CN111215440A - Organic contaminated soil in-situ alternate electric heating desorption system - Google Patents
Organic contaminated soil in-situ alternate electric heating desorption system Download PDFInfo
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- CN111215440A CN111215440A CN201910965155.1A CN201910965155A CN111215440A CN 111215440 A CN111215440 A CN 111215440A CN 201910965155 A CN201910965155 A CN 201910965155A CN 111215440 A CN111215440 A CN 111215440A
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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
- B09C1/062—Reclamation of contaminated soil thermally by using electrode or resistance heating elements
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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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Abstract
The invention discloses an in-situ alternative electric heating desorption system for organic contaminated soil, which comprises a soil heating unit, a gas heat exchange and condensation unit, a tail gas treatment unit and a wastewater treatment unit, wherein the soil heating unit comprises a plurality of small heating units and a plurality of extraction wells, and each extraction well is provided with an air stripping pipe; each small heating unit comprises two groups of control units, and each small heating unit controls the heating rod to be opened and closed alternately through a PLC control system; the gas stripping pipe output end is connected with the gas heat exchange condensation unit, and the gas output end of the gas heat exchange condensation unit is connected with the tail gas treatment unit, and the liquid output end of the gas heat exchange condensation unit is connected with the wastewater treatment unit. The invention can realize accurate temperature regulation, not only can prolong the service life of the heating rod, but also can save energy, has no secondary pollution, has a pollutant removal rate of 99.9 percent, and is suitable for repairing various organic pollution sites such as VOCs/SVOCs.
Description
Technical Field
The invention relates to the technical field of soil remediation equipment, in particular to an in-situ alternate electric heating desorption system for organic contaminated soil.
Background
The development of urbanization and the adjustment of industrial structural layout lead to the shutdown, production-breaking or relocation of many historical industrial enterprises, and the sites left by these enterprises have soil and underground water pollution of different degrees, and the main pollutants include Persistent Organic Pollutants (POPs), semi-volatile organic pollutants (SVOCs), volatile organic pollutants (VOCs), heavy metals, total petroleum hydrocarbons, pesticides and other pollutants with strong toxicity and serious harm. At present, the soil remediation means is mainly divided into ectopic remediation and in-situ remediation. As a technical means for soil remediation, in-situ thermal desorption is an in-situ soil remediation technology for volatile and semi-volatile organic matter contaminated sites. According to different heating modes, the in-situ thermal desorption repair technology can be divided into a steam enhanced extraction technology, a resistance heating technology and a heat conduction technology. The heat conduction technology can be divided into two heat energy input forms of gas heat conduction and electric heat conduction. According to different pollution degrees of sites, the repairing time is generally 6-12 months, the repairing depth can reach more than 20m, and the pollution removal degree can reach more than 99%. The in-situ thermal desorption technology is suitable for the soil remediation and treatment of NAPLs-phase-containing polluted soil, heavily-polluted soil and polluted source areas, is particularly suitable for polluted areas which are difficult to carry out ex-situ remediation, such as strict atmospheric pollution control, difficult transportation and the like, and has better remediation effect on organic polluted soil such as Polycyclic Aromatic Hydrocarbons (PAHs), pesticides, petroleum, polychlorinated biphenyl (PCBs), polybrominated diphenyl ethers (PBDEs), polychlorinated biphenyl (PCBs) and the like. The method has the characteristics of being beneficial to pollution control, needing no transfer treatment, being short in construction period, high in removal rate, having remarkable repairing effect on low-permeability soil and fields with deep pollution depth and the like, and becomes an in-situ repairing technology with wide prospect.
