CN104741372A - Novel thermal desorption restoring system and novel thermal desorption restoring method for treating POPs (persistent organic pollutants) polluted soil - Google Patents
Novel thermal desorption restoring system and novel thermal desorption restoring method for treating POPs (persistent organic pollutants) polluted soil Download PDFInfo
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Abstract
The invention provides a novel thermal desorption restoring method for treating POPs (persistent organic pollutants) polluted soil. The charcoal which is low in price is used for substituting active carbon to be used as a tail gas adsorption agent, the charcoal is mixed with the polluted soil to be used as a combustion heat source for supplying heat for the thermal desorption treatment on the soil, no additional external heat is needed except for the ignition of a carbide in the thermal desorption process, and the ignited soil can be spontaneously restored. In addition, in order to avoid the generation of secondary pollutants, a continuous restoring model is established, so that the adsorbed charcoal can be remixed with the polluted soil to be used as a combustion heat source for the next thermal desorption reaction so as to be recycled, and finally, a purpose for effectively, economically and environmentally restoring the POPs polluted soil can be realized. Each sample after the heat treatment is extracted by utilizing an acceleration solvent extraction method, then the sample is acidified by virtue of sulfuric acid and purified by a multilayer chromatographic column, and finally, the restoration treatment effect is verified by utilizing an analysis test means such as GC-MS (Gas Chromatography-Mass Spectrometer) combination.
Description
Technical field
The invention belongs to soil remediation field, particularly a kind of Novel hot desorption repair system and method processing contaminated soil.
Background technology
The Novel hot desorption technology of process POPs contaminated soil is optimized it on the basis of traditional thermal desorption technology, improves, and form in conjunction with sintering process exploitation.Traditional thermal desorption technology, although it is high to have remediation efficiency, course of reaction is stable and operate the advantages such as comparatively simple, but in the actual POPs contaminated soil process of process, still there is the drawback of high energy consumption, high processing cost, and secondary pollution can be produced in processing procedure, as: chlorobenzene, dioxin etc., if vent gas treatment is improper or under the saturated state of adsorbent, very easily occur that the pollutant emission exceeded standard is to the situation in air, causes serious harm to surrounding environment and health.In addition, the carbide (as: active carbon) etc. in tail gas after absorption use, due to containing a large amount of pollutants, needs again to process, can increase the cost processed further.Based on this, in order to reduce process energy consumption, cost and avoid producing secondary pollution, this technical research develops the Novel hot desorption technology as tail gas adsorption agent and combustion heat source while of utilizing charcoal.Under the reparation pattern of continuous type, first select there is stronger adsorption capacity and cheap charcoal replace active carbon as tail gas adsorption agent, be adsorbed in thermal desorption process the POPs material produced in tail gas; Secondly, the charcoal after using is mixed according to a certain percentage again with POPs contaminated soil, in the course of reaction after being allowed to condition at, serves as combustion heat source.In so avoiding the trouble that again need process charcoal, but also the heat heat supply that charcoal can be utilized to send, save processing cost.
POPs material is the class bioconcentration, refractory organics, the high toxicity can carry out the organic pollution materials of long-distance migration with air that exist in environment, produce mainly through various industrial activity and burning process, serious harm can be produced to environment and health.POPs material, once produce, first can wait along with industrial discharge activity and enter air, and can migrate to distance pollution sources place far away; Afterwards, return in ground and river by processes such as atmospheric sedimentations, be finally accumulated in soil or water body deposit.It can enter into food chain by the dispose procedure again of pollutant, and is accumulated in various animal and plant body by effects such as biological concentrations, finally enters human body.Therefore, in order to reduce the harm of POPs, the control of its contaminated soil and repair receive the extensive concern of domestic and international researcher.
Although in recent years, the continuous studied exploitation of technology of multiple reparation POPs contaminated soil, but the application technology really with practical value is also few, and consider the factors such as processing cost, processing time and energy consumption, can be used for the reparation of actual POPs contaminated site and to obtain the technology of better repairing effect very few especially.Therefore, a kind of low cost is badly in need of and the good POPs contaminated soil remediation method of repairing effect.
