CN112620325A - System and method for heat-enhanced multiphase extraction aiming at aquifer NAPL pollution - Google Patents
System and method for heat-enhanced multiphase extraction aiming at aquifer NAPL pollution Download PDFInfo
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- 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
- B01D53/002—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 condensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
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- C—CHEMISTRY; METALLURGY
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
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- C—CHEMISTRY; METALLURGY
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- 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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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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
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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
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Abstract
The invention provides a heat-enhanced multiphase extraction system and a heat-enhanced multiphase extraction method aiming at the NAPL pollution of an aquifer, and in order to ensure the complete collection of the NAPL pollutants, the system comprises a heat-enhanced system, a vertical extraction pipeline system and a horizontal extraction pipeline system, the heat-enhanced method is adopted to carry out layered regional heating on the underground pollution at a specific depth, and after the saturated vapor pressure of the pollutants in a water phase and a gas phase is rapidly reduced by heating, the NAPL pollutants in the aquifer can be rapidly captured by an extraction pipeline through the continuous vacuum extraction of a double-pump system; and a staged and staged starting mode is adopted to realize the accurate capture of the pollutants, wherein the tail gas containing the gas-phase pollutants pumped out by the horizontal extraction pipe is purified by the tail gas treatment system, and the sewage containing the dissolved pollutants pumped out by the vertical extraction well is purified and repaired by the sewage treatment system to be qualified.
Description
Technical Field
The invention relates to a technology for repairing and treating polluted soil and underground water pollution, in particular to a heat-enhanced multiphase extraction system and a heat-enhanced multiphase extraction method aiming at the NAPL pollution of an aquifer.
Background
In recent years, with the acceleration of urbanization progress and the adjustment of the 'two-in three-out' industrial structure in China, industrial enterprises such as pesticides and chemical engineering in large and medium cities are shut down or moved away from urban areas, and a large number of organic pollution sites are left. Typical organic contaminants of soil and groundwater in contaminated sites include benzene series, petroleum hydrocarbons, organic halides, polycyclic aromatic hydrocarbons, pesticides, polychlorinated biphenyls, and the like. Various soil and groundwater remediation technologies are produced in the market for different pollutants, including two major categories, namely in-situ remediation technologies and ex-situ remediation technologies. The in-situ remediation technology is a remediation technology which is carried out on the in-situ and easily-residual parts of the polluted soil without stirring or moving on the basis of not damaging the basic structure of the soil. The method has the advantages of no need of excavating and moving earthwork, flexible and simple operation, relatively low restoration cost, small environmental influence, capability of reducing the concentration of pollutants to the maximum extent, wide application and capability of treating different types of organic pollutants.
Typical in-situ remediation technologies comprise different types of remediation methods such as in-situ gas phase extraction technology, in-situ bioremediation technology, in-situ soil washing technology, in-situ electromagnetic wave frequency heating technology, in-situ vitrification technology and the like, such as physical, chemical and biological remediation methods. The multi-phase extraction (MPE) technology is an environment-friendly in-situ remediation technology, and the technology is characterized in that soil gas, underground water and a floating oil layer in an underground polluted area are extracted to the ground by a vacuum extraction means to be separated and treated so as to control and remediate organic pollutants in the soil and the underground water and achieve the purpose of site remediation. The multiphase separation refers to a process of gas-liquid and liquid-liquid separation of the extract, the separated gas enters a gas treatment unit, and the liquid is treated by other methods. The oil-water mixed liquid phase can remove the floating oil layer by utilizing the gravity settling principle, and water with low oil content is separated. The method has the advantages of low investment, small disturbance, high restoration efficiency, large restoration range, small occupied area, capability of treating high-concentration polluted soil and the like, and simultaneously treating soil gas, underground water, non-aqueous liquid pollutants (NAPL) and the like in a polluted area.