At present, the traditional in-situ thermal desorption heating systems are uniformly controlled to be started, and when the heating systems are started, the heat cannot be quickly conducted outwards due to the low thermal conductivity of a soil body and the influence of a heating sleeve effect, so that the local temperature is too high, and the heating rods are easily damaged due to overheating; when the device is closed uniformly, the soil body is cooled completely, and the temperature needs to be raised again, so that the heat efficiency is lower. In order to guarantee the service life of the heating rod, only the heating rod with low power can be used for long-term heating, the upper limit of the heating temperature is low, the temperature difference is too small, the construction period is long, and the economical efficiency is seriously influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing an in-situ alternative electric heating desorption system for organic contaminated soil, which can effectively reduce the influence of a thermal sleeve effect, simultaneously ensure the continuous heat energy supply of a soil body, ensure the service life of a heating rod by alternately carrying out overheat cooling protection on the high-power heating rod, improve the heat efficiency, shorten the construction period and save energy, and has the advantages of green cleanness and no secondary pollution because waste gas and waste water generated by the system are adsorbed by activated carbon, blown off by a blow-off tower and are thoroughly oxidized by a Fenton oxidation medicament.
The invention solves the technical problems by the following technical scheme:
the in-situ alternate electrical heating desorption system for the organic contaminated soil comprises a soil heating unit, a gas heat exchange and condensation unit, a tail gas treatment unit and a wastewater treatment unit, wherein the soil heating unit is arranged in an in-situ soil remediation area and is provided with a plurality of small heating units and a plurality of extraction wells, and each extraction well is internally provided with an air stripping pipe; each small heating unit comprises two groups of control units, each group of control units consists of a plurality of heating wells, a heating rod is installed in each heating well, and the heating rods of the two groups of control units are alternatively controlled to be opened and closed by each small heating unit through a PLC control system; the gas stripping pipe output end of the soil heating unit is connected with the gas heat exchange condensation unit, the gas output end of the gas heat exchange condensation unit is connected with the tail gas treatment unit, and the liquid output end of the gas heat exchange condensation unit is connected with the wastewater treatment unit.
Two groups of control units in each small heating unit are respectively provided with three heating rods arranged in an equilateral triangle shape, and the heating rods of the two groups of control units are alternately arranged to form an equilateral hexagon.
Each small heating unit is internally provided with a temperature measuring well, a pressure measuring well and an extraction well, and the extraction well is arranged in the middle of the small heating unit; a pressure sensor is placed in the pressure measuring well, a K-type thermocouple temperature measuring tube is placed in the temperature measuring well, and the pressure sensor and the K-type thermocouple temperature measuring tube are connected to a PLC control system through sensing lines.
The soil heating unit is characterized in that a closed bentonite impervious wall is arranged on the outer side of the soil heating unit, the soil moistening impervious wall is 2.5m away from the boundary of the in-situ soil remediation area, and the impervious wall penetrates through a permeable layer in the contaminated soil and then extends into a impermeable layer so as to prevent groundwater from permeating into the remediation area to influence the heating effect.
And a heat insulation layer is arranged above the in-situ soil restoration area and mainly comprises an aluminum silicate felt at the lower layer and a firebrick layer at the upper layer.
The gas heat exchange condensation unit comprises a tubular heat exchanger and a gas-water separator, the output end of a gas stripping pipe of the soil heating unit is connected with the shell pass of the tubular heat exchanger, the gas-water separator is connected with the gas output end of the shell pass of the tubular heat exchanger, the liquid output end of the shell pass of the tubular heat exchanger and the liquid output end of the gas-water separator are both connected with a sewage storage tank, and the gas output end of the gas-water separator is connected with a tail gas treatment unit.
The waste water treatment unit comprises a regulating tank, an oxidation tank, a stripping tower and a tail gas treatment unit which are sequentially connected, wherein an oxidation agent storage tank is connected with the oxidation tank, a flocculating agent storage tank and an air blowing device are connected with the stripping tower, and the gas output end of the stripping tower is connected with the tail gas treatment unit.
The tail gas treatment unit comprises two groups of activated carbon storage tanks connected in parallel, each group of activated carbon storage tank is provided with one or two activated carbon storage tanks, and the two groups of activated carbon storage tanks are sequentially connected with a draught fan and a chimney at the tail end of a converging pipeline.
Compared with the prior art, the in-situ alternate electric heating desorption system for the organic contaminated soil has the following advantages:
1. according to the invention, the heating rods are alternately controlled by the PLC control system, the temperature for heating soil is accurately regulated and controlled by the temperature control equipment, the service life of the heating rods is prolonged, and the operation cost of the equipment is reduced.
