JP2003340436A - Semi-water permeable impervious plate with cleaning function, ground water cleaning structure, and contaminated ground water cleaning method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a semi-water permeable impervious plate with a cleaning function, which plate has functions of both of a water impermeable wall and a cleaning wall and can control three, i.e., cleaning, flow velocity and flow direction of contaminated ground water, a ground water cleaning structure disposed therewith in the ground and a cleaning method for the contaminated ground water using the same. <P>SOLUTION: The semi-water permeable impervious plate is annexed with a cleaning section 2 packed with cleaning materials 5 in a frame 6 in at least a portion of one surface 16 of a substrate 1, in which the impervious plate provided with a first aperture 3 for inflow or outflow of the ground water on the surface 15 of the substrate 1 facing the cleaning section 2 and provided with a second aperture 4 for inflow or outflow of the ground water in the frame 6 of the cleaning section 2 is built like a continuous wall into the ground. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semi-permeable impermeable plate with a purification function provided with an inflow port and an outflow port for groundwater, a groundwater purification structure in which this is placed underground, and contaminated groundwater using the same. Related to the purification method of.

[0002]

2. Description of the Related Art For example, volatile organic compounds such as trichlorethylene, which are used in large amounts in the cleaning process of semiconductor manufacturing factories, may contaminate soil or groundwater due to leaks, etc. There are problems such as obstacles to use and limited use of groundwater.

As a solution to this problem, the purification wall continuously arranged in the ground is made into a continuous column or an intermittent pile of a cylinder, and a cylindrical bag containing a metal reducing agent is stacked on the cylinder to form a metal reducing agent. A method for purifying contaminated groundwater that prevents separation and improves water permeability has been disclosed (Japanese Patent Laid-Open No. HEI-1).
1-156351). In addition, a water-permeable hollow wall is constructed to a depth that reaches the underground impermeable layer, and a purifying agent is detachably stored inside the wall to allow underground contaminated water to pass through the purifying agent. At the very least, there is disclosed a method for purifying contaminated groundwater in which the purifying agent can be replaced (JP-A-2-164936).

On the other hand, the problem of purification of contaminated groundwater is not only related to the purification technology as described above, but also related to the flow direction control technology of groundwater, such as changing the purification place to avoid structures such as houses adjacent to the pollution source. There is something. Conventionally, as a technique for controlling the flow direction of contaminated groundwater, a solidified pile that is created underground by mixing the raw ground and solidifying material, a soil cement wall, and a steel sheet pile that is installed by the underground water shield construction method. There are impermeable walls such as walls. Furthermore, the purification treatment technology of contaminated groundwater includes the problem of the flow velocity control technology of contaminated groundwater.

[0005]

However, JP-A-11-156351 and JP-A-2-164936.
The conventional groundwater purification wall as disclosed in Japanese Patent Publication, etc. solves the problem of purification of contaminated groundwater, and there is no disclosure of a technique for controlling the flow direction and flow velocity of contaminated groundwater. on the other hand,
Impermeable walls such as solidified piles and water shields are suitable for controlling the flow direction of contaminated groundwater, but are not intended for purification of contaminated groundwater. As a solution to the problems of purification of contaminated groundwater and flow direction control, a funnel gate method combining a purification wall and an impermeable wall has been proposed.
However, the funnel gate method can be applied only to a special place such as a valley in a mountainous area, and it is difficult to apply it to a section where factories and the like are lined up. Furthermore, it is necessary to construct the purification wall and the impermeable wall by separate construction methods, which complicates the process and is uneconomical. Therefore, in recent years, comprehensively studied purification technology, flow direction control technology, flow velocity control technology, etc. to elucidate the pollution mechanism,
It has been desired to develop a method for purifying contaminated groundwater that solves the above problems all at once.

Therefore, an object of the present invention is to provide a semi-permeable impermeable plate with a purifying function, which has the functions of both an impermeable wall and a purifying wall, and which makes it possible to purify contaminated groundwater and control the flow velocity and flow direction in three ways. An object of the present invention is to provide a groundwater purification structure in which this is arranged underground and a method for purifying contaminated groundwater using the same.

[0007]

Under the circumstances, as a result of intensive investigations by the present inventors, the contaminated groundwater was partially distributed to the water shield plate used in the conventional underground water shield plate construction method. The present invention has been completed based on the finding that it is possible to purify contaminated groundwater, and control three types of flow velocity and flow direction by providing a purification function while providing an opening enabling the above.

