KR102604316B1 - Installation facilities of permeable reactive barriers through hybrid groundwater flow control - Google Patents

Abstract

A permeable reactive wall installation facility using hybrid groundwater flow control to reduce contaminated groundwater through groundwater flow control is disclosed. The facility for installing a permeable reactive wall through hybrid groundwater flow control includes a cutoff wall installed underground in consideration of geological distribution characteristics and groundwater flow direction; A gravel layer disposed at the beginning of an inflow path through which untreated groundwater captured by the water barrier flows in; A water-permeable reactive material layer disposed at the rear end of the gravel layer based on the inflow path; and a drainage device disposed at the rear end of the permeable reactive material layer based on the inflow path to monitor contaminants by controlling the flow rate and water level of groundwater in the permeable reactive material layer. Accordingly, a drainage device is created at the rear of the permeable reactive wall to induce groundwater convergence flow in parallel with the water barrier wall, and by adjusting the groundwater level discharged by the drainage device to control the groundwater outflow flow rate, groundwater contaminated with oil or heavy metals, etc. Since it can be guided to one place, the efficiency of groundwater purification can be increased.

Description

Permeable reactive wall installation facility through hybrid groundwater flow control {INSTALLATION FACILITIES OF PERMEABLE REACTIVE BARRIERS THROUGH HYBRID GROUNDWATER FLOW CONTROL}

The present invention relates to a permeable reactive wall installation facility through hybrid groundwater flow control, and more specifically, to a permeable reactive wall installation facility through hybrid groundwater flow control to reduce contaminated groundwater through groundwater flow control. .

Water barrier systems, which are generally installed underground, are very useful in the purification of contaminated sites, but in many countries, they have been used as a temporary method to prevent the spread of pollutants until purification begins at the contaminated site.

Purification of some highly persistent contaminants may require a lot of money, and the application of economical purification technologies is inevitable, and in addition, executing a purification program often involves complex legal management processes. Therefore, sites in the process of being managed remain uncleaned for a long time, increasing the likelihood of contaminants migrating into the environment in which we live.

Korean Patent No. 10-0414194 (announced on January 7, 2004) (modularization of reactive materials applied to reactive walls and its device) Korean Patent No. 10-1065274 (2011. 09. 16., Announcement) (Method for treatment of leachate from livestock burial site using permeable reactive wall, removal of odor and prevention of groundwater contamination)

Accordingly, the technical problem of the present invention is focused on this point, and the purpose of the present invention is to use a cutoff wall and an artificial drainage device to control groundwater flow in a contaminated site where groundwater is contaminated with oil or heavy metals and there are buildings on top. It provides a permeable reactive wall installation facility through hybrid groundwater flow control designed to direct contaminated groundwater to one location.

In order to realize the object of the present invention described above, a permeable reactive wall installation facility through hybrid groundwater flow control according to an embodiment includes a cutoff wall installed in the ground in consideration of geological distribution characteristics and groundwater flow direction; A gravel layer disposed at the beginning of an inflow path through which untreated groundwater captured by the water barrier flows in; a water-permeable reactant layer disposed at a rear end of the gravel layer based on the inflow path and configured to treat organic substances contained in contaminated groundwater primarily filtered by the gravel layer; In order to monitor contaminants by controlling the flow rate and water level of groundwater in the permeable reactive material layer, an overflow wall is placed at the rear end of the permeable reactive material layer based on the inflow path to maintain the planned water level. , a pumping facility including a pump and a pump installed to artificially control the amount of pumped water in the downstream section, and a drainage system including a drainage facility installed to control the flow rate with a natural flow method; A water level detection sensor that detects the level of contaminated groundwater contained in the drainage device; a contamination detection sensor that detects the degree of contamination of contaminated groundwater accommodated in the drainage device; A valve for a drainage facility provided in the drainage facility to drain contaminated groundwater; and connected to the water level detection sensor, the water pump, and the drainage valve, to handle the operation of the water pumping and drainage facilities according to the concentration of contamination or when it is necessary to adjust the residence time between the contaminated groundwater and the reactive material, (i) If the water level detected by the water level detection sensor exceeds the critical water level and the contamination level detected by the contamination detection sensor is checked to be greater than the contamination threshold, the pumping pump is configured to process the pumped water and re-inject it into the tip of the water-permeable reactive material layer. controls the operation, and (ii) when the water level detected by the water level detection sensor exceeds the critical water level and the pollution level detected by the pollution detection sensor is checked to be not greater than the pollution threshold, through the drainage facility in a natural flow manner. It includes a control unit that controls the operation of the drainage valve to drain contaminated groundwater.