2. The invention adopts the heating rods arranged in a hexagon shape, and the control units divided into 2 groups of equilateral triangles are used for heating alternately, thus effectively avoiding the difficulty of temperature concentration and diffusion caused by the heat jacket effect, reducing the heat loss caused by integral stop, and continuously supplying energy through the alternating high temperature difference to improve the heat efficiency and shorten the construction period.
3. The system can thoroughly remove pollutants in the tail gas, is efficient, green, clean and free of secondary pollution, has the pollutant removal rate of over 99 percent, and can be applied to the repair of various organic pollution fields such as VOCs, SVOCs and the like.
Drawings
FIG. 1 is a process flow diagram of an in-situ alternate electric heating desorption system for organic contaminated soil according to the present invention.
Fig. 2 is a schematic structural diagram of the in-situ alternate electric heating desorption system for organic contaminated soil.
FIG. 3 is a schematic plan view of a heating zone of the in-situ alternate electrically heated desorption system for organic contaminated soil according to the present invention.
FIG. 4 is a schematic sectional view of the middle part of a heating zone of the in-situ alternate electric heating desorption system for organic contaminated soil according to the present invention.
FIG. 5 is a schematic sectional view of the boundary of the heating zone of the in-situ alternate electrically heated desorption system for organic contaminated soil according to the present invention.
Fig. 6 is a plan view of a two-field soil heating zone in example 1 of the present invention.
In the figure: 1. a heating well; 1-1, a heating well a; 1-2, heating a well b; 2. temperature measurement well; 3. logging a well; 4. an extraction well; 5. a refractory brick; 6. an aluminum silicate felt; 7. a soft water tank; 8. a plate heat exchanger; 9. a first circulating water pump; 10. a tubular heat exchanger; 11. a second circulating water pump; 12. a gas-water separator; 13. a sewage storage tank; 14. a cooling water tower; 15. a first activated carbon storage tank; 16. a first chimney; 17. a first induced draft fan; 18. a first water pump; 19. a regulating tank; 20. a water pump II; 21. an oxidizing agent storage tank; 22. a flocculant storage tank; 23. a first pump; 24. a second pump; 25. an oxidation pond; 26. a temporary storage tank for the flocculant; 27. a stripping tower; 28. an air blowing device; 29. a third pump; 30. a second active carbon storage tank; 31. a second induced draft fan; 32. a second chimney; 33. an equilateral hexagonal control unit; 34. a cut-off wall; 35. a soil heating unit; 36. a wastewater treatment unit; 37. a gas heat exchange condensing unit; 38. and a tail gas treatment unit.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular and non-limiting description of the present invention will now be made in connection with the accompanying drawings and examples of application. The drawings in the following description relate to only some embodiments of the invention and are not intended to limit the invention.
As shown in fig. 1 and 2, the in-situ alternate electrical heating desorption system for organic contaminated soil of the invention comprises a soil heating unit 35, a gas heat exchange condensation unit 37, a tail gas treatment unit 38 and a wastewater treatment unit 36, wherein the soil heating unit 35 is installed in an in-situ soil remediation area, the soil heating unit 35 comprises a plurality of equilateral hexagonal control units 33 which are arranged in succession and a plurality of extraction wells 4, and each extraction well 4 is provided with a gas stripping pipe; each equilateral hexagon control unit 33 is composed of two groups of control units, each group of control units is provided with a plurality of heating wells 1, one group of control units is composed of three heating wells a 1-1 which are distributed in an equilateral triangle shape, the other group of control units is composed of three heating wells b1-2 which are distributed in an equilateral triangle shape, heating rods are arranged in the heating wells a 1-1 and the heating wells b1-2, the heating rods of the two groups of control units are alternately distributed to form an equilateral hexagon, and the two groups of control units alternately control the opening and closing of the heating rods of the two groups of control units through a PLC control system; the output end of the gas stripping pipe of the soil heating unit 35 is connected with the gas heat exchange condensation unit 37, the gas output end of the gas heat exchange condensation unit 37 is connected with the tail gas treatment unit 38, and the liquid output end of the gas heat exchange condensation unit 37 is connected with the wastewater treatment unit 36.
