壌の温度上昇２時間がかかることになる。これに対して、図２に示す第１電極１１および第２電極１２を使用した場合には、電圧勾配が一定であり、電極間の土壌を均一に加温することが可能となる。 As shown in FIG. 5, the voltage gradient between the first electrode 11 and the second electrode 12 is constant, and the voltage gradient (potential difference per meter) is [100V/22m=4.5V/m]. . On the other hand, the voltage gradient between the rod-shaped electrodes 10 shown in FIG. It is [20V/14m=1.4V/m] near the center of the interval. In general, the Joule heat generated in the soil increases as the voltage gradient increases if the current is the same. Therefore, in the case of the rod-like electrode 10 shown in FIG. 10, it takes two hours for the temperature of the soil to rise near the center. On the other hand, when the first electrode 11 and the second electrode 12 shown in FIG. 2 are used, the voltage gradient is constant and the soil between the electrodes can be uniformly heated.

以上のように、この発明の実施形態に係る土壌浄化装置によれば、鋼矢板より構成され土壌中に互いに対向する状態で挿入された第１、第２電極１１、１２の作用により、汚染土壌の上部に工場建屋１０１等が存在する場合においても、工場建屋１０１の下方の汚染土壌を効率的に浄化することが可能となる。そして、第１、第２電極１１、１２が板状の鋼矢板から構成されることから、土壌から離脱した汚染物質の外部への漏洩を抑制することが可能となる。 As described above, according to the soil remediation apparatus according to the embodiment of the present invention, the first and second electrodes 11 and 12 made of steel sheet piles and inserted into the soil facing each other remove contaminated soil. Even if the factory building 101 or the like exists above the factory building 101, the contaminated soil below the factory building 101 can be efficiently purified. Since the first and second electrodes 11 and 12 are made of plate-shaped steel sheet piles, it is possible to suppress the leakage of contaminants separated from the soil to the outside.

次に、この発明の実施形態に係る土壌浄化装置の変形例について説明する。図７は、この発明の実施形態に係る土壌浄化装置の変形例における土壌加温装置の設置状態を示す概要図である。なお、図７においては、上部に平面図を示し、下部に縦断面図を示している。 Next, a modified example of the soil purification apparatus according to the embodiment of this invention will be described. FIG. 7 is a schematic diagram showing an installation state of a soil warming device in a modification of the soil purification device according to the embodiment of the invention. In addition, in FIG. 7, a plan view is shown in the upper part, and a longitudinal sectional view is shown in the lower part.

図２に示す実施形態に係る土壌浄化装置は、鋼矢板より構成される第１電極１１および第２電極１２と、これらの第１電極１１および第２電極１２に単相交流電流を供給することにより第１電極１１および第２電極１２の間に電位差を印加する単相交流電源２１とを有する加温装置を備えている。これに対して、この変形例に係る土壌浄化装置における加温装置は、さらに、鋼矢板より構成される第３電極１３および第４電極１４と、これらの第３電極１３および第４電極１４に単相交流電流を供給する単相交流電源２２とを備えている。第１電極１１および第２電極１２は、図７に示すように、矩形状を成す工場建屋１０１における互いに対向する一対の面に沿って、土壌中に埋設される。一方、第３電極１３および第４電極１４は、矩形状を成す工場建屋１０１における第１電極１１および第２電極１２とは直交する方向の互いに対向する一対の面に沿って、土壌中に埋設される。 The soil purification apparatus according to the embodiment shown in FIG. and a single-phase AC power supply 21 that applies a potential difference between the first electrode 11 and the second electrode 12 by means of a heating device. On the other hand, the heating device in the soil remediation device according to this modification further includes a third electrode 13 and a fourth electrode 14 made of steel sheet piles, and the third electrode 13 and the fourth electrode 14 and a single-phase AC power supply 22 for supplying a single-phase AC current. As shown in FIG. 7, the first electrode 11 and the second electrode 12 are buried in the soil along a pair of surfaces facing each other in the rectangular factory building 101 . On the other hand, the third electrode 13 and the fourth electrode 14 are buried in the soil along a pair of surfaces facing each other in a direction orthogonal to the first electrode 11 and the second electrode 12 in the rectangular factory building 101. be done.