Summary of the invention
The object of the present invention is to provide a kind of under lower processing cost and power consumption condition, for the treatment of Novel hot desorption repair system and the method for POPs contaminated soil, to realize the reparation to POPs contaminated soil, can purification and recycling.
for solving the problems of the technologies described above, the invention provides following technical scheme:
Process a Novel hot desorption repair system for POPs contaminated soil, described Novel hot desorption repair system comprises thermal desorption treatment system and exhaust treatment system; Described thermal desorption treatment system comprises thermostat and reaction unit, and described reaction unit is positioned in thermostat; Described exhaust treatment system comprises adsorption by soil post, water collection unit, cooling end, wood charcoal adsorption post and XAD resin, is connected between each device in above exhaust treatment system by communication means; Between described thermal desorption treatment system and exhaust treatment system, connected by communication means.
Further, described Novel hot desorption repair system also comprises flowmeter and vavuum pump, and described flowmeter is connected with XAD resin by attaching parts with vavuum pump.
Further, described flow counts DC-5 dry type flowmeter, and described vavuum pump is vacuum diaphragm pump.
Further, the soil in described adsorption by soil post is POPs contaminated soil.
Further, described attaching parts are teflon hose or glass tube.
another object of the present invention is achieved through the following technical solutions:
Process a Novel hot desorption restorative procedure for POPs contaminated soil, described thermal desorption restorative procedure is realized by the Novel hot desorption repair system of above-mentioned process POPs contaminated soil, said method comprising the steps of:
(1) soil pretreatment: contaminated soil is mixed obtained soil charcoal mixture with charcoal, described mixture is laid in reaction unit;
The ratio of quality and the number of copies that described charcoal accounts for described soil charcoal mixture is 10%-30%.
(2) thermal desorption process: the reaction unit described in step (1) is placed in thermostat, opens thermostat temperature switch, and the carbon block through preheating is placed in reaction unit, realize the spontaneous combustion of soil charcoal mixture, open vavuum pump simultaneously;
(3) vent gas treatment: after vavuum pump is opened, the tail gas produced in thermal desorption processing procedure is drawn by reaction unit bottom, enter exhaust treatment system, successively through adsorption by soil post, water collection unit, cooling end, wood charcoal adsorption post and XAD resin, realize vent gas treatment, described wood charcoal adsorption post obtains secondary charcoal after tail gas passes through;
(4) when soil charcoal mixture temperature is reduced to less than 500 DEG C, vavuum pump is closed; When soil charcoal mixture temperature is reduced to 40 DEG C, close described thermostat temperature switch, namely obtain the soil after processing;
(5) the secondary charcoal reusable edible described in step (3), is mixed to get soil charcoal mixture by described secondary charcoal and contaminated soil, can realize the reparation of contaminated soil successively according to above-mentioned steps (1)-(4).
Further, first evenly tile one deck sand grains on step (1) described reaction unit surface, then be laid on described sand grains by described soil charcoal mixture.
Further, step (1) described reaction unit is fixed in thermostat, according to the height of soil charcoal mixture in reaction unit, by the induction tube equidistantly inserting thermocouple, measures the variations in temperature of different sample layer.
Further, the charcoal described in step (1) is through drying and processing, and the condition of described drying and processing is 85 DEG C-95 DEG C, 3-5h.
Further, the particle diameter of described charcoal is less than 2mm.
Further, the preheating of the described carbon block of step (2) realizes at Muffle furnace, and the temperature of Muffle furnace is set in 600 DEG C.
Further, the pollutant of described POPs contaminated soil comprises OCPs, PCBs or PCDD/Fs and several mixtures.Described contaminated soil has four kinds, i.e. Beijing moisture soil, Heilungkiang black earth, Red Soils in Hunan Province and Beijing sand.
the Novel hot desorption technology beneficial effect compared to existing technology of reparation POPs contaminated soil of the present invention is:
1, this method charcoal replaces active carbon, compared with active carbon, the price of charcoal can reduce a lot, be only 1/10th of active carbon, there are some researches show that the adsorption capacity of charcoal is the requirement that can reach organic matter tail gas adsorption, by contrast, charcoal is used to have higher economic benefit for tail gas adsorption agent;
2, the present invention mixes charcoal as combustion heat source with contaminated soil, and course of reaction only needs ignition source to ignite can spontaneously to carry out, and do not need the extraneous heat supply continued, this, by having saved a large amount of energy, reduces energy consumption;
In the Novel hot desorption restorative procedure of 3, POPs contaminated soil of the present invention, the charcoal of tail gas adsorption agent reuses, mix with contaminated soil as combustion heat source, improve the utilization ratio of raw material, save cost, turn avoid the complex process of tail gas adsorption agent being carried out to after-treatment, thus simplify repair process process.
