CN111701342A - Underground water organic pollution extraction treatment device and process - Google Patents
Underground water organic pollution extraction treatment device and process Download PDFInfo
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- CN111701342A CN111701342A CN202010559227.5A CN202010559227A CN111701342A CN 111701342 A CN111701342 A CN 111701342A CN 202010559227 A CN202010559227 A CN 202010559227A CN 111701342 A CN111701342 A CN 111701342A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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Abstract
The invention discloses a pumping treatment device and a pumping treatment process for organic pollution of underground water, and belongs to the technical field of underground water pollution remediation. The underground water organic pollution pumping treatment device comprises a multi-unit in-situ well group and a gas separation and collection unit; the multi-unit in-situ well group comprises at least 1 pumping well and a plurality of injection wells; the plurality of injection wells are distributed around the pumping well; the gas separation and collection unit comprises a climbing film desorber; the climbing film desorber comprises a water storage pipe, a desorption pipe and a water-gas separation tank; the bottom of the water-gas separation tank is communicated with the desorption pipe, and the top of the water-gas separation tank is provided with an air outlet; a plurality of rows of tubes are axially arranged in the desorption tube; the interior of the climbing film desorber is in a vacuum state; the bottom of a water storage pipe of a climbing film desorber of the gas separation and collection unit is hermetically connected with the wellhead of a pumping well of the multi-unit in-situ well group. The invention has high efficiency of pumping out and desorbing the organic pollutants in the underground water.
Description
Technical Field
The invention belongs to the technical field of groundwater pollution remediation, and particularly relates to a device and a process for pumping out and treating organic pollution of groundwater.
Background
According to the data published by the Chinese geological environment monitoring institute, the pollution of underground water in China is developing from point to surface, from shallow to deep, from cities to rural areas, and the pollution condition of the underground water is continuously aggravated. When the nation carries out groundwater investigation and assessment, special attention is paid to important pollution sources such as mine mining areas, hazardous waste disposal sites, refuse landfills, gas stations, oil exploitation and processing, nonferrous metal processing, chemical enterprises and the like, and the pollution of the industries to groundwater is found to be very common.
In the underground water pollution field, the pumping-out treatment technology is the most widely applied and most mature ectopic repair technology, can be used for treating various pollutant types in a heavily polluted underground water area and is commonly used for treating organic pollution and heavy metal pollution.
For organic pollution of underground water, the most used method is to adopt a pumping treatment technology, arrange a certain number of pumping wells in a polluted site, pump the polluted underground water up through a water pump and the water wells, then arrange a water collecting tank, a stripping tower and a wastewater activated carbon adsorption tower on the ground for treatment and then enter a buffer tank, the treated underground water is discharged into the ground surface to flow back to the ground or be used for local water supply, and the stripped organic volatile gas is evacuated after being adsorbed by activated carbon. But the method has large occupied area of equipment, high investment cost and low efficiency. The extraction treatment device and the extraction treatment process which are miniaturized, small in investment and high in treatment efficiency are to be developed.
Disclosure of Invention
Based on the objective requirements in the field, the invention provides the underground water organic pollution extraction treatment device and the process, and the device and the process have the characteristics of miniaturization of the extraction treatment device, high treatment efficiency and investment saving.
In order to solve the technical problems, the invention adopts the following technical scheme:
the pumping treatment device for organic pollution of underground water is characterized by comprising a multi-unit in-situ well group and a gas separation and collection unit;
the multi-unit in-situ well group comprises at least 1 pumping well and a plurality of injection wells;
the plurality of injection wells are distributed around the pumping well; the gas separation and collection unit comprises a climbing film desorber;
the climbing film desorber comprises a water storage pipe, a desorption pipe and a water-gas separation tank; the bottom of the water-gas separation tank is communicated with the desorption pipe, and the top of the water-gas separation tank is provided with an air outlet; a plurality of rows of tubes are axially arranged in the desorption tube; the interior of the climbing film desorber is in a vacuum state;
the bottom of a water storage pipe of a climbing film desorber of the gas separation and collection unit is hermetically connected with the wellhead of a pumping well of the multi-unit in-situ well group.
