JP2016168553A - Soil purification system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system capable of purifying the soil in an area directly under a building structure.SOLUTION: Injection means 2,... are arranged in parallel along one side of the purification area A1 directly under a building structure D. Lifting pipes 3,... are arranged in parallel along the other side of the area A1. A clarifier is injected from the injection means 2,..., while underground water is pumped up through the lifting pipes 3,.... An underground stream is thereby generated over the area from the injection means 2,... toward the lifting pipes 3,..., so that the clarifier penetrates and spreads into the purification area A1 together with the underground stream. As a result, the soil in the area A1 can be purified without arrangement of the injection means 2,... and the lifting pipes 3,... in the area A1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a soil purification system provided with injection means for injecting a purification agent into soil.

  Conventionally, various types of soil purification systems for purifying soil contaminated with VOC (volatile organic compound) have been proposed (see, for example, Patent Documents 1 and 2 and Non-Patent Document 1).

  FIG. 5 is a schematic diagram (side view) showing an example of a conventional configuration of a soil purification system, and reference numeral 102 denotes an injection means (sparging well) for injecting a liquid (nutrient brine) containing a nutrient source of microorganisms into the soil. The code | symbol 103 has shown the pumping well for pumping up groundwater. When the nutrient salt water is injected into the soil from the injection means 102, microorganisms living in the soil are activated and the pollutants are decomposed. The contaminated groundwater is pumped from the pumping well 103 by operating the pump 104 and sent to the water treatment device 106 via the water pipe 105.

Japanese Patent No. 4398699 Japanese Patent No. 3528120

Taisei Corporation, “Water Injection Biosparging Method”, [online], [Search February 17, 2015], Internet <http://www.taisei.co.jp/MungoBlobs/626/760/K00B90.pdf >

  By the way, in an area where a building (for example, a building or a building such as a factory, a house, a warehouse, or a tank) is constructed, the building itself becomes an obstacle, and the above-described injection means 102 and the pumping well 103 are underground. The soil purification system 101 shown in FIG. 5 cannot be used.

  The object of the present invention is to provide a soil purification system capable of solving the above-mentioned problems.

The invention according to claim 1 is illustrated in FIGS. 1 (a) and 1 (b), and the soil in the area immediately below the building (D) (see reference numeral A <b> 1. In soil purification system (1) to purify,
A plurality of injection means (2,...) Arranged in parallel on one side of the purification area (A1) so as to inject a purification agent into the soil;
A plurality of pumping pipes (3) having a pumping port (3b) at the tip portion (3a) and juxtaposed on the other side of the purification area (A1) with the tip portion (3a) buried in soil. ,…)When,
A pump (4) connected to the plurality of pumping pipes (3, ...) and configured to pump groundwater from the pumping port (3b);
With
When the row (B1) formed by juxtaposing the plurality of pumping pipes (3,...) Is a “pumping pipe row”,
The pumping pipes (3E,...) Arranged near the end (BE) of the pumping pipe row (B1) are the pumping pipes (3F,...) Arranged near the central part (BF) of the pumping pipe row (B1). ...) in comparison with the injection means (2, ...).

  The invention according to claim 2 is illustrated in FIG. 2 (a), and in the invention according to claim 1, the pumping pipe row (see symbol B <b> 2 of FIG. BE) has an arc shape such that the vicinity of the injection means (2,...) And the vicinity of the central portion (BF) are far from the injection means (2,...).

  The invention according to claim 3 is illustrated in FIGS. 2B to 2D, and in the invention according to claim 1 or 2, at the end (H) of the purification area (A1, A2). And when the part (H) close to the end part (BE) of the pumping pipe row (B1, B3, B4) presents a corner part, it is along the two sides forming the corner part (H). The pumping pipe (3E,...) Is arranged.

  The invention according to claim 4 is illustrated in FIG. 2 (a). In the invention according to any one of claims 1 to 3, the vicinity of the central portion (BF) of the pumping pipe row (B2) ) Is set to be smaller than the separation distance between the pumping pipes (3E,...) Near the end (BE) of the pumping pipe row (B2). It is characterized by that.

  Note that the numbers in parentheses are for the sake of convenience indicating the corresponding elements in the drawings, and therefore the present description is not limited to the descriptions on the drawings.

