JP2007083196A - Method and apparatus for eliminating soil contaminant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for eliminating soil contaminants, which makes it possible to efficiently and economically eliminating to a limited extent soil contaminants infiltrating into the soil of ground containing cohesive soil from which soil contaminants are eliminated with difficulty. <P>SOLUTION: Upon elimination of soil contaminants infiltrating into the soil, a long shaped drain material 10 provided with a capillary 13 in an inserted manner along a longitudinal direction is used. The drain material 10 is laid underground along a vertical direction, and then ground water and gases or at least ground water containing soil contaminants is collected above ground via the capillary 13 of the drain material 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a soil pollutant removal method and a removal apparatus used to remove soil pollutants that have penetrated into the ground together with groundwater.

  In recent years, it has been obligated to investigate pollution conditions and remove pollutants for the ground that is expected to be contaminated with soil, especially when the site of a facility such as a factory is used as residential land. It is very important to remove soil pollutants that have penetrated into the ground.

  In addition, examples of soil pollutants to be removed include volatile organic compounds (VOC) used for solvents and cleaning agents, heavy metals, and agricultural chemicals. Among these, those with high density and those that are entrained in water penetrate into the ground by the action of gravity over time, and when soil contamination becomes apparent, soil contamination reaches a depth of several tens of meters Sometimes.

  Conventionally, in order to remove soil pollutants that have penetrated into the ground, the ground is excavated to directly remove soil and groundwater containing soil pollutants, or additives are added to the ground before excavation or soil after excavation. In addition, it was common to detoxify soil contaminants by stirring and mixing the soil and additives.

  If the ground to remove soil pollutants consists of sandy soil (sand gravel, etc.) with high water permeability, groundwater can be obtained by installing a drainage well and draining continuously with a pump. At the same time, soil contaminants were removed.

  However, when the ground to remove soil pollutants contains clayey soil (such as loam), it is difficult to sufficiently remove soil pollutants present in the gap because clayey soil has low water permeability. there were.

  And, in the removal method that excavates the ground or mixes and mixes the soil and additives, soil contaminants may penetrate several tens of meters in depth, so that the work becomes very large. In addition, the removal method using a water collection well is limited to ground with high water permeability as described above, and groundwater other than the range to remove soil pollutants is also removed. There is a problem that it is difficult to remove soil pollutants within a certain range.

  The present invention has been made in view of the above-described conventional situation, and in particular, in soil including viscous soil where removal of soil pollutants is difficult, the soil pollutants penetrating into the ground are efficiently and economically. And it aims at providing the removal method and removal apparatus of the soil pollutant which can be removed limitedly.

  In the method for removing soil pollutants of the present invention, when removing soil pollutants that have penetrated into the ground, a long drain material in which a thin tube is inserted along the longitudinal direction is used. A drain material is buried in the ground, and at least the groundwater of the groundwater and gas containing soil pollutants is collected on the ground side through a thin tube of the drain material.

  In addition, the soil pollutant removal apparatus of the present invention includes a long drain material in which a thin tube is inserted along the longitudinal direction and embedded in the ground along the vertical direction, and a drain material embedded in the ground. It is characterized by comprising groundwater recovery means for recovering groundwater containing soil pollutants through a pipe connected to the narrow pipe.

  Here, in the above-described removal method and removal apparatus, the ground from which soil contaminants are to be removed naturally has a predetermined range, and therefore, a large number of drain materials are buried at predetermined intervals in the range. Then, groundwater and gas containing soil pollutants will be collected on the ground side through the thin tubes of each drain material.

  Furthermore, the soil pollutant removal apparatus of the present invention is characterized in that, as a more preferable embodiment, the apparatus includes a gas recovery means for recovering a gas via a pipe connected to a drain tube narrowly buried in the ground. .

  Furthermore, the soil pollutant removal apparatus of the present invention is characterized in that, as a more preferred embodiment, the apparatus includes a suction pump for sucking groundwater and gas containing soil pollutants to the respective collection means side through a pipe. Yes.

