CN103203355A - Ectopic thermal desorption treatment method of polluted soil - Google Patents

Ectopic thermal desorption treatment method of polluted soil Download PDF

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CN103203355A
CN103203355A CN2013101262806A CN201310126280A CN103203355A CN 103203355 A CN103203355 A CN 103203355A CN 2013101262806 A CN2013101262806 A CN 2013101262806A CN 201310126280 A CN201310126280 A CN 201310126280A CN 103203355 A CN103203355 A CN 103203355A
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contaminated soil
burner
air
gas
soil
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CN103203355B (en
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张坚毅
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Jiangsu Ddbs Environment Remediation Co Ltd
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Jiangsu Ddbs Environment Remediation Co Ltd
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Abstract

The invention relates to an ectopic thermal desorption treatment method of polluted soil. The method comprises the steps of sieving, crushing and heaping polluted soil, wherein the thickness of mound of the polluted soil is even, and a static pressure chamber is arranged below the polluted soil; covering the polluted soil by a sealed insulating layer; providing an extracting master pipe above the coverage surface of the sealed insulating layer; providing switch valves at the parallel pipelines; adjusting part or all of the gas to two paths of discharge pipelines by the switch valves, wherein one path is an air outlet pipe accessed into an adsorption tower; one path is a tail gas reflux pipe accessed into an air inlet of a burner; the outlet of the burner is connected with a heat collecting cover; the outlet of the heat collecting cover is connected to the air inlet of a high-temperature fan and then accessed into the static pressure chamber through a secondary air pipe; the discharged gas is recycled through the burner loop; and then the valves are switched, so that the discharged partial gas enters the adsorption tower. The removal rate of volatile/semi-volatile organic matter pollution factor can be stabilized over 95%; and vapor extraction on the polluted soil also can be achieved.

Description

A kind of dystopy thermal desorption processing method of contaminated soil
Technical field
The present invention relates to a kind of dystopy thermal desorption processing method of contaminated soil.Relate in particular to volatility/semi-volatile organic matter is the soil thermal desorption processing method of pollution factor.Belong to contaminated soil reparative regeneration field.
Background technology
Along with the high speed development of industry, the organic contamination problem is outstanding gradually.Be compounded with the physicochemical property that organic pollutants can change soil in the soil in a large number, destroy local ecosystem's system, animals and plants to the zone produce indirect and direct toxic action, and by enrichment and the enlarge-effect of food chain human health is caused serious harm, and then have a strong impact on the function of use in soil.The organic pollution of soil problem has caused people's extensive concern, and soil remediation is imperative.
The present organic field ground contamination of China is mainly non-organo-chlorine pollutants such as petroleum hydrocarbon, organic agricultural chemicals pesticide, and persistence organic pollutant.
At present, from function carrier, can be divided into physics recovery technique, chemical recovery technique, bioremediation technology and compound recovery technique etc. with technical feasible non-chloro organic polluted soil recovery technique in theory.
The physics recovery technique mostly is the dystopy recovery technique, is the characteristic separately of utilizing soil and pollutant, pollutant is fixed on is difficult for diffusion and migration in the soil, or destroy pollutant and then reduce it to environment damage by modes such as high temperature.The physics recovery technique of the non-chloro organic contamination of soil mainly comprises heat treatment, isolation method and soil replacement method etc.Wherein heat treatment technics mostly is the dystopy processing, is often referred to pollution medium is transferred to specific processing unit or combustion chamber etc., is exposed to then under the high temperature, thereby destroys or remove wherein a kind of repair process of pollutant.The main advantage of dystopy recovery technique is that the processing cycle is short, and processing procedure is visual, and the continuous mixing of pollution medium and homogenizing process are easy to control, so degree for the treatment of compares homogeneous; But pollutant distribution inequality in the contaminated soil territory needs a large amount of thermal energy consumptions in the processing procedure.
