KR100377911B1 - Integrated treatment facilities for remediation of mobile contaminants of soil and groundwater by the direction of flowpath, and it's installation metnod - Google Patents

Abstract

The present invention is to guide the groundwater flow path to effectively recover and remove the ground fluid pollutants including soil layer and groundwater layer to prevent and treat the spread of oil pollutants due to groundwater behavior by physical, chemical and microbiological action The present invention relates to an integrated flow path induced pollution treatment device and a method for installing the same, and includes a rod or a circle for injecting fine air into the trench bottom after excavating a trench at a predetermined depth at the site interface where soil contamination is to be prevented. Install the diffuser horizontally and vertically install the double or single piped perforated pipe at regular intervals above the diffuser, and lay the impermeable and solvent-resistant flat resin film vertically out of the boundary and the particle size therebetween. Filling a variety of irregularly littered or similar solids In this case, the permeable structure (hereinafter referred to as a flow-induced porous trench) is installed in the ground, and in the permeable structure, a fluid contaminant which is naturally or forcibly phased and floated to the upper part of the groundwater is connected to an appropriate pump. By selectively recovering the fluid into the liquid phase through the inner tube and injecting micro air into the diffuser, the pollutant dissolved in the groundwater introduced into the trench is volatilized and collected in a gaseous state or promoted the growth of the biological group with the injection of nutrient solution. It is to provide an integrated facility and apparatus for recovering and removing pollutants in liquid and gaseous phases behaving along the groundwater by oxidizing and decomposing the treated groundwater into the flow path at the bottom of the flat plate membrane.

As described above, when the pollutant existing in the soil layer moves along the groundwater, the pollutant collected in the trench structure is physically separated from the liquid phase and the gas phase to be selectively removed by a ground recovery device, and the pollutant present in the soil by microorganisms. Anti-forced treatment prevents the spread of harmful pollutants along the groundwater, and does not alter the groundwater flow and flows naturally without blockage through the same flow path, so as not to destroy the underground ecological environment of the adjacent area. There is a characteristic.

Description

INTEGRATED TREATMENT FACILITIES FOR REMEDIATION OF MOBILE CONTAMINANTS OF SOIL AND GROUNDWATER BY THE DIRECTION OF FLOWPATH, AND IT'S INSTALLATION METNOD}

The present invention relates to an integrated flow path induced pollution treatment apparatus and a method of installing the same for preventing and treating the spread of oil pollutants caused by groundwater behavior.

In general, when excavating soil around a workplace that handles chemicals or a facility that stores oil and chemicals, various pollutants from the excavated soil layer were used as process inputs in the workplace or stored in the form of raw materials and products. There are many cases where soils are absorbed into the ground by leaks or spills over a long period of time and are found contaminated.

Pollutants from these soil layers are discharged from ground transport or underground storage facilities to ground or underground layers over time, reaching the saturated zone through the unsaturated zone of the soil layer, and the pollutants leaked or leaked according to the groundwater behavior of the saturated zone. It is common to spread widely from a point and contaminate the surrounding site.

Such contaminated soil is found during excavation construction or when soil pollution is investigated in the site, and the contaminated source is removed or treated with contaminated soil to prevent further spread according to the Waste Act and the Soil Environment Conservation Act. It must be done.

In the purification method for the treatment of the contaminated soil, various techniques such as bio purification, natural purification, and physical removal have been proposed, and show a lot of difference in cost and treatment period depending on the application method. Of these various polluted soil purification methods, it is desirable to treat the contaminated soil directly on site for areas with relatively large contaminated areas, and at this time, enormous resources are required for the disposal cost, which leads to the deterioration of the underground ecological environment. In particular, pollutants found in soil layers are generally excavated and treated as waste, and excavating contaminated soils is most appropriate and timely reasonable when applied if the contaminant is present locally within the limited extent of the soil layer. It is evaluated by the method.

In Korea, the four seasons are distinctive, and the amount of groundwater fluctuates seasonally, and it is composed of mountainous terrain due to the geological structure. The groundwater movement is accompanied by the slope of the ground, so the material movement in the underground environment is free. In addition to soil layer contamination, groundwater contamination is inevitably followed. In particular, groundwater pollutants spread to surrounding areas according to groundwater behavior and form a wide range of polluted areas. If they are left unattended, the groundwater environment is deteriorated and the soil can be prevented and treated with minimal expense. And it is necessary to improve and develop a method for treating underground sources of groundwater.