  According to the first to fourth aspects of the present invention, it is sufficient that the pumping pipe and the injection means are disposed outside the purification area, so that soil purification can be performed even in an area directly under the building.

Fig.1 (a) is a side view which shows an example of a structure of the soil purification system based on this invention, The same figure (b) is the top view. FIGS. 2A to 2D are plan views showing modifications of the arrangement of the pumping pipes and the like. 3A to 3C are schematic views for explaining the effect of the present invention. 4 (a) to 4 (e) are plan views showing modifications of the arrangement mode of the pumping pipe and the like. FIG. 5 is a schematic diagram (side view) showing an example of a conventional configuration of a soil purification system.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

The soil purification system according to the present invention purifies the soil in an area A1 immediately below the building D (hereinafter referred to as “purification area”) A1, as illustrated by reference numeral 1 in FIGS. And
・ In line with the side of the purification area A1 so as to inject the purification agent (oxidant, reducing agent, nutrient for microbial decomposition, microbial preparation, etc.) into the soil (outside the purification area A1). A plurality of injection means 2,.
In the vicinity of the tip portion (hereinafter referred to as “tip portion”) 3a having a water outlet (well point) 3b and the tip portion 3a embedded in the soil (outside the purification area A1) A plurality of pumping pipes 3,... Arranged side by side along the other side of the purification area A1, and
A pumping pump (vacuum pump) 4 connected to the plurality of pumping pipes 3 and configured to pump groundwater from the pumping port 3b;
It has. And by pumping up groundwater from the pumping port 3b of the pumping pipe 3 by the pumping pump 4, the purification area A1 is traversed from the side where the injection means 2 is arranged to the side where the pumping pipe 3 is arranged. Such a groundwater flow C is generated. As a result, the purification agent injected from the injection means 2 is diffused and penetrated into the purification area A1 by the groundwater flow C. In addition, the depth which embeds the said pumping hole 3b is good to be shallower than 5 m. The plurality of pumping pipes 3,... And the pumping pump 4 may be connected by a pipe member (head pipe) 5. Furthermore, it is preferable to connect a water treatment facility 6 to the pump 4 to purify the pumped ground water. Still further, the injection means 2 can be a known means such as an injection well.

  Here, when the row B1 formed by juxtaposing the plurality of pumping tubes 3,... Is referred to as a “pumping tube row”, the pumping tubes 3E disposed near the end BE of the pumping tube row B1. Are arranged closer to the injection means 2 than the pumping pipes 3F arranged in the vicinity of the central portion BF of the pumping pipe row B1 (that is, on the right side in FIG. 1B). It is good to do so. For example, as illustrated in FIG. 2A, the pumping pipe row B <b> 2 has an arc shape in which the vicinity of the end BE is close to the injection means 2 and the vicinity of the central portion BF is far from the injection means 2. It is good to do so. Further, as illustrated in FIGS. 7B to 7D, the portion H that is the end H of the purification areas A1 and A2 and is close to the end BE of the pumping pipe rows B1, B3, and B4 is a corner. When presenting the section, the pumping pipes 3E arranged in the vicinity of the ends BE of the pumping pipe rows B1, B3, B4 may be arranged along the two sides of the corner H. Hereinafter, these arrangement | positioning aspects are demonstrated.

<Arrangement mode of pumping pipe (1)>
Now, as illustrated in FIG. 3 (a), when the location 3 to be pumped is one location, the groundwater passing through the injection means 2 will flow to gather at the location 3 (see arrow C1). The purifier does not penetrate into the corner H of the purification area A1, and the soil at the corner H is not purified. In addition, the curve shown with the code | symbol G is an equal water level curve, and has shown that groundwater flows in the direction orthogonal to this equal water level curve. On the other hand, as illustrated in FIG. 2B, when the plurality of pumping pipes 3,... Are arranged in a line (on a straight line), groundwater flows in a relatively wide area (arrows). C2), the purifier does not penetrate into the corner H of the purification area A1, and the soil at the corner H is not purified. On the other hand, as illustrated in FIG. 5C, the pumping pipes 3E,... Near the end BE are close to the injection means 2, and the pumping pipes 3F,. When the pumping pipe row B4 is arranged so as to exhibit an arc shape as described above, the groundwater flows in a wider area (see arrow C3), and the purifier also enters the corner H of the purification area A1. Penetration and soil purification of the corner H are performed.

