CN220056422U - Circulation well system for removing volatile organic pollutants in soil and underground water - Google Patents
Circulation well system for removing volatile organic pollutants in soil and underground water Download PDFInfo
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- CN220056422U CN220056422U CN202321353852.XU CN202321353852U CN220056422U CN 220056422 U CN220056422 U CN 220056422U CN 202321353852 U CN202321353852 U CN 202321353852U CN 220056422 U CN220056422 U CN 220056422U
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Abstract
The utility model discloses a circulating well system for removing volatile organic pollutants in soil and groundwater, which comprises the following components: a circulation well and a plurality of in situ resistance heating wells; the circulating well is provided with a screen pipe at a position corresponding to the underground water aquifer, and a baffle for separating the upper aquifer from the lower aquifer is arranged in the circulating well; a water suction pump is arranged in the upper aquifer sieve tube, a water injection pump is arranged in the lower aquifer sieve tube, the water suction pump is connected with an inlet of a steam-water separator, the steam-water separator is connected with a waste gas treatment system and a waste water treatment system, and the waste water treatment system is connected with the water injection pump; a plurality of in situ resistance heating wells are disposed around the circulation well for heating the contaminated soil and groundwater. According to the utility model, the volatilization and escape of volatile organic pollutants in soil and underground water are promoted by resistance heating enhancement, the polluted underground water is pumped out by a circulating well system, the pollutants are removed, and then clean water is injected to form circulating treatment, so that the volatile organic pollutants in the soil and the underground water are effectively repaired.
Description
Technical Field
The utility model relates to the technical field of soil and groundwater organic pollution remediation, in particular to a circulating well system for removing volatile organic pollutants in soil and groundwater.
Background
The underground water circulating well technology is an in-situ repair technology, which accelerates the vertical circulation of underground water by pumping out and injecting the underground water at different depths of an aquifer, overcomes the non-uniformity of stratum in the vertical direction, collects pollutants in a circulating well body in a larger influence radius, removes the pollutants by pumping out to a ground water treatment system or a well body internal treatment system, and gradually reduces the concentration of the pollutants until the repair reaches the standard by continuous circulation. The circulating well technology is a repair technology which is very advantageous in fields with medium to high permeability, the influence radius of the circulating well technology in a sand layer can exceed 45m, the circulating well technology has obvious treatment advantages for organic pollution fields with large pollution range and deep vertical pollution depth, and the circulating well technology has wide application in foreign countries and has related engineering implementation cases in China at present.
The existing underground water circulating well mainly relies on the transverse trapping force of the circulating well and the vertical scouring force to remove pollutants in soil and underground, and has an unsatisfactory effect of removing pollutants with stronger adsorption and solubility cross in the soil. Based on this drawback, the enhanced circulation well system of the present utility model is presented. By utilizing the characteristic that the underground water is conductive, on the basis of the traditional circulating well technology, the soil and the underground water are heated in a larger range by the coupling in-situ resistance heating technology, so that on one hand, the dissolution of pollutants in the soil into the underground water is promoted, the pollutant removal capability is enhanced, on the other hand, the faster conversion of extracted pollutants into two forms of gas phase and liquid phase is promoted, and the efficiency of the circulating well for capturing the pollutants is cooperatively enhanced. Through the enhanced circulation well system, the application range of the circulation well can be widened, and the enhanced circulation well system is applicable to stratum with lower permeability, pollutants with stronger adsorption and pollutant solubility intersection in soil.
Disclosure of Invention
Aiming at the defects existing in the prior art, the utility model provides a circulating well system for removing volatile organic pollutants in soil and underground water, belonging to an enhanced circulating well system.
The utility model discloses a circulating well system for removing volatile organic pollutants in soil and groundwater, which comprises the following components: a circulation well and a plurality of in situ resistance heating wells;
the circulating well comprises sieve tubes corresponding to different depth positions of the underground water aquifer and solid tubes connecting two adjacent sieve tube sections, and a baffle for separating the upper aquifer and the lower aquifer is arranged in the circulating well; a water suction pump is arranged in the upper water-bearing layer sieve tube, a water injection pump is arranged in the lower water-bearing layer sieve tube, a water outlet of the water suction pump is connected with an inlet of a steam-water separator through a groundwater extraction pipe, a gas outlet of the steam-water separator is connected with a waste gas treatment system, a water outlet of the steam-water separator is connected with a water inlet of a waste water treatment system, and a water outlet of the waste water treatment system is connected with a water inlet of the water injection pump;
a plurality of in-situ resistance heating wells are disposed around the circulation well for heating contaminated soil and groundwater.