Summary of the invention
The present invention seeks to: for the problem of heat treatment technics energy resource consumption height and waste in the contaminated solution soil remediation regenerative process, the invention provides a kind of dystopy thermal desorption treatment process that utilizes, especially Mo Duan tail gas partial reflux carries out again the processing method of heat energy utilization.This invention is carried out tail gas backflow adjusting according to the pollution level of contaminated soil, reduces energy resource consumption to greatest extent, can reduce the treating capacity that contains high concentration organic contaminant tail gas to greatest extent simultaneously.This invention is sieved, after the preliminary treatment such as fragmentation, with plenum chamber heat energy is evenly distributed contaminated soil, fully handles pollutant, can also carry out extracting, contaminated soil is purified reach evenly, thermal desorption processing intent completely.
Technical scheme of the present invention is: the dystopy thermal desorption processing method of contaminated soil, contaminated soil is sieved, broken, beat heap, contaminated soil mound thickness is even, contaminated soil underlying plenum chamber, the indoor particle diameter of static pressure is that the stone of 5~200mm fills up, contaminated soil and stone are isolated with net between the two, contaminated soil covers with airtight heat-insulation layer, and above airtight heat-insulation layer coverage rate, be provided with extracting and be responsible for, extracting is responsible for and is connected the extracting arm, the extracting arm connects the air inlet of adsorption tower and burner respectively by parallel pipeline, and it is switch valve that the parallel pipeline place is provided with switch valve; Switch valve adjusting part or all gas are to the two-way pipeline that picks out, one the tunnel is that discharge pipe inserts adsorption tower, one the tunnel is tail gas return duct access burner air inlet, burner outlet connects collector mat, the collector mat outlet connects high temperature resistant air inlet, high temperature resistant fan outlet connects air main, inserts plenum chamber by time airduct again; Burner, after the high temperature resistant fan starting operation, burner heats up, air after the intensification is distributed in many arms by air main, the air of heating contaminated soil enters the burner processing of burning by the tail gas return duct, air after burning is handled is distributed in many arms by air main, evenly charge in the plenum chamber again, volatility/semi-volatile organic matter in the soil is desorption and going out from soil at high temperature, and with air-flow discharge soil, discharging the gas of soil is responsible for by extracting, the extracting arm is discharged, the gas of discharging switches switch valve again through the burner circuit cycle, makes the portion gas of discharge enter adsorption tower, and the air after adsorption treatment is disposed in the atmosphere by exhaust port.
After burner 3, high temperature resistant blower fan 5 start operation, burner 3 is emitted high-temperature gas, high-temperature gas is distributed in the multichannel arm 8 by air main 6 through collector mat 4 and the mixed gas of natural air, and evenly charge in the plenum chamber 9 and heating contaminated soil 11, come out to have the gas of pollutant by extracting air pump 15 from 11 li of contaminated soils, enter burner 3 processing of burning by tail gas return duct 17, the gas after burning is handled can be according to above-mentioned path repetitive cycling.Volatility/semi-volatile organic matter in the soil is desorption and going out from soil at high temperature, and with air-flow discharge soil, switch switch valve 16 again, make the portion gas of discharge enter adsorption tower 18, the air after adsorption treatment is disposed in the atmosphere by exhaust port 19.Also can switch adjusting air-valve (setting value can be mapped with the circulation of several times or some time) again when the TOC value when a setting value is following to the gas detection that the extracting arm is discharged through burner repetitive cycling (some time) and make the portion gas of discharge enter adsorption tower, the air after adsorption treatment is disposed in the atmosphere by exhaust port.
Also can be to the online detection of gas of extracting arm 14 discharges, switching switch valve 16(setting value again when the TOC value when a setting value is following can be mapped with the circulation of several times or some time) make the portion gas of discharge enter adsorption tower 18, the air after adsorption treatment is disposed in the atmosphere by exhaust port 19.
The gas of circulation discharge is back to by tail gas return duct 17 and carries out UTILIZATION OF VESIDUAL HEAT IN in the burner 3 in addition.
The fuel of burner 3 can adopt natural gas, oil liquefied gas, product oil, straw biological coal or coal.
Further, extracting air pump 14 is installed on the extracting arm 14, when all valves 7 on closing arm 8 and unlatching extracting air pump 14, is easy to allow contaminated soil 11 be under negative pressure or the vacuum state, thereby allows some organic pollutions in soil, be evaporated.
Further, burner 3 is fixed on the movable support 2, and movable base 2 is installed on the fixed guide 1.