As shown in fig. 3, each equilateral hexagonal control unit 33 is provided with a temperature measuring well 2, a pressure measuring well 3 and an extraction well 4, the extraction well 4 is located in the middle of the equilateral hexagonal control unit 33, and the extraction pressure of the extraction well 4 is controlled to be 0-4 kPa; a pressure sensor is placed in the pressure well 2, a K-type thermocouple temperature measuring tube is placed in the temperature well 2, and the pressure sensor and the K-type thermocouple temperature measuring tube are connected to a PLC control system through sensing wires.
As shown in fig. 4 and 5, a closed bentonite impervious wall 34 is arranged on the outer side of the soil heating unit 35, the bentonite impervious wall 34 is 2.5m away from the boundary of the in-situ soil remediation area, and the impervious wall 34 penetrates through a permeable layer in the contaminated soil and then extends into the impermeable layer, so as to prevent groundwater from penetrating into the remediation area to affect the heating effect.
And a heat insulation layer is arranged above the in-situ soil restoration area and mainly comprises an aluminum silicate felt 6 at the lower layer and a refractory brick layer 5 at the upper layer. The laying steps of the heat insulation layer are as follows: firstly, 15mm of aluminum silicate felt 6 is paved, then 120mm of light castable is paved on the aluminum silicate felt 6, and finally 70mm of refractory bricks 5 are paved on the upper layer.
The gas heat exchange condensation unit 37 comprises a tubular heat exchanger 10, a gas-water separator 12 and a plate heat exchanger 8, the output end of a gas stripping pipe of the soil heating unit 35 is connected with the shell side of the tubular heat exchanger 10, the gas output end of the shell side of the tubular heat exchanger 10 is connected with the gas-water separator 12, the liquid output ends of the shell side of the tubular heat exchanger 10 and the gas-water separator 12 are both connected with a sewage storage tank 13, and the gas output end of the gas-water separator 12 is connected with a tail gas treatment unit 38; the tube side of the tubular heat exchanger 10 is connected with a circulating cooling water pipe, the circulating cooling water pipe is sequentially connected with a plate heat exchanger 8, a first circulating water pump 9 and a soft water tank 7, the plate heat exchanger 8 is connected with a cooling water tower 14 through a pipeline, and a second circulating water pump 11 is installed on the pipeline. The gas heat exchange condensing unit 37 is cooled by circulating water, gas enters the shell pass of the tubular heat exchanger 10, after heat exchange, hot circulating water is pumped into the hot end of the plate heat exchanger 8 by the first circulating water pump 9 to be cooled and then enters the cooling water tower 14 to be further cooled, the cooled circulating water is pumped into the cold end of the plate heat exchanger 8 by the second circulating water pump 11 and then enters the tube pass of the tubular heat exchanger 10 through the soft water tank 7, and the heat exchange system can periodically supplement soft water according to a liquid level meter in the soft water tank 7 during operation. The waste water generated by the tubular heat exchanger 10 and the gas-water separator 12 is temporarily stored in a sewage storage tank 13.
The tail gas treatment unit 38 is provided with two groups of first activated carbon storage tanks 15 connected in parallel, each group of first activated carbon storage tanks 15 is provided with two activated carbon storage tanks connected in series, and the two groups of first activated carbon storage tanks 15 are sequentially connected with a first induced draft fan 17 and a first chimney 16 at the tail end of a converging pipeline.
Waste water treatment unit 36 is including the equalizing basin 19 that meets in proper order, oxidation pond 25, blow off tower 27 and two 30 active carbon storage tanks, the sewage storage tank 13 is connected through a suction pump 18 to the end of intaking of equalizing basin 19, oxidation medicament storage tank 21 connects oxidation pond 25 through a pump 23, flocculating agent storage tank 22 connects the temporary storage tank 26 of flocculating agent through two 24 pumps, the temporary storage tank 26 of flocculating agent connects blow off tower 27, air blowing device 28 is installed to the bottom of blow off tower 27, two 30 active carbon storage tanks of two parallel connection are connected to the gas output end of blow off tower 27, two 30 active carbon storage tanks connect gradually draught fan two 31, two 32 chimneys at converging the pipeline end.