The climbing film desorber also comprises a lower tube plate, an upper tube plate, a water distribution disc and an overflow water seal tube, wherein the upper tube plate and the lower tube plate are respectively and radially fixed at the upper end and the lower end of the desorption tube, and a plurality of through holes are uniformly distributed on the plate surfaces of the upper tube plate and the lower tube plate; the bottom openings of the tubes are matched with the through holes of the lower tube plate, and the top openings of the tubes are matched with the through holes of the upper tube plate; the tubes penetrate through the through holes in the upper tube plate and the lower tube plate and are fixed;
preferably, the fixing mode is welding;
preferably, the tops of the tubes are slightly higher than the upper surface of the upper tube plate;
preferably, the top of the tube array is 50-150mm, preferably 100mm, higher than the upper surface of the upper tube plate;
preferably, the length, the diameter and the number of the tubes satisfy the following formulas:
πDsHvx≥kQ/3600
wherein Q is the amount of water extracted and has a unit of m3H; d is the inner diameter of the tube array, and the unit is m; h is the length of the tube array and the unit is m; x is the number of tubes; v is the rising speed of the water film, the unit is m/s, and s is the thickness of the water film in the tube array, and the unit is m; k is constant and has a value range of1.25-1.5；
Preferably, the bottoms of the two sides of the water-gas separation box are water outlets, and the two side walls are partially provided with transparent structures; preferably, the transparent structure is glass;
preferably, the water diversion disc is of a disc structure, the periphery of the circumferential upper surface is axially raised to form a flange, the top of the flange is in a sawtooth shape,
preferably, the water diversion disc is arranged in the water storage pipe at a position right below a lower pipe plate corresponding to the desorption pipe;
preferably, the water diversion disc is fixed by a support rod which radially extends out of the inner wall of the water storage pipe; the number of the support rods is 4, and the support rods are uniformly distributed on the inner wall;
preferably, the top opening of the overflow water seal pipe is 25-75mm, preferably 50mm, lower than the lower pipe plate, and the bottom of the overflow water seal pipe extends into the bottom of the water storage pipe of the ascending membrane desorber and extends into the position 0.2-0.8m, preferably 0.5m, below the water level in the underground pumping well;
preferably, the water-gas baffle is a flat plate or an umbrella-shaped structure and is arranged right below a top gas outlet of the water-gas separation tank of the climbing film desorber;
preferably, the water-gas baffle is fixed by 4 support rods which axially extend downwards from the peripheral inner wall of the top opening of the water-gas separation box.
A water pumping part is arranged in the water pumping well; the water outlet of the water pumping component extends into the water storage pipe of the climbing film desorber;
preferably, the water outlet of the water-gas separation tank of the climbing film desorber is communicated with the well mouth of each injection well through a water outlet pipe;
preferably, the water outlet pipe is provided with a monitoring sampling port.
In the same multi-unit in-situ well group, the straight line distance between the pumping well and the injection well and between every two of the multiple water injection wells is the well spacing;
well spacing is less than maximum influence radius of pumping well
The maximum influence radius of the pumping well meets the following formula:
in the formula: r is the maximum influence radius of the pumping well, K is the permeability coefficient, Q is the maximum pumping amount, H is the thickness of the water-containing layer, rw is the radius of the pumping well, and Sw is the water level lowering.
The underground water organic pollution pumping treatment device further comprises: a gas treatment and discharge unit;
the gas treatment and discharge unit comprises a cyclone separator, activated carbon adsorption equipment and a water ring vacuum pump;
a gas outlet at the top of a water-gas separation tank of a climbing film desorber of the gas separation and collection unit is communicated with a gas inlet of a cyclone separator of the gas treatment and discharge unit through a gas pipeline;
preferably, the water outlet of the cyclone separator is communicated with the wellhead of each injection well of the multi-unit in-situ well group through a water outlet pipe; the gas outlet of the cyclone separator is connected to the activated carbon adsorption equipment through a gas pipeline; the water ring vacuum pump is arranged at the downstream of the activated carbon adsorption equipment.
The outer wall of the water storage pipe of the climbing film desorber is provided with a mounting seat;
preferably, the well mouth of the pumping well is arranged above the underground diving surface; the injection well wellhead is disposed above the surface.
The injection wells are distributed around the pumping well as the circle center;
preferably, each multi-unit in situ well group has 3 injection wells,
preferably, the 3 injection wells of one multi-unit in situ well group a and the 3 injection wells of the adjacent 3 multi-unit in situ well groups form a regular hexagon centered on the pumping well of the multi-unit in situ well group a;
preferably, the bottom pipe edge of the water storage pipe of the climbing film desorber is connected with the upper edge of the wellhead of the pumping well through a flange;
preferably, the water outlet pipe of the water pumping part of the water pumping well is sealed by a sealing ring at the connection part of the water outlet pipe of the water pumping part of the water pumping well and the bottom of the water storage pipe of the climbing film desorber;
preferably, the water pumping component is a deep well pump.
The underground water organic pollution extraction treatment process is characterized in that the underground area to be repaired is repaired by adopting the underground water organic pollution extraction treatment device.
