KR101691424B1 - Complex Purification System of Oil-polluted Underground Water by Physical and Biological - Google Patents

Abstract

The present invention relates to a physical and biological complex purification system for oil-polluted groundwater to efficiently remove a source of oil pollution in ground water by biological purification increasing the concentration of oxygen dissolved in the groundwater while physically purifying the groundwater polluted with oil in a contaminated region using purification techniques such as air-stripping, air-sparging, soil vapor extraction (SVE), and the like. The physical and biological complex purification system for oil-polluted groundwater comprises: a tube well part including a tube well casing, a packer means, an air diffusing means, and a degassing means; an aerating purification part; and an exhaust gas treatment part. The tube well casing is perpendicularly arranged in the ground by being buried, and has upper/lower screens formed for groundwater purification. The packer means separates upper/lower regions inside the tube well casing. The air diffusion means is arranged in the upper screen region inside the tube well casing to be capable of air-sparging for aeration. The degassing means externally circulates water in the lower screen region inside the tube well casing while dispersing the water towards the upper screen region to be capable of air-stripping. The aerating purification part supplies water externally circulated by the degassing means of the tube well part to be sprayed through the degassing means in the tube well casing, and removes oil contaminants depending on the level of oxygen dissolved in water by injecting oxygen into the water. The exhaust gas treatment part is arranged to be capable of SVE by performing vapor extraction by vacuum to extract oil contaminants in a form of volatilized gas inside the tube well casing of the tube well part.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a physical and biological complex purification system for oil-

The present invention relates to a physical and biological complex purification system for oil contaminated groundwater, and more particularly, to a system and method for cleaning a groundwater contaminated with oil in a contaminated area by air-stripping, air-sparging, In this paper, we propose a new system for purifying the groundwater contaminated with oil by using a biological purification method that physically purifies the groundwater by applying purification techniques such as SVE (Soil Vapor Extraction) will be.

As industrialization and urbanization have progressed rapidly, a large amount of organic compounds have remained as contaminants in soil and groundwater. Typical groundwater pollutants include petroleum-total hydrocarbon (TPH), benzene, and toluene toluene, ethyl benzene, BTEX which refers to xylene, chlorinated aliphatic hydrocarbons (CAHs), and the like.

However, in treating groundwater and soil, unlike surface water and air, it is heavy in weight and poor in transportability. Groundwater pollution and soil pollution tend to be long-term and pan-regional, as well as a considerable period of time to treat groundwater pollution and soil pollution There is a problem that it is costly.

Methods to purify these polluted areas include physico-chemical treatment methods such as Soil Flushing, Soil Vapor Extraction and Solvent Extraction, vitrification, incineration, Thermal treatment methods such as high-temperature thermal desorption, and biological treatment methods such as biodegradation, bioventing, and land-framing.

In recent years, a bioremediation method of returning to a natural state by using microorganisms as a purification method capable of removing pollutants at a low cost with the lowest energy is attracting attention. Here, the purification of pollutants by bioregistration can be decomposed into harmless substances such as carbon dioxide, methane, water, inorganic salts and biogas by using microorganisms capable of decomposing environmental pollutants such as organic compounds remaining in the polluted area And transforming inorganic materials into safe materials and stabilizing them into simple structures.

In addition, the processes for purifying and restoring the soil and groundwater in the presence of pollutants include an Ex-situ process using the reactor after the contaminated soil and groundwater are drawn to the ground, And in-situ processes that utilize the ability of microorganisms to decompose pollutants without elevating them.

Underground groundwater restoration technology includes bioslurping (BS) for vacuum extraction of liquid contaminants floating in the groundwater, pumping groundwater pollutants using a pump and water treatment equipment installed on the ground (P & P Treat), which is a method to remove air pollutants, and Air Sparging (AS), which blows air by blowing air into a aquifer using a compressor or a compressor, (BS, Biosparging) that biodegrades pollutants by increasing the activity of biomass.

However, since pollutants are lighter in weight than water, they exist in a wide variety of pollutants, such as fluidized contaminants floating in the surface of the groundwater, and pollutants dissolved in groundwater.