As a further improvement of the utility model, the in-situ resistance heating well uses underground water as a conductor, and heats soil and underground water in a pollution restoration area through electric current, the temperature of the pollution area is heated and raised to change the occurrence form of pollutants in the underground, the concentration of the pollutants in gas phase or liquid phase is increased, the dissolution and escape of volatile organic pollutants are promoted, and the collection and removal of the pollutants by the circulating well are enhanced.
As a further improvement of the utility model, a heating electrode and a conductive material are arranged in the in-situ resistance heating well, and the heating electrode is connected with a power supply adjusting system capable of adjusting power supply current; the in-situ resistance heating wells are distributed around the circulating well according to the point hexagonal full-coverage principle; furthermore, the distribution of the in-situ resistance heating wells is determined according to the influence radius, and the heating influence radius can be determined by means of field pilot tests and the like before large-scale implementation, so that the repair treatment period, the construction cost and the safety requirement are fully considered, and proper in-situ resistance heating well setting positions and power supply investment are selected.
As a further improvement of the present utility model, there is also included: a temperature measurement system;
the temperature measuring system comprises a plurality of vertical underground temperature measuring pipes and underground water thermometers which are arranged on the underground temperature measuring pipes at intervals;
the underground water temperature measuring instrument is connected with the power supply adjusting system, and the power supply adjusting system adjusts the current of the heating electrode based on the temperature monitored by the underground water temperature measuring instrument, so that the heating temperature of the in-situ resistance heating well is controlled to be 50-100 ℃, and organic pollutants in soil and underground water are heated and removed in stages; in the heating and heating process, the circulating well in the early heating stage removes pollutants dissolved in the underground water by pumping out the underground water, and volatile organic pollutants adsorbed in underground soil and pollutants with higher boiling points dissolved in the underground water tend to be more efficiently dissolved in the pumped out underground water along with the continuous rising of the underground temperature, so that the pollution restoration range is enlarged, and the efficiency of removing the pollutants is improved.
As a further improvement of the utility model, the layout principle of all the underground water thermometers is as follows: all heating areas are covered, and the planar arrangement is positioned at the cold point position where the heating electrodes are distributed and is uniformly distributed in each stratum; if there is only one formation in the entire aquifer, it is evenly distributed throughout the aquifer.
As a further improvement of the utility model, the pumped underground water and volatile gas are separated by the steam-water separator and respectively enter the wastewater treatment system and the waste gas treatment system, the pumped underground water is treated and then treated water is re-injected into the circulating well, and if the temperature after treatment has larger floating change, the wastewater treatment system is provided with a heating system, so that the temperature of the injected water is not lower than the temperature of the pumped water. Still further, temperature measurement system still includes the extraction groundwater thermoscope of laying on groundwater extraction pipe and lays the injection water thermoscope on groundwater injection pipe, be equipped with heating element in the wastewater treatment system, extraction groundwater thermoscope and injection water thermoscope link to each other with the input of heating control unit, heating control unit's output links to each other with heating element, detects when heating control unit that the temperature of injection water is less than the temperature of extraction water, then control heating element work to guarantee that the injection water temperature is not less than the extraction water temperature.
As a further improvement of the present utility model, there is also included: a fixed rod;
and the water level meter is installed at the position of the fixed rod corresponding to different depths of the groundwater aquifer, and is linked with the water suction pump and the water injection pump.