That is, the present invention (1) is a semi-permeable impermeable plate in which a purifying section in which a purifying material is filled in a frame is attached to at least a part of one surface of a substrate, and the semi-permeable impermeable plate is opposed to the purifying section. A second opening through which groundwater flows in or out of the frame body of the purification unit by providing a first opening on the surface of the substrate through which groundwater flows in or out.
A semi-permeable impermeable plate with a purifying function having an opening, and the present invention (2) is a semi-permeable impermeable plate in which a purifying portion in which a purifying material is filled in a frame is provided on both sides of a substrate and at least a part of both sides. A water plate, which forms a flow port on the surface of the substrate facing the purification unit, and provides a first opening for inflow or outflow of groundwater to the frame body of the purification unit located on one side of the substrate, A semipermeable water impervious plate with a purifying function, in which a second opening through which groundwater flows out or flows in is provided in a frame of the purifying section located on the other side of the substrate. The present invention (3) provides the first opening and the The arrangement position of the 2 openings is such that the opening through which the contaminated groundwater flows in is below the opening through which the groundwater flows out, the semipermeable water impervious plate with a purifying function,
The present invention (4) is the semipermeable water impervious plate with a purifying function, wherein the purifying unit is provided with a partition wall for increasing the residence time of groundwater in the purifying unit. The present invention (5) is the purifying unit. The water-permeable impermeable plate with a purification function, wherein the purification unit has at least one intermediate partition plate that blocks the flow of groundwater from each other in the up-down direction. A groundwater purification structure comprising a plurality of water-permeable and water-impervious plates connected laterally to form a continuous wall, the present invention (7) is provided.
The groundwater purification structure, which is provided by combining a water shield plate having no purification part, and the present invention (8) is a groundwater purification structure arranged so as to surround a pollution source, and the pollution source A groundwater purification structure comprising one or more semipermeable water blocking plates with a purification function on the downstream side of the present invention. The present invention (9) provides a purification section in which a purification material is filled in a frame on one surface of a substrate. A structure constructed by connecting a plurality of semi-permeable water-impervious plates attached to at least a part in a lateral direction to form a continuous wall is disposed downstream of the contaminated groundwater, and the contaminated groundwater is treated by the water-impervious plate. Flow through the first opening formed on the surface of the cleaning unit, stay in the cleaning unit for a predetermined time, and then flow out through the two openings formed on the frame of the cleaning unit.
Alternatively, the contaminated groundwater is allowed to flow in through two openings formed in the frame of the purification unit, stays in the purification unit for a predetermined time, and then flows out through the first opening formed in the surface of the water blocking plate. Purification method: The present invention (10) is a continuous wall-shaped construction in which a plurality of semi-permeable water-impervious plates, each having a purifying portion in which a purifying material is filled in a frame, are provided on both sides of a substrate, are connected in a lateral direction. Is disposed on the downstream side of the contaminated groundwater, the contaminated groundwater is caused to flow in through the first opening formed in the frame of the purification section on one side, and after remaining in the purification section for a predetermined time, purification on the other side is performed. Out of the two openings formed in the frame of the other part, or the contaminated groundwater is made to flow in from the two openings formed in the frame of the purification part on the other side, and after staying in the purification part for a predetermined time, the first Each of the methods for purifying dyed groundwater that flows out from the first opening formed in the frame of the purification section on the side Is shall.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a semipermeable / impermeable plate with a purifying function (hereinafter, also referred to as "semipermeable plate") according to a first embodiment of the present invention will be described with reference to FIG. . FIG. 1 is a schematic view showing a semi-permeable plate of the present embodiment with a part cut away. In FIG. 1, the semi-permeable plate 10a is a semi-permeable impermeable plate in which the purifying section 2 in which the purifying material 5 is filled in the frame 6 is attached to a part of the one surface 16 of the substrate 1. The first opening 3 through which groundwater flows in is provided on the other surface 15 of the substrate 1 facing the substrate 2, and the second opening 4 through which groundwater flows out is provided in the frame body 6 of the purification unit 2.

As the substrate 1 of the semi-permeable plate of the present invention, a so-called steel sheet pile which is conventionally used in the construction method of the underground water shield plate can be used. That is, a steel plate or a flexible synthetic resin sheet that exhibits rigidity even if it is thin is mainly used. For example, the effective width of the substrate 1 is about 1.5 m, and the effective length varies depending on the driving depth. Sheet body 11 having a thickness
And the lower grip 14 when setting in the penetration frame
And engaging portions 12 at both ends for engaging the adjacent semi-permeable plate,
Those having 13 are mentioned. Engaging portions 12, 1 at both ends
Examples of 3 include those in which one of the engaging male member and the engaging female member is welded to both sides in the vertical direction thereof.