Conventionally, when a pollutant is found in the soil layer, the trench is excavated to the depth where the pollutant appears along the polluted layer to install a trench to change the groundwater channel or install a concrete structure to block or block the spread of the pollutant to the surrounding area. The contaminated groundwater generated inside has been pumped to the ground, or the contaminated soil has been excavated and treated on the ground.

Or in order to treat the pollutant in groundwater that is behaving underground, a large-diameter tubular perforated pipe is installed in a contaminated site under a certain depth, and the groundwater is recovered to the ground using an underwater pump to treat the pollutant. Traditional submersible pumping devices are designed to recover pollutants dissolved in groundwater as the peaks and troughs are repeatedly operated at set depths, with the bulk of the groundwater being recovered must be treated at ground level to meet discharged water quality standards. In this case, the fluid pollutant floating in the upper part is not selectively recovered by the submersible pump operation, so it must be recovered by manpower.

In addition, existing methods such as the installation of concrete barriers in trenches and large-diameter perforated pipes are widely used to recover pollutants, but there is a defect that the flow path must be blocked or the groundwater flow direction must be changed at a designated point to recover polluted groundwater. In order to treat the ground pollutants, the groundwater must be collected to the ground at the designated point. Therefore, these methods adversely affect the groundwater ecosystem by directly or indirectly affecting the groundwater characteristics of adjacent sites.

Recently, a method of installing a small diameter perforated pipe and pumping the contaminant in the groundwater by a pump has been developed and used to recover the contaminant in the groundwater layer to the ground. However, it has the advantage of selectively recovering the fluid oil. However, it is difficult to recover the pollutant dissolved in the groundwater. Therefore, in order to remove the dissolved groundwater, a large amount of groundwater must be pumped to the ground as in the conventional method. It is suitable for the treatment of pollutants in the site, but there are disadvantages of excessive installation cost and deterioration of treatment efficiency in extensively contaminated sections.

In addition to the above method, in order to remove the pollutants of the groundwater layer, air injection methods for recovering volatile pollutants by directly injecting air into the soil layer have been used. However, these methods are preferably applied to sandy soils having good breathability or permeability, and have good soil quality and viscosity. It is limited to use in sites with relatively low permeability, such as Sato, and in the case of sites where groundwater behavior exists, the effect of removing pollutants by air injection is limited to a limited range, so the fluidity in groundwater moved to other sites with time There is a danger that the source of contamination cannot be effectively recovered.

In addition to the air injection method, the bio-contamination method for contaminating soils that promotes the decomposition of organic matter by microorganisms by injecting microorganisms and nutrients directly into the contaminated spots in the soil layer and forcibly injecting air. However, these methods are also limited depending on the composition of the soil layer, and it is generally applied to the sites with excessive groundwater.

Patents These methods require a period of one, two or several years, depending on the application, to eliminate the source of contamination, and require expensive equipment or equipment to be installed in a relatively short period of time. In addition, the installation work is complex and has a defect that requires excessive operating costs, and if the pollutant is moved along the groundwater layer, the pollution range is expanded, and thus, the treatment method must be changed over time.

The present invention prevents the spread of pollutants while allowing the groundwater to behave naturally without changing the flow direction of the groundwater, while separating and recovering the pollutants in the liquid phase and the gas phase, and inducing a biological decomposition reaction to oxidize the organic matters. The purpose of the present invention is to provide an integrated flow path induced pollution treatment device and its installation method for preventing and treating the spread of oil pollution sources according to the groundwater behavior to remove the pollutant in the field.

In order to achieve this object, the present invention consists of a trench structure and its associated device.

The structure of the present invention starts with the excavation work to form a conventional trench to install a flow path induction barrier to prevent the diffusion by inducing groundwater flow, and horizontally the diffuser that can inject a microbubble at the bottom of the excavation site It is installed, vertical vertical perforated pipes for groundwater recovery, and finally it is composed of a structure that is filled with crushed stone, gravel and sand, which is rather large.

In addition, the present invention is configured as a subsequent treatment device for recovering the pollutant in the groundwater collected inside the structure after the installation of the structure by physical phase separation and at the same time to decompose by microbiological oxidation.