As a further improvement of the utility model, the barrier is an inflatable barrier which is used for separating the space in the well between the upper layer of screen pipe and the lower layer of screen pipe and respectively extracting and injecting, the extracted groundwater enters a steam-water separation device to separate gas phase pollutants from pollutants dissolved in water, and then wastewater treatment and waste gas treatment are respectively carried out; the blocking device is connected with the ground control device, and the upper and lower positions of the blocking device in the circulating well are adjusted based on the ground control device, so that the space volume of the main body of the circulating well for injecting clean water and extracting polluted water is different. According to the extraction amount and injection amount of the polluted underground water or the extraction/injection difficulty, the water pressure in the circulating well body can be indirectly adjusted by adjusting the position of the blocking device, so that the influence range of extraction and injection is influenced.
As a further improvement of the utility model, the wastewater treatment system is an oxidation water treatment system or a reduction water treatment system, the pumped polluted groundwater is reinjected into an underground circulation well after being treated by water, and the wastewater treatment system participates in the circulation of the next stage, so as to improve the pollutant removal efficiency, and a heating component is arranged on the wastewater treatment system to ensure that the temperature of the injected water is not lower than the temperature of the pumped groundwater.
As a further improvement of the utility model, the exhaust gas treatment system is an activated carbon adsorption system or a catalytic combustion system, and can also directly burn so as to finally reach the emission standard.
As a further improvement of the utility model, the maximum flow rate of extraction and injection of the circulating well system is not more than 30m 3 And/h, the treatment capacity of the wastewater treatment system is not less than 35m 3 And/h, the exhaust gas treatment system is operatedCapacity of not less than 30m 3 /h, two stages of 15m can be used 3 The/h equipment is used in parallel, and the heating temperature is increased by 15m at the initial stage of heating and the expiration of the treatment operation 3 The/h processing capacity can only start any stage of system.
As a further improvement of the utility model, the main structure of the circulating well is made of 304L or 316L stainless steel, and the gap of the screen seam of the screen pipe part of the well body is 1-2mm; the materials of the pipeline components such as the water suction pipe, the water injection pipe, the elbow and the like are stainless steel.
As a further improvement of the utility model, the diameter of the main body of the circulating well is 30-40cm, and the connection mode of the upper well body and the lower well body can be in a spiral mode or a buckling mode.
As a further improvement of the utility model, the water suction pump and the water injection pump in the circulating well are made of stainless steel.
As a further improvement of the utility model, the heating system comprises a transformer, an electric power control unit, an electrode well and a control cabinet, wherein the control cabinet is connected with the electrode well, and the electrodes are made of galvanized steel.
Compared with the prior art, the utility model has the beneficial effects that:
aiming at the property of volatile organic pollutants, the utility model utilizes the characteristic of conductivity of underground water, and based on the traditional circulating well technology, the soil and the underground water are heated in a larger range by the coupled in-situ resistance heating technology, so that on one hand, the dissolution of the pollutants in the soil into the underground water is promoted, on the other hand, the conversion of the extracted pollutants into two forms of gas phase and liquid phase is promoted, and the efficiency of the circulating well for capturing the pollutants is synergistically enhanced;
according to the utility model, the steam-water separator is arranged outside the circulating well body, and the extracted polluted underground water is subjected to steam-water separation, so that gas phase and liquid phase respectively enter the waste gas treatment system and the waste water treatment system, the treatment efficiency of pollutants is pertinently enhanced, and the reinjection capacity of the circulating well after the polluted underground water is treated is improved;
the utility model adopts large-scale heating and temperature rising to control the phase state change of volatile organic pollutants in underground soil and underground water at different temperature sections, sequentially enhances the volatilization of pollutants with different boiling points, and is matched with an overground disposal facility to remove the pollutants.
Drawings
FIG. 1 is a plan view of the arrangement of the circulation well system for removing volatile organic contaminants from soil and groundwater of the present disclosure;
FIG. 2 is a cross-sectional view of the disclosed circulation well system for removing volatile organic contaminants from soil and groundwater.