The current multiphase extraction technology has some problems: 1. the multiphase extraction is realized by applying gas phase pressure gradient and hydraulic gradient in an extraction well by means of vacuum equipment (such as a liquid ring pump and a jet pump) and a water pump, and the corresponding pressure gradient of an underground continuous phase flows into the extraction well, so that dissolved pollutants in underground water are removed while recovery of the gas phase pollutants is enhanced, and the conventional multiphase extraction technology is limited by the permeability of site soil and aquifer media at present and is not suitable for sites with poor permeability or large underground water level change; 2. when the extraction treatment is carried out on non-aqueous phase liquid (NAPL) existing in an aquifer, the NAPL enters the soil and accumulates on the underground water surface due to low solubility to form a layer of free phase substances, and the pollution of the soil aquifer caused by the NAPL is a common serious pollution problem. After NAPL enters the aeration zone and the aquifer, the migration of NAPL is an equilibrium process between gravity and capillary pressure, such as lateral diffusion easily occurs on the low permeability stratum, vertical diffusion occurs under the action of gravity in the high permeability stratum, and the pollutants are divided into light non-aqueous liquid (LNAPL) and heavy non-aqueous liquid (DNAPL) according to specific gravity, wherein the LNAPL is mainly concentrated in the saturation zone (also called capillary zone) of the aquifer to form the polluted interface of the capillary barrier grid, the DNAPL is mainly present in the aeration zone and the aquifer, the soil gas pressure is reduced through the high vacuum effect of the LNAPL pollution, so that the pollutants in the soil pores are released into the soil gas under the action of capillary force and are captured and removed by the vacuum extraction equipment, the relative permeability of NAPL is improved through the high vacuum effect of the DNAPL, and water molecules and the DNPL in the aeration zone are mutually replaced, through lasting vacuum pumping effect for this type of pollutant is caught by vacuum apparatus in the aquifer, but all exist and catch incompletely, and the pollutant remains in soil, and a period of time slowly releases to the groundwater again after restoreing the completion, forms "tailing" and bounce-back phenomenon.
In view of various defects and limitations of the existing multiphase extraction technology treatment method and system for the water-bearing layer NAPL pollutants, the development of a technology which is thorough in repair, free of tailing and rebound, economical and applicable, efficient, energy-saving and high in resource utilization degree has important social significance and environmental significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a heat-enhanced multiphase extraction system and a heat-enhanced multiphase extraction method for aquifer NAPL pollution.
The invention is realized by the following steps:
the invention provides a heat-enhanced multiphase extraction system aiming at the NAPL pollution of an aquifer, which comprises a heat enhancement system, a vertical extraction pipeline system and a horizontal extraction pipeline system, wherein the heat enhancement system comprises a heating well, the heating well is vertically arranged in soil to carry out layered fixed-point heating, the vertical extraction pipeline system comprises a vertical extraction pipe and a matched submersible sewage pump, the vertical extraction pipe is arranged around the heating well and keeps a certain height difference with the heating well, the horizontal extraction pipeline system comprises a horizontal extraction pipe and a matched vacuum pump, and the horizontal extraction pipe is arranged above the soil aquifer.
The system further comprises a wastewater treatment system and a tail gas purification system, wherein the wastewater treatment system consists of an oil-water separator, a chemical oxidation reaction tank, an advanced oxidizer and an activated carbon decoloration tower and is used for treating wastewater extracted by the vertical extraction pipeline system; the tail gas purification system consists of a spray tower, a condensation reactor and a gas-liquid separator and is used for treating gas extracted by the horizontal extraction pipeline system.
The oil-water separator adopts a double-stage filter element oil-water separator, the concentration of oil in tail water is lower than 10ppm, the separated high-concentration NAPL adopts a medicament adding mode to carry out chemical strong oxidation treatment, and an activated carbon decoloring tower is filled with a certain amount of activated carbon catalyst loaded with rare heavy metals (lanthanum, Ce and the like); the condensation reactor adopts a condensing agent cooling mode, tail gas after gas-liquid separation enters an air combustion-supporting pipeline of the heat-intensified burner, and the spray towers are provided with tail gas emergency maintenance loops to the air combustion-supporting pipeline of the heat-intensified burner.
Further, the heat strengthening system also comprises a combustor, a sleeve and a nozzle, wherein the sleeve is sleeved in the heating well, and the combustor provides a heating heat source for the heating well through the nozzle.
Further, the vertical extraction pipe comprises a pipe well, a stainless steel sleeve and a screen pipe.