これらの第１電極１１、第２電極１２、第３電極１３および第４電極１４は、加温対象となる土壌上に建設された工場建屋１０１の周囲を囲うように埋設される。なお、第１電極１１、第２電極１２、第３電極１３および第４電極１４は、それらの間に電流が流れることを防止するため、互いにわずかな距離だけ離隔して配置されている。但し、第１電極１１、第２電極１２、第３電極１３および第４電極１４を、絶縁部材を介して接続する状態で埋設してもよい。 These first electrode 11, second electrode 12, third electrode 13 and fourth electrode 14 are embedded so as to surround a factory building 101 constructed on soil to be heated. The first electrode 11, the second electrode 12, the third electrode 13, and the fourth electrode 14 are separated from each other by a small distance in order to prevent current from flowing therebetween. However, the first electrode 11, the second electrode 12, the third electrode 13, and the fourth electrode 14 may be embedded while being connected via an insulating member.

このような変形例によれば、互いに対向配置された第１電極１１および第２電極１２と、第３電極１３および第４電極１４とにより、工場建屋１０１の下方の土壌をより効率的に加温することができ、工場建屋１０１の下方の土壌をより迅速に浄化することが可能となる。また、工場建屋１０１の下方の土壌を鋼矢板より成る第１電極１１、第２電極１２、第３電極１３および第４電極１４により囲うことから、土壌から離脱した汚染物質の外部への漏洩をより効果的に抑制することが可能となる。 According to this modification, the soil under the factory building 101 is heated more efficiently by the first electrode 11 and the second electrode 12, and the third electrode 13 and the fourth electrode 14, which are arranged to face each other. It can heat up and clean up the soil below the factory building 101 more quickly. In addition, since the soil under the factory building 101 is surrounded by the first electrode 11, the second electrode 12, the third electrode 13 and the fourth electrode 14 made of steel sheet piles, the leakage of contaminants released from the soil to the outside is prevented. It becomes possible to suppress more effectively.

次に、この発明の実施形態に係る土壌浄化装置の他の変形例について説明する。図８は、この発明の実施形態に係る土壌浄化装置の他の変形例における土壌加温装置の設置状態を示す概要図である。 Next, another modification of the soil purification apparatus according to the embodiment of this invention will be described. FIG. 8 is a schematic diagram showing an installation state of a soil warming device in another modified example of the soil purification device according to the embodiment of the present invention.

この変形例においては、工場建屋１０２が平面視において六角形の形状を有する場合を示している。すなわち、この変形例に係る土壌浄化装置における加温装置は、鋼矢板より構成される第１電極１１および第２電極１２と、これらの第１電極１１および第２電極１２に単相交流電流を供給する単相交流電源２１と、鋼矢板より構成される第３電極１３および第４電極１４と、これらの第３電極１３および第４電極に単相交流電流を供給する単相交流電源２２と、鋼矢板より構成される第５電極１５および第６電極１６と、これらの第５電極１５および第６電極１６に単相交流電流を供給する単相交流電源２３と、を備えている。図８に示すように、第１電極１１と第２電極１２、第３電極１３と第４電極１４、第５電極１５と第６電極１６は、工場建屋１０２における互いに対向する一対の面に沿って、土壌中に埋設される。 This modification shows the case where the factory building 102 has a hexagonal shape in plan view. That is, the heating device in the soil remediation device according to this modification includes a first electrode 11 and a second electrode 12 made of steel sheet piles, and a single-phase alternating current applied to the first electrode 11 and the second electrode 12. A single-phase AC power supply 21 to supply a single-phase AC power supply 21, a third electrode 13 and a fourth electrode 14 made of steel sheet piles, and a single-phase AC power supply 22 to supply a single-phase AC current to the third electrode 13 and the fourth electrode. , a fifth electrode 15 and a sixth electrode 16 made of steel sheet piles, and a single-phase alternating current power supply 23 for supplying a single-phase alternating current to the fifth electrode 15 and the sixth electrode 16 . As shown in FIG. 8, the first electrode 11 and the second electrode 12, the third electrode 13 and the fourth electrode 14, the fifth electrode 15 and the sixth electrode 16 are arranged along a pair of surfaces facing each other in the factory building 102. and buried in the soil.