In the figure:
1. a circulation well; 2. in-situ resistance heating wells; 3. a steam-water separator; 4. a wastewater treatment system; 5. an exhaust gas treatment system; 6. a groundwater extraction pipe; 7. an underground water injection pipe; 8. injecting water thermometer; 9. pumping out the underground water thermometer; 10. a barrier; 11. a power supply regulation system; 12. a temperature measurement system; 13. an underground temperature measuring tube; 14. a water injection pump; 15. a water pump; 16. an upper aquifer screen; 17. a solid pipe; 18. a lower aquifer screen; 19. a fixed rod; 20. an upper water level gauge; 21. a lower water level gauge; 22. an underground thermometer.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The utility model provides an enhanced circulating well system for removing volatile organic pollutants in soil and underground water, which comprises an in-situ resistance heating well system for electrically heating polluted soil and underground water, a temperature measuring system for measuring the temperature of extraction, injection and injection under the ground and on the ground, a circulating well system for extracting and injecting the underground water to generate a vertical underground water flow field, and a waste water treatment system and a waste gas treatment system matched with the circulating well system; the in-situ resistance heating wells are distributed around the circulating well, underground water is used as a conductor, soil and underground water in the pollution repair area are heated through current, the dissolution and escape of volatile organic pollutants are promoted, and the collection and removal of the pollutants by the circulating well are enhanced; the working temperature of the in-situ resistance heating well is regulated by the feedback of an underground temperature measuring point to a power supply regulating system, and the heating temperature is controlled to be 50-100 ℃ in stages through temperature measurement, so that pollutants with different boiling points in soil and underground water are heated and removed in stages. The heated underground water is pumped out to the ground through a circulating well, a steam-water separator is arranged in front of a wastewater treatment system, the pumped underground water and volatile gas are separated through the steam-water separator and respectively enter the wastewater treatment system and an exhaust gas treatment system, and the pumped underground water is treated by the wastewater treatment system and then treated water is reinjected into the circulating well; if the temperature after treatment has larger floating change, the wastewater treatment system is provided with a heating component, so that the temperature of the injected water is ensured not to be lower than the temperature of the extracted water. According to the utility model, the volatilization and escape of volatile organic pollutants in soil and underground water are promoted by resistance heating enhancement, the polluted underground water is pumped out by a circulating well system, the pollutants are removed, and then clean water is injected to form circulating treatment, so that the volatile organic pollutants in the soil and the underground water are effectively repaired.
1000m in groundwater and soil with exposure to volatile organic contaminants benzene (boiling point 80.1 ℃), toluene (boiling point 110.6 ℃) and 1, 2-dichloroethane (boiling point 83.5 ℃) 2 The pollution site is taken as an example, and the treatment operation of the enhanced circulation well system is described:
as shown in fig. 1 and 2, the present utility model provides an enhanced circulation well system for removing volatile organic contaminants from soil and groundwater, comprising: the system comprises an in-situ resistance heating well system for electrically heating polluted soil and underground water, a temperature measuring system for extracting, injecting and measuring temperature below the ground and above the ground, a circulating well system for extracting and injecting the underground water to generate a vertical underground water flow field, and a waste water treatment system and a waste gas treatment system matched with the circulating well system; wherein,
the in-situ resistance heating well system comprises a power supply adjusting system 11, an overground power supply circuit, an in-situ resistance heating well 2 and an electrode unit, wherein the in-situ resistance heating well is arranged around a circulating well 1 and is matched with the circulating well 1 for repairing operation; the power supply regulating system consists of a transformer, a power control system, a cable and the like, and a heating electrode and a conductive material are arranged in the in-situ resistance heating well; and determining the influence radius of the in-situ heating well and the influence radius of the circulating well by a field pilot scale according to the condition of the project repairing site, wherein the influence radius a of the in-situ heating well is determined to be 5m, and the influence radius b of the circulating well is determined to be 20m, and the arrangement of the in-situ heating well and the circulating well in the field is shown in figure 1 according to the principle of full-coverage of the point hexagons. Meanwhile, according to the planar layout of the in-situ electric heating system, the control of the electrode wells can be controlled independently one by one or controlled uniformly by similar units, the temperature rising condition of the underground heating fed back by the temperature measuring system is adjusted by adjusting the supply of voltage and current to the temperature rising power of the electrode wells, and therefore the ambient temperature of the single heating well or the underground temperature of the block are adjusted.