1 is a cross-sectional view showing the internal configuration of the flow path guide trench structure.

2 is a cross-sectional view showing the structure of the diffuser in the flow path guided trench;

3 is a detailed view of a double hole tube in a flow path guided trench.

4 is an installation of the pollutant follow-up treatment apparatus.

*** Explanation of symbols for the main parts of the drawings *** 1: Trench 2: Barrier membrane 3: Porous sheet 4: Trench bottom 5: Diffusion pipe 6: Cast iron pipe 7: Air injection device 8: Non-porous pipe 9: Nutrient injection pipe DESCRIPTION OF SYMBOLS 10 Hole 11 Oil hole 11 "Slot 12: Pressure reducing pumping apparatus 13: Solid 14: Pressure reducing tank 15: Filter 16: Deodorizing tower 17: Lower piping line 18: Oil-water separator 19: Polluted water treatment tank 20: Oil storage tank

Hereinafter, the present invention will be described in detail.

The excavation depth of the soil layer for the installation of the trench (1) should not exceed 1m from the groundwater level measured at the lowest point in consideration of the maximum fluctuation range of the groundwater level measured in principle, based on the depth of the pollutant. . Depending on the excavation equipment used in the installation, the device is preferably applied to sites with a minimum depth of contaminant or a minimum groundwater level within 5 m to 6 m from the earth's surface. At this time, the spatial shape of the trench is suitable for the direct channel type connecting the excavation point as a channel as a whole. However, for areas where the depth of contamination and the lowest groundwater level are more than 6 m from the ground surface, it is appropriate to install discontinuous tubular trenches by auger type drilling equipment.

In addition, the excavated width is determined by evaluating workability, groundwater flow direction, and flow velocity, and at least 1m. In particular, as the installation work of additional structures in the trench space to prevent soil collapse accidents caused by the soil composition and to determine in consideration of safety.

In the trench properly excavated according to the site conditions, the barrier layer is made of a synthetic resin sheet such as polyethylene or polyvinyl having a thickness of about 0.2 to 5 mm on the sidewall corresponding to the outlet of the groundwater flow direction to induce the flow of groundwater to the lower end (2). Install). The barrier film 2 is manufactured to a length that prevents groundwater from passing through the lower end of the groundwater level of the annual average highest point and the lowest point measured in the site to prevent the maximum level fluctuation of the groundwater. In addition, the groundwater inflow portion of the trench structure may be provided with an additional function of suppressing the inflow of viscous soils that block pores of the trench by installing a porous sheet 3 such as a nonwoven fabric on the sidewalls if necessary.

In addition, the barrier film 2 plays an important role of preventing the upper portion of the groundwater level from being discharged in the direction of the groundwater flow, and prevents the flow of the pollutant when the liquid pollutant is present in the upper portion of the groundwater. Therefore, the barrier film 2 allows the clean ground water treated inside the trench 1 to flow naturally below the barrier film 2, thereby preventing the spread of the pollutant source without changing the flow path of the ground water.

The trench bottom 4 is horizontally laid with a rod-shaped or cylindrical diffuser 5 which is designed to generate microbubbles with a groundwater layer, and is installed at intervals of 1 m to 5 m and connected to the PVC pipe or cast iron pipe 6 to be installed on the ground. Protrude to be connected to the air injection device (7). The installation depth of the diffuser 5 should be installed just below the lowest point of the fluctuation of the groundwater level. At this time, the air injection amount by the air injection pump installed on the ground is configured to inject air to about 0.5 to 3.0 VVM (injection air volume per minute relative to the trench volume).

This air diffuser injects microbubbles into the groundwater layer to volatilize the volatile contaminants dissolved in the groundwater, and floats the floating contaminants into the upper part of the groundwater. The microorganism multiplies by supplying oxygen into the groundwater. It is responsible for promoting the action of decomposing and removing organic pollutants by making conditions to make them.

At the same time to install a diffuser device is installed on the bottom by combining a non-tubing pipe (8) of 5mm to 20mm to inject the nutrient solution required for the growth and activity of microorganisms.

The nutrient solution inlet pipe 9 drills a hole 10 of about 0.1 mm to 1.5 mm at the point where the diffuser 5 is installed and is injected by a ground injection pump. The volume of the metering pump is determined by the concentration of nutrient solution supplied, the concentration of pollutant in the groundwater layer, and the rate of microbial growth. The container that stores the nutrient solution and supplies it to the trench (1) is installed on the ground, and the solution is prepared by using the treated groundwater recovered from the trench.