The purifying section 2 attached to the one surface 16 of the semi-permeable plate 10a may be any one as long as the frame 6 is filled with the purifying material 5. For example, the upper side is open and the bottom side is the second side.
The bottomed box-shaped frame body 6 having the opening 4 is filled with the purifying material 5 in advance, and the upper open part of the bottomed box-shaped frame body 6 is directed to one surface of the substrate 1 so that they are aligned with each other. The abutting portion is attached by a fixing method such as welding, or two substrates having openings at predetermined positions are made to face each other with a predetermined gap, and the four side surfaces of the gap are separated from each other. Examples include those obtained by sealing with a member or the like and filling with a purifying material. Of these, the former method is preferable in that it can be freely designed in consideration of the pollution purification efficiency, the flow direction, and the flow velocity. The shape and size of the frame body 6 are not particularly limited and are appropriately determined depending on the purification conditions. As an example, the thickness of the frame 6 and the first opening 3 and the second opening 3 are set so that the residence time in the purifying unit 2 of the contaminated groundwater is 5 to 10 hours and the flow path length is 20 to 50 cm. The position of 4 may be appropriately determined.

The first opening 3 and the second opening 4 are not particularly limited as long as they are openings through which groundwater can flow in or out, and examples of the shape thereof include square, circular and elliptical shapes. . Alternatively, a large number of small openings may be formed. First opening 3 and second opening 4
A mesh-like screen 31 is attached to this to prevent the granular purification material filled in the frame 6 from leaking to the outside. The opening degree of the first opening 3 and the second opening 4 and the opening degree of the mesh screen 31 are appropriately determined so that a desired water flow rate can be obtained. Further, the installation positions of the first opening 3 and the second opening 4 are not particularly limited, and, for example, if the distance between the first opening 3 and the second opening 4 is long, the contaminated groundwater may be contained in the purification material. The residence time can be extended. Further, the positional relationship between the first opening 3 and the second opening 4 is not particularly limited, and, for example, if the opening into which the contaminated groundwater flows in is below the opening from which the groundwater flows out, the pollution concentration is usually high. Since the contaminated groundwater flows in the lower part of the aquifer, it is possible to efficiently purify the contaminated groundwater having a high concentration of pollution. In the semi-permeable plate 10a of this example, if the first opening 3 is arranged toward the upstream side of the flow of the contaminated groundwater, the first opening 3 becomes the inflow port of the contaminated groundwater and the second opening 4 becomes It serves as an outlet for purified groundwater. On the contrary, if the second opening 4 is arranged toward the upstream side of the contaminated groundwater flow, the second opening 4 serves as the contaminated groundwater inlet, and the first opening 3 serves as the purified groundwater outlet. Become.

Examples of the purification material 5 include a metal-based reducing agent, an adsorbent, and a biodegradable polymer, and these can be used alone or in combination of two or more. Examples of the metal-based reducing agent include iron or zinc metal powder, a wool-like material, or an alloy or compound powder thereof or a wool-like material. Of these, iron powder is preferable because it is inexpensive and can be discharged as waste. Activated carbon can be used as the adsorbent. Further, as the biodegradable polymer, a polymer containing activated carbon is preferable in that the activated carbon can form a permeable purification part even when the biodegradable polymer is decomposed by the physiological activity of a microorganism or the like. In addition, it is preferable to use these purification materials by mixing them with sand or gravel, if necessary, because separation of the purification material can be prevented and permeability can be maintained. The sand or gravel is not particularly limited, but includes natural soil such as medium sand, coarse sand, fine gravel, and medium gravel, and artificial crushed stone and crushed stone for general civil engineering, and one or more of these Can be used.

The semipermeable plate 10a is usually used as a groundwater purification structure in which a plurality of the semipermeable plates 10a are connected in the lateral direction to construct a continuous wall in the ground. As a method of penetrating the semipermeable plate 10a into the ground and a method of connecting a plurality of the semipermeable plates 10a in the lateral direction to construct a continuous wall, a known underground water shield construction method can be used. In the case of the present invention, the difference from the known method in the related art is that the purifying section 2 having a predetermined thickness is attached to one surface of the substrate 1 corresponding to the conventional water shield plate. Since it can be at most about 10 cm,
Resistance to penetration into the ground can be almost ignored, or
A method of injecting a semi-permeable plate 10a while injecting a pressure fluid from the lower end of a penetrating frame that is carried along in the ground, or a trench having a predetermined width is formed in the ground in advance, and the semi-permeable plate 10a is formed therein.
A method of incorporating a may be adopted.