As a conventional technique disclosed for solving the above problems, Korean Patent Registration No. 477765 (Mar. 10, 2005) discloses a semiconductor device comprising a first double crystal and a second double crystal spaced apart from each other by a predetermined distance, The single crystal tablet has a predetermined length and has a plurality of screens formed on a lower outer circumferential surface thereof to extract air from the non-coated table; A first aquifer for injecting air into the aquifer; and a plurality of screens formed on a lower outer circumference of the first aquifer for injecting air into the aquifer; And a first air supply pipe installed in the non-emptying zone extraction well and communicating with the first aquifer injection well to supply air from the outside to the first aquifer injection well, wherein the second double well has a predetermined length, A plurality of screens are formed in the non-infiltration zone to inject air into the non-infiltration zone; A second aquifer for injecting air into the aquifer; and a plurality of screens formed on a lower outer circumferential surface of the second aquifer for injecting air into the aquifer; And a second air supply pipe installed in the non-infiltration tank infusion tank and communicating with the second aquifer infusion tank to supply air from the outside to the second aquifer infusion tank. Therefore, There is known a restoration structure of a double structure for restoration of contaminated soil and groundwater that can maximize the effect of soil and groundwater purification by rapidly mixing and spreading by the influence of air flow and fine bubbles.

However, the above-mentioned conventional art has a problem in that the groundwater purification process is simply performed by repeating only the physical treatment because there is a limit to the removable oil pollutants in the groundwater, there was.

In addition, in relation to the restoration work due to the underground treatment of the contaminated area, when the microorganism growth substrate such as organic acid is directly injected into the well, the mixing with the substrate toward the pollutant is slow, There is a problem that the radius of the restoration processing is very narrow due to the influence. In particular, in areas where the flow rate of the groundwater is slow, the retention time of the microorganism growth substrate injected at a high concentration is prolonged, so that a large amount of microbial growth occurs around the screen and the injection site, There was a problem of falling.

Korean Registered Patent No. 10-0477765 (Mar. 10, 2005)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and it is an object of the present invention to provide an apparatus and a method for purifying exhaust gas using a purifying technique such as air-stripping, air-sparging, and soil vapor extraction (SVE) And the biological purification process that increases the dissolved oxygen concentration of the groundwater collectively. Therefore, it is possible to maximize the removal efficiency of the pollutants to the groundwater and to set various physical purification methods, thereby optimizing the purification environment The present invention is directed to a system for the combined physical and biological purification of oil contaminated groundwater.

The physical and biological complex purification system for oil contaminated groundwater proposed by the present invention comprises a tubular casing which is vertically buried in the ground and in which upper and lower screens for groundwater purification are formed, An air diffusing means capable of air-sparging for air aeration in an upper screen region in the casing, a water circulating means for circulating water in the lower screen region in the casing, A gas pipe configured to distribute water toward an area of the screen and to be air-stripped; An aeration purifier for supplying the water circulated outside from the air degassing means of the pipe so as to be injected through the air degassing means in the pipe casing and for removing oxygen contaminants due to dissolved oxygen by injecting oxygen into the water; And a flue gas treating unit for extracting volatile gaseous pollutants in the flue gas from the flue gas in the flue gas so as to extract steam by vacuum.

And a third valve connected to the flue gas treating unit, wherein the flue gas treating unit includes a first valve connected to the upper end of the flue gas casing, Air-sparging, air-blowing, and air-blowing in the pipe section by selectively opening at least two or more of the first valve, the second valve, stripping, and Soil Vapor Extraction (SVE) functions.

And the packing means of the pipe section is fixed in position in contact with the inner surface of the pipe casing, and is configured to be movable in the vertical direction in the pipe casing.

The air diffusing means includes an air compressor, an air injection pipe connected to the air compressor and introducing air into an upper screen region in the casing, and an air diffuser provided at one end of the air injection pipe to inject air Respectively.