Further, preliminary treatment such as contaminated soil 11 sieves, fragmentation are also beaten heap, the mound cross section in echelon, trapezoidal height 1.0-3.0m, the mound plane is airtight heat-insulation layer 12 coverings of rectangle contaminated soil 11 usefulness.
Further, described switch valve 16 is continuously adjustable between A-B shown in Figure 1.Further, described plenum chamber 9 height 〉=0.3m, and be that the stone of 5~200mm fills up with particle diameter, stone and contaminated soil 11 are isolated with stainless (steel) wire 10.
Further, described stainless (steel) wire 10 holes≤20 orders arrange more than 1 layer.
The invention has the beneficial effects as follows: the inventive method and system are to volatility/semi-volatile organic matter pollution factor clearance can be stabilized in more than 95%; And by the mode of burning removal, blowdown is minimum, and minimum to the influence of environment as much as possible;
The inventive method and system are stable to the purification process of contaminated soil, homogeneous, and be not affected by environment;
The inventive method can at utmost be utilized waste heat at different pollution levels with system, the high and saving energy of efficient;
After the inventive method and system finish soil treatment, when changing the next batch contaminated soil, reduced dismounting and the installation of ajutage, saves a large amount of artificial and avoided ajutage remove and installation in possible loss;
Because plenum chamber fills with stone, be not afraid of and roll, therefore when soil being beaten heap and withdrawing, construction machinery (as digging machine etc.) can not be restricted because pre-buried pipeline is arranged; Can carry out the gas phase extracting to contaminated soil very simple and easily.The collector mat outlet connects high temperature resistant air inlet, and high temperature resistant fan outlet connects air main, inserts plenum chamber by time airduct again; The gas of discharging switches switch valve again through the burner circuit cycle, makes the portion gas of discharge enter adsorption tower.The present invention can at utmost utilize waste heat at different pollution levels.In system, switch by simple valve, can also realize the gas phase extracting to contaminated soil.
Description of drawings
Fig. 1 is dystopy thermal desorption treatment system schematic diagram
The specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in detail.
With contaminated soil 11 sieve, preliminary treatment such as fragmentation and beat heap, especially with contaminated soil 11 crushed particles particle diameter≤30mm, contaminated soil 11 after screening, fragmentation, the mummification is piled up in heaps, the mound cross section in echelon, trapezoidal height 1.0-3.0m, the mound plane is rectangle, contaminated soil arranges plenum chamber 9 11 times, plenum chamber 9 height 〉=0.2m, the indoor particle diameter of static pressure is that the stone of 5~200mm fills up, contaminated soil and stone are isolated with stainless (steel) wire (or nonwoven) 9 between the two, and stainless (steel) wire 10 holes≤20 orders preferably arrange more than 2 layers.The airtight heat-insulation layer 12 of contaminated soil 11 usefulness covers, and in the geometric center of airtight heat-insulation layer 12 coverage rates extracting is installed and is responsible for 13, extracting is responsible for 13 and is connected extracting arm 14, extracting arm 14 inserts extracting air pump 14 air inlets, switch valve 16 is installed in 14 outlets of extracting air pump, and behind switch valve 16, pick out the two-way discharge pipe, the one tunnel is that tail gas return duct 17, a road inserts adsorption tower 18.Tail gas return duct 17 inserts burner 3 entrances, burner 3 is fixed on the movable support 2, movable base 2 is installed on the fixed guide 1, burner 3 outlets connect collector mat 4, collector mat 4 outlets connect high temperature resistant blower fan 5 air inlets, high temperature resistant blower fan 5 air outlets connect air main 6, insert plenum chamber by time airduct 8 again.
Extracting air pump 14, high temperature resistant blower fan 5, burner 3 sequence startings, after system's operation, extracting arm 14 forms negative pressure, air in the contaminated soil 11 enters burner 3 by tail gas return duct 17 and heats up, air after the intensification is distributed in many arms 8 by air main 6, evenly charge in the plenum chamber 9 again, high-temperature gas is distributed into contaminated soil 11 bottoms by stainless (steel) wire 10 in the plenum chamber, volatility/semi-volatile organic matter in the soil is desorption and going out from soil at high temperature, and with air-flow discharge soil, discharge the gas of soil and be responsible for 13 by extracting, extracting arm 14 and extracting air pump 14 are discharged.Adjust switch valve 16, make the portion gas of discharge enter adsorption tower 18, air after adsorption treatment is disposed in the atmosphere by exhaust port 19, the gas of Pai Chuing is back to by tail gas return duct 17 and carries out UTILIZATION OF VESIDUAL HEAT IN in the burner 3 in addition, pollutant is fully burnt in burner 3 simultaneously, also can increase heat energy.