Next, a semi-permeable plate according to the second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a schematic view showing a partially cutaway semi-permeable plate of the present embodiment. 2, the same components as those in FIG. 1 are designated by the same reference numerals, the description thereof will be omitted, and different points will be mainly described. That is, the semi-permeable plate 10b of the second embodiment.
In the above, the difference from the semi-permeable plate 10a of the first embodiment is that the purification unit 2 is made smaller, the first opening 3 is arranged above the second opening 4, and the purification unit 2 The purifying section 2 is divided into upper and lower parts in the center of the frame body 6, and a plate-like partition wall 7 is provided so that the flow passage 21 can be formed on the side farther from the first opening 3 and the second opening 4. According to the semipermeable plate 10b of the second embodiment, the presence of the partition wall 7 makes the contaminated groundwater purification unit 2 despite the fact that the purification unit 2 is smaller than the semipermeable plate 10a. The residence time inside can be equal to or longer than that of the semi-permeable plate 10a. The partition 7 is not limited to the configuration shown in FIG. 2 as long as it is installed in order to lengthen the residence time of groundwater in the purification unit 2.

In the semi-permeable plates 10a and 10b of the first and second embodiments, if the openings of the first opening 3 and the second opening 4 are made small, the water flow amount becomes small and the openings can be made large. If this happens, the amount of water flow will increase. Therefore, the water flow rate can be controlled by changing the opening degree of the first opening 3 and the second opening 4. Further, if the method of adjusting the installation positions of the first opening 3 and the second opening 4, the method of providing the partition wall 7 or the combination thereof is adopted, the residence time of groundwater in the purification unit 2 can be controlled. it can. In addition, the installation directions of the semipermeable plates 10a and 10b with respect to the streamline of the contaminated groundwater can be either orthogonal or inclined, and if the inclined installation is adopted, the semipermeable plate passes through the semipermeable plate. Do not change the flow direction of some contaminated groundwater.
It is possible to change the direction along 0a, 10b, that is, the installation direction. As described above, by using the semipermeable plates 10a and 10b of the first and second embodiments, it is possible to purify contaminated groundwater, control the flow velocity, and control the flow direction.

Further, as shown in FIG. 3, the groundwater purification structure 20a includes a known impermeable wall 10 which does not have a semipermeable plate 10a or 10b (hereinafter simply referred to as 10a) and a purification section.
It may be a structure in which 0s are combined, and in this case, if a large number of semipermeable plates 10a having openings are arranged, the amount of contaminated groundwater passing through increases, and the structure does not have openings. If a large number of permeable walls 100 are arranged, the amount of contaminated groundwater that passes through will decrease. Further, like the groundwater purification structure 20b in FIG. 4, the first opening 3 and the second opening 3 of the semipermeable plate 10a on the right side are provided.
If the opening degree of the opening 4 is small and the opening degree of the first opening 3 and the second opening 4 of the left semi-permeable plate 10a is large,
The amount of water flowing through the groundwater purification structure 20b can be controlled, and a flow direction component parallel to the installation direction can be generated in a state where the groundwater purification structure 20b is installed at a right angle to the contaminated groundwater streamline. . This flow direction control method is
A region 38 having a low water flow direction to a region 39 having a high water flow direction.
It utilizes the property of heading for. In this way, also in the continuous wall-shaped groundwater purification structure 20b, the semipermeable plate 1
0a and the impermeable wall 100 may be appropriately combined and the opening degree of the first opening 3 and the second opening 4 may be adjusted to control the flow rate of contaminated groundwater and the flow direction.