Accompanying drawing explanation
Fig. 1 is Novel hot desorption treatment system schematic diagram of the present invention;
Fig. 2 continuous type repairs ideograph.
Detailed description of the invention
In order to introduce the present invention further, below the detailed step of its experimentation and example are introduced.According to Convention of Stockholm, POPs material can be divided into three major types material, that is: pesticide (lindane, hexachloro-benzene etc.), industrial products class (Polychlorinated biphenyls) and dioxin (dioxin).Now from three major types, select one respectively, as the research object material of embodiment.
embodiment 1
Process a Novel hot desorption repair system for POPs contaminated soil, described Novel hot desorption repair system comprises thermal desorption treatment system and exhaust treatment system; Described thermal desorption treatment system comprises thermostat and reaction unit, and described reaction unit is positioned in thermostat; Described exhaust treatment system comprises adsorption by soil post, water collection unit, cooling end, wood charcoal adsorption post and XAD resin, is connected between each device in above exhaust treatment system by communication means; Between described thermal desorption treatment system and exhaust treatment system, connected by communication means.Further, described attaching parts are teflon hose or glass tube.
XAD resin is a kind of aromatic polymer (also referred to as: macroporous absorbent resin or full porous resin), is widely used in hydrophobic compound; Phenol, organic matter are separated; Surfactant; Arene compound; Catalyst; Metal; Antibiotic extraction etc.
Further, described Novel hot desorption repair system also comprises flowmeter and vavuum pump, and described flowmeter is connected with XAD resin by attaching parts with vavuum pump.
Further, described flow counts DC-5 dry type flowmeter, and described vavuum pump is vacuum diaphragm pump.
Further, the soil in described adsorption by soil post is POPs contaminated soil.
Process a Novel hot desorption restorative procedure for POPs contaminated soil, described thermal desorption restorative procedure is realized by the Novel hot desorption repair system of above-mentioned process POPs contaminated soil, said method comprising the steps of:
(1) soil pretreatment: contaminated soil is mixed obtained soil charcoal mixture with charcoal, described mixture is laid in reaction unit; The ratio of quality and the number of copies that described charcoal accounts for described soil charcoal mixture is 10%-30%;
(2) thermal desorption process: the reaction unit described in step (1) is placed in thermostat, opens thermostat temperature switch, and the carbon block through preheating is placed in reaction unit, realize the spontaneous combustion of soil charcoal mixture, open vavuum pump simultaneously;
(3) vent gas treatment: after vavuum pump is opened, the tail gas produced in thermal desorption processing procedure is drawn by reaction unit bottom, enter exhaust treatment system, successively through adsorption by soil post, water collection unit, cooling end, wood charcoal adsorption post and XAD resin, realize vent gas treatment, described wood charcoal adsorption post obtains secondary charcoal after tail gas passes through;
(4) when soil charcoal mixture temperature is reduced to less than 500 DEG C, vavuum pump is closed; When soil charcoal mixture temperature is reduced to 40 DEG C, close described thermostat temperature switch, namely obtain the soil after processing;
(5) the secondary charcoal reusable edible described in step (3), is mixed to get soil charcoal mixture by described secondary charcoal and contaminated soil, can realize the reparation of contaminated soil successively according to above-mentioned steps (1)-(4).
Further, first evenly tile one deck sand grains on step (1) described reaction unit surface, then be laid on described sand grains by described soil charcoal mixture.
Further, step (1) described reaction unit is fixed in thermostat, according to the height of soil charcoal mixture in reaction unit, by the induction tube equidistantly inserting thermocouple, measures the variations in temperature of different sample layer.
Further, the charcoal described in step (1) is through drying and processing, and the condition of described drying and processing is 85 DEG C-95 DEG C, 3-5h.
Further, the particle diameter of described charcoal is less than 2mm.
Further, the preheating of the described carbon block of step (2) realizes at Muffle furnace, and the temperature of Muffle furnace is set in 600 DEG C.