The air degassing means includes a circulating water outlet pipe provided at one end with an underwater pump and connected to the aeration purifying section so as to discharge water in a lower screen region of the casing casing to be supplied to the aeration purifying section, And a circulation water inflow pipe through which water is supplied to the screen area so that water can be dispersed at one end thereof, wherein the circulation water outflow pipe is provided with a cleaning water purification pipe Filter.

Wherein the aeration purifier includes a purifier tank for storing and stirring the water flowing out of the air degassing means of the pipe section, an oxygen supply pipe connected to the air diffusion means of the pipe section to form air into the purifier tank, A water circulation pipe extending from the purifying tank to supply water to the air degassing means of the pipe section and having a self-circulating water in the purifying tank.

The aeration purification unit is provided with a gas outflow pipe connected to the exhaust gas treatment unit so as to be able to flow out, in the form of gaseous oil pollutants generated in the purification tank.

Wherein the flue gas treating section includes a gas-liquid separating vessel connected to the tubular casing of the tubular casing and connected to the tubular casing for separating gas-like oil contaminants recovered from the tubular casing into polluted gas and polluted water according to the specific gravity difference, An extraction blower for extracting the separated polluted gas, and a gas scrubber for receiving the polluted gas extracted through the extraction blower and injecting cleaning water into the polluted gas to clean the gas scrubber.

According to the present invention, groundwater contaminated with oil can be removed by air-stripping, air-sparging, soil vapor extraction (SVE), etc. By physically eliminating oil pollutants using purification techniques and by increasing the dissolved oxygen concentration of groundwater, the biological activity is increased and biologically removed secondarily. Therefore, the purification efficiency of the ground pollutants is greatly improved An effect that can be improved is obtained.

In addition, the physical and biological complex purification system of the oil contaminated groundwater according to the present invention can combine various physical purification methods according to the situation of the site. Therefore, it is possible to purify the groundwater in a flexible manner, The efficiency can be remarkably improved.

In addition, the physical and biological complex purification system of the oil contaminated groundwater according to the present invention biologically removes the oil pollutants by circulating the ground water in the lower part of the canal and injects it to the upper part of the canal, thereby preventing clogging of the canal screen, The effect radius can be enlarged.

In addition, the physical and biological complex purification system of the oil contaminated groundwater according to the present invention is effective in removing the acid gas generated in the purification process and protecting the environment because the oil pollutants physically volatilized in the tank are treated with the flue gas have.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an overall configuration diagram showing an embodiment according to the present invention; Fig.
FIG. 2 is a block diagram showing a gateway according to an embodiment of the present invention; FIG.
Figures 3 (a) and 3 (b) are illustrations of first and second embodiments of packer means in an embodiment according to the present invention, respectively.
4 is a configuration diagram showing an aeration purifying section in an embodiment according to the present invention.
FIG. 5 is a configuration diagram illustrating an exhaust gas processing unit according to an embodiment of the present invention; FIG.

The present invention relates to a piping device for vertically buried in a ground and having a top / bottom screen for purifying groundwater, a packer means for separating the upper / lower area of the casing from the upper / lower area, An air diffusing means for air-sparging the air in the region of the lower screen region of the upper screen, an air diffusing means for air- a gas-tightening unit configured to be capable of air-stripping; An aeration purifier for supplying the water circulated outside from the air degassing means of the pipe so as to be injected through the air degassing means in the pipe casing and for removing oxygen contaminants due to dissolved oxygen by injecting oxygen into the water; And an exhaust gas treatment unit (SVE) capable of extracting volatile gas-type oil pollutants in the casing casing of the conduit pipe by steam extraction by vacuum so as to extract oil pollutants, Biological complex purification system is characterized by technical composition.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of a system for physically and biologically complex purification of oil contaminated groundwater according to the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, an embodiment of a system for physically and biologically complex purification of oil contaminated groundwater according to the present invention includes a pipe section 100, an aeration purification section 200, and an exhaust gas treatment section 300 .

The conduit unit 100 is the most basic structure for acquiring and purifying groundwater, and is installed vertically in the ground so that the bottom of the conduit contacts the groundwater and acquires groundwater to perform a physical purification operation.