  Furthermore, the soil pollutant removal apparatus of the present invention is characterized in that, as a more preferred embodiment, the groundwater and gas recovery means includes a processing means for detoxifying the recovered groundwater and gas.

  According to the method for removing soil pollutants of the present invention, even in the ground containing viscous soil where it is difficult to remove soil pollutants, mainly by the work of burying a drain material provided with a thin tube in the ground, Can be removed economically and efficiently together with groundwater, and soil contaminants can be removed within a limited range. Easy to centrally manage.

  According to the soil pollutant removal apparatus of the present invention, by adopting the long drain material and the groundwater recovery means, the soil pollutant in the ground is mainly removed by the operation of burying the drain material in the ground. In addition to being able to remove it economically and efficiently, it is possible to remove soil pollutants in a limited range, and to strictly control the soil pollutants collected on the ground side in one place. it can.

  Further, the apparatus for removing soil pollutants of the present invention employs gas recovery means, particularly when the soil pollutants are volatile organic compounds, and collects volatile organic compound gases on the ground side. Strictly centralized management in one place.

  Furthermore, the apparatus for removing soil pollutants of the present invention can promote removal and recovery of soil pollutants that have penetrated into the ground by employing a suction pump, which can contribute to shortening the construction period and the like. It will be a thing.

  Furthermore, the apparatus for removing soil pollutants of the present invention is very useful in terms of environmental protection and the like by adopting groundwater and gas recovery means including treatment means.

  Hereinafter, an embodiment of a soil contaminant removal method and removal apparatus according to the present invention will be described with reference to the drawings.

  The soil pollutant removal apparatus shown in FIG. 1 (a) as a whole removes soil pollutants that have penetrated into the ground, that is, soil contaminants that are mainly liquid, together with groundwater. A drain material 10 is embedded in the ground G to be buried in the ground.

  As shown in FIGS. 1B and 1C, the drain material 10 includes a main material 11 having a flat cross-sectional shape and a long shape, a corrugated core material 12 accommodated in the longitudinal direction of the main material 11, and a main material. 11 is provided with an appropriate number (one is shown in the figure) of thin tubes 13 inserted along the longitudinal direction.

  The main material 11 is formed of, for example, a non-woven fabric and is permeable to liquid and gas. The core material 12 is made of, for example, paper or resin, and maintains the hollow shape of the main material 11. The thin tube 13 is, for example, a resin tube having an inner diameter of about 2 mm, and its position and length are adjusted so that the upper end protrudes from the main material 11 and the lower end is higher than the lower end of the main material 11. It is. The capillary 13 can suck up liquid by capillary action.

  And the drain material 10 is buried vertically along the vertical direction to the depth in the ground where soil pollutants exist using a known drain driving machine, and the upper end is exposed to the ground. To do. At this time, since the ground G naturally has a predetermined area, a large number of drain members 10 are embedded in the ground G at predetermined intervals in the vertical and horizontal directions. Moreover, the depth in the ground where soil pollutants and groundwater exist can be grasped by conducting a geological survey or the like conducted in advance.

  In addition, the removing device attaches a joint 14 to the upper end portion of each buried drain material 10, and connects the upper end portion of the thin tube 13 and the branch pipe 15 constituting the pipe at the joint 14. Each branch pipe 15 is connected to a common main pipe 16 constituting a pipe.

  Further, the removal device has one end of the main pipe 16 as a closed end and the other end as an open end, and at the open end side, a groundwater recovery means 17 for recovering groundwater containing soil contaminants, and a gas of soil contaminants And a suction pump 19 for sucking groundwater and gas containing soil contaminants to the respective collecting means 17 and 18 side through pipes.

  The groundwater and gas recovery means 17 and 18 include processing means 17A and 18A for detoxifying the recovered groundwater and gas. In these processing means 17A and 18A, the process which makes the soil pollutant which is a liquid and gas harmless is performed by filtration using a filter or stirring and mixing with an additive, for example.