これらの第１電極１１、第２電極１２、第３電極１３、第４電極１４、第５電極１５および第６電極１６は、加温対象となる土壌上に建設された工場建屋１０２の周囲を囲うように埋設される。なお、第１電極１１、第２電極１２、第３電極１３、第４電極１４、第５電極１５および第６電極１６は、それらの間に電流が流れることを防止するため、互いにわずかな距離だけ離隔して配置されている。但し、第１電極１１、第２電極１２、第３電極１３、第４電極１４、第５電極１５および第６電極１６を、絶縁部材を介して接続する状態で埋設してもよい。 These first electrode 11, second electrode 12, third electrode 13, fourth electrode 14, fifth electrode 15 and sixth electrode 16 extend around the factory building 102 constructed on the soil to be heated. It is buried so as to surround it. In addition, the first electrode 11, the second electrode 12, the third electrode 13, the fourth electrode 14, the fifth electrode 15 and the sixth electrode 16 are separated from each other by a slight distance in order to prevent current from flowing therebetween. are spaced apart. However, the first electrode 11, the second electrode 12, the third electrode 13, the fourth electrode 14, the fifth electrode 15 and the sixth electrode 16 may be embedded while being connected via an insulating member.

このような変形例によれば、互いに対向配置された第１電極１１と第２電極１２、第３電極１３と第４電極１４、第５電極１５と第６電極１６とにより、工場建屋１０２の下方の土壌をより効率的に加温することができ、工場建屋１０２の下方の土壌をより迅速に浄化することが可能となる。また、工場建屋１０２の下方の土壌を鋼矢板より成る第１電極１１、第２電極１２、第３電極１３、第４電極１４、第５電極１５および第６電極１６により囲うことから、土壌から離脱した汚染物質の外部への漏洩をより効果的に抑制することが可能となる。 According to such a modification, the first electrode 11 and the second electrode 12, the third electrode 13 and the fourth electrode 14, the fifth electrode 15 and the sixth electrode 16, which are arranged to face each other, form the structure of the factory building 102. The soil below can be warmed more efficiently, allowing the soil below the factory building 102 to be cleaned more quickly. In addition, since the soil below the factory building 102 is surrounded by the first electrode 11, the second electrode 12, the third electrode 13, the fourth electrode 14, the fifth electrode 15 and the sixth electrode 16 made of steel sheet piles, It becomes possible to more effectively suppress the leakage of the separated contaminants to the outside.

次に、この発明の実施形態に係る土壌浄化装置のさらに他の変形例について説明する。図９は、この発明の実施形態に係る土壌浄化装置のさらに他の変形例における土壌加温装置の設置状態を示す概要図である。 Next, still another modified example of the soil purification apparatus according to the embodiment of this invention will be described. FIG. 9 is a schematic diagram showing an installation state of a soil warming device in still another modified example of the soil purification device according to the embodiment of the present invention.

この変形例においては、工場建屋１０３が平面視において三角形の形状を有する場合を示している。すなわち、この変形例に係る土壌浄化装置における加温装置は、鋼矢板より構成される第１電極１７、第２電極１８および第３電極１９と、これらの第１電極１７、第２電極１８および第３電極１９に三相交流電流を供給することにより第１電極１７、第２電極１８および第３電極１９の間に電位差を印加する単相交流電源２４と、を備えている。図９に示すように、第１電極１７、第２電極１８および第３電極１９は、工場建屋１０３の外周に沿って互いに対向する状態で、土壌中に埋設される。 This modification shows the case where the factory building 103 has a triangular shape in plan view. That is, the heating device in the soil remediation device according to this modification includes a first electrode 17, a second electrode 18 and a third electrode 19 made of steel sheet piles, and these first electrode 17, second electrode 18 and A single-phase AC power supply 24 that applies a potential difference between the first electrode 17 , the second electrode 18 and the third electrode 19 by supplying a three-phase AC current to the third electrode 19 . As shown in FIG. 9 , the first electrode 17 , the second electrode 18 and the third electrode 19 are embedded in the soil along the outer circumference of the factory building 103 while facing each other.

これらの第１電極１７、第２電極１８および第３電極１９は、加温対象となる土壌上に建設された工場建屋１０３の周囲を囲うように埋設される。なお、第１電極１７、第２電極１８および第３電極１９は、それらの間に電流が流れることを防止するため、互いにわずかな距離だけ離隔して配置されている。但し、第１電極１７、第２電極１８および第３電極１９を、絶縁部材を介して接続する状態で埋設してもよい。 These first electrode 17, second electrode 18 and third electrode 19 are embedded so as to surround a factory building 103 constructed on the soil to be heated. The first electrode 17, the second electrode 18 and the third electrode 19 are spaced apart from each other by a small distance in order to prevent current from flowing between them. However, the first electrode 17, the second electrode 18 and the third electrode 19 may be embedded in a state of being connected via an insulating member.