The temperature measuring system 12 comprises a plurality of vertical underground temperature measuring pipes 13, underground water thermometers 22 which are arranged on the underground temperature measuring pipes at intervals, an extracted underground water thermometers 9 which are arranged on the underground water extraction pipes 6 and an injected water thermometers 8 which are arranged on the underground water injection pipes 7, wherein the underground temperature measuring pipes 13 can be arranged in a temperature well; the temperature well for monitoring the heating temperature in the underground soil/underground water is a small-caliber stainless steel well, the well body is of a closed structure and is used for protecting the underground water thermometer 22 and placing the underground water thermometer 22 in a proper depth range, and the underground water thermometer 22 is a thermocouple temperature sensing element arranged on the wall of the temperature well and transmits temperature data to an overground receiver for recording through a signal wire. The water temperature in the water pumping pipeline and the water injection pipeline in the monitoring circulation well are pumped out underground water temperature measuring instrument 9 and the injected water temperature measuring instrument 8 which are temperature measuring instruments arranged on the outer wall of the pipeline, are radially arranged on the side wall of the pipeline by using flanges or screws, and are used for measuring the fluid temperature in the pipeline through the expansion degree of metal sheets built in the overflow space in the pipeline at different temperatures. The temperature measurement system 12 links feedback data of the underground thermometer 22 to an in-situ heating system, adjusts power input through coupling analysis feedback of temperature data and pollutant extracting processing capacity, carries out constant temperature processing on pollutants with larger volatilization amount in a certain temperature section until the processing efficiency is steadily reduced, then raises the temperature again, heats the pollutants with higher boiling point to promote dissolution and volatilization, then extracts and removes the pollutants, and controls the heating temperature of the in-situ resistance heating well to be 50-100 ℃ through temperature control and repair operation cooperative processing. The waste water treatment system 4 is internally provided with a heating component, the extracted groundwater thermometer 9 and the injected water thermometer 8 are connected with the input end of the heating control unit, the output end of the heating control unit is connected with the heating component, and when the heating control unit detects that the temperature of the injected water is lower than the temperature of the extracted water, the heating component is controlled to work so as to ensure that the temperature of the injected water is not lower than the temperature of the extracted water.
The circulating well 1 of the utility model comprises a screen pipe corresponding to different depth positions of a groundwater aquifer and a solid pipe connecting two adjacent screen pipe sections, such as an upper aquifer screen pipe 16, a solid pipe 17 and a lower aquifer screen pipe 18 shown in figure 2; the underground water treatment system is generally made of stainless steel, a pipe well is built through a long spiral drilling machine according to project requirements, the pipe well comprises an underground water injection pipe 7 and a water injection pump 14 for injecting water into an aquifer, an underground water extraction pipe 6 and a water suction pump 15 for extracting water from the aquifer, a barrier 10 and an adjusting device thereof for separating underground water from volatile gas in the pipe well of different aquifers, a steam-water separation device 3 for separating underground water from volatile gas, polluted water enters a wastewater treatment system 4 after steam-water separation, waste gas enters an overground waste gas treatment system 5 according to the property of volatile organic pollutants, the main treatment process of the overground wastewater treatment system 4 is oxidation generally, and the main treatment process of the waste gas treatment system 5 adopts a field flexible treatment mode such as activated carbon adsorption. An upper water level meter 20 and a lower water level meter 21 are arranged in the pipe well, two or even a plurality of water level meters are placed in different water-containing layers through a stainless steel fixing rod 19, and the height of the water-containing layers in the pipe well is monitored through the water level meters so as to adjust pumping and water injection operation. The function of the circulating well barrier 10 is to separate the upper and lower aquifers in the well, the barrier separates the vertical space in the well by inflation, but the lower pumping pipeline and pump body lines, monitors and the like can still function by passing through the barrier body. Barrier 10 may be used as desiredA plurality of circulating wells are arranged in the circulating well body, and the circulating wells move up and down in the well body according to the depth distribution of the target aquifer. As described above, the pipes for extracting the polluted water and injecting the clean water are provided with thermometers for measuring the water temperatures of the two parts, reflecting the underground heating condition and ensuring that the injected clean water does not lower the overall underground temperature. If the clean water temperature is obviously reduced after the wastewater treatment process, a heating rod is arranged in the clean water tank to heat the water to at least the water outlet temperature. The extraction and injection rate of each pipe well of the circulating well system is 15m 3 And/h, the treatment capacity of the ground water treatment system is 20m 3 And (h) enabling the waste gas entering the waste gas treatment system after steam-water separation to reach the standard and be discharged after condensation-adsorption, enabling the condensed waste liquid to enter the waste water treatment system, wherein the operation capacity of the waste gas treatment system is 20m 3 /h。
The utility model utilizes the circulating well system to pump out and inject the polluted groundwater into different aquifers, thereby forming a vertical groundwater flow field between different strata, pumping out and removing the pollutants in the underground soil and the water through continuous circulation, having the advantage of large influence radius in the vertical and horizontal directions, simultaneously overcoming the problem that the pollutants of heterogeneous strata are difficult to quickly migrate, quickly promoting the dissolution and release of the pollutants through the enhanced heating of an in-situ heating well, greatly enhancing the release efficiency and the removal efficiency of the pollutants, ensuring the thorough pumping out and removal of the volatile pollutants with different boiling points, and having no rebound and no secondary pollution risk in the later period of the pollutants.