Next, a semi-permeable plate according to the third embodiment of the present invention will be described with reference to FIG. FIG. 5 (A) is a cross-sectional view of the semipermeable plate of the present embodiment in use,
(B) shows the figure seen along the II line of (A), respectively.
5, the same components as those in FIG. 1 are designated by the same reference numerals, the description thereof will be omitted, and different points will be mainly described.
That is, the semi-permeable plate 10c of the third embodiment differs from the semi-permeable plate 10a of the first embodiment in that an intermediate partition plate 8 that divides the inside of the purification unit 2 into upper and lower parts is provided. ,
The upper purifying part 2a and the lower purifying part 2b are provided, and the first opening 3 and the second opening 4 are provided respectively. The intermediate partition plate 8 is not particularly limited, and for example, a thin steel plate made of the same material as the substrate 1 and the frame body 6 can be used. As the ground on which the semi-permeable plate 10c is arranged, for example, FIG.
As shown in, the surface layer 51, the first
Aquifer 52, first impermeable layer 53, second aquifer 54, second
It consists of an impervious layer 55, a third aquifer 56 and a base 57,
The pollution source 58 is the ground existing in the first aquifer 52, the first impermeable layer 53, and the second aquifer 54. Semi-permeable plate 10c
The size of each member constituting the is determined in advance by a preliminary survey of the ground. That is, in the state where the semipermeable plate 10c is arranged in the ground, the upper purification section 2a is arranged in a section facing the first aquifer 52, and the lower purification section 2b is arranged in the second aquifer 5.
4, the intermediate partition plate 8 is arranged in a section facing the first water impermeable layer 53. Further, the upper end of the semi-permeable plate 10c is near the ground surface, and the lower end thereof is the second impermeable layer 55.
Located in each. Also in the semi-permeable plate 10c, the opening degree of the first and second openings can be changed and the installation position can be changed, as in the first and second embodiments, and the partition wall 7 can be installed. It is possible. According to such a semi-permeable plate 10c, the same effects as those of the first and second embodiments can be obtained, and the ground water flowing through one aquifer can be purified by the purifying unit 2.
When it passes through, it does not flow into other aquifers via the purification unit 2, and the contaminated groundwater of each aquifer is disposed in one semi-permeable plate 10c by the two purification units 2a and 2b. Can be individually purified. That is, when a semi-permeable plate without the intermediate partition plate 8 is used for the purification unit 2, there is a problem that contaminated groundwater flowing through the aquifer having a low pore water pressure is difficult to pass through the purification unit and is difficult to be purified. Without the intermediate partition plate 8, the purifying section 2 of the semipermeable plate connects the aquifers 52 and 54 to each other. For example, the upper first aquifer 52 having a high pore water pressure.
Although part of the contaminated groundwater of No. 2 passes through the purification unit 2 to be purified groundwater, the remaining groundwater flows into the lower second aquifer 54 with a low pore water pressure and is located in the second aquifer 54 portion. It will stay around the first opening 3 of the purification unit.
For this reason, the contaminated groundwater of the second aquifer 54 cannot smoothly pass through the first opening 3 of the purification unit 2, and a flow occurs in the direction along the semipermeable plate 10c, which makes it difficult to purify. Of. This phenomenon is the same when the lower second aquifer 54 has a higher pore water pressure than the upper first aquifer 52, and the contaminated groundwater of the first aquifer 52 having a low pore water pressure is not purified. Therefore, as in this example, the above problem can be solved by disposing the intermediate partition plate 8 in a section facing the water-impermeable layer. The semi-permeable plate 10c of this example
When penetrating into the ground, for example, the substrate 1 of the semi-permeable plate 10c
A gap may be formed between the first water-impermeable layer 53 and the first water-impermeable layer 53. At that time, the gap may be sealed by a known water-blocking method, for example.

Next, a semi-permeable plate according to the fourth embodiment of the present invention will be described with reference to FIG. FIG. 6 (A) is a cross-sectional view of the semipermeable plate of the present embodiment in use,
(B) shows the figure seen along the II-II line of (A), respectively. 6, the same components as those in FIG. 5 are designated by the same reference numerals, the description thereof will be omitted, and different points will be mainly described. That is, the semi-permeable plate 10d of the fourth embodiment.
In the above, the difference from the semi-permeable plate 10c of the third embodiment is that the purifying section 2c without the intermediate partition plate is installed at the position corresponding to the lower purifying section 2b, and the position corresponding to the upper purifying section 2a. The point is that an opening is provided on the screen and a screen 9 is installed. The screen 9 is not particularly limited as long as it has a structure that does not hinder the flow of uncontaminated groundwater in the first aquifer 52.
If the shape of the opening can be maintained, its installation can be omitted. That is, the ground on which the semi-permeable plate 10d of this example is arranged is the same as the ground shown in FIG. 5 except that the pollution source 58 exists in the second aquifer 54. That is, uncontaminated groundwater in the first aquifer 52 flows through the screen 9 as it is, and contaminated groundwater in the second aquifer 54 flows through the semipermeable plate 10.
It flows into the first opening 3 of d, passes through the inside of the purification material to be purified, and flows out from the second opening 4. Also in this semi-permeable plate 10d, the opening degree of the first and second openings can be changed and the installation position can be changed, as in the first and second embodiments, and the partition wall 7 can be installed. It is possible. According to such a semi-permeable plate 10d, the same effects as those of the first and second embodiments can be obtained, and the semi-permeable plate 10d can be applied to the ground where only the intermediate aquifer is contaminated.