  In the soil pollutant removal apparatus having the above-described configuration, in the drain material 10 buried in the ground, the main material 11 serves as a filter, prevents inflow of earth and sand into the interior and allows groundwater to permeate inside. The permeated groundwater is sucked up by the thin tube 13. That is, groundwater containing soil pollutants rises in the narrow tubes 13, and when the soil pollutants are volatile organic compounds, the volatilized gas also rises in the narrow tubes 13.

  At this time, in the removal apparatus, it is possible to suck up groundwater and gas by capillary action in the thin tubes 13, but the suction pump 19 is operated and each thin tube 13 is connected via the pipe (main pipe 16, branch pipe 15). By sucking the inside of the water, groundwater and gas containing soil pollutants can be forcibly sucked, whereby the groundwater and gas can be removed and recovered, and the construction period can be shortened.

  Further, for example, a diaphragm pump can be used as the above-described suction pump 19. By simply applying a weak vacuum suction to the inside of the narrow tube 13 with this pump, the groundwater and gas permeated into the drain material 10 can be sucked without interruption. As a result, the groundwater is also concentrated in the shortest distance toward the drain material 10.

  In the removal apparatus, on the ground side, groundwater containing soil pollutants is collected in the groundwater collecting means 17, the groundwater is rendered harmless by the processing means 17 </ b> A, and the soil pollutant gas is collected in the gas collecting means 18. Then, the gas is rendered harmless by the processing means 18A.

  As described above, the soil pollutant removal method and the removal device described in the above embodiment do not require a large-scale excavation work, and pressurization with a loading embankment or sand mat used in the drain method or the like.・ Even drainage or atmospheric pressure methods such as airtight sheets that seal the ground surface and horizontal drain work are unnecessary, and even for ground G that contains clayey soil that is difficult to remove soil pollutants, drain material mainly in the ground It is possible to remove soil contaminants in the ground together with groundwater economically and efficiently only by burying 10, and it is possible to remove soil contaminants in a limited range.

  The above-described removal method and removal apparatus can precisely and centrally manage the groundwater and gas containing soil contaminants collected on the ground side in the groundwater and gas recovery means 17 and 18, and Since the groundwater and gas are rendered harmless by the processing means 17A and 18A of the recovery means 17 and 18, it can contribute to environmental protection and the like.

  In addition, the detailed configuration of the soil pollutant removal method and removal apparatus according to the present invention is not limited to the above-described embodiment, and the details of the drain material, each recovery means, and the treatment means may be changed as appropriate. Can do.

BRIEF DESCRIPTION OF THE DRAWINGS In one Example of the soil pollutant removal apparatus concerning this invention, it is sectional drawing (a) explaining the whole, the partial fracture | rupture side view (b), and sectional drawing (c) of a drain material.

Explanation of symbols

10 Drain material 13 Narrow pipe 15 Branch pipe (pipe)
16 Main pipe (piping)
17 Groundwater recovery means 17A Groundwater treatment means 18 Gas recovery means 18A Gas treatment means 19 Suction pump

Claims (5)

  When removing soil pollutants that have penetrated into the ground, a long drain material with a thin tube inserted along the longitudinal direction is used, and the drain material is buried in the ground along the vertical direction. A method for removing soil pollutants, characterized in that at least groundwater of groundwater and gas containing soil pollutants is collected on the ground side.   Narrow pipes are inserted along the longitudinal direction, and long-term drain materials buried in the ground along the vertical direction, and soil pollutants through pipes connected to the drain material narrow tubes buried in the ground. An apparatus for removing soil pollutants, comprising groundwater collecting means for collecting groundwater.   The apparatus for removing a soil pollutant according to claim 2, further comprising a gas recovery means for recovering a gas through a pipe connected to a drain pipe narrow pipe buried in the ground.   The apparatus for removing soil pollutants according to claim 3, further comprising a suction pump for sucking groundwater and gas containing soil pollutants to the respective collecting means side through pipes.   5. The apparatus for removing soil pollutants according to claim 3 or 4, wherein the groundwater and gas recovery means includes a processing means for detoxifying the recovered groundwater and gas.

Images