The underground water organic pollution pumping treatment process comprises the following steps: desorbing volatile organic pollutants in the pumped underground water by using a gas separation and collection unit, separating the volatile organic pollutants from the water, and then discharging the volatile organic pollutants, wherein the separated water returns to the underground; preferably, pumping underground water through a pumping part of a pumping well of the multi-unit in-situ well group and entering the climbing film desorber for desorption;
more preferably, the desorbed volatile organic pollutants are discharged from a gas outlet at the top of a water-gas separation box of the climbing film desorber and enter a gas treatment and discharge unit; the separated water enters an injection well of the multi-unit in-situ well group through a water outlet and a water outlet pipe at the bottom of the water-gas separation box;
more preferably, the gas enters a cyclone separator of the gas treatment and discharge unit for further separation, and the further separated water enters an injection well of the multi-unit in-situ well group through a water outlet and a water outlet pipe of the cyclone separator; and the further separated gas enters the activated carbon adsorption equipment of the gas treatment and discharge unit for adsorption.
And (4) periodically extracting a water sample through the monitoring sampling port to monitor until the water sample monitoring result reaches the underground water quality standard, namely completing the restoration.
The underground water organic pollution pumping treatment device and process comprises a plurality of unit pumping treatment processes, contaminated site well arrangement and interval determination, and volatile organic gas collection and treatment.
The pumping treatment process of each unit comprises the steps that a climbing film desorber is partially arranged in a pumping well, water flowing out of the climbing film desorber flows into a water seal pipe in an injection well, a monitoring sampling port is arranged for monitoring and sampling, and desorbed volatile organic gas enters a cyclone separator.
And water from the cyclone separator flows into a water seal pipe in an injection well, and the volatile organic gas enters a collecting main pipe.
The climbing film desorber comprises a water storage pipe, a film desorption section and an upper water-gas separation tank which are hermetically connected to form a pumping well solid pipe.
The water storage pipe comprises a water storage pipe lower part and is sealed with a deep well pump water outlet pipe through a sealing ring, and the upper part of the water storage pipe is provided with a water distribution disc and an overflow water seal pipe.
The film desorption section comprises an upper tube plate, a lower tube plate, an outer tube and a plurality of tubes welded with the upper tube plate and the lower tube plate, wherein the upper tube plate is provided with a water outlet pipe, and the tubes are higher than the upper water level of the upper tube plate.
The upper water-gas separation box comprises an upper water-gas baffle, an air outlet pipe and two glass sight glasses at opposite positions.
Contaminated site well arrangement and interval are confirmed and are adopted hexagon well arrangement including the well arrangement mode, and the hexagonal center is the pumping well, and six angles are the injection well, and the injection well all is in the pumping well most influence radius.
The volatile organic gas collection treatment comprises that the volatile organic gas pumped out of each treatment unit is absorbed by a collection header pipe and activated carbon adsorption equipment and then is evacuated by a water ring vacuum pump.
The underground water organic pollution pumping treatment device and process comprises a plurality of unit pumping treatment processes, contaminated site well arrangement and interval determination, and volatile organic gas collection and treatment.
Furthermore, the unit pumping treatment process comprises the steps that underground water in a sieve tube of a pumping well is pumped by a deep well pump and is sent into a water storage tube at the lower part of a rising film desorber at a solid tube part in the well, the underground water is pumped by a ground water ring vacuum pump in a vacuum mode and is taken down, water in the water storage tube forms a rising water film on the inner wall of a tube of the rising film desorber through a water distribution disc, desorption of volatile organic compounds dissolved in the underground water is accelerated in a decompression state, the liquid film enters an upper water-gas separation box, water flows into an injection well group (three wells or four wells), volatile organic gas enters a cyclone separator, water further separated in the cyclone separator flows into an injection well, the volatile organic gas enters active carbon adsorption equipment through a collection header pipe for adsorption, and the volatile organic gas is emptied through.
Furthermore, the climbing film desorber is formed by hermetically connecting a water storage pipe, a film desorption section and an upper water-gas separation tank to form a pumping well solid pipe.
Furthermore, a sealing ring is used for sealing between the lower tube plate of the water storage tube of the climbing film desorber and the water outlet pipe of the deep well pump, a water distribution disc is arranged at the upper part of the water storage tube, and an overflow water seal tube is arranged to flow back into the pumping well to prevent the water level from being overhigh.
Furthermore, the film desorption section consists of an upper tube plate, a lower tube plate, an outer tube and a plurality of tubes which are welded with the upper tube plate and the lower tube plate, wherein the upper tube plate is provided with a water outlet pipe, and the tubes are higher than the upper water level of the upper tube plate.
Furthermore, a water-gas baffle is arranged at the upper part in the water-gas separation box at the upper part of the film desorber, and an air outlet pipe is arranged at the upper part.
Furthermore, a water pipe injected into the injection well by the membrane desorber and the cyclone separator extends into the position below the ground water level to form a water seal.
Furthermore, the polluted site well arrangement adopts a hexagonal well arrangement mode, a water pumping well is arranged in the center of the hexagon, and water injection wells are arranged at six corners of the hexagon.
Furthermore, the contaminated site well arrangement and the interval are smaller than the maximum pumping volume influence radius of the pumping well.
