JP2002021465A - Contaminated groundwater collecting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contaminated groundwater collecting system which is formed under an improved collection well and carries out efficient collection of contaminated groundwater. SOLUTION: According to the contaminated groundwater collecting system 3, the collection well is arranged in a contaminated area 10 to collect groundwater. The groundwater is then transferred to a purifier to be rendered harmless, and thereafter drained. Collection of groundwater is carried out by the collection well consisting of vertical wells 1 and 2 dug at predetermined locations in the contaminated area, and horizontal wells 7 connected to the vertical wells and extending toward contaminated ground zones in the contaminated area. As a result, the contaminated ground water in a wide range is efficiently collected as planned, to thereby achieve detoxification treatment of the contaminated groundwater with high efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for collecting contaminated groundwater, and more particularly, to a system for collecting contaminated groundwater which is constructed under an improved water collection well to enable efficient pumping of contaminated groundwater. About the system.

[0002]

2. Description of the Related Art Land is occupying an important position as a carrier that supports plant production and buildings, as well as a person responsible for water purification and groundwater recharge, and always maintains a healthy state. It has been demanded.

[0003] In recent years, however, soil and groundwater contamination has been pointed out on land, and advanced techniques and experience have been required as a method for purifying these. Soil and groundwater pollution on land is caused by pollutants flowing out of tanks and penetrating the soil from waste landfills, and these substances can accumulate in unsaturated soil, By staying in the soil of the saturated layer or dissolving by penetrating into the groundwater, and accumulating at the top of the impermeable layer, the land is destroyed in the originally required healthy state, and even human health The situation has been adversely affected.

Among the pollutants, volatile organic compounds such as 1.1.1-trichloroethane, trichloroethylene, and tetrachloroethylene, and heavy metals such as cyanide compounds and hexavalent chromium have attracted attention as environmental standards. It penetrates into the saturated layer through the soil in the state, dissolves in the groundwater and diffuses in the flow direction, or is deposited at the upper end of the water-impermeable layer in a high concentration state. Treatment of groundwater has become important.

In the conventional groundwater treatment, as shown in a typical example in FIG. 4, groundwater 40 is pumped from a vertical well provided at the lower part of a contaminated area, and supplied to an aerator 42 by a pump 41 for aeration. In this way, groundwater is decontaminated.

The exhaust gas containing the pollutants generated at this time is transferred to a gas treatment device 44 by a blower 43 and subjected to activated carbon adsorption, heat desorption, and detoxification treatment by ultraviolet rays, and is exhausted 45 into the atmosphere.

[0007]

In these groundwater treatments, purifying devices such as aeration devices for treating groundwater have been substantially developed and improved as described above due to their active development. However, there is a problem to be solved regarding the pumping of groundwater to be treated.

That is, in the conventional pumping of groundwater, generally, a plurality of vertical wells are drilled in the ground of an area presumed to be contaminated to pump contaminated water. However, pumping from a highly permeable stratum is relatively easy, but pumping groundwater from a poorly permeable stratum is extremely difficult, and the pumped radius of pumped water is small. As a result of providing many vertical wells, the construction cost has increased and the construction period has been lengthened.

For this reason, there has been a demand for the development of a construction method capable of efficiently pumping contaminated groundwater from desired layers.

The present invention has been made in view of the above circumstances, and proposes to efficiently pump contaminated groundwater. The present invention is configured under an improved catchment well to provide efficient pumping of contaminated groundwater. It provides a contaminated groundwater collection system that enables it.

[0011]

The system for collecting contaminated groundwater according to the present invention basically comprises installing a collecting well in the ground of a contaminated area contaminated by volatile organic compounds and heavy metals to collect contaminated groundwater. A water collecting system for collecting contaminated groundwater, comprising a vertical well provided at a predetermined position in a polluted area, and a horizontal well connected to the vertical well and extending toward the contaminated area ground in the polluted area. Groundwater is collected by a collecting well, and more specifically, horizontal wells are set up and arranged at an arbitrary depth and direction of the wells, and are constructed to a predetermined length. The water is efficiently pumped along the route, and the detoxification of contaminated groundwater is achieved with high efficiency.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A contaminated groundwater collecting system according to the present invention comprises a standing well provided at a predetermined position in a contaminated area contaminated by volatile organic compounds and heavy metals, and a contaminated area connected to the standing well. The groundwater in the contaminated area is collected by a collection well consisting of a horizontal well extending toward the contaminated area inside the area.The water is transferred to a purification facility, detoxified, and then drained. The detoxification of groundwater has been made more efficient. An embodiment in which a pollutant is a volatile organic compound will be described below in detail with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of a contaminated groundwater collecting system according to the present invention.

The groundwater contaminated area 10 is provided with a plurality of vertical wells 1 and 2 in consideration of the degree of contamination and the flow of underground water. As will be described later, a plurality of horizontal wells 7 radially arranged to a predetermined direction and distance are connected to the vertical well, and the horizontal wells 7 are included in the soil of each layer.
Contaminated groundwater permeating through the river is collected in a vertical well.

The contaminated groundwater in the vertical well is pumped up by a pump (not shown) and transferred to a purification facility 3 installed on the ground. The groundwater is aerated in the purification facility 3 and drained. The generated polluted exhaust gas is exhausted to the atmosphere after being rendered harmless by a gas treatment device or the like.