In one embodiment, the water barrier may be installed underground to bypass buildings within the site.

In one embodiment, the drainage device may include a pumping well installed to improve flow control performance in the lower part of the aquifer.

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In one embodiment, the location of the cutoff wall may be selected by using a hydrogeological groundwater model and MODFLOW particle tracking.

According to this hybrid groundwater flow control-based permeable reactive wall installation facility, a drainage device is created at the rear of the permeable reactive wall to induce groundwater convergence flow in parallel with the cutoff wall, and the groundwater level discharged by the drainage device is controlled to increase the groundwater outflow flow rate. By controlling, groundwater contaminated with oil or heavy metals can be directed to one place, thereby increasing the efficiency of groundwater purification.

Figure 1 is a plan view illustrating a permeable reactive wall installation facility through hybrid groundwater flow control according to an embodiment of the present invention.
FIG. 2 is a perspective view schematically illustrating the permeable reactive wall shown in FIG. 1.
FIG. 3 is a block diagram illustrating a permeable reactive wall installation facility through hybrid groundwater flow control shown in FIG. 1.
FIG. 4 is a flowchart for explaining the operation of the control unit shown in FIG. 3.

Hereinafter, the present invention will be described in more detail with reference to the attached drawings. Since the present invention can be subject to various changes and have various forms, specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

While describing each drawing, similar reference numerals are used for similar components. In the attached drawings, the dimensions of the structures are enlarged from the actual size for clarity of the present invention.

Terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, a first component may be referred to as a second component without departing from the scope of the present invention, and similarly, the second component may also be referred to as a first component. Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Additionally, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless explicitly defined in the present application, should not be interpreted in an ideal or excessively formal sense. No.

Figure 1 is a plan view illustrating a permeable reactive wall installation facility through hybrid groundwater flow control according to an embodiment of the present invention.

Referring to FIG. 1, a permeable reactive wall installation facility through hybrid groundwater flow control according to an embodiment of the present invention includes a permeable reactive wall 120 including a water cutoff wall 110 and an artificial drainage device, After the pollution status of the target area is reviewed, it is installed in the selected pollution source reduction target area. In this embodiment, a method of controlling the flow of contaminated groundwater through the cutoff wall 110 and aggravating the flow control of the contaminated groundwater through an artificial drainage device is adopted, so it is called hybrid groundwater flow control.

The cutoff wall 110 is installed in the ground to be guided to a permeable reactive wall within the site, taking into account geological distribution characteristics and groundwater flow direction. The water barrier 110 may be installed in an area between adjacent buildings depending on the material and installation depth plan considering watertightness. In other words, the water barrier 110 can be installed underground to bypass buildings within the site.

The cutoff wall 110 may be formed to define an overall V-shape on both sides of the permeable reaction wall 120 when observed on a plane. Of course, since the barrier wall 110 is installed in the area between buildings, the barrier wall 110 may be straight, curved, or zigzag.

The cutoff wall 110 installed in this way guides the movement path of underground contaminants (groundwater contamination clouds) so that they reach the permeable reactive wall 120 according to the groundwater flow. That is, the cutoff wall 110 installed using hydraulic flow in the groundwater-contaminated aquifer section blocks the groundwater flow and guides the groundwater flow to one place, that is, the permeable reactive wall 120.