Injection of the medicinal solution has a significant effect on the microorganism activation in the trench and is used as the most suitable decontamination method that does not cause secondary pollution by completely decomposing pollutants in groundwater along with external environment such as temperature, pH and dissolved oxygen. At this time, the fine air supplied from the diffuser (5) forms turbulence in the trench to help the mixing of the nutrient solution and imparts an important function of maintaining the phase equilibrium in the groundwater. In particular, when the temperature required for the reaction of the microorganism is not appropriate to supply the steam or hot water through the pipe so that the proper environmental control.

After installing the diffuser (5) in the bottom of the trench to install a double perforated tube or single hole 11 in the center vertically from the bottom of the trench. Perforated pipes with slots within 0.5mm to 2mm formed on the surface of PVC or cast iron pipes are installed in various sizes from 50mm to 300mm in diameter, and when installed, the slots (11 ') of the perforated pipes are over 30cm above the groundwater peak. To form. A slot is made in the upper part of the hole pipe is connected to the air pipe (8) is fixed to the structure 30 is installed on the ground.

At this time, the double perforated pipe 11 is configured to be freely separated and joined by sealing the endless pipe (8 ') within 10mm to 50mm small diameter inside the hole and the inside of the hole. Uncoated pipe is connected to the ground pumping device to recover the target material to be removed to the ground by adjusting the length according to the groundwater level. At this time, the ground pumping device used is a pressure reducing pump or an ejector pump.

Decompression pumping device 12 is used to strongly recover the volatiles as well as the fluid pollutant source and infiltrate the groundwater level to seal the top of the perforated pipe and connect the protruding part to the pumping device installed on the ground. In this case, when the ejector is used as a pumping device, the installation of a floating inlet tube in the perforated tube is suitable for recovering the fluid contamination source.

Perforate the pipes vertically and fill the trench with small solids. At this time, the solids 13 to be filled are used inexpensive crushed stone or gravel, but may be used in combination with sand, if necessary. After the solids have been filled to the ground level, they are covered with an impermeable resin and finally covered with soil on site. At this time, if the ground portion is paved with concrete, if necessary, concrete paving. In particular, when covering the surface layer, the recessed cover is installed at the point where the hole tube protrudes so as not to come out of the ground. In addition, the perforated pipes protruding to the ground is connected to the pollutant after-treatment device by pipe.

An example of the pollutant post-treatment apparatus is shown in FIG.

Referring to Figure 4 as a device for treating toxic, volatile pollutants volatile gas is filtered and deodorized by the filter 15 and the deodorizing tower 16 and then discharged to the outside to separate the oil and contaminated water under reduced pressure When the pollutant is transferred to the tank 14, the pollutant filled to the upper portion of the decompression tank is transferred to the deodorization tower 16 through the filter, discharged to the outside in a deodorized state, and the sediment is discharged through the lower piping line 17. Is transported to (18) is configured to separate into the contaminated water treatment tank 19 and the oil storage tank (20).

However, such a pollutant after-treatment device is not seen as the main configuration in the present invention and may be subjected to a post-treatment in other configurations.

Thus, in order to induce natural flow without changing the groundwater flow direction, a barrier film should be provided for the contaminated sites where the fluctuations of the groundwater level are somewhat constant.

When installing the barrier film is to be excavated with a constant width of about 1m to 3m to fill the coarse crushed stone or gravel.

At this time, the installation of the barrier membrane is configured to not cause the groundwater to stagnate or interfere with the direction of the naturally formed flow as the groundwater naturally behaves to the lower layer of the barrier membrane.