Further, the volatile organic gas collection treatment comprises that the volatile organic gas pumped out of each treatment unit is absorbed by a collection header pipe and activated carbon adsorption equipment and then is evacuated by a water ring vacuum pump.
The underground water organic pollution pumping treatment device and the underground water organic pollution pumping treatment process are characterized by comprising the following steps:
in the field pollution range, pumping wells and injection wells are constructed in a hexagonal well arrangement mode, and the well spacing is smaller than the maximum influence radius of the pumping wells.
And (3) piping each hexagonal unit pumping well and each injection well group (three wells or four wells) according to a process, and connecting each hexagonal unit gas collecting pipe with a header pipe, activated carbon adsorption equipment and a water ring vacuum pump.
Starting a water ring vacuum pump, observing from a sight glass of the water-gas separation box, debugging the ascending water film form and the effluent water surface of the outlet of the tube array of the extraction treatment equipment of each unit to be below the height of the outlet of the tube array, continuously operating each unit extraction treatment device, and periodically monitoring a water sample until a restoration target is reached.
The invention relates to a device and a process for extracting and treating organic pollution of underground water. The extraction treatment process of each unit comprises the steps that a climbing film desorber is arranged in a part of an internal pipeline of a pumping well, and desorbed volatile organic gas enters activated carbon through a cyclone separator to be adsorbed and then is exhausted. The well arrangement mode and the well arrangement intervals adopt hexagonal well arrangement including the well arrangement mode, the center of a hexagon is a pumping well, six corners are injection wells, and the well arrangement intervals are smaller than the maximum influence radius of underground water of the pumping well.
Compared with the prior art, the invention has the advantages that:
the invention is characterized in that each pumping well independently desorbs volatile organic gas in underground water, and the desorbed water is injected into the ground to form underground water circulation to dilute porous media polluted by the underground water.
The invention is also characterized in that the climbing film desorber desorbs under reduced pressure, and the desorption efficiency of volatile organic compounds is high.
The invention is also characterized in that the desorbed volatile organic gas is adsorbed by active carbon and then is discharged after reaching the standard.
Drawings
FIG. 1 is a schematic flow diagram of a set of multi-unit in situ well clusters, gas separation and collection units provided in accordance with an embodiment of the present invention;
FIG. 2 is a floor plan of a set of multi-unit in situ well groups according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of a climbing film desorber provided in accordance with one embodiment of the present invention; wherein, a is the overall structure schematic diagram of the climbing film desorber, and b is the component of the climbing film desorber: a top view of the upper tube sheet and the lower tube sheet;
fig. 4 is a plan view of a multi-unit in-situ well group and a gas treatment and discharge unit of a groundwater organic pollution extraction treatment apparatus according to another embodiment of the present invention.
The reference numbers are listed below: 1-injection well, 2-injection well, 3-injection well, 4-injection well, 5-injection well, 6-injection well, 7-liter membrane desorber, 8-liquid seal pipe, 9-cyclone separator, 10-pumping well, 11-pumping part (deep well pump), 12-activated carbon adsorption equipment, 13-water ring vacuum pump, 14-monitoring sampling port, 7-1-air outlet pipe (air outlet), 7-2-water-gas separation box, 7-3-upper pipe plate, 7-4-water outlet, 7-5-shell, 7-6-tube array, 7-lower pipe plate, 7-8-water diversion disc, 7-9-water storage pipe, 7-10-flange, 9-1-deep well pump water outlet pipe, 10-pumping well, 7-11-sealing ring, 7-12-overflow water seal pipe, 7-13-mounting seat, 7-14-a vacuum meter, 7-15-a water vapor baffle; 7-16-desorption tube
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention.
The embodiment of the group provides a treatment device for pumping out organic pollution of underground water. In all the embodiments of the group, the underground water organic pollution pumping treatment device has the following common characteristics: the underground water organic pollution pumping treatment device comprises a multi-unit in-situ well group and a gas separation and collection unit; as shown in fig. 1, 2, 4, the multi-unit in situ well group comprises at least 1 pumping well 10 and a plurality of injection wells 1, 3, 4; the plurality of injection wells 1, 3, 4 are distributed around the pumping well 10; the gas separation and collection unit comprises a climbing film desorber 7; as shown in fig. 3, the climbing film desorber 7 comprises a water storage pipe 7-9, a desorption pipe 7-16 and a water-gas separation tank 7-2; the bottom of the water-gas separation tank 7-2 is communicated with a desorption pipe 7-16, and the top is provided with an air outlet 7-1; a plurality of tubes 7-6 are axially arranged in the desorption tubes 7-16; the interior of the climbing film desorber 7 is in a vacuum state; the bottom of a water storage pipe 7-9 of a climbing film desorber 7 of the gas separation and collection unit is hermetically connected with the wellhead of a pumping well 10 of the multi-unit in-situ well group.