<Arrangement mode of pumping pipe (2)>
On the other hand, an end H of the purification area (see reference signs A1 and A2 in FIGS. 2B to 2D) and a portion H adjacent to the end BE of the pumping pipe rows B1, B3 and B4 are corners. , The pumping pipes 3E arranged in the vicinity of the ends BE of the pumping pipe rows B1, B3, B4 are preferably arranged along the two sides of the corner part H. When the present inventors confirmed by osmotic flow analysis, it turned out that a purification agent penetrate | invades also into the said corner | angular part H from the said some injection | pouring means 2, and the soil purification | cleaning of this corner | angular part H is performed effectively. .

  According to the present invention, the purification agent injected into the soil from the injection means 2,... Is carried to the purification area A1,... By the groundwater flow caused by the pumping pipes 3,. Then, the soil is permeated into the soil in the areas A1,. Moreover, since it is sufficient that the pumping pipes 3,... And the injection means 2,... Are arranged outside the purification area A1, ..., soil purification can be performed even in an area immediately below the building D.

<Interval for installing injection means>
By the way, if the water permeability of the soil in the purification areas A1,... Is substantially uniform, the injection means 2,... May be arranged at regular intervals, and the installation interval may be about 4-6 m. This is because the permeation range of the purifier injected from the injection means 2 is limited to a radius of about 2 to 3 m at the center of the injection means 2.

<Interval to install pumping pipe>
On the other hand, as illustrated in FIG. 2 (a), the distance between the pumping pipes 3F,... In the vicinity of the central part BF of the pumping pipe line B2 is the distance between the pumping pipes 3E,. It is good to set it so that it may become smaller than the distance between each other. In such a case, even if the distance between the pumping pipe 3F and the injection means 2 is long, the groundwater flow can be effectively flowed toward the vicinity of the central portion BF of the pumping pipe row B2. 4A, 4B, 4D, and 4E, it is preferable to increase the arrangement density of the pumping pipes 3 in the portion where the distance from the injection means 2 is long. If there is a portion with poor water permeability, the arrangement density of the pumping pipes 3 may be increased as indicated by the symbol K in FIG.

  In addition, it is good for the separation distance of the said pumping pipe 3 and the said injection | pouring means 2 to be within 20-30 m.

DESCRIPTION OF SYMBOLS 1 Soil purification system 2, ... Injection | pouring means 3, ... Pumping pipe 3a The tip part of a pumping pipe 3b Pumping port 3E, ... The pumping pipe 3F near the edge part of a pumping pipe line 3F, ... The pumping pipe 4 near the center part of a pumping pipe line 4 Pumping pump A1, ... Purification area B1, ... Pumping pipe row BE Near the end of the pumping pipe row BF Near the center of the pumping pipe row D Building H Corner of the purification area

Claims (4)

In a soil remediation system that purifies the soil in the area directly below the building (hereinafter referred to as the “remediation area”)
A plurality of injection means arranged on one side of the purification area so as to inject the purification agent into the soil;
A plurality of pumping pipes having a pumping port at the tip portion and juxtaposed on the other side of the purification area in a state where the tip portion is embedded in the soil;
A pumping pump coupled to the plurality of pumping pipes and configured to pump groundwater from the pumping port;
With
When a row formed by juxtaposing the plurality of pumping pipes is a “pumping water pump row”,
The pumping pipe arranged near the end of the pumping pipe row is arranged closer to the injection means than the pumping pipe arranged near the center of the pumping pipe row.
A soil purification system characterized by that. The pumping pipe row has an arc shape in which the vicinity of the end is close to the injection means and the vicinity of the center is away from the injection means.
The soil purification system of Claim 1 characterized by the above-mentioned. When the portion close to the end of the pumping pipe row at the end of the purification area presents a corner, the pumping pipe is arranged along two sides forming the corner,
The soil purification system of Claim 1 or 2 characterized by the above-mentioned. The separation distance between the pumping pipes near the center of the pumping pipe row was set to be smaller than the separation distance between the pumping pipes near the end of the pumping pipe row,
The soil purification system of any one of Claims 1 thru | or 3 characterized by the above-mentioned.