By the thermal desorption temperature of the soil of organic contamination generally at 80~400 ℃, the outlet temperature of burner 3 reaches as high as 1100 ℃, we can pass through the H distance that mobile movable support 2 changes between burners 3 and the collector mat 4, thereby temperature is recently regulated in the mixing that changes natural air and hot-air.Facts have proved, be best during adjustment to 300 ℃.
Only open extracting air pump 14, close valve all on the arm 87, the position of switch valve 16 is arranged on the A place, just can be so that contaminated soil be under the relative vacuum, make some organic pollutions be evaporated, so just realized the gas phase extracting.
Process burner circuit cycle is to switch through burner loop several times circulations (or some time) to regulate air-valve again, makes the part or all of gas of discharge enter adsorption tower, and the air after adsorption treatment is disposed in the atmosphere by exhaust port.
Also can switch adjusting air-valve (setting value can be mapped with the circulation of several times or some time) again when the TOC value when a setting value is following to the gas detection that the extracting arm is discharged through the burner circuit cycle and make the portion gas of discharge enter adsorption tower, the air after adsorption treatment is disposed in the atmosphere by exhaust port.
The TOC setting value can be mapped with the circulation of several times or some time.
Switch valve is in the burner circuit cycle and to enter between the adsorption tower be continuously adjustable.
Though the present invention discloses as above with preferred embodiment, so it is not in order to limit the present invention.The persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is as the criterion when looking claims person of defining.

Claims (10)

1. the dystopy thermal desorption processing method of a contaminated soil, it is characterized in that, contaminated soil is sieved, broken, beat heap, contaminated soil mound thickness is even, contaminated soil underlying plenum chamber, the indoor particle diameter of static pressure is that the stone of 5~200mm fills up, contaminated soil and stone are isolated with net between the two, contaminated soil covers with airtight heat-insulation layer, and above airtight heat-insulation layer coverage rate, be provided with extracting and be responsible for, extracting be responsible for to connect the extracting arm, and the extracting arm connects the air inlet of adsorption tower and burner respectively by parallel pipeline, and the parallel pipeline place is provided with switch valve; Switch valve adjusting part or all gas are to the two-way pipeline that picks out, one the tunnel is that discharge pipe inserts adsorption tower, one the tunnel is tail gas return duct access burner air inlet, burner outlet connects collector mat, the collector mat outlet connects high temperature resistant air inlet, high temperature resistant fan outlet connects air main, inserts plenum chamber by time airduct again; Burner, after the high temperature resistant fan starting operation, burner heats up, air after the intensification is distributed in many arms by air main, the air of heating contaminated soil enters the burner processing of burning by the tail gas return duct, air after burning is handled is distributed in many arms by air main, evenly charge in the plenum chamber again, volatility/semi-volatile organic matter in the soil is desorption and going out from soil at high temperature, and with air-flow discharge soil, discharging the gas of soil is responsible for by extracting, the extracting arm is discharged, the gas of discharging switches switch valve again through the burner circuit cycle, makes the portion gas of discharge enter adsorption tower, and the air after adsorption treatment is disposed in the atmosphere by exhaust port.
2. the dystopy thermal desorption processing method of contaminated soil according to claim 1, it is characterized in that, the gas detection of when gas of discharging passes through the burner circuit cycle extracting arm being discharged is switched switch valve when the TOC value again when a setting value is following makes the portion gas of discharge enter adsorption tower, and the air after adsorption treatment is disposed in the atmosphere by exhaust port.
3. the dystopy thermal desorption processing method of contaminated soil according to claim 2 is characterized in that, setting value can be mapped with the circulation of several times or some time, and thermal desorption temperature is at 80~400 ℃.