In some embodiments, as shown in fig. 3, the climbing-film desorber 7 further comprises a lower tube plate 7-7, an upper tube plate 7-3, a water diversion disc 7-8, and an overflow water seal pipe 7-12, wherein the upper tube plate 7-3 and the lower tube plate 7-7 are respectively fixed radially at the upper end and the lower end of the desorption pipe 7-16, and a plurality of through holes are distributed on the plate surface; the bottom openings of the tubes 7-6 are matched with the through holes of the lower tube plate 7-7, and the top openings are matched with the through holes of the upper tube plate 7-3; the tubes 7-6 penetrate through holes in the upper tube plate 7-3 and the lower tube plate 7-7 and are fixed;
preferably, the fixing mode is welding;
preferably, the tops of the tubes 7-6 are slightly higher than the upper surface of the upper tube plate 7-3;
preferably, the top of the tube array 7-6 is 50-150mm, preferably 100mm, higher than the upper surface of the upper tube plate 7-3; the arrangement has the advantages that the water level in the water-gas separation box 7-2 is higher than that of the water surface, so that the water in the water-gas separation box 7-2 does not flow back into the tube nest 7-6 along the wall of the tube nest 7-6;
preferably, the length, the inner diameter and the number of the tubes satisfy the following formulas:
πDsHvx≥kQ/3600
wherein Q is the amount of water extracted and has a unit of m3H; d is the inner diameter of the tube array, and the unit is m; h is the length of the tube array and the unit is m; x is the number of tubes; v is the rising speed of the water film, the unit is m/s, and s is the thickness of the water film in the tube array, and the unit is m; k is constant and has a value range of 1.25-1.5.
In a specific embodiment of the invention, the thickness of the water film in the tube and the rising speed of the water film are as follows: s is 0.001m and v is 1.5 m/s.
Specifically, the thickness of the water film in the tube array can be measured by a water film thickness measuring instrument, and the rising speed of the water film can be measured by a hot film velocimeter.
In a more specific embodiment of the invention, the length of the tubes 7-6 is 2-4 m, the tube diameter is 10-100mm, and the number of the tubes is 3-30;
preferably, the bottoms of the two sides of the water-gas separation box 7-2 are water outlets 7-4, and the two side walls are partially provided with transparent structures; preferably, the transparent structure is glass; the advantage of this arrangement is that it facilitates the observation of the conditions inside the resolver 7;
preferably, the water distribution disc 7-8 is a disc structure, the periphery of the circumferential upper surface is axially protruded to form a flange, the top of the flange is in a sawtooth shape, and the sawtooth shape has the function of uniformly distributing water around.
Preferably, the water diversion disc 7-8 is arranged in the position, corresponding to the position right below the lower pipe plate 7-7 of the desorption pipe 7-16, in the water storage pipe 7-9;
preferably, the water diversion disc 7-8 is fixed by a support rod which radially extends out of the inner wall of the water storage pipe 7-9; the number of the support rods is 4, and the support rods are uniformly distributed on the inner wall; the water distribution discs 7-8 are used for distributing water in the tubes;
preferably, the top opening of the overflow water seal pipe 7-12 is 25-75mm, preferably 50mm, lower than the lower tube plate, and the bottom of the overflow water seal pipe extends into the bottom of the water storage pipe 7-9 of the rising film desorber 7 and extends 0.2-0.8m, preferably 0.5m, below the water level in the underground pumping well; the overflow water seal pipe 7-12 is used for deeply penetrating into the water level of the pumping well 10 to form water seal so as to ensure the vacuum state in the climbing film resolver 7;
preferably, the water-gas baffle 7-15 is a flat plate or an umbrella-shaped structure and is arranged right below a top gas outlet 7-1 of the water-gas separation tank 7-2 of the climbing film desorber 7;
preferably, the water-gas baffle 7-15 is fixed by 4 support rods which axially extend downwards from the inner wall of the periphery of the top opening of the water-gas separation box 7-2.
The water-gas baffle 7-15 is used for blocking the water film rising from the tube nest 7-6, the space between the water-gas baffle 7-15 and the inner wall of the top of the water-gas separation box 7-2 is a gas channel, water drops are condensed on the lower surface of the water-gas baffle 7-15 and fall downwards, and gas is continuously discharged from the outlet 7-1 of the top of the water-gas separation box 7-2 upwards through the gas channel.
The function of the tube array 7-6 is that under the vacuum action, the pumped water forms a water film with the thickness of about 1 millimeter on the inner wall of the tube array 7-6, and simultaneously, under the vacuum condition, volatile organic compounds dissolved in the water film are desorbed.