Furthermore, gravel with the thickness of 3cm-5cm is laid around the horizontal extraction pipe, the horizontal extraction pipe is made of PVC or stainless pipes, air holes are formed in the pipes, and the proportion of the holes formed in the pipes is 60%.
Further, tail gas clean-up system and effluent disposal system all adopt integrated design, and the component equipment all sets up in portable sled dress structure.
Furthermore, the system also comprises a control system, wherein the control system comprises a computer, a PLC, a flowmeter, an adjusting valve, a stop valve, a thermocouple, a pressure transmitter and the like, and the flowmeter, the adjusting valve, the stop valve, the thermocouple and the pressure transmitter are all arranged in the heat strengthening system, the vertical extraction pipeline system, the horizontal extraction pipeline system, the tail gas purification system and the wastewater treatment system and are connected with the PLC and the computer through control cables.
The invention also provides a heat-enhanced multiphase extraction method aiming at the NAPL pollution of the aquifer, the heat-enhanced multiphase extraction system aiming at the NAPL pollution of the aquifer is adopted to carry out layered heating through the heat-enhanced system, soil and underground water with specific depth and range are heated, the underground water in the heating area is extracted and collected through the vertical extraction pipeline, the collected underground water is discharged after reaching the standard after entering the wastewater treatment system for treatment, the waste gas in the heating area is extracted and collected through the horizontal extraction pipeline, and the collected waste gas enters the tail gas purification system for treatment.
Comprises the following steps:
s1, arranging a heating well, and carrying out heat strengthening heating on soil and underground water with a specified depth;
s2, starting a vertical extraction system to extract the underground water; when the temperature of the soil in the aquifer reaches 80 ℃, starting a horizontal extraction system;
s3, the polluted underground water enters a wastewater treatment system for treatment and then is discharged after reaching the standard;
and S4, introducing the waste gas into a tail gas purification system for treatment.
The invention has the following beneficial effects:
1. the invention aims at the multi-phase extraction technology of the heat strengthening of the NAPL pollutants in the aquifer, adopts the heat strengthening mode to heat the water in the aquifer to 50 ℃ and heat the soil to 80 ℃, can effectively ensure the desorption of the pollutants in the soil, realize the migration of the water phase and the gas phase, and better improve the extraction effect.
2. According to the invention, the vertical extraction pipeline, the horizontal extraction pipeline and the well of the heating well are designed, the arrangement distance of the heating well is 5-10 m, the arrangement distance of the vertical pipeline is 5-8 m, the distance of the horizontal extraction pipeline is 10m, and the horizontal extraction pipeline is arranged above the aquifer by adopting a layered heating and layered vertical extraction mode, so that the horizontal extraction pipeline is more beneficial to gas phase collection.
3. The grading starting mode adopted by the invention is better than the system for accurately trapping various phase states of NAPL pollutants, wherein the heat strengthening heating system is started firstly, the vertical extraction system is started after the temperature of the water body in the aquifer reaches 50 ℃, the sewage underground water and dissolved state organic matters in the sewage underground water are extracted, the horizontal extraction system is started after the temperature of the soil in the aquifer reaches 80 ℃, the organic matters desorbed in the soil are extracted, and the thorough collection of NAPL pollutants in various adsorption states is effectively ensured.
4. The tail gas purification system adopted by the invention enriches the organic matters into liquid state and carries out targeted treatment in a spraying and condensing mode, and the remaining non-condensable gas enters the air combustion-supporting pipeline of the heat-enhanced burner through the tail gas loop to carry out burner combustion purification treatment, so that 100% of the remaining organic matters in the non-condensable gas are removed, and secondary pollution to the environment is avoided.
5. The waste water treatment system adopted by the invention adopts the technical routes of oil-water separation, chemical oxidation and advanced oxidation, and achieves the thorough oxidative decomposition of organic matters by adding a proper oxidation medicament and controlling the ozone concentration of the ozone generator, thereby ensuring that the extracted waste water can reach the standard and be discharged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an arrangement structure of a heating well, a vertical extraction pipeline and a horizontal extraction pipeline in a heat-enhanced multi-phase extraction system in an embodiment of the present invention;
FIG. 2 is a sectional view of the heating zone of an embodiment of the present invention;
FIG. 3 is a process flow diagram of the present invention.