As shown in fig. 1, the working process of the system of the present invention is: after the soil is heated by the electric heating rod of the soil heating unit 35, the generated gas is pumped out through the gas stripping pipe; the waste gas containing organic pollutants is cooled and cooled by the gas heat exchange condensation unit 37, and the organic pollutants with high boiling points are condensed and then are gathered into the sewage storage tank 13. The uncondensed gas enters a gas-water separator 12 to be separated into water and gas, the low-boiling organic pollutants enter an activated carbon storage tank I15, the residual organic pollutants are removed through activated carbon adsorption, the purified tail gas is discharged to the atmosphere through a chimney I16 after reaching the standard, and the waste water generated by separation and containing part of the organic pollutants enters a sewage storage tank 13. And the wastewater in the wastewater storage tank 13 is pumped into an adjusting tank 19 of a wastewater treatment unit 36 through a first water suction pump 18, and is subjected to wastewater treatment after the pH value is adjusted, and finally the wastewater is discharged after reaching the standard.
The modified activated carbon is filled in the activated carbon storage tank, and the filled modified activated carbon can efficiently adsorb macromolecular organic pollutants in tail gas.
The working principle of the gas heat exchange condensation unit 37 of the present invention is as follows: wastewater containing pollutants generated by condensation heat exchange of gas and wastewater with part of target pollutants left generated by gas-water separation are converged into a sewage storage tank, and the wastewater in the sewage storage tank reaches a certain standard and then is pumped into a regulating tank 19 to regulate the pH value.
The working principle of the wastewater treatment unit 36 of the invention is as follows: waste water generated by condensation and gas-water separation is pumped into an adjusting tank 19 by a first water pump 18 to adjust the pH value, then pumped into an oxidation tank 25 by a second water pump 20 to be added with a chemical oxidation agent to carry out chemical oxidation to completely remove most of organic pollutants, the oxidized waste water enters a stripping tower 27 to be further subjected to advanced treatment to completely remove the organic pollutants, and is discharged by a third pump 29, and generated tail gas is pumped out by a second induced draft fan 31, adsorbed by a second activated carbon storage tank 30 and then discharged by a second chimney 32 to reach the standard.
The air blowing-off tower 27 of the invention is provided with an air blowing-in device 28, air is blown into the wastewater through the air blowing-in device 28 to blow off organic matters from the water, and flocculating agents are added periodically to carry out flocculation and precipitation to thoroughly remove pollutants.
The first chimney 16 and the second chimney 32 are both stainless steel cylinder structures with the height of 15 m.
The depth and the distance of the heating rods can be designed according to the concentration and the depth of pollutants.
The following are examples of the use of the present invention:
2 organic pollution sites with basically consistent pollution conditions are selected and repaired in 96 square meters, and the organic pollution sites are respectively marked as an A site and a B site, main pollutant types of the sites comprise 3 SVOCs (α -hexachloro, β -hexachloro and 1 VOCs (trichloromethane), the pollution depth is 8 meters, and the pollution conditions are shown in table 1.
TABLE 1 basic cases of contaminants
The arrangement of the heating well, the extraction well, the temperature measuring well and the pressure measuring well of the field soil heating unit in the example is shown in figure 6.
In the example, the site A soil heating unit adopts the traditional low-power heating rod technology without alternative control arrangement, and the site B soil heating unit adopts the system to alternately control the high-power heating rod. The heating wells are arranged in an equilateral hexagon, the distance between every two heating wells is 2 meters, and each hexagonal unit is provided with an extraction well, a temperature measuring well and a pressure measuring well. And an impermeable layer and a heat insulation layer are respectively arranged on the two sites. Heating repair is carried out through different control modes, and the specific operation steps are as follows:
① A, the power of a heating rod of the site is 0.8kw/m, and the power is continuously electrified and heated until the pollutant in the site is repaired;
secondly, the power of heating rods of the site B is 1.5kw/m, the heating rods are controlled in groups according to an equilateral triangle control unit, one group is started to heat to 600 ℃, the group is closed through temperature control, overheating cooling protection is carried out on the group, the other group is switched to heat, and the heating rods are alternately started until the pollutant in the site is repaired.
and other conditions such as extraction in two fields in the whole restoration process are consistent.