The water pumping part 11 in the pumping well 10 works to pump out the polluted underground water to be restored and enters the water storage pipe 7-9 of the climbing film desorber 7 to the position of a pipe plate below the desorption pipe 7-16, the redundant water enters from the top opening of the overflow water seal pipe 7-12 and flows back into the pumping well 10, the water film on the inner wall of the row pipe 7-6 is vacuumized up after being distributed by the water diversion disc 7-8, the volatile organic compounds dissolved in the water are easy to desorb due to the formation of the water film, and the necessary condition for the desorption of the gas solute is that the partial pressure of the absorbable component in the gas phase must be smaller than the equilibrium partial pressure of the absorbate in the liquid phase, so the desorption effect is quicker under the reduced pressure condition (the preferred vacuum in the invention). The part without water entering the diameter middle part of the tube array 7-6 upwards forms an air flow, the water film along the inner wall of the tube array 7-6 also upwards moves to enter the water-gas separation box 7-2, and the water and the gas in the air flow are further separated due to the different densities of the water and the gas.
In the specific embodiment, a water pumping part 11 is arranged in the water pumping well 10; the water outlet of the water pumping part 11 extends into the water storage pipe 7-9 of the climbing film desorber 7;
preferably, the water outlet 7-4 of the water-gas separation tank 7-2 of the climbing film desorber 7 is communicated with the wellhead of each injection well 1, 3, 4 through a water outlet pipe;
preferably, the wellhead piping of injection wells 1-6 is provided with a monitor sampling port 14.
In a specific embodiment, in the same multi-unit in-situ well group, the straight line distances between the pumping well 10 and the injection wells 1, 3 and 4 and between every two of the multiple water injection wells 1, 3 and 4 are well spacing distances;
the well spacing is less than the maximum influence radius of the pumping well:
the maximum influence radius R of the pumping well meets the following formula:
in the formula: k-permeability coefficient (m/d), Q-maximum pumping capacity (m)3H, water-containing layer thickness (m), rw, pumping well radius (m), and Sw, water level depth.
In a further embodiment, the underground water organic pollution pumping treatment device further comprises: a gas treatment and discharge unit;
as shown in fig. 1 and 4, the gas treatment and discharge unit includes a cyclone 9, an activated carbon adsorption device 12, and a water ring vacuum pump 13;
a top gas outlet 7-1 of a water-gas separation tank 7-2 of a climbing film desorber 7 of the gas separation and collection unit is communicated with a gas inlet of a cyclone separator 9 of the gas treatment and discharge unit through a gas pipeline;
preferably, the water outlet of the cyclone separator 9 is communicated with the wellhead of each injection well 1, 3, 4 of the multi-unit in-situ well group through a water outlet pipe; the gas outlet of the cyclone separator 9 is connected to an activated carbon adsorption device 12 through a gas pipeline; a water ring vacuum pump 13 is provided downstream of the activated carbon adsorption apparatus 12.
In other embodiments, the outer wall of the water storage pipe 7-9 of the climbing film desorber 7 is provided with a mounting seat 7-13;
preferably, the wellhead of the pumping well 10 is disposed above the subsurface; injection wells 1, 3, 4 are placed above the surface.
In a specific embodiment, a plurality of injection wells 1, 3, 4 are distributed around the pumping well 10 as a circle center;
preferably, each multi-unit in situ well group has 3 injection wells 1, 3, 4,
preferably, the 3 injection wells 1, 3, 4 of one multi-unit in situ well group a and the 3 injection wells 2, 5, 6 of the adjacent 3 multi-unit in situ well groups form a regular hexagon centered on the pumping well 10 of the multi-unit in situ well group a;
preferably, the bottom pipe edge of the water storage pipe 7-9 of the climbing film desorber 7 is connected with the upper edge of the wellhead of the pumping well 10 through a flange 7-10;
preferably, a water outlet pipe of the water pumping part 11 of the water pumping well 10 is sealed by a sealing ring at the connection position with the bottom of the water storage pipe 7-9 of the climbing film desorber 7;
preferably, the pumping part 11 is a deep well pump.
The group of embodiments provide a process for extracting and treating organic pollution of underground water. In all the examples in this group, the groundwater organic pollution extraction treatment process has the following common characteristics: the underground area to be repaired is repaired by adopting the underground water organic pollution extraction and treatment device provided by any one of the embodiment 1.
In a further embodiment, the underground water organic pollution extraction treatment process comprises the following steps: desorbing volatile organic pollutants in the pumped underground water by using a gas separation and collection unit, separating the volatile organic pollutants from the water, and then discharging the volatile organic pollutants, wherein the separated water returns to the underground; preferably, pumping underground water through a pumping part of a pumping well of the multi-unit in-situ well group and entering the climbing film desorber for desorption;
more preferably, the desorbed volatile organic pollutants are discharged from a gas outlet at the top of a water-gas separation box of the climbing film desorber and enter a gas treatment and discharge unit; the separated water enters an injection well of the multi-unit in-situ well group through a water outlet and a water outlet pipe at the bottom of the water-gas separation box;
more preferably, the gas enters a cyclone separator of the gas treatment and discharge unit for further separation, and the further separated water enters an injection well of the multi-unit in-situ well group through a water outlet and a water outlet pipe of the cyclone separator; and the further separated gas enters the activated carbon adsorption equipment of the gas treatment and discharge unit for adsorption.