The utility model relates to a construction and repair method of an enhanced circulation well system, which comprises the following steps:
s1, determining the influence radius of an in-situ heating well and the influence radius of a circulating well through a field pilot scale according to the condition of a project repairing site, wherein the influence radius a of the in-situ heating well 2 is determined to be 5m, the influence radius b of the circulating well 1 is determined to be 20m, and the arrangement of the in-situ heating well and the circulating well on the site is shown in figure 1 according to the principle of point location hexagonal full coverage.
S2, constructing a circulating well system and an in-situ heating system: the circulating well is provided with 1 hole, the length of the circulating well is 10m, the diameter of the circulating well pipe is 35cm, and the circulating well pipe is large in diameter and needs to be drilled through a long spiral drilling machine, so that drilled drilling cuttings are collected and repaired. The installation of the circulating underground well pipe is gradually carried out according to the pipe well sections, a small crane is used for installing the stainless steel circulating well and the internal pipelines, the pump body, the baffle, the monitoring structure and the like of the stainless steel circulating well to a set depth, quartz sand is filled in a screen pipe section between the pipe well and the soil wall, and bentonite is filled in a solid pipe section. The number of the in-situ heating electrode wells is 115, the depth is 10m, a working investigation drill is used for drilling, the electrode wells are arranged in the drilling holes, and the periphery is filled with supported and conductive quartz sand and iron carbon. The heating wells are connected through wires distributed on the ground, and each heating well is heated and regulated by a voltage control switch.
S3, setting the temperature of a heating system to be 85-90 ℃, heating the soil and groundwater in a covered area before the circulation well runs, slowly dissolving pollutants during the period of heating from normal temperature to 60 ℃, and ensuring low concentration and less removal amount of the pollutants in the extraction treatment of the groundwater by the circulation well; with the rise of temperature, more pollutants are dissolved into groundwater from soil, more part of pollutants are volatilized and converted into gas phase, and dissolved pollutants and gas phase pollutants are respectively repaired by a steam-water separation device in the extraction process. In the heating process of the heating temperature of 60-85 ℃, the release efficiency and the volatilization amount of pollutants are maximized, and in the later heating period, as most of pollutants are removed, the extraction efficiency and the extraction amount of pollutants are reduced, and the load of a treatment system for rear-end wastewater and waste gas is reduced.
S4, oxidizing and decomposing the dissolved pollutants in the polluted underground water pumped to the wastewater treatment system through chemical oxidation, and circularly injecting the treated clean water into a proper water-bearing layer in the well body again for vertical circulation; and removing the pollutant-containing waste gas pumped to the waste gas treatment system through activated carbon adsorption to finally reach the standard for emission.