A groundwater purification structure according to another embodiment of the present invention will be described with reference to FIG. FIG. 7 is a schematic view showing the usage state of the groundwater purification structure of this example, as seen from above. Since the semi-permeable plate of FIG. 7 is designed as appropriate according to the contaminated groundwater to be treated, the reference numeral 10
Was used (also in FIG. 8). Groundwater purification structure 2 of this example
0c is an example applied to the purification of contaminated groundwater having a wide pollution range such that the central part has a high pollution concentration and the pollution concentration decreases toward the outside. In the figure, arrows indicate the flow of groundwater. In the groundwater purification structure 20c, the semipermeable plate 10 of the present invention is arranged in a continuous wall shape at a portion orthogonal to the streamline of contaminated groundwater, and the conventional impermeable wall 10 is provided at both ends.
0 is arranged with a length H1. According to the groundwater purification structure 20c of the present example, it is possible to carry out contaminated groundwater having a wide pollution range in which the pollution concentration varies in the width direction under the optimum purification condition without taking the installation place. That is, in the semipermeable plate 10 for treating groundwater having a high pollution concentration in the central portion, the purification unit 2 and the opening area are both increased, and partition walls are installed to prolong the residence time of the contaminated groundwater in the purification unit 2. The structure should be such that it can be taken. On the other hand, the outer semi-permeable plate 10 for treating groundwater having a low pollutant concentration may have a small purification section, and may have a structure without a partition wall that prolongs the residence time of polluted groundwater. Conventionally, a funnel gate as shown in FIG. 13 has been applied to treat contaminated groundwater having a wide contamination range in which the contamination concentration differs in the width direction as in this example. In the funnel gate 200, a purification wall 100b is installed at the gate part, and the impermeable wall 10 is provided at the funnel part.
0a is a combination of high-concentration contaminated groundwater and low-concentration contaminated groundwater, which is the impervious wall 100 that is the funnel part.
It is a method of collecting by a and processing by the purification wall 100b of the gate part. This method has a problem that the amount of treated water on the purification wall 100b is large, so that the purification thickness W2 of the purification wall 100b is large. Furthermore, since all contaminated water is collected at the central gate portion, a large water surface gradient is required. Since it is necessary to secure it, the impermeable wall 100a which is the funnel part.
Has a large length (L). Therefore, the installation place has been widely taken and the construction cost has been increased. However, if the groundwater purification structure 20c of this example is adopted in place of the conventional funnel gate 200, the above problem can be solved without taking up a large installation space. In the groundwater purification structure 20c of this example, the impermeable walls 100 at both ends may be omitted.

A groundwater purification structure according to another embodiment of the present invention will be described with reference to FIGS. 8 and 9. FIG. 8 is a schematic view showing the usage state of the groundwater purification structure of the present example as seen from above, and FIG. 9 is a view taken along line III-III of FIG. The groundwater purification structure 20d of the present example is an application example in the case where the installation site such as the site 80 of the factory is restricted. The pollution source 58 is the site 8 of the factory where several factory buildings 81 are forested.
It purifies groundwater existing in the ground within 0 and contaminated by the pollution source 58. That is, the groundwater purification structure 20d of the present example is disposed in the ground from the passage 82 between the buildings 81 of the factory, and the semipermeable plate 10A at a position orthogonal to the streamline of contaminated groundwater is, for example, The purification unit 2 and the opening area are both increased, and a partition wall is installed so that the residence time of the contaminated groundwater in the purification unit can be long. On the other hand, semi-permeable water along the streamline of the contaminated groundwater. The purifying plate 10B may have a small purification portion and no partition. According to the groundwater purification structure 20d of this example,
Since it can be arranged in a straight line without taking the installation width, it can be applied even in a factory facility, which was difficult in the past.

A groundwater purification structure according to another embodiment of the present invention will be described with reference to FIG. FIG. 10 is a schematic view from above showing the usage state of the groundwater purification structure of this example. The groundwater purification structure 20e of this example is a pollution source 5
8 is an application example in which 8 is contained. That is, the groundwater purification structure 20e has a ring-shaped cross section and a pollution source 58 at the center thereof, and an impermeable wall 100 having a semi-ring cross section is arranged on the upstream side of the contaminated groundwater, and a plurality of semipermeable plates 10 are provided. A continuous wall-shaped structure with a semi-ring cross section is placed downstream of the contaminated groundwater. Conventionally, the containment of such a pollution source 58 has been carried out by a ring-shaped impermeable wall.
A slight leak of pollutants was unavoidable due to the dam-up phenomenon caused by the infiltration of rainwater. However, with the groundwater purification structure 20e of this example, since the pollutants are contained and the partially purified groundwater is transmitted, the dam-up phenomenon is unlikely to occur, and the pollutants are unlikely to leak. As the schematic shape of the groundwater purification structure 20e of the present example in plan view, in addition to the above ring shape, a rectangular ring shape, an indefinite shape and the like can be mentioned.