In other embodiments, water samples are periodically extracted through the monitoring sampling port for monitoring until the water sample monitoring result reaches the underground water quality standard, namely the repair is completed.
Experimental example 1
The present invention will be described in further detail with reference to examples.
Taking the pumping treatment and restoration of the organic matter polluted underground water in a certain place as an example, according to the early stage pumping test, the maximum pumping amount of a single well is 700m3And d, calculating the maximum influence radius to be 245 m, comprehensively considering treatment effect, construction period and cost factors, and setting the well spacing to be 50 m.
According to a hexagonal well arrangement mode, the well spacing is 50 meters, an injection well and a pumping well are constructed in the range of a polluted site, and the pumping quantity is 250m3Design of/d, design of rising film desorber area of 4m2The pipe is arranged according to the process requirement and connected with the activated carbon adsorption equipment and the water ring vacuum pump.
And starting a water ring vacuum pump, starting a deep well pump 9 in each unit pumping well 10 in the polluted site when the vacuum degree of the system reaches-0.08 MPa, injecting effluent of a climbing film desorber into the wells 1, 3 and 4, and injecting effluent of adjacent pumping wells after desorption into the wells 2, 4 and 6.
And the volatile organic gas from the cyclone separators of the process units enters the activated carbon adsorption equipment through the header pipe for adsorption and is discharged into the atmosphere through the water ring vacuum pump until all the repair is finished, so that the repair target is achieved.
Claims (10)
1. The pumping treatment device for organic pollution of underground water is characterized by comprising a multi-unit in-situ well group and a gas separation and collection unit;
the multi-unit in-situ well group comprises at least 1 pumping well and a plurality of injection wells;
the plurality of injection wells are distributed around the pumping well; the gas separation and collection unit comprises a climbing film desorber;
the climbing film desorber comprises a water storage pipe, a desorption pipe and a water-gas separation tank; the bottom of the water-gas separation tank is communicated with the desorption pipe, and the top of the water-gas separation tank is provided with an air outlet; a plurality of rows of tubes are axially arranged in the desorption tube; the interior of the climbing film desorber is in a vacuum state;
the bottom of a water storage pipe of a climbing film desorber of the gas separation and collection unit is hermetically connected with the wellhead of a pumping well of the multi-unit in-situ well group.
2. The underground water organic pollution pumping treatment device according to claim 1,
the climbing film desorber also comprises a lower tube plate, an upper tube plate, a water distribution disc and an overflow water seal tube, wherein the upper tube plate and the lower tube plate are respectively and radially fixed at the upper end and the lower end of the desorption tube, and a plurality of through holes are uniformly distributed on the plate surfaces of the upper tube plate and the lower tube plate; the bottom openings of the tubes are matched with the through holes of the lower tube plate, and the top openings of the tubes are matched with the through holes of the upper tube plate; the tubes penetrate through the through holes in the upper tube plate and the lower tube plate and are fixed;
preferably, the fixing mode is welding;
preferably, the tops of the tubes are slightly higher than the upper surface of the upper tube plate;
preferably, the top of the tube array is 50-150mm, preferably 100mm, higher than the upper surface of the upper tube plate;
preferably, the length, the diameter and the number of the tubes satisfy the following formulas:
πDsHvx≥kQ/3600
wherein Q is the amount of water extracted and has a unit of m3H; d is the inner diameter of the tube array, and the unit is m; h is the length of the tube array and the unit is m; x is the number of tubes; v is the rising speed of the water film, the unit is m/s, and s is the thickness of the water film in the tube array, and the unit is m; k is a constant and has a value range of 1.25-1.5;
preferably, the bottoms of the two sides of the water-gas separation box are water outlets, and the two side walls are partially provided with transparent structures; preferably, the transparent structure is glass;
preferably, the water diversion disc is of a disc structure, the periphery of the circumferential upper surface is axially raised to form a flange, the top of the flange is in a sawtooth shape,
preferably, the water diversion disc is arranged in the water storage pipe at a position right below a lower pipe plate corresponding to the desorption pipe;
preferably, the water diversion disc is fixed by a support rod which radially extends out of the inner wall of the water storage pipe; the number of the support rods is 4, and the support rods are uniformly distributed on the inner wall;
preferably, the top opening of the overflow water seal pipe is 25-75mm, preferably 50mm, lower than the lower pipe plate, and the bottom of the overflow water seal pipe extends into the bottom of the water storage pipe of the ascending membrane desorber and extends into the position 0.2-0.8m, preferably 0.5m, below the water level in the underground pumping well;
preferably, the water-gas baffle is a flat plate or an umbrella-shaped structure and is arranged right below a top gas outlet of the water-gas separation tank of the climbing film desorber;
preferably, the water-gas baffle is fixed by 4 support rods which axially extend downwards from the peripheral inner wall of the top opening of the water-gas separation box.