The utility model has the advantages that:
aiming at the property of volatile organic pollutants, the utility model utilizes the characteristic of conductivity of underground water, and based on the traditional circulating well technology, the soil and the underground water are heated in a larger range by the coupled in-situ resistance heating technology, so that on one hand, the dissolution of the pollutants in the soil into the underground water is promoted, on the other hand, the conversion of the extracted pollutants into two forms of gas phase and liquid phase is promoted, and the efficiency of the circulating well for capturing the pollutants is synergistically enhanced;
according to the utility model, the steam-water separator is arranged in the circulating well body, and the extracted polluted underground water is subjected to steam-water separation, so that gas phase and liquid phase respectively enter the waste gas treatment system and the waste water treatment system, the treatment efficiency of pollutants is pertinently enhanced, and the reinjection capacity of the circulating well after the polluted underground water is treated is improved;
the utility model adopts large-scale heating and temperature rising to control the phase state change of volatile organic pollutants in underground soil and underground water at different temperature sections, sequentially enhances the volatilization of pollutants with different boiling points, and is matched with an overground disposal facility to remove the pollutants.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (9)
1. A circulation well system for removing volatile organic contaminants from soil and groundwater comprising: a circulation well and a plurality of in situ resistance heating wells;
the circulating well comprises sieve tubes corresponding to different depth positions of the underground water aquifer and solid tubes connecting two adjacent sieve tube sections, and a baffle for separating the upper aquifer and the lower aquifer is arranged in the circulating well; a water suction pump is arranged in the upper aquifer screen pipe, a water injection pump is arranged in the lower aquifer screen pipe, a water outlet of the water suction pump is connected with an inlet of a steam-water separator through a groundwater extraction pipe, a gas outlet of the steam-water separator is connected with a waste gas treatment system, a water outlet of the steam-water separator is connected with a water inlet of a waste water treatment system, and a water outlet of the waste water treatment system is connected with a water inlet of the water injection pump through a groundwater injection pipe;
a plurality of the in situ resistance heating wells are disposed about the circulation well.
2. The circulation well system of claim 1, wherein a heating electrode and a conductive material are disposed within the in-situ resistive heating well, the heating electrode being coupled to a power conditioning system that is capable of conditioning a power supply current; and a plurality of in-situ resistance heating wells are arranged around the circulating well according to the point hexagonal full-coverage principle.
3. The circulation well system of claim 2, further comprising: a temperature measurement system;
the temperature measuring system comprises a plurality of vertical underground temperature measuring pipes and underground water thermometers which are arranged on the underground temperature measuring pipes at intervals;
the underground water thermometer is connected with the power supply adjusting system.
4. The circulation well system of claim 3, wherein all of the groundwater thermometers are arranged in accordance with the following principles: all heating zones are covered, the planar arrangement is located at the cold spot location of the heating electrode distribution and is evenly distributed in each formation.
5. The circulation well system of claim 3, wherein the temperature measuring system further comprises a pumped groundwater temperature measuring instrument arranged on the groundwater pumping pipe and an injected water temperature measuring instrument arranged on the groundwater injection pipe, a heating component is arranged in the wastewater treatment system, the pumped groundwater temperature measuring instrument and the injected water temperature measuring instrument are connected with the input end of a heating control unit, and the output end of the heating control unit is connected with the heating component.
6. The circulation well system of claim 1, further comprising: a fixed rod;
and the water level meter is installed at the position of the fixed rod corresponding to different depths of the groundwater aquifer, and is linked with the water suction pump and the water injection pump.
7. The circulation well system of claim 1, wherein the barrier is an inflatable barrier, the barrier being coupled to an above-ground control device, the barrier being adjustable in position up and down the circulation well based on the above-ground control device.
8. The circulation well system of claim 1, wherein the wastewater treatment system is an oxidation water treatment system or a reduction water treatment system.
9. The circulation well system of claim 1, wherein the exhaust treatment system is an activated carbon adsorption system or a catalytic combustion system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321353852.XU CN220056422U (en) | 2023-05-30 | 2023-05-30 | Circulation well system for removing volatile organic pollutants in soil and underground water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321353852.XU CN220056422U (en) | 2023-05-30 | 2023-05-30 | Circulation well system for removing volatile organic pollutants in soil and underground water |
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| CN220056422U true CN220056422U (en) | 2023-11-21 |
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| CN202321353852.XU Active CN220056422U (en) | 2023-05-30 | 2023-05-30 | Circulation well system for removing volatile organic pollutants in soil and underground water |
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| CN (1) | CN220056422U (en) |
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2023
- 2023-05-30 CN CN202321353852.XU patent/CN220056422U/en active Active
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