4. according to the dystopy thermal desorption processing method of one of claim 1-3 described contaminated soil, it is characterized in that the gas that circulation is discharged is back to by the tail gas return duct and carries out UTILIZATION OF VESIDUAL HEAT IN in the burner.
5. according to the dystopy thermal desorption processing method of one of claim 1-3 described contaminated soil, it is characterized in that burner adopts natural gas, oil liquefied gas, product oil, straw biological coal or coal.
6. according to the dystopy thermal desorption processing method of one of claim 1-3 described contaminated soil, it is characterized in that, the extracting air pump is installed on the extracting arm, when all valves on closing arm and unlatching extracting air pump, contaminated soil 11 is under negative pressure or the vacuum state, thereby organic pollution is evaporated in soil.
7. according to the dystopy thermal desorption processing method of one of claim 1-3 described contaminated soil, it is characterized in that, contaminated soil sieves, broken, beat heap, the mound cross section in echelon, the mound plane is rectangle, under the contaminated soil plenum chamber is set, isolates with stainless (steel) wire between the two, contaminated soil covers with airtight heat-insulation layer.
8. processing method according to claim 2 is characterized in that, switch valve is in the burner circuit cycle and to enter between the adsorption tower be continuously adjustable.
9. the dystopy thermal desorption processing method of contaminated soil according to claim 1, it is characterized in that, described contaminated soil territory is cut apart, resume module, with contaminated soil sieve, preliminary treatment such as fragmentation, crushed particles particle diameter≤30mm, contaminated soil after the disintegrating machine mummification is piled up in heaps, the mound cross section in echelon, trapezoidal height 1.0-3.0m, the mound plane is rectangle; Described plenum chamber height 〉=0.3m, and be that the stone of 5~200mm fills up with particle diameter, isolate with stainless (steel) wire with contaminated soil; Described stainless (steel) wire hole≤20 orders arranges more than 1 layer.
10. according to the dystopy thermal desorption treating apparatus of one of claim 1-9 described contaminated soil.
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CN103894412A (en) * 2014-03-26 2014-07-02 东南大学 Method for repairing and upgrading soil
WO2015042975A1 (en) * 2013-09-30 2015-04-02 中山大学 Soil smoldering method for remediation of heavy metal co-contaminated soil
CN105195505A (en) * 2015-10-28 2015-12-30 深圳文科园林股份有限公司 Volatile polluted soil restoration system and method thereof
CN105234163A (en) * 2015-09-09 2016-01-13 中国环境科学研究院 Simulating device for soil vapor extraction technique
CN105290096A (en) * 2015-11-06 2016-02-03 北京建工环境修复股份有限公司 In-situ smoldering system
CN106513430A (en) * 2017-01-09 2017-03-22 北京石油化工学院 Heat strengthening SVE based hydrocarbon contaminated soil remediation system
CN106807734A (en) * 2017-01-05 2017-06-09 沈阳环境科学研究院 A kind of organic polluted soil thermal desorption system
CN107685074A (en) * 2017-10-17 2018-02-13 杰瑞环保科技有限公司 soil thermal desorption processing system and processing method
CN107824608A (en) * 2017-12-13 2018-03-23 长沙汇聚环境技术有限公司 A kind of method and device of Volatile Organohalides and chromium combined contamination soil reparation
CN108480375A (en) * 2018-04-03 2018-09-04 中国环境科学研究院 Thermal desorption in situ-oxidation the repair system and restorative procedure in organic contamination place
CN108614001A (en) * 2016-12-09 2018-10-02 中国科学院大连化学物理研究所 Measure micro- pond thermal desorption device and the application of half volatile organic contaminant burst size
CN109226227A (en) * 2018-08-31 2019-01-18 中科鼎实环境工程股份有限公司 Ultraviolet light heating gas phase suitable for polycyclic aromatic hydrocarbon pollution extracts prosthetic device