The permeable reactive wall 120 is installed to connect the cutoff walls 110 installed on both sides corresponding to the end of the groundwater flow direction. The groundwater contaminant clouds that arrive at the path guided by the cutoff wall 110 are treated with contaminants as they pass through the permeable reactive wall 120, and are removed, immobilized, and transformed using chemical, biological, and physical methods. This permeable reactive wall 120 does not block the flow of groundwater but performs a function of purifying contaminants. The contamination purification method using the permeable reactive wall 120 is cost-effective because it uses the natural flow of groundwater. The permeable reactive wall 120 is a restoration technique that purifies groundwater contamination over a long period of time.

According to the present invention, a target area for installing a permeable reactive wall installation facility through hybrid groundwater flow control is selected through review of the cutoff wall 110 and reactive materials for groundwater flow control in consideration of site conditions. That is, the location of the structure in the contaminated site, the status of the stratum, the scope and scale of the groundwater contamination cloud, etc. are reviewed to select the barrier wall 110, and the reactive substances are reviewed, and then the pollutant reduction target area is selected.

After the above-mentioned target area is selected, that is, a permeable reactive wall installation facility is constructed through hybrid groundwater flow control to guide the permeable reactive wall within the selected site considering the geological distribution characteristics and groundwater flow direction. For purification of contaminated groundwater, the direction and flow rate of groundwater flow over time are important, and the efficiency of purification can be increased through flow control.

The positioning of the cutoff wall 110 and the permeable reactive wall 120 of the permeable reactive wall installation facility through the hybrid groundwater flow control can be done through a hydrogeological groundwater model - modflow particle tracking. . That is, the movement path of contaminants is predicted using a groundwater modeling program based on field data, and the optimal location of the cutoff wall 110 and the permeable reaction wall 120 are selected based on the results. Installation of the above-described cutoff wall 110 can begin from the main source of contamination and utilize the excavation space for soil contamination. In other words, when excavating contaminated soil, the above-mentioned cutoff wall 110 can be installed using the excavation surface.

After the construction of the permeable reactive wall installation facility through hybrid groundwater flow control including the cutoff wall 110 and the permeable reactive wall 120 is completed, permeability reaction through hybrid groundwater flow control based on the replacement cycle for each reactant. Operates and maintains wall installation facilities.

FIG. 2 is a perspective view schematically illustrating the permeable reactive wall 120 shown in FIG. 1.

1 and 2, the permeable reactive wall 120 includes a gravel layer 122, a permeable reactive material layer 124, and a drainage device 126.

The gravel layer 122 is placed at the beginning of the inflow path through which contaminated groundwater flows. The gravel layer 122 improves permeability and induces the flow of groundwater.

The water-permeable reactant layer 124 is disposed at the rear end of the gravel layer 122 based on the inlet path. The permeable reactant layer 124 may be disposed at the rear end of the gravel layer 122 and may be configured to treat organic substances contained in contaminated groundwater that has been primarily filtered by the gravel layer 122. That is, the process of treating odor, NH4-N, and organic substances contained in contaminated groundwater can be performed by the permeable reactive material layer 124. For example, the water-permeable reactant layer 124 may be manufactured in a pack form using a frame made of a mixture of DS-BB, charcoal or activated carbon, rice husk, sawdust, and minerals. Additionally, the permeable reactive material layer 124 may be configured to additionally remove NO3-N and residual organic substances contained in the contaminated groundwater that has undergone the primary treatment process and perform sterilization treatment. For example, the water-permeable reactive material layer 124 may be manufactured in the form of a pack using a frame of a mixture of zero valent iron, steelmaking slag, and waste tire flakes.

The drainage device 126 is installed at the rear end of the permeable reactive material layer 124 based on the inflow path to monitor contaminants by controlling the groundwater flow rate and water level in the permeable reactive material layer 124. is placed in

Additionally, the drainage device 126 may include a pumping well installed to improve flow control performance in the lower part of the aquifer.

Additionally, the drainage device 126 may include a pumping facility including a pump and a pump installed to artificially control the amount of pumped water in the downstream section. The pumping well may be placed in a region far from the water-permeable reactant layer 124. An overflow wall may be disposed between the water-permeable reactant layer 124 and the pumping well.