FIG. 2 is a similar longitudinal sectional view mainly showing a vertical well according to the present invention. The vertical well 1 according to the present invention
It is excavated by the deep foundation method to have a predetermined diameter and an appropriate depth. In some cases, the vertical well 1 injects a backfill chemical into the ground other than the contaminated layer.
It is designed to collect only the target contaminated groundwater by preventing water leakage from the surrounding area.

In the hole wall 5 of the vertical well 1, a plurality of water collecting holes 6 are provided.
Is provided. The water collecting hole 6 determines the position in the depth direction in accordance with the distribution of groundwater contained in each layer and each layer such as an unsaturated layer and a saturated layer which constitute the ground of the contaminated area 10. The formation position in the circumferential direction is determined in accordance with the distribution state of the groundwater in the polluted area and the polluted state, and the extending direction of the horizontal well 7 to be connected at the same time is set.

A horizontal well 7 connected to the water collecting hole 6 and excavated so as to extend horizontally in a predetermined direction,
As shown in the cross-sectional view of FIG. 3, the strainer tube 8 is provided with a strainer tube 8 provided with pores or slits as a core material, and the periphery thereof is covered with a pressure-resistant drain 9.

The strainer pipe 8 is made of stainless steel. However, in addition to the stainless steel pipe, a steel pipe, a vinyl chloride pipe, or the like can be appropriately selected according to the target substance of groundwater contamination and its concentration. Since the pressure-resistant drain 9 is provided to stabilize the hole wall of the horizontal well and to prevent the strainer tube 8 from being clogged, a commercially available material having the same function is used. Can respond.

As a result, the contaminated groundwater 11 distributed in the ground easily penetrates into the laid horizontal well 7, flows easily along the horizontal well 7, and stands upright. Water is efficiently collected in wells 1 and 2.

Groundwater 11 collected in the vertical wells 1 and 2
Is pumped by the pump 12 and transferred to the purification facility 3.

The purification facility 3 is configured similarly to a conventional facility. Therefore, the groundwater 11 pumped by the pump 12
Is temporarily stored in the storage tank 13, but a predetermined processing amount is pumped up by the drainage pump 14 and the aeration device 15
Supplied to

The groundwater treated by the aeration device 15 is discharged to the outside of the facility as treated water. The exhaust gas containing pollutants generated from the contaminated groundwater is transferred to the gas treatment device 17 by the blower 16 and adsorbed by activated carbon. , Heated and desorbed, and rendered harmless by ultraviolet rays and exhausted to the atmosphere 18.

As described above, the water collecting system for contaminated groundwater according to the present invention has a collecting well provided at a predetermined position in the contaminated area, and connected to the standing well to form a contaminated area ground in the contaminated area. Horizontal wells that extend toward the ground, and the horizontal wells are arranged at arbitrary depths and directions of the wells and have a predetermined length, so the groundwater to be treated in the contaminated area can be collected reliably and easily. The efficiency of detoxification of contaminated groundwater has been improved.

As described above, the present invention has been described in detail based on the embodiments. However, the system for collecting contaminated groundwater according to the present invention is not limited to the above embodiments.
It goes without saying that various changes can be made to the construction method of each well, the shape of the well, and the specific structure of the treatment without departing from the spirit of the present invention.

[0026]

The contaminated groundwater collecting system according to the present invention is a contaminated groundwater collecting system for collecting groundwater by installing a collecting well in the ground of a contaminated area contaminated by volatile organic compounds and heavy metals. And collecting groundwater at a collecting well composed of a vertical well provided at a predetermined position in the contaminated area and a horizontal well connected to the vertical well and extending toward the contaminated area ground in the contaminated area. Horizontal wells are arranged at arbitrary depths and directions of the wells and are constructed to a predetermined length, so that a wide range of contaminated groundwater can be collected according to the plan. By collecting water accurately and efficiently, it has the effect of achieving highly efficient detoxification of contaminated groundwater.

[Brief description of the drawings]

FIG. 1 is a plan view showing a groundwater collecting system according to the present invention.

FIG. 2 is a partial longitudinal sectional view showing a groundwater collecting system according to the present invention.

FIG. 3 is a sectional view showing a horizontal well of the groundwater collecting system according to the present invention.

FIG. 4 is a schematic diagram showing a conventional groundwater collecting system.

[Explanation of symbols]

1, 2 vertical wells, 3 purification facilities, 5 hole walls, 6
Drainage hole, 7 horizontal well, 8 strainer tube, 9 pressure-resistant drain, 10 polluted area, 11 groundwater, 12
Pumps, 13 storage tanks, 14 drainage pumps, 1
5 aeration device, 16 blower, 17 gas treatment device, 18 exhaust, 40 groundwater, 41 pump,
42 aeration device, 43 blower, 44 gas treatment device, 45 exhaust,

Claims (2)

[Claims] 1. A contaminated groundwater collecting system for collecting contaminated groundwater by providing a collecting well in the ground of a contaminated area, comprising: a standing well provided at a predetermined position in the contaminated area; A contaminated groundwater collecting system, wherein contaminated groundwater is collected by a collecting well composed of a horizontal well extending to the contaminated area ground in the contaminated area. 2. The system for collecting contaminated groundwater according to claim 1, wherein the horizontal wells are arranged at a predetermined depth and direction of the vertical well and have a predetermined length.