このような変形例によれば、互いに対向配置された第１電極１７と第２電極１８および第３電極１９により、工場建屋１０３の下方の土壌をより効率的に加温することができ、工場建屋１０３の下方の土壌をより迅速に浄化することが可能となる。また、工場建屋１０３の下方の土壌を鋼矢板より成る第１電極１７、第２電極１８および第３電極１９により囲うことから、土壌から離脱した汚染物質の外部への漏洩をより効果的に抑制することが可能となる。 According to this modification, the first electrode 17, the second electrode 18, and the third electrode 19, which are arranged to face each other, can more efficiently heat the soil below the factory building 103. It is possible to clean up the soil below the building 103 more quickly. In addition, since the soil under the factory building 103 is surrounded by the first electrode 17, the second electrode 18 and the third electrode 19 made of steel sheet piles, the leakage of contaminants separated from the soil to the outside is more effectively suppressed. It becomes possible to

なお、上述した実施形態においては、土壌を加温した後に、吸引除去機構により揚水処理やガス吸引処理等を行っている。しかしながら、上述したように、土壌を加温することだけでも土壌を浄化することは可能である。このため、吸引除去機構による揚水処理やガス吸引処理等を省略してもよい。 In addition, in the embodiment described above, after the soil is heated, pumping processing, gas suction processing, and the like are performed by the suction removal mechanism. However, as mentioned above, it is possible to purify the soil simply by warming the soil. For this reason, the water pumping process, the gas suction process, etc. by the suction removal mechanism may be omitted.

上述した例示的な実施形態は、以下の態様の具体例であることが当業者により理解される。 It will be appreciated by those skilled in the art that the exemplary embodiments described above are specific examples of the following aspects.

（第１項）
電気加温法による土壌加温装置を備えた土壌浄化装置であって、前記土壌加温装置は、
板状の導電部材より構成され、土壌中に互いに対向する状態で挿入された第１、第２電極と、前記第１、第２電極の間に電位差を印加する電源と、を備える土壌浄化装置。 (Section 1)
A soil remediation device equipped with a soil warming device using an electric heating method, the soil warming device comprising:
A soil remediation device comprising: first and second electrodes, each made of a plate-shaped conductive member, inserted into the soil so as to face each other; and a power source for applying a potential difference between the first and second electrodes. .

第１項に記載の土壌浄化装置によれば、板状の導電部材より構成され土壌中に互いに対向する状態で挿入された第１、第２電極の作用により、汚染土壌の上部に建築物等が存在する場合においても、建築物等の下方の汚染土壌を効率的に浄化することが可能となる。そして、第１、第２電極が板状をなすことから、土壌から離脱した汚染物質の外部への漏洩を抑制することが可能となる。 According to the soil remediation apparatus described in item 1, the first and second electrodes, which are composed of plate-shaped conductive members and are inserted into the soil in a state of facing each other, generate a building or the like above the contaminated soil. Even in the presence of , it is possible to efficiently purify the contaminated soil below the building or the like. Since the first and second electrodes are plate-shaped, it is possible to suppress the leakage of contaminants separated from the soil to the outside.

（第２項）
第１項に記載の土壌浄化装置において、前記第１、第２電極が鋼矢板である土壌浄化装置。 (Section 2)
The soil purification apparatus according to claim 1, wherein the first and second electrodes are steel sheet piles.

第２項に記載の土壌浄化装置によれば、一般的に使用され販売されている鋼矢板を電極として使用することができ、また、一般的な工法により土壌中に埋設することが可能となる。 According to the soil remediation device described in paragraph 2, a commonly used and sold steel sheet pile can be used as an electrode, and can be buried in the soil by a general construction method. .

（第３項）
第１項または第２項に記載の土壌浄化装置において、前記土壌加温装置により加温される土壌の領域から、ガスおよび地下水の少なくとも一方を吸引除去する吸引除去機構をさらに備える土壌浄化装置。 (Section 3)
3. The soil remediation device according to claim 1 or 2, further comprising a suction removal mechanism for suctioning and removing at least one of gas and groundwater from the area of the soil heated by the soil warming device.