3. The underground water organic pollution pumping treatment device as claimed in claim 2, wherein a pumping part is arranged in the pumping well; the water outlet of the water pumping component extends into the water storage pipe of the climbing film desorber;
preferably, the water outlet of the water-gas separation tank of the climbing film desorber is communicated with the well mouth of each injection well through a water outlet pipe;
preferably, the water outlet pipe is provided with a monitoring sampling port.
4. The underground water organic pollution pumping treatment device according to claim 2 or 3, wherein in the same multi-unit in-situ well group, the straight line distance between the pumping well and the injection well and between every two of the plurality of water injection wells is the well spacing;
well spacing is less than maximum influence radius of pumping well
The maximum influence radius of the pumping well meets the following formula:
in the formula: r is the maximum influence radius of the pumping well, K is the permeability coefficient, Q is the maximum pumping amount, H is the thickness of the water-containing layer, rw is the radius of the pumping well, and Sw is the water level lowering.
5. The apparatus for pumping organic pollutants from underground water according to any one of claims 1 to 4, further comprising: a gas treatment and discharge unit;
the gas treatment and discharge unit comprises a cyclone separator, activated carbon adsorption equipment and a water ring vacuum pump;
a gas outlet at the top of a water-gas separation tank of a climbing film desorber of the gas separation and collection unit is communicated with a gas inlet of a cyclone separator of the gas treatment and discharge unit through a gas pipeline;
preferably, the water outlet of the cyclone separator is communicated with the wellhead of each injection well of the multi-unit in-situ well group through a water outlet pipe; the gas outlet of the cyclone separator is connected to the activated carbon adsorption equipment through a gas pipeline; the water ring vacuum pump is arranged at the downstream of the activated carbon adsorption equipment.
6. The underground water organic pollution pumping treatment device according to any one of claims 1 to 5, wherein a mounting seat is arranged on the outer wall of a water storage pipe of the climbing film desorber;
preferably, the well mouth of the pumping well is arranged above the underground diving surface; the injection well wellhead is disposed above the surface.
7. The underground water organic pollution extraction treatment device as claimed in claim 2, wherein a plurality of injection wells are distributed around the pumping well as the center of the circle;
preferably, each multi-unit in situ well group has 3 injection wells,
preferably, the 3 injection wells of one multi-unit in situ well group a and the 3 injection wells of the adjacent 3 multi-unit in situ well groups form a regular hexagon centered on the pumping well of the multi-unit in situ well group a;
preferably, the bottom pipe edge of the water storage pipe of the climbing film desorber is connected with the upper edge of the wellhead of the pumping well through a flange;
preferably, the water outlet pipe of the water pumping part of the water pumping well is sealed by a sealing ring at the connection part of the water outlet pipe of the water pumping part of the water pumping well and the bottom of the water storage pipe of the climbing film desorber;
preferably, the water pumping component is a deep well pump.
8. An underground water organic pollution extraction treatment process, which is characterized in that the underground area to be repaired is repaired by adopting the underground water organic pollution extraction treatment device as claimed in any one of claims 1 to 7.
9. The underground water organic pollution extraction treatment process as claimed in claim 8, which comprises the following steps: desorbing volatile organic pollutants in the pumped underground water by using a gas separation and collection unit, separating the volatile organic pollutants from the water, and then discharging the volatile organic pollutants, wherein the separated water returns to the underground; preferably, pumping underground water through a pumping part of a pumping well of the multi-unit in-situ well group and entering the climbing film desorber for desorption;
more preferably, the desorbed volatile organic pollutants are discharged from a gas outlet at the top of a water-gas separation box of the climbing film desorber and enter a gas treatment and discharge unit; the separated water enters an injection well of the multi-unit in-situ well group through a water outlet and a water outlet pipe at the bottom of the water-gas separation box;
more preferably, the gas enters a cyclone separator of the gas treatment and discharge unit for further separation, and the further separated water enters an injection well of the multi-unit in-situ well group through a water outlet and a water outlet pipe of the cyclone separator; and the further separated gas enters the activated carbon adsorption equipment of the gas treatment and discharge unit for adsorption.
10. The underground water organic pollution pumping treatment process according to claim 8 or 9, wherein a water sample is periodically pumped through the monitoring sampling port for monitoring until a water sample monitoring result reaches the underground water quality standard, and then remediation is completed.
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