Additionally, the drainage device 126 may include a drainage facility installed to control the flow rate along with a natural flow method. The drainage facility may include a drain pipe, a drain valve, etc.

According to this embodiment, a gravel layer 122 is installed at the beginning of the inflow path through which contaminated groundwater flows, and a permeable reactive material layer 124 according to the contaminant is installed at the rear end of the gravel layer 122 to remove the contaminants. Reduce efficiently. In other words, by installing the gravel layer 122, groundwater flow and flow rate in the target area can be efficiently managed. It is desirable to select reactants effectively according to the contaminants.

In addition, a drainage device 126 including a pumping well and a drainage facility is installed at the lowest part of the permeable reactive wall 120 to control the groundwater flow rate and water level in the permeable reactive material layer 124 and to control contaminants. Carry out monitoring. Pumping and drainage facility operating conditions are operated when it is necessary to control the residence time between contaminated groundwater and reactive substances. In other words, it is desirable to set operating conditions according to the pollution concentration.

When simply constructing the cutoff wall 110, there is a disadvantage that a vertical flow of contaminated groundwater may occur and the contaminated groundwater may leak into the lower part of the cutoff wall 110. However, in the present invention, the contaminated groundwater is converged in the direction of the permeable reactive wall 120 and the contaminated groundwater is drained through the drainage device 126 of the permeable reactive wall 120, so that the contaminated groundwater is It is possible to prevent vertical flow from occurring due to stagnation at the end of the water barrier 110.

FIG. 3 is a block diagram illustrating a permeable reactive wall installation facility through hybrid groundwater flow control shown in FIG. 1.

Referring to Figures 1 to 3, the permeable reactive wall installation facility through hybrid groundwater flow control includes a water level detection sensor 130, a contamination detection sensor 140, a water pump 150, a drainage valve 160, and a control unit. It further includes (170).

The water level detection sensor 130 detects the water level of contaminated groundwater accommodated in the drainage device 126, for example, groundwater contaminated by the permeable reactive material layer 124, and sends the detected water level signal to the control unit 170. provided to.

The contamination detection sensor 140 detects the degree of contamination of contaminated groundwater accommodated in the drainage device 126, for example, groundwater contaminated by the permeable reactive material layer 124, and sends the detected contamination signal to the control unit 170. ) is provided.

The pump 150 pumps and treats contaminated groundwater received in the drainage device 126 under the control of the control unit 170 through a pumping well disposed in the drainage device 126. The water pump 150 may be placed at the bottom of the drainage device 126 or may be placed outside of the drainage device 126.

The drainage valve 160 is provided in the drainage facility and drains contaminated groundwater received in the drainage device 126 under the control of the control unit 170 or the manager.

The control unit 170 is connected to the water level detection sensor 130, the contamination detection sensor 140, the water pump 150, and the drainage valve 160, and adjusts the residence time between the contaminated groundwater and the reactive material according to the concentration of contamination. Operate pumping and drainage facilities when necessary.

Specifically, when the control unit 170 checks that the water level detected by the water level detection sensor 130 exceeds the threshold level and the contamination value detected by the contamination detection sensor 140 is greater than the contamination threshold, the contamination treatment is performed. The operation of the pump 150 is controlled to pump and process groundwater and reinject it into the front end of the permeable reaction wall, that is, the front end of the groundwater flow.

In addition, if the control unit 170 checks that the water level detected by the water level detection sensor 130 exceeds the critical water level and the contamination value detected by the contamination detection sensor 140 is not greater than the contamination threshold, the contaminated groundwater The operation of the drainage valve 160 is controlled to drain the water through the drainage system in a natural flow manner.

FIG. 4 is a flowchart for explaining the operation of the control unit 170 shown in FIG. 3.

Referring to FIGS. 1 to 4 , the level of groundwater contained within the drainage device 126 is detected using the water level detection sensor 130 disposed within the drainage device (step S110).

Next, the degree of groundwater contamination within the drainage device 126 is detected using the contamination detection sensor 140 disposed within the drainage device 126 (step S120). Here, it is exemplified that the level of groundwater is detected and then the level of groundwater contamination is detected, but the order may be changed and may be performed simultaneously.