As shown in FIG. 2, the conduit unit 100 includes a conduit casing 110 extending vertically and vertically and for introducing groundwater to purify groundwater, a packer unit 110 for dividing an inner region of the conduit casing 110, An air diffusing unit 130 and an air venting unit 140 installed so as to perform a physical purification process in the casing casing 110.

The air diffusing means 130 and the air degassing means 140 are disposed on the inner side of the casing casing 110 to secure an internal space through which the purifying operation can proceed, And an upper screen 111 and a lower screen 113 are formed on the upper and lower regions of the casing casing 110, respectively.

The pipe unit 100 is connected to the upper end of the casing casing 110 so that the upper surface of the pipe casing unit 110 is closed and the air diffusion unit 130 and the air degassing unit 140 and the exhaust gas treatment unit 300 perform functions And a tubular binding means (115) for supporting and supporting the tubular binding means.

A first valve V1 to which the air diffusing means 130 is connected and a second valve V2 to which the air degassing means 140 is connected; And the third valve (V3) to which the second valve (V3) is connected.

The first valve (V1), the second valve (V2) and the third valve (V3) are preferably constructed using a solenoid valve so as to be able to open and close by transmitting an electrical signal.

The conduit unit 100 selectively opens at least two or more of the first valve V1, the second valve V2 and the third valve V3 of the conduit binding unit so that air in the conduit unit 100 Air-sparging, air-stripping, and soil vapor extraction (SVE) functions.

For example, the piping unit 100 may be connected to the first valve (not shown) so that air-sparging and soil vapor extraction (SVE) can be performed through the air diffusion unit 130 and the exhaust gas treatment unit 300. [ Air stripping and soil vapor extraction (SVE) can be performed through the air degassing means 140 and the exhaust gas treatment unit 300, Air-sparging, air-stripping, and soil vapor extraction (SVE) can be performed by operating only the second valve (V2) and the third valve (V3) The first valve (V1), the second valve (V2), and the third valve (V3) may be all opened so that they can operate in combination.

As described above, when the pipe 100 is constructed, the groundwater is purified in various ways by various combinations of physical purification methods according to the site conditions, thereby improving the efficiency of operation of the device and greatly improving the purification efficiency of the groundwater It is possible.

The packer means 120 separates the upper / lower regions of the casing 110 from each other.

As shown in FIG. 3 (a), the packer unit 120 is fixedly installed so as to divide the inner space of the casing casing 110 into upper and lower regions.

The packer means 120 is fixed to the inner surface of the casing casing 110 so as to divide the inner space of the casing casing 110 into upper and lower regions, And a position variable structure which is movably installed.

For example, as shown in FIG. 3 (b), the packer means 120 may include a silicone packing 121 capable of expanding outwardly by a force pressing the inner surface of the casing 110 And presses the silicon packing 121 against the wall surface of the casing 110 by applying pressure corresponding to the silicone packing 121 so that the casing casing 110 It is possible to vary the position of the packer means 120 that is fixed within the packer means.

The pressurizing unit 123 is constructed by applying a hydraulic cylinder which is connected to an inflow unit (not shown in the figure) provided outside the tubular casing 110 and extends vertically.

By configuring the position variable type packer unit 120 as described above, the fixed position can be flexibly changed in response to a fluid field situation, so that it is possible to ensure excellent functionality and operational efficiency of the system.

The air diffusing unit 130 is positioned in the upper screen 111 area of the casing 110 to perform air sparging for air aeration.

The air diffusing means 130 includes an air compressor 131 provided outside the casing 110 for injecting compressed air and an air compressor 131 connected to the air compressor 131, An air injection pipe 133 for introducing air into the region of the air injection pipe 111 and an air diffuser 135 installed at one end of the air injection pipe 133 to inject air to generate minute air bubbles for air diffusion do.

The air degassing means 140 is installed on the casing casing 110 and circulates water in the area of the lower screen 113 in the casing casing 110 through the air purification unit 200, Is dispersed toward the region of the upper screen 111 to be air-stripped. That is, the air degassing means 140 can perform the air degassing function together with the groundwater circulation function.