In the figure: 1-heating a well; 2-vertical extraction pipe; 3-horizontal extraction tube; 4-waterproof curtain; 5-temperature detection well; 6-gravel; 7-a soil layer; 8-an insulating layer; 9-concrete layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a heat-enhanced multiphase extraction system aiming at the NAPL pollution of an aquifer, which comprises a heat-enhanced system, a vertical extraction pipeline system and a horizontal extraction pipeline system, wherein the heat-enhanced system comprises a heating well, the heating well is vertically arranged in soil to carry out layered fixed-point heating, the vertical extraction pipeline system comprises a vertical extraction pipe and a matched submersible sewage pump, the vertical extraction pipe is arranged around the heating well and keeps a certain height difference with the heating well, the horizontal extraction pipeline system comprises a horizontal extraction pipe and a matched vacuum pump, and the horizontal extraction pipe is arranged on the soil aquifer.
Referring to fig. 1 and 2, a waterproof curtain is adopted to protect an outer layered heating area constructed by a heating well, vertical extraction pipes are arranged around the heating well at intervals, a plurality of temperature detection wells are also arranged in the heating area, the temperature of soil in the heating area can be detected at any time, the vertical extraction system and the horizontal extraction system can be conveniently opened step by step, gravels with the thickness of 3cm-5cm are paved around the horizontal extraction pipes, and an insulating layer and a concrete layer are sequentially arranged above the soil layer in order to maintain the temperature of the soil layer.
The system also comprises a wastewater treatment system and a tail gas purification system, wherein the wastewater treatment system consists of an oil-water separator, a chemical oxidation reaction tank, an advanced oxidizer and an activated carbon decoloration tower and is used for treating wastewater extracted by the vertical extraction pipeline system; the tail gas purification system consists of a spray tower, a condensation reactor and a gas-liquid separator and is used for treating gas extracted by the horizontal extraction pipeline system.
The system also comprises a control system, wherein the control system is composed of a computer, a PLC, a flowmeter, an adjusting valve, a stop valve, a thermocouple, a pressure transmitter and the like, and the flowmeter, the adjusting valve, the stop valve, the thermocouple and the pressure transmitter are all arranged in the heat strengthening system, the vertical extraction pipeline system, the horizontal extraction pipeline system, the tail gas purification system and the wastewater treatment system and are connected with the PLC and the computer through control cables.
Specifically, the heat strengthening system consists of a heating well, a sleeve, a burner and a nozzle, wherein the heating well is vertically arranged in soil for layered fixed-point heating; the system comprises a vertical extraction pipeline system, a pipeline system and a pipeline system, wherein the vertical extraction pipeline system is arranged by adopting a well slave, is arranged around a heating well, keeps a certain height difference with the heating well, and is mainly used for extracting underground water; the horizontal extraction pipeline system is used for extracting gas-phase pollutants generated in the heat strengthening process, is arranged on the upper layer of the aquifer, gravels with the particle size of 3cm-5cm and with a certain thickness are paved in the horizontal extraction area, the horizontal extraction pipe is made of PVC or stainless pipes, the proportion of the holes of the pipes is about 60%, and a good gas flow channel can be formed in the pipeline in the vacuum pump work.
The wastewater treatment system consists of an oil-water separator, a chemical oxidation reaction tank, an advanced oxidizer and an activated carbon decoloration tower, wherein the oil-water separator adopts a two-stage filter element oil-water separator, the concentration of oil in tail water is lower than 10ppm, and high-concentration NAPL separated in the oil-water separator adopts a medicament adding mode to carry out chemical strong oxidation treatment; filling a certain amount of activated carbon catalyst loaded with rare heavy metals (lanthanum, Ce and the like) in the activated carbon decoloring tower; the tail gas purification system comprises a spray tower, a condensation reactor and a gas-liquid separator, wherein the condensation reactor adopts a condensing agent cooling mode, tail gas after gas-liquid separation enters an air combustion-supporting pipeline of the heat-intensified combustor, and the spray tower is provided with tail gas emergency maintenance loops to the air combustion-supporting pipeline of the heat-intensified combustor.