The control unit 170 checks whether the groundwater level detected by the water level detection sensor 130 is higher than the critical water level (step S130).

If it is checked that the groundwater level detected in step S130 is not higher than the critical water level, the control is fed back to step S110 to detect the groundwater level.

If the groundwater level detected in step S130 is checked to be higher than the threshold level, the control unit 170 checks whether the contamination level detected by the contamination detection sensor 140 is greater than the contamination threshold (step S140).

If it is checked in step S140 that the contamination value is greater than the contamination threshold, the control unit 170 controls the pumping of the contaminated groundwater and reinjection into the front end of the permeable reactive wall 120, that is, the front end of the groundwater flow (step S150), it is fed back to step S110 and controlled to detect the groundwater level.

If it is checked that the contamination level is not greater than the contamination threshold, the control unit 170 controls the contaminated groundwater to be drained through a drainage facility in a natural flow method (step S160), and then feeds back to step S110 to detect the groundwater level. Control.

As explained above, according to the present invention, a water barrier wall is constructed to bypass the building within a site selected in consideration of geological distribution characteristics and groundwater flow direction, and a permeable reactive wall installation facility is constructed through hybrid groundwater flow control. By doing so, even within the site where buildings are located, contaminated groundwater can be directed to one place using a cutoff wall to control groundwater flow, thereby increasing the efficiency of purification.

Although the above has been described with reference to examples, those skilled in the art can make various modifications and changes to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand.

110: water blocking wall 120: permeable reaction wall
122: Gravel layer 124: Permeable reactive material layer
126: Drainage device 130: Water level detection sensor
140: Pollution detection sensor 150: Pumping pump
160: Valve for drainage facility 170: Control unit

Claims (9)

A barrier wall installed underground in consideration of the geological distribution characteristics and groundwater flow direction, and in accordance with the material and installation depth plan considering watertightness, to bypass the area between adjacent buildings, that is, buildings within the site;
A gravel layer disposed at the beginning of an inflow path through which untreated groundwater captured by the water barrier flows in;
a water-permeable reactant layer disposed at a rear end of the gravel layer based on the inflow path and configured to treat organic substances contained in contaminated groundwater primarily filtered by the gravel layer;
In order to monitor contaminants by controlling the flow rate and water level of groundwater in the permeable reactive material layer, an overflow wall is placed at the rear end of the permeable reactive material layer based on the inflow path to maintain the planned water level. , a pumping facility including a pump and a pump installed to artificially control the amount of pumped water in the downstream section, and a drainage system including a drainage facility installed to control the flow rate with a natural flow method;
A water level detection sensor that detects the level of contaminated groundwater contained in the drainage device;
a contamination detection sensor that detects the degree of contamination of contaminated groundwater accommodated in the drainage device;
A valve for a drainage facility provided in the drainage facility to drain contaminated groundwater; and
It is connected to the water level detection sensor, the pollution detection sensor, the pump, and the drainage valve, and handles the operation of the pumping and drainage facilities when it is necessary to adjust the residence time between the contaminated groundwater and the reactant according to the concentration of contamination,
(i) If the water level detected by the water level detection sensor exceeds a threshold water level and the contamination level detected by the contamination detection sensor is checked to be greater than the contamination threshold, retention of the contaminated groundwater within the permeable reactive material layer To extend the time, controlling the operation of the pump to pump the contaminated groundwater and reinject it into the tip of the water-permeable reactant layer,
(ii) If the water level detected by the water level detection sensor exceeds the critical water level and the contamination level detected by the contamination detection sensor is checked to be not greater than the contamination threshold value, the contaminated groundwater is naturally flowing through the drainage system. It includes a control unit that controls the operation of the drainage valve to drain water through,
Hybrid groundwater flow control is defined as controlling the flow of contaminated groundwater through the cutoff wall and aggravating the flow control of contaminated groundwater through the drainage device. Installing a permeable reactive wall through hybrid groundwater flow control. facility.
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