Further, the installation form of the substrate and the purification unit in the semi-permeable plate of the present invention is not limited to the above-described embodiment in which the single side is installed, and the purification unit is provided on both sides of the substrate and at least one of both sides. It may be attached to the section. Such a semi-permeable plate will be described with reference to FIG. Figure 11
[Fig. 3] is a schematic view of the semi-permeable plate of this example as seen from above. Figure 1
The semi-permeable plate 10e shown in FIG. 1 includes, for example, purifying parts 2d and 2e in which a purifying material is filled in a box-shaped frame with a bottom, and the open surface of the frame is on the side of the substrate 1 on both sides of the substrate 1, respectively. First, an unillustrated flow port is formed in the substrate 1 where the purification units 2d and 2e are arranged, and groundwater flows in and out of the frame of the purification unit 2d on one side. The opening 3 is provided, and the second opening 4 through which groundwater flows out or flows into the frame 2e of the purification unit on the other side. The semi-permeable plate 10e of this example can exhibit the same usage and similar effects as those of the above-described embodiment. Further, the semi-permeable plate 10f shown in FIG. 12 is attached to the substrate 1 so as to penetrate through the purifying section 2f in which the purifying material is filled in the frame body, and groundwater flows into or out of one side of the purifying section 2f. First to do
The opening 3 is provided, and the second opening 4 through which groundwater flows out or flows in is provided on the other side of the purification unit 2f. In addition, in FIG. 4, FIG. 11 and FIG. 12, the first opening 3 and the second opening 3
The opening 4 protrudes from the frame, but this is provided for the sake of convenience in order to clearly indicate the position or size, and in reality, it is often a form hollowed out in the frame.

Next, an example of the purifying action of the contaminated groundwater of the present invention will be described with reference to the semipermeable plate 10a of FIG. The groundwater flowing into the first opening 3 of the semipermeable plate 10a has, for example, a pH in a neutral range and a low oxidation-reduction potential.
The purification material 5 filled in the purification unit 2 is, for example, reducing metal powder. Contaminated groundwater flows in through the first opening 3
It stays in the purification unit 2 for a predetermined time until it flows out from the opening 4. At this time, for example, persistent halogenated hydrocarbons in the contaminated groundwater are dehalogenated in the purification unit 2 in the presence of the reducing metal powder and converted into harmless hydrocarbons, so that the contaminated groundwater is purified. To be done.

[0025]

By constructing a continuous wall-like groundwater purification structure by penetrating the semipermeable plate of the present invention into the ground, the semipermeable plate has the functions of both an impermeable wall and a purification wall. , The degree of opening of the first and second openings, the installation position, the residence time in the purification material, the arrangement direction of the contaminated groundwater with respect to the streamline, etc. can be freely designed, so that the control of the contaminated groundwater, the flow velocity and the flow direction can be controlled. Can be possible.

[Brief description of drawings]

FIG. 1 is a schematic view showing a partially cutaway semi-permeable impermeable plate according to a first embodiment of the present invention.

FIG. 2 is a schematic view showing a partially cutaway semi-permeable impermeable plate according to a second embodiment of the present invention.

FIG. 3 is a schematic view of the groundwater purification structure according to the first embodiment of the present invention as viewed from above.

FIG. 4 is a schematic view of a groundwater purification structure according to another embodiment as viewed from above.

FIG. 5 (A) is a schematic cross-sectional view of a semi-permeable impermeable plate according to a third embodiment of the present invention in use, and FIG.
It is the figure seen along the II line of (A).

FIG. 6 (A) is a schematic cross-sectional view of a semi-permeable impermeable plate according to a fourth embodiment of the present invention in use, and FIG.
It is the figure seen along the II-II line of (A).

FIG. 7 is a schematic cross-sectional view of a groundwater purification structure according to an embodiment of the present invention in use.

FIG. 8 is a schematic cross-sectional view of a groundwater purification structure in use according to another embodiment of the present invention.

9 is a view taken along line III-III in FIG.

FIG. 10 is a schematic cross-sectional view of a groundwater purification structure in use according to another embodiment of the present invention.

FIG. 11 is a schematic view of a semi-permeable impermeable plate as seen from above according to another embodiment of the present invention.

FIG. 12 is a schematic view of a semi-permeable impermeable plate as seen from above according to another embodiment of the present invention.