And stopping heating when the temperature rises and the system online monitoring system observes that the extracted tail gas has no pollutants, preserving the heat for 5 days, and sampling to detect the removal condition of the pollutants in the soil after the temperature is reduced to 50 ℃, wherein the specific conditions are shown in table 2. Wherein the total time length of the site A repair is 135 days, and the total time length of the site B repair is 120 days. The restoration result shows that the soil temperature of the two sites can reach the target temperature after restoration, the pollutant concentration is obviously reduced, the soil temperature can reach the restoration target value, and the removal efficiency can reach more than 99%. In order to avoid faults such as short circuit and burnout caused by overheating of the heating rods, the site A adopts the low-power heating rods, but the local overheating caused by the hot jacket effect cannot be solved in the continuous heating process, 3 electric heating rods are replaced due to damage in the process, and the heating rods in the site B do not have faults. The repairing period of the site A is 15 days later than that of the site B (wherein the system is powered off, shut down, replaced by a heating rod and delayed for 1.5 days, and the system is restarted after replacement, heated, replenished, lost temperature and delayed for 4.5 days). After cost accounting (the specific economic index is shown in table 3), the total investment (total investment is 90.87 ten thousand yuan) of the site B repair mode is 24.69 ten thousand yuan (22.1%) less than that of the site A (total investment is 115.56 ten thousand yuan), and the cost of operating and maintaining energy and equipment is greatly reduced. And the tail gas discharged by the system is sampled and detected regularly during the operation period, and the result can be discharged after reaching the standard. The environmental quality monitoring is also carried out on the periphery of the project during the operation, and the pollution of the project to the periphery environment is not found. The invention has the advantages of reducing energy consumption, saving cost, shortening construction period, being green and clean, having no secondary pollution and the like.
TABLE 2 repair results
TABLE 3 comparison summary of economic indicators for two different control modes
Claims (8)
1. An in-situ alternate electrical heating desorption system for organic contaminated soil is characterized by comprising a soil heating unit, a gas heat exchange and condensation unit, a tail gas treatment unit and a wastewater treatment unit, wherein the soil heating unit is arranged in an in-situ soil remediation area and comprises a plurality of small heating units and a plurality of extraction wells, and each extraction well is internally provided with a gas stripping pipe; each small heating unit is provided with two groups of control units, each group of control units consists of a plurality of heating wells, a heating rod is installed in each heating well, and each small heating unit controls the heating rods of the two groups of control units to be opened and closed alternately through a PLC control system; the gas stripping pipe output end of the soil heating unit is connected with the gas heat exchange condensation unit, the gas output end of the gas heat exchange condensation unit is connected with the tail gas treatment unit, and the liquid output end of the gas heat exchange condensation unit is connected with the wastewater treatment unit.
2. The in-situ alternating electric heating desorption system for organic contaminated soil according to claim 1, wherein the two groups of control units in each small heating unit are respectively provided with three heating rods arranged in an equilateral triangle, and the heating rods of the two groups of control units are alternately arranged to form an equilateral hexagon.
3. The in-situ alternate electric heating desorption system for the organic contaminated soil according to claim 1 or 2, wherein each small heating unit is provided with a temperature measuring well, a pressure measuring well and an extraction well, and the extraction well is arranged in the middle of the small heating unit; a pressure sensor is placed in the pressure measuring well, a K-type thermocouple temperature measuring tube is placed in the temperature measuring well, and the pressure sensor and the K-type thermocouple temperature measuring tube are connected to a PLC control system through sensing lines.
4. The in-situ alternate electric heating desorption system for the organically-polluted soil according to claim 1 or 2, wherein a closed bentonite impervious wall is arranged on the outer side of the soil heating unit, the bentonite impervious wall is 2.5m away from the boundary of the in-situ soil remediation area, and the impervious wall penetrates through a permeable layer in the polluted-depth soil and then extends into the impermeable layer so as to prevent groundwater from penetrating into the remediation area to influence the heating effect.