The present invention as described above is installed in the bottom of the diffuser injecting micro-bubble in the existing trench and vertically installed double perforated pipes and finally filled with solid particles with large particles to recover the volatile and fluid pollution sources in the ground at the same time and ground water It is designed to integrate underground pollutants by biologically decomposing dissolved pollutants, thus preventing the pollutants from behaving along the groundwater in the soil layer and effectively controlling the pollutants in the soil. It is possible to prevent the spread of non-volatile pollutant sources along the groundwater and to recover the pollutants selectively and effectively, and to allow the treated groundwater to flow naturally through the same channel without changing the direction of the groundwater flow. And excavate the trench to a certain depth at the boundary where contamination should be prevented, and then install horizontally the rod-shaped or circular diffuser that can inject the micro air into the bottom of the trench, and install the hollow pipe of the double or single pipe at regular intervals. Of a permeable structure (hereinafter referred to as a flow-induced porous trench) filled with various types of crushed stone or similar solids with an impermeable and solvent-resistant flat resin film perpendicular to the direction outside the interface, with irregular particle sizes therebetween. In the underground installation method and permeable structure, the fluid contaminant naturally or forcedly separated and floated to the upper part of the groundwater is selectively recovered in the liquid phase through a double-pore pipe connected to an appropriate pump and injected into the acid pipe to the groundwater introduced into the trench. Gas state by volatilizing dissolved pollutant By collecting or injecting nutrient solution, it promotes biomass growth and oxidizes, and the treated groundwater is discharged into the flow path at the bottom of the flat water barrier to recover and remove pollutants of liquid and gaseous behaviors along the groundwater. It is effective.

Claims (5)

After excavating the trench at a certain depth at the interface, horizontally install a rod-shaped or circular diffuser that can inject micro air into the bottom of the trench, and vertically install a double- or single-tube perforated tube vertically at regular intervals. The back impermeable and solvent-resistant flat resin membrane is laid vertically to cover the lowest and highest points of groundwater in the direction out of the boundary, and there are underground installations of permeable structures filled with various types of crushed stone or similar solids with irregular particle sizes. An integrated flow path induced pollution treatment device for the prevention and treatment of oil pollution sources according to the groundwater behavior. Excavate trenches at a certain depth to the site interface where soil contamination should be prevented in the ground, and install a rod-shaped or circular diffuser that can inject micro air into the bottom of the trench horizontally, Perforated structure is installed vertically with a double or single pipe perforated pipe, and the impermeable and solvent-resistant flat resin film is laid vertically out of the interface, and filled with various types of crushed stone or similar solids with irregular particle sizes therebetween. Type porous trench) and the flowable pollutant naturally or forcibly phase separated in the permeable structure, and the fluidized pollutant floating to the upper part of the groundwater is selectively in the liquid phase through the inner pipe of the double perforated pipe connected to the appropriate pump. Recovery and injecting fine air into the diffuser As the source of volatilization dissolved in the groundwater flowing into the trench is volatilized, it is collected in gaseous state or nutrient solution is promoted to promote the growth of the biomass and oxidatively decomposed and then the treated groundwater is discharged into the flow path at the bottom of the flat plate membrane. An integrated flow path induced pollution treatment method for preventing and treating the spread of oil pollutants caused by groundwater behavior, characterized by simultaneously recovering and removing pollutants in liquid and gaseous phases behaving along the groundwater. According to claim 2, In the flow-induced porous trench with improved permeability, the free flow chemicals are floated to the upper groundwater level by the microbubble injected through the diffuser with the phase separation characteristics due to the specific gravity difference. After floating to the upper part of the groundwater level, clean groundwater separated from the lower layer is discharged along the natural flow rate to the lower part of the water curtain, so that the fluid contamination source can be selectively recovered without changing the flow path of the groundwater so that the groundwater flow is not blocked. An integrated flow path induced pollution treatment method for preventing and treating the spread of oil pollutants caused by groundwater behavior. The method of claim 2, wherein the micro-bubbles are forced into the groundwater through the diffuser in the porous trench to volatilize the volatile contaminants dissolved in the groundwater, and the volatilized contaminants are recovered to the ground in a gaseous state through the perforated pipes. Integrate for prevention and treatment of oil pollutants caused by groundwater behavior, which increases the rate of dissolved oxygen from bubbles to groundwater by turbulence generated by effectively recovering dissolved pollutants and injecting microbubbles. Euro-Induced Pollution Treatment. According to claim 4, As the delivery rate of dissolved oxygen increases to catalyze the oxygen supply required for the growth of microorganisms in the trench at this time, by injecting a nutrient solution such as nitrogen, phosphorus, etc. to the native or randomly introduced microorganisms An integrated flow path induced pollution treatment method for preventing and treating the spread of oil pollutants caused by groundwater behavior, characterized in that it enables the decomposition of dissolved pollutants in the flow path induced trench structure.