Tail gas purification system and effluent disposal system adopt the integrated design, and the component equipment all sets up in portable sled dress structure, convenient equipment and removal.
Referring to fig. 3, the invention further provides a heat-enhanced multiphase extraction method for aquifer NAPL pollution, the heat-enhanced multiphase extraction system for aquifer NAPL pollution is adopted, layered heating is performed through the heat-enhanced system, soil and underground water with specific depth and range are heated, the underground water in a heating area is extracted and collected through a vertical extraction pipeline, the collected underground water is discharged after entering a wastewater treatment system for treatment, extraction and collection treatment are performed on waste gas in the heating area through a horizontal extraction pipeline, and the collected waste gas enters a tail gas purification system for treatment.
Specifically, the method comprises the following steps:
step 1: carrying out heat strengthening heating on soil and underground water with a specified depth, keeping the heating temperature of a burner at about 150-200 ℃ in the heating process, and arranging heating wells by combining the characteristics of the depth, thickness and pollutants of an aquifer, wherein the spacing between the heating wells is within the range of 5-10 m and the regular quadrilateral arrangement is adopted;
step 2: starting a vertical extraction system to extract liquid-phase underground water, extracting polluted underground water, determining the lift of a water pump according to the depth of the underground water and the on-way pressure loss, designing the arrangement of a vertical extraction well according to the soil permeability coefficient and the depth of an aquifer, wherein the arrangement interval is 5-8 m, starting a horizontal extraction system when the heating temperature of the aquifer soil reaches 80 ℃ by heat strengthening, reducing the gas phase saturation vapor pressure of NAPL pollutants by heating, promoting more water-phase pollutants and soil adsorption-state pollutants to be changed into gas phase, and extracting the gas phase from the horizontal extraction system, wherein the vacuum degree of the horizontal extraction system is ensured to be 40-90 kpa, and the arrangement interval is 10 m;
and step 3: the polluted underground water extracted in the step 2 enters a wastewater treatment system, oil-water separation is carried out after the polluted underground water passes through an oil-water separator, oil-phase pollutants are independently collected and then are added with 10-20% of oxidation agents in mass ratio for complete oxidation treatment, the rest wastewater enters a chemical oxidation reaction tank, a Fenton reagent is added for primary oxidation treatment, the oxidation effect is about 50%, then the polluted underground water enters an advanced oxidizer, after secondary ozone oxidation treatment, the ozone concentration is 10-30 mg/L, 95% of organic matters in the wastewater are oxidized and decomposed into carbon dioxide and water and a small amount of micromolecular organic matters, finally the polluted underground water is conveyed to an active carbon decoloring tower through a slurry pump at the outlet of the advanced oxidizer, the active carbon is modified by rare heavy metals (lanthanum, Ce and the like) and has certain catalytic decomposition capacity, the clear liquid is guaranteed to be catalytically decomposed again in the decoloring process, the decomposition rate, the emission standard is met;
and 4, step 4: the waste gas extracted in the step 2 passes through a spray tower, the temperature of the waste gas is reduced from 120 ℃ to about 60 ℃, 99.5% of dust in the waste gas is removed in the spraying process, then the waste gas passes through an air cooling condensation reactor, the temperature is further reduced to about 10 ℃, the condensed waste gas enters a gas-liquid separator for gas-liquid separation treatment, about 70% -85% of organic matters in the gas can be enriched to a liquid phase in the steps, the condensed and separated liquid phase pollutants are collected in a centralized manner through the gravity flow effect and then are treated independently by adopting the oil phase pollutants in the step 3, the gas-liquid separated noncondensable gas enters a heat-enhanced combustor air combustion pipeline through a tail gas loop for combustor combustion purification treatment, and 100% of the residual organic matters in the noncondensable gas is removed.