5. The in-situ alternate electric heating desorption system for the organic contaminated soil according to claim 1 or 2, wherein a heat insulation layer is arranged above the in-situ soil remediation zone, and the heat insulation layer mainly comprises a lower aluminum silicate felt layer and an upper refractory brick layer.
6. The in-situ alternate electrically heated desorption system for organic contaminated soil according to claim 1 or 2, wherein the gas heat exchange condensation unit comprises a tubular heat exchanger and a gas-water separator, the output end of the gas stripping pipe of the soil heating unit is connected with the shell side of the tubular heat exchanger, the gas output end of the shell side of the tubular heat exchanger is connected with the gas-water separator, the liquid output end of the shell side of the tubular heat exchanger and the liquid output end of the gas-water separator are both connected with a sewage storage tank, and the gas output end of the gas-water separator is connected with a tail gas treatment unit.
7. The in-situ alternate electric heating desorption system for the organic contaminated soil according to claim 1 or 2, wherein the wastewater treatment unit comprises a regulating pond, an oxidation pond, a stripping tower and a tail gas treatment unit which are connected in sequence, the oxidation pond is connected with an oxidation agent storage tank, the stripping tower is connected with a flocculant storage tank and an air blowing device, and a gas delivery end of the stripping tower is connected with the tail gas treatment unit.
8. The in-situ alternate electric heating desorption system for the organic contaminated soil according to claim 1 or 7, wherein the tail gas treatment unit comprises two groups of activated carbon storage tanks connected in parallel, each group of activated carbon storage tank is provided with one or two activated carbon storage tanks, and the two groups of activated carbon storage tanks are sequentially connected with an induced draft fan and a chimney at the tail end of a converging pipeline.
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| CN113182343A (en) * | 2021-01-11 | 2021-07-30 | 中国科学院生态环境研究中心 | Device and method for repairing organic contaminated soil by using resistance heating coupling oxidant |
| CN114011863A (en) * | 2021-10-25 | 2022-02-08 | 吴东海 | Stack type thermal desorption technology |
| CN114101305A (en) * | 2022-01-27 | 2022-03-01 | 北京高能时代环境技术股份有限公司 | In-situ low-temperature enhanced chemical oxidation remediation system and method for organic contaminated site |
| WO2022122554A1 (en) * | 2020-12-08 | 2022-06-16 | Haemers Technologies Societe Anonyme | Combination of in-situ thermal desorption and chemical treatment |
| AT526266A1 (en) * | 2022-07-07 | 2024-01-15 | Gm Remediation Systems Gmbh | Heating device for insertion into a well shaft for heating a soil layer contaminated with pollutants in order to clean this soil layer |
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- 2019-10-11 CN CN201910965155.1A patent/CN111215440A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022122554A1 (en) * | 2020-12-08 | 2022-06-16 | Haemers Technologies Societe Anonyme | Combination of in-situ thermal desorption and chemical treatment |
| BE1028861B1 (en) * | 2020-12-08 | 2022-07-12 | Haemers Tech Societe Anonyme | Combination of thermal desorption and in situ chemical treatment |
| CN113182343A (en) * | 2021-01-11 | 2021-07-30 | 中国科学院生态环境研究中心 | Device and method for repairing organic contaminated soil by using resistance heating coupling oxidant |
| CN113182343B (en) * | 2021-01-11 | 2022-05-13 | 中国科学院生态环境研究中心 | Device and method for repairing organic contaminated soil by using resistance heating coupling oxidant |
| CN114011863A (en) * | 2021-10-25 | 2022-02-08 | 吴东海 | Stack type thermal desorption technology |
| CN114101305A (en) * | 2022-01-27 | 2022-03-01 | 北京高能时代环境技术股份有限公司 | In-situ low-temperature enhanced chemical oxidation remediation system and method for organic contaminated site |
| AT526266A1 (en) * | 2022-07-07 | 2024-01-15 | Gm Remediation Systems Gmbh | Heating device for insertion into a well shaft for heating a soil layer contaminated with pollutants in order to clean this soil layer |
| AT526266B1 (en) * | 2022-07-07 | 2024-03-15 | Gm Remediation Systems Gmbh | Heating device for insertion into a well shaft for heating a soil layer contaminated with pollutants in order to clean this soil layer |
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