The air degassing means 140 is provided with an underwater pump P at one end and is connected to the aeration purifier 200 by circulating the water in the region of the lower screen 113 in the casing casing 110, And a circulation water inflow pipe 143 connected to the water supply pipe 141 so as to be supplied with water from the aeration purification unit 200 to the upper screen 111 area of the pipe casing 110.

The circulating water outlet pipe 141 constitutes a purifying filter 145 for purifying the water flowing out of the casing casing 110.

It is preferable that the purifying filter 145 is provided with a plurality of purifying filters 145 so that the purifying filter 145 can perform an accurate and accurate operation according to the flow rate of the purifying water.

The circulation water inflow pipe 143 is located in the upper screen 111 region of the casing casing 110 and flows out through the circulation water outlet pipe 141 and flows through the aeration purification unit 200, A spray nozzle N capable of dispersing water is provided.

As shown in FIG. 1, the aeration purifier 200 has a structure that is connected to the pipe section 100 to circulate water for purification of oil pollutants. So that water can be injected through the air venting means (140) in the casing casing (110).

The aeration purifier 200 performs a function of injecting oxygen into the water supplied to the pipe section 100 to remove oil pollutants due to dissolved oxygen.

4, the aeration purifier 200 includes a purifier tank 210 for storing and stirring the water flowing out of the air degassing means 140 of the pipe section 100, A water circulation pipe 230 extending from the purge tank 210 to supply water to the air degassing means 140 of the pipe 100, .

The oxygen supply pipe 220 is connected to the air diffusion unit 130 of the pipe unit 100 to supply air. That is, the oxygen supply pipe 220 is connected to the air injection pipe 133 of the air diffusion unit 130, and compressed air can be supplied from the air compressor 131.

The oxygen supply pipe 220 or the air injection pipe 133 is provided with an on-off valve V4 so that the path of the compressed air supplied from the air compressor 131 can be set and controlled.

The water circulation pipe 230 is provided with a spray pump 235 for supplying water to the air degassing means 140.

The water circulation pipe 230 is provided to circulate water in the purifying tank 210. That is, the water circulation pipe 230 forms a movement path toward the purifying tank 210 along with a movement path of water toward the air degassing means 140, and a circulation valve V5 So that the path of the water supplied through the spray pump 235 can be selectively applied.

The self-circulating water circulation pipe 230 can increase the stirring efficiency of the purifying tank 210 and increase the amount of dissolved oxygen in the purifying tank 210 to increase the biological activity. Do.

Since the aeration purifier 200 includes the gas discharge pipe 240 connected to the exhaust gas treatment unit 300 so as to be able to flow out the polluted gas in the form of gas generated in the purifier tank 210, The gas containing the pollutants generated in the treatment process of the exhaust gas treatment unit 210 is extracted and cleaned through the exhaust gas treatment unit 300.

The exhaust gas treatment unit 300 extracts volatile gaseous pollutants in the casing casing 110 of the conduit unit 100 and extracts the vapor by vacuum to make a soil vapor extraction (SVE) do.

As shown in FIG. 5, the exhaust gas treatment unit 300 is connected to the casing casing 110 of the casing unit 100 to recover gas-like oil contaminants in the casing casing 110, A gas separation tank 310 and an extraction blower 320 and a gas scrubber 330 for treating the oil pollutants recovered through the gas recovery pipe 340 are provided .

The gas-liquid separation tank 310 separates gas-like oil pollutants recovered through the gas recovery pipe 340 from the casing 110 into polluted gas and polluted water according to the specific gravity difference, .

The gas-liquid separation tank 310 maintains a vacuum state through the extraction blower 320. The extraction blower 320 extracts the polluted gas separated from the gas-liquid separation tank 310 and supplies the gas scrubber 330 with the gas- .

The gas scrubber 330 receives the polluted gas extracted through the extraction blower 320 and injects washing water into the polluted gas to clean the gas scrubber 330.

The gas scrubber 330 can be implemented by applying a structure such as a scrubbing and dust collector used in general pickling and water washing facilities, and thus a detailed description thereof will be omitted.