第３項に記載の土壌浄化装置によれば、加温装置により加温された土壌の領域からガスおよび地下水の少なくとも一方を吸引除去して、土壌を迅速かつ効果的に浄化することが可能となる。 According to the soil remediation device of item 3, at least one of gas and groundwater is removed by suction from the area of the soil heated by the heating device, so that the soil can be quickly and effectively remedied. Become.

（第４項）
電気加温法による土壌浄化方法であって、加温対象となる土壌中に、板状の導電部材より構成される第１、第２電極を対向する状態で埋設する電極埋設工程と、前記第１、第２電極の間に電位差を印加して土壌を加温する土壌加温工程と、を含む土壌浄化方法。 (Section 4)
A soil remediation method using an electric heating method, comprising: an electrode embedding step of embedding first and second electrodes composed of plate-like conductive members in the soil to be heated so as to face each other; 1. A soil remediation method including a soil heating step of applying a potential difference between the second electrodes to heat the soil.

第４項に記載の土壌浄化方法によれば、板状の導電部材より構成され土壌中に互いに対向する状態で挿入された第１、第２電極の作用により、汚染土壌の上部に建築物等が存在する場合においても、建築物等の下方の汚染土壌を効率的に浄化することが可能となる。そして、第１、第２電極が板状をなすことから、土壌から離脱した汚染物質の外部への漏洩を抑制することが可能となる。 According to the soil remediation method described in item 4, by the action of the first and second electrodes which are composed of plate-like conductive members and are inserted in the soil facing each other, buildings and the like are placed above the contaminated soil. Even in the presence of , it is possible to efficiently purify the contaminated soil below the building or the like. Since the first and second electrodes are plate-shaped, it is possible to suppress the leakage of contaminants separated from the soil to the outside.

（第５項）
第４項に記載の土壌浄化方法において、前記土壌加温工程において加温された土壌の領域から、ガスおよび地下水の少なくとも一方を吸引除去する吸引除去工程をさらに含む土壌浄化方法。 (Section 5)
5. The soil remediation method according to claim 4, further comprising a suction removal step of suctioning and removing at least one of gas and groundwater from the region of the soil heated in the soil warming step.

第５項に記載の土壌浄化方法によれば、加温装置により加温された土壌の領域からガスおよび地下水の少なくとも一方を吸引除去して、土壌を迅速かつ効果的に浄化することが可能となる。 According to the soil remediation method according to item 5, at least one of gas and groundwater is removed by suction from the area of the soil heated by the heating device, and the soil can be quickly and effectively remedied. Become.

（第６項）
第４項または第５項に記載の土壌浄化方法において、前記電極埋設工程においては、前記加温対象となる土壌上に建設された建物の周囲の少なくとも一部を囲うように前記第１、第２電極を埋設する土壌浄化方法。 (Section 6)
6. In the soil remediation method according to item 4 or 5, in the electrode embedding step, the first and the first electrodes surround at least part of a building constructed on the soil to be heated. A soil purification method in which two electrodes are buried.

第６項に記載の土壌浄化方法によれば、板状の第１、第２電極により加温対象となる土壌上に建設された建物の周囲の少なくとも一部を囲うことから、土壌から離脱した汚染物質の外部への漏洩を抑制することが可能となる。 According to the soil remediation method described in item 6, since the plate-like first and second electrodes surround at least a part of the building built on the soil to be heated, the It is possible to suppress leakage of contaminants to the outside.

なお、上述した記載はこの発明の実施形態の説明のためのものであり、この発明を限定するものではない。 It should be noted that the above description is for the description of the embodiments of the present invention, and does not limit the present invention.

１１ 第１電極
１２ 第２電極
１３ 第３電極
１４ 第４電極
１５ 第５電極
１６ 第６電極
１７ 第１電極
１８ 第２電極
１９ 第３電極
２１ 単相交流電源
２２ 単相交流電源
２３ 単相交流電源
２４ 三相交流電源
３１ 吸引管
３２ 吸引除去部
３３ 管路
１０１ 工場建屋
１０２ 工場建屋
１０３ 工場建屋
11 1st electrode 12 2nd electrode 13 3rd electrode 14 4th electrode 15 5th electrode 16 6th electrode 17 1st electrode 18 2nd electrode 19 3rd electrode 21 single-phase alternating current power supply 22 single-phase alternating current power supply 23 single-phase alternating current Power supply 24 Three-phase AC power supply 31 Suction pipe 32 Suction removal part 33 Pipe line 101 Factory building 102 Factory building 103 Factory building

Claims (8)