FIG. 13 is a schematic cross-sectional view of a conventional groundwater purification structure in use.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Substrate 2 Purification part 3 1st opening 4 2nd opening 5 Purification material 6 Frame 7 Partition 8 Intermediate partition 9 Screen 10, 10a-10d, 10A, 10B Semipermeable water impervious plate 11 with a purification function Sheet body Parts 12, 13 engaging parts 20a to 20e groundwater purification structure 51 surface layer 52 first aquifer 53 first impermeable layer 54 second impermeable layer 55 second impermeable layer 56 third impermeable layer 57 base 58 Pollution source 80 Factory premises 81 Factory building 82 Passageways 100, 100a Impermeable wall 100b Purification wall 200 Funnel gate

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masayoshi Shibuki             4-2-6 Kudankita, Chiyoda-ku, Tokyo             Quality Co., Ltd. (72) Inventor Hirohisa Yamaguchi             1-2-1 Taito, Taito-ku, Tokyo Fudo Construction Co., Ltd.             Inside the company (72) Inventor Tetsuji Sugiyama             1-2-1 Taito, Taito-ku, Tokyo Fudo Construction Co., Ltd.             Inside the company F-term (reference) 4D024 AA01 AB11 BA02 BC01 CA07                       DA03 DA05 DB22                 4D050 AA01 AB19 BA02 BD08 CA06

Claims (10)

[Claims] 1. A semi-permeable impermeable plate having a purifying portion filled with a purifying material in a frame on at least a part of one surface of a substrate, wherein groundwater is provided on the surface of the substrate facing the purifying portion. A semi-permeable impermeable plate with a purifying function, characterized in that a first opening through which water flows in or out is provided, and a second opening through which groundwater flows out or flows into the frame of the purifying section. 2. A semi-permeable impermeable plate in which a purifying section in which a purifying material is filled in a frame is provided on both sides of a substrate and at least a part of both sides, and the semicircular impermeable plate is distributed on the surface of the substrate facing the purifying section. A first opening through which groundwater flows in or out is formed in the frame of the purification unit located on one side of the substrate while forming the mouth, and groundwater flows out to the frame of the purification unit located on the other side of the substrate. Alternatively, a semipermeable water impervious plate with a purifying function, characterized in that it has a second opening for inflow. 3. The purification according to claim 1, wherein the arrangement positions of the first opening and the second opening are such that the opening through which the contaminated groundwater flows in is below the opening through which the groundwater flows out. Semi-permeable impermeable plate with functions. 4. The semipermeable water with a purifying function according to claim 1, wherein the purifying unit is provided with a partition wall for increasing the residence time of groundwater in the purifying unit. Water impermeable plate. 5. The purifying section is provided with one or more intermediate partition plates for blocking the mutual circulation of groundwater in the vertical direction in the purifying section. Semi-permeable water impervious plate with purification function. 6. Groundwater, characterized by comprising a plurality of semi-permeable impermeable plates with a purifying function according to any one of claims 1 to 5 which are connected in the lateral direction to form a continuous wall. Purification structure. 7. The groundwater purification structure according to claim 6, wherein a water shield plate having no purification unit is arranged in combination. 8. A groundwater purification structure which is arranged so as to surround a pollution source and which is downstream of the pollution source.
1 is a semi-permeable impermeable plate with a purifying function according to any one of 1.
A structure for purifying groundwater, characterized by being provided with one or more. 9. A continuous wall is constructed by connecting a plurality of semi-permeable water-impervious plates in which a purifying section in which a purifying material is filled in a frame is attached to at least a part of one surface of a substrate. Is disposed downstream of the contaminated groundwater, the contaminated groundwater is allowed to flow in through the first opening formed on the surface of the water blocking plate, and the contaminated groundwater is retained in the purifying unit for a predetermined time, and then the frame of the purifying unit is provided. It is allowed to flow out through the two openings formed in the body or the contaminated groundwater is caused to flow in through the two openings formed in the frame of the purification section, and after staying in the purification section for a predetermined time, the surface of the water shield plate is A method for purifying contaminated groundwater, which comprises flowing out from the formed first opening. 10. A structure constructed by constructing a continuous wall by connecting a plurality of semi-permeable water-impervious plates in which a purifying section in which a purifying material is filled in a frame body is provided on both sides of a substrate is contaminated. Arranged on the downstream side of the groundwater, the contaminated groundwater flows in from the first opening formed in the frame of the purification section on one side, stays in the purification section for a predetermined time, and then enters the frame of the purification section on the other side. The polluted groundwater is allowed to flow out through the two openings formed, or the contaminated groundwater is caused to flow through the two openings formed in the frame of the purification section on the other side, and after staying in the purification section for a predetermined time, the purification section of the one side is cleaned. A method for purifying contaminated groundwater, which comprises flowing out from a first opening formed in a frame.