Aiming at the heterogeneous condition of a soil aquifer, in order to ensure the thorough collection of NAPL pollutants, the invention adopts a heat strengthening means to carry out layered and regional heating on the underground pollution at a specific depth, rapidly reduces the saturated vapor pressure of the pollutants in a water phase and a gas phase by heating, and then leads the NAPL pollutants in the aquifer to be rapidly captured by an extraction pipeline through continuous vacuum extraction of a double pump system, wherein the extraction pipeline consists of a vertical extraction well and a horizontal extraction well, the saturated gas extracted by the horizontal extraction pipeline is purified by a tail gas treatment system, and the sewage extracted by the vertical extraction well is purified and repaired by a sewage treatment system to be qualified.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A thermally enhanced multiphase extraction system for aquifer NAPL contamination, characterized by: including heat strengthening system, vertical extraction pipe-line system and horizontal extraction pipe-line system, heat strengthening system includes the heating well, and the heating well is arranged perpendicularly in soil in order to carry out layering fixed point heating, vertical extraction pipe-line system includes vertical extraction pipe and supporting stealthily dirty pump, and vertical extraction pipe sets up around the heating well to keep certain difference in height with the heating well, horizontal extraction pipe-line system includes horizontal extraction pipe and supporting vacuum pump, horizontal extraction pipe sets up on soil aquifer.
2. The thermally enhanced multiphase extraction system for aquifer NAPL contamination of claim 1, wherein: the system also comprises a wastewater treatment system and a tail gas purification system, wherein the wastewater treatment system consists of an oil-water separator, a chemical oxidation reaction tank, an advanced oxidizer and an activated carbon decoloration tower and is used for treating wastewater extracted by the vertical extraction pipeline system; the tail gas purification system consists of a spray tower, a condensation reactor and a gas-liquid separator and is used for treating gas extracted by the horizontal extraction pipeline system.
3. The thermally enhanced multiphase extraction system for aquifer NAPL contamination of claim 2, wherein: the heat strengthening system further comprises a combustor, a sleeve and a nozzle, the sleeve is sleeved in the heating well, and the combustor provides a heating heat source for the heating well through the nozzle.
4. The thermally enhanced multiphase extraction system for aquifer NAPL contamination of claim 2, wherein: the vertical extraction pipe comprises a pipe well, a stainless steel sleeve and a sieve pipe.
5. The thermally enhanced multiphase extraction system for aquifer NAPL contamination of claim 2, wherein: gravel with the thickness of 3cm-5cm is laid around the horizontal extraction pipe, the horizontal extraction pipe is made of PVC or stainless pipes, air holes are formed in the pipes, and the proportion of the holes in the pipes is 60%.
6. The thermally enhanced multiphase extraction system for aquifer NAPL contamination of claim 2, wherein: the tail gas purification system and the wastewater treatment system are integrally designed, and the equipment is arranged in a movable skid-mounted structure.
7. The thermally enhanced multiphase extraction system for aquifer NAPL contamination according to any one of claims 2 to 6, wherein: still include control system, control system comprises computer, PLC, flowmeter, governing valve, trip valve, thermocouple, pressure transmitter etc. flowmeter, governing valve, trip valve, thermocouple, pressure transmitter all install in thermal strengthening system, vertical extraction pipe-line system, horizontal extraction pipe-line system, tail gas clean-up system, effluent disposal system to be connected with PLC and computer through control cable.
8. The heat-enhanced multiphase extraction method aiming at the NAPL pollution of the aquifer is characterized in that the heat-enhanced multiphase extraction system aiming at the NAPL pollution of the aquifer is adopted according to any one of claims 1 to 7, the heat-enhanced multiphase extraction system is used for heating soil and underground water with specific depth and range, a vertical extraction pipeline is used for extracting and collecting the underground water in a heating area, the collected underground water enters a wastewater treatment system for treatment and then is discharged after reaching the standard, a horizontal extraction pipeline is used for extracting and collecting waste gas in the heating area, and the collected waste gas enters a tail gas purification system for treatment.
9. The thermally enhanced multiphase extraction process for aquifer NAPL contamination of claim 8, wherein: the method comprises the following steps:
s1, arranging a heating well, and carrying out heat strengthening heating on soil and underground water with a specified depth;
s2, starting a vertical extraction system to extract the underground water; when the temperature of the soil in the aquifer reaches 80 ℃, starting a horizontal extraction system;
s3, the polluted underground water enters a wastewater treatment system for treatment and then is discharged after reaching the standard;
and S4, introducing the waste gas into a tail gas purification system for treatment.
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