That is, according to the present invention, the groundwater contaminated with oil is stripped by air-stripping, air-sparging, soil vapor extraction (SVE And Soil Vapor Extraction), and the biological activity is increased by increasing the concentration of dissolved oxygen in the groundwater. Therefore, it is possible to purify the groundwater by complex purification It is possible to greatly improve the removal efficiency of contaminants.

Although the preferred embodiments of the system for physically and biologically complex purification of groundwater contaminated with oil according to the present invention have been described above, the present invention is not limited thereto, and various variations and modifications may be made within the scope of the claims, And this is also within the scope of the present invention.

100: conduit 110: conduit casing
111: upper screen 113: lower screen 115:
120: Packer means 130: Air diffusion means 131: Air compressor
133: air inlet tube 135: diffuser 140: air degassing means
141: circulating water outlet pipe 143: circulating water inlet pipe 145: purifying filter
200: Aeration purifier 210: Purification tank 220: Oxygen supply pipe
230: water circulation pipe 235: spray pump 240: gas discharge pipe
300: exhaust gas treatment unit 310: gas-liquid separation tank 320:
330: Gas scrubber 340: Gas recovery pipe

Claims (8)

A capillary unit disposed vertically in the ground to form an upper / lower screen for purifying the ground water; packer means for separating the upper / lower regions of the casing from each other; Air-dispersing means for air-sparging the water in the lower screen region of the tubular casing and distributing water toward the upper screen region while air-stripping the water in the lower screen region of the tubular casing; A pipe section configured as an air degassing means that is provided as far as possible;
An aeration purifier for supplying the water circulated outside from the air degassing means of the pipe so as to be injected through the air degassing means in the pipe casing and for removing oxygen contaminants due to dissolved oxygen by injecting oxygen into the water;
And a flue gas treating unit for extracting volatile gaseous pollutants in the flue gas of the flue gas from the flue gas to extract steam by vacuum,
The aeration purifier includes a purifier tank for storing and circulating the water flowing out of the air degassing means of the pipe section, an oxygen supply pipe connected to the air diffusion means of the pipe section to inject air into the purifier tank, And a water circulation pipe extended from the purifying tank to supply water to the air degassing means of the pipe section, the water circulation pipe being capable of self-circulating water in the purifying tank.
The method according to claim 1,
And a third valve connected to the flue gas treating unit, wherein the flue gas treating unit includes a first valve connected to the upper end of the flue gas casing, A vein binding means is constituted,
Wherein at least two of the first valve, the second valve and the third valve of the tubular binding means are selectively opened to perform air-sparging, air-stripping, soil vapor extraction SVE (Soil Vapor Extraction) function, which is a combination of the physical and biological complex purification system of oil contaminated groundwater.
The method according to claim 1,
Wherein the packing means of the piping system is positionally fixed in contact with the inner surface of the piping casing and is movable in the vertical direction in the piping casing.
The method according to claim 1,
The air diffusing means includes an air compressor, an air injection pipe connected to the air compressor and introducing air into an upper screen region in the casing, and an air injection pipe installed at one end of the air injection pipe, The system comprising: a water treatment system for treating the groundwater contaminated with oil;
The method according to claim 1,
The air degassing means includes a circulation water outlet pipe provided at one end with an underwater pump and connected to supply the water in the lower screen area of the casing casing to the aeration purification unit, And a circulation water inflow pipe to which water is supplied to the upper screen area and to which a spray nozzle is installed to disperse water at one end,
Wherein the circulating water outflow pipe includes a purifying filter for purifying the water flowing out of the casing.
delete The method according to claim 1,
Wherein the aeration purifier includes a gas outlet pipe connected to the exhaust gas treatment unit so that the gas pollutant in the form of gaseous produced in the purifying tank can flow out through the exhaust gas treatment unit.
The method according to claim 1,
Wherein the exhaust gas processing unit includes a gas-liquid separator connected to the tubular casing of the tubular casing to communicate with the gas-type oil contaminant collected in the tubular casing, And a gas scrubber for receiving the polluted gas extracted through the extraction blower and spraying cleaning water to the polluted gas to clean the polluted gas. The physical and biological complex purification system .

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