電気加温法による土壌加温装置を備えた土壌浄化装置であって、
前記土壌加温装置は、
それぞれ複数の鋼矢板をジョイント部で接合することにより構成され、土壌中に互いに対向する状態で挿入された第１電極及び第２電極と、
前記第１電極と前記第２電極の間に電位差を印加する電源と、
を備える土壌浄化装置。 A soil remediation device equipped with a soil heating device using an electric heating method,
The soil warming device,
a first electrode and a second electrode , each configured by joining a plurality of steel sheet piles at joints and inserted into the soil in a state of facing each other;
a power supply that applies a potential difference between the first electrode and the second electrode;
A soil remediation device comprising: 請求項１に記載の土壌浄化装置において、In the soil purification device according to claim 1,
さらに、板状の導電部材により構成され、前記土壌加温装置により加温される土壌中に挿入された１つ又は複数の追加電極を含み、Furthermore, one or more additional electrodes composed of plate-shaped conductive members and inserted into the soil heated by the soil warming device,
前記第１電極、前記第２電極及び前記１つ又は複数の追加電極は、前記加温される土壌上に建設された建物の周囲を囲うように配置されている、土壌浄化装置。A soil remediation apparatus, wherein the first electrode, the second electrode and the one or more additional electrodes are arranged to surround a building constructed on the soil to be heated. 請求項２に記載の土壌浄化装置において、In the soil purification device according to claim 2,
前記第１電極、前記第２電極及び前記１つ又は複数の追加電極は、互いに絶縁部材を介して接続されている、土壌浄化装置。A soil purification apparatus, wherein the first electrode, the second electrode and the one or more additional electrodes are connected to each other via an insulating member. 請求項１～３のいずれか１項に記載の土壌浄化装置において、
前記土壌加温装置により加温される土壌の領域から、ガスおよび地下水の少なくとも一方を吸引除去する吸引除去機構をさらに備える土壌浄化装置。 In the soil purification device according to any one of claims 1 to 3 ,
A soil remediation device further comprising a suction removal mechanism for suctioning and removing at least one of gas and groundwater from a region of soil heated by the soil warming device. 電気加温法による土壌浄化方法であって、
土壌中に、それぞれ複数の鋼矢板をジョイント部で接合することにより構成される第１電極及び第２電極を対向する状態で埋設する電極埋設工程と、
前記第１電極と前記第２電極の間に電位差を印加して土壌を加温する土壌加温工程と、
を含み、
前記電極埋設工程では、前記ジョイント部を接合しながら、前記第１電極及び前記第２電極を地上から前記土壌中に埋設する、土壌浄化方法。 A soil remediation method using an electric heating method,
an electrode embedding step of embedding, in soil , a first electrode and a second electrode configured by joining a plurality of steel sheet piles at joints, facing each other ;
a soil warming step of applying a potential difference between the first electrode and the second electrode to heat the soil;
including
In the electrode embedding step, the soil remediation method embeds the first electrode and the second electrode from the ground into the soil while joining the joint portion. 請求項５に記載の土壌浄化方法において、
前記電極埋設工程では、バイブロハンマー工法又は圧入工法により前記第１電極及び前記第２電極を前記土壌中に埋設する、土壌浄化方法。 In the soil remediation method according to claim 5,
The soil remediation method, wherein, in the electrode embedding step, the first electrode and the second electrode are embedded in the soil by a vibro-hammer method or a press-fit method. 請求項５又は６に記載の土壌浄化方法において、
前記土壌加温工程において加温される土壌の領域から、ガスおよび地下水の少なくとも一方を吸引除去する吸引除去工程をさらに含む土壌浄化方法。 In the soil remediation method according to claim 5 or 6 ,
A soil remediation method further comprising a suction removal step of suctioning off at least one of gas and groundwater from the region of the soil heated in the soil warming step. 請求項５～７のいずれか１項に記載の土壌浄化方法において、
前記電極埋設工程においては、前記土壌加温工程において加温される土壌上に建設された建物の周囲の少なくとも一部を囲うように前記第１電極及び第２電極、並びに板状の導電部材により構成された１つ又は複数の追加電極を埋設する土壌浄化方法。 In the soil remediation method according to any one of claims 5 to 7 ,
In the electrode embedding step, the first electrode, the second electrode , and a plate-like conductive member surround at least a part of the building constructed on the soil heated in the soil warming step. A soil remediation method embedding one or more additional configured electrodes .
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