CN109248910A (en) * 2018-10-31 2019-01-22 中冶焦耐(大连)工程技术有限公司 The system and method for purifying organic polluted soil is desorbed using burning hot wind in-situ heat
CN111014263A (en) * 2019-11-22 2020-04-17 光大环境修复(江苏)有限公司 System and method for ex-situ industrial remediation of contaminated soil
CN111515235A (en) * 2020-04-26 2020-08-11 中国电建集团中南勘测设计研究院有限公司 Remediation system and remediation method for chemical leaching-thermal desorption of composite contaminated soil
CN112387769A (en) * 2020-09-30 2021-02-23 南京格洛特环境工程股份有限公司 Micro negative pressure collecting and processing system for contaminated soil ex-situ remediation engineering
CN112474777A (en) * 2020-11-10 2021-03-12 湖南洞庭春米业有限公司 Pushing type repairing machine for repairing polluted soil
CN112570438A (en) * 2020-11-26 2021-03-30 山东冽泉环保工程咨询有限公司 Contaminated soil heat treatment device and method
CN114011863A (en) * 2021-10-25 2022-02-08 吴东海 Stack type thermal desorption technology

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WO2015042975A1 (en) * 2013-09-30 2015-04-02 中山大学 Soil smoldering method for remediation of heavy metal co-contaminated soil
CN103894412B (en) * 2014-03-26 2015-10-07 东南大学 A kind of soil remediation method for upgrading
CN103894412A (en) * 2014-03-26 2014-07-02 东南大学 Method for repairing and upgrading soil
CN105234163A (en) * 2015-09-09 2016-01-13 中国环境科学研究院 Simulating device for soil vapor extraction technique
CN105195505A (en) * 2015-10-28 2015-12-30 深圳文科园林股份有限公司 Volatile polluted soil restoration system and method thereof
CN105290096A (en) * 2015-11-06 2016-02-03 北京建工环境修复股份有限公司 In-situ smoldering system
CN108614001B (en) * 2016-12-09 2021-09-21 中国科学院大连化学物理研究所 Microcell thermal desorption device for determining release amount of semi-volatile organic pollutants and application
CN108614001A (en) * 2016-12-09 2018-10-02 中国科学院大连化学物理研究所 Measure micro- pond thermal desorption device and the application of half volatile organic contaminant burst size
CN106807734A (en) * 2017-01-05 2017-06-09 沈阳环境科学研究院 A kind of organic polluted soil thermal desorption system
CN106513430A (en) * 2017-01-09 2017-03-22 北京石油化工学院 Heat strengthening SVE based hydrocarbon contaminated soil remediation system
CN107685074A (en) * 2017-10-17 2018-02-13 杰瑞环保科技有限公司 soil thermal desorption processing system and processing method
CN107824608A (en) * 2017-12-13 2018-03-23 长沙汇聚环境技术有限公司 A kind of method and device of Volatile Organohalides and chromium combined contamination soil reparation
CN108480375A (en) * 2018-04-03 2018-09-04 中国环境科学研究院 Thermal desorption in situ-oxidation the repair system and restorative procedure in organic contamination place
CN109226227A (en) * 2018-08-31 2019-01-18 中科鼎实环境工程股份有限公司 Ultraviolet light heating gas phase suitable for polycyclic aromatic hydrocarbon pollution extracts prosthetic device
CN109248910A (en) * 2018-10-31 2019-01-22 中冶焦耐(大连)工程技术有限公司 The system and method for purifying organic polluted soil is desorbed using burning hot wind in-situ heat
CN111014263A (en) * 2019-11-22 2020-04-17 光大环境修复(江苏)有限公司 System and method for ex-situ industrial remediation of contaminated soil
CN111515235A (en) * 2020-04-26 2020-08-11 中国电建集团中南勘测设计研究院有限公司 Remediation system and remediation method for chemical leaching-thermal desorption of composite contaminated soil
CN112387769A (en) * 2020-09-30 2021-02-23 南京格洛特环境工程股份有限公司 Micro negative pressure collecting and processing system for contaminated soil ex-situ remediation engineering
CN112474777A (en) * 2020-11-10 2021-03-12 湖南洞庭春米业有限公司 Pushing type repairing machine for repairing polluted soil
CN112570438A (en) * 2020-11-26 2021-03-30 山东冽泉环保工程咨询有限公司 Contaminated soil heat treatment device and method
CN114011863A (en) * 2021-10-25 2022-02-08 吴东海 Stack type thermal desorption technology

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