embodiment 2
The present embodiment is the preferred version on embodiment 1 basis, and the Novel hot desorption reparation of described process POPs contaminated soil comprises the following steps:
1, Novel hot desorption processing procedure
(1) take 50g sand grains respectively, 25g charcoal and 75g soil (charcoal accounts for 25%) also mix charcoal with soil, obtain soil charcoal mixture;
(2) sand grains is transferred to reaction tube, pave, and measure with a yardstick and get reaction tube upper end to the distance of sand grains and record;
(3) the soil charcoal mixture mixed is poured in reaction tube, pave, and measure the distance of upper end, record;
(4) after loading good described soil charcoal mixture, reaction tube is fixed in insulating box, according to the height of sample in reaction tube, by the induction tube equidistantly inserting thermocouple, measures the variations in temperature of different sample layer;
(5) calorstat temperature switch and thermocouple switch is opened;
(6) the carbon block burnt in Muffle furnace (whole carbon block is rubescent) is transferred in reaction tube with crucible tongs, open vavuum pump, heat treatment experiment starts simultaneously;
(7) each edaphic temperature drops to less than 500 DEG C, closes vavuum pump; When temperature drops to about 40 DEG C, close insulating box power supply, store heat galvanic couple data also close thermocouple, namely obtain the soil after thermal desorption process.
2, sample pre-treatments
Soil after described thermal desorption process is sampled respectively, adds a certain amount of diatomite, then carry out accelerated solvent extraction, acidifying, multilayer chromatographic column purification, rotary evaporation and nitrogen successively and blow, specific experiment condition is as follows:
(1) accelerated solvent extraction
Extractant is n-hexane and carrene (volume ratio is 1:1); Extraction conditions: 100 DEG C, heats 5min under 10.34MPa, static extracting 5min, and flush volume is 100%, and nitrogen purge time is 60s, circulates 3 times, gets extract to be measured.
(2) sulfuric acid acidation
Solution after accelerated solvent extraction is transferred in separatory funnel, adds the appropriate concentrated sulfuric acid, concussion, leaves standstill, and releases the liquid of lower floor, so operation N time, until upper solution is water white transparency.
(3) multilayer chromatographic column purification
The preparation method of multilayer chromatographic post: be followed successively by 1g silica gel from the bottom up, 4g alkaline silica gel, 1g silica gel, 8g acidic silica gel, 2g silica gel, 4g anhydrous sodium sulfate.
(4) rotary evaporation
Solution after acidifying is transferred in flask, on a rotary evaporator rotary evaporation, until the solution in flask remains 5ml, stop evaporation.
(5) nitrogen blows
Moved in KD bottle by solution after rotary evaporation, on Nitrogen evaporator, nitrogen blows, until solution reduces to 1ml, and shut-down operation.
3, GC-MS analyzes and measures
Experimental analysis adopts Agilent 7890A, the capillary column used is DB-5MS, 15m × 0.25mm × 0.1 μm low-bleed fused-silica capillary column, carrier gas is high pure nitrogen, use miniature electronic trapping detector (μ ECD) to collect chromatographic data, and use MS to carry out qualitative analysis to each pollutant.
Chromatographic condition: injector temperature is 290 DEG C, initial temperature 80 DEG C, keeps 0.75min; Be raised to 240 DEG C, keep 3min, heating rate is 10 DEG C/min; Be raised to 290 DEG C again, keep 12min, heating rate is 20 DEG C/min.
The solution that KD-concentrates in bottle is transferred in sample injection bottle, and upper machine analysis measures.
embodiment 3
The present embodiment is the preferred version on embodiment 1 and 2 basis, and the present embodiment is the Novel hot desorption process for organo-chlorine pesticide (OCPs) contaminated soil, and before process, the concentration of organo-chlorine pesticide (OCPs) contaminated soil is: 16 mg kg
-1, the component comprised mainly comprises: hexachloro-benzene (HCB), DDT (DDT) and BHC (HCHs).
Described thermal desorption restorative procedure is with reference to embodiment 2.
(1) treatment effeciency
After thermal desorption process, in soil, the residual quantity of OCPs is only: 0.25-0.46 mg kg
-1, degradation rate can reach more than 97%.
(2) content of pollutant in tail gas
After thermal desorption process, in tail gas, the concentration of OCPs is 0.02-0.06 mg Nm
-3scope in, the organic pollution larger without toxicity such as dioxin is detected.
embodiment 4
The present embodiment is the preferred version on embodiment 1 and 2 basis, and the present embodiment is the Novel hot desorption process for Polychlorinated biphenyls (PCBs) contaminated soil, and described thermal desorption restorative procedure is with reference to embodiment 2.
(1) treatment effeciency
Before and after thermal desorption process, the clearance of PCBs and degradation rate can be calculated by the formula of two below:
Clearance RE
pCBs(%)=(in soil, the initial concentration-PCBs of PCBs processes concentration in rear soil) PCBs initial concentration in ÷ soil
Degradation rate DEPCBs(%) PCBs initial concentration in=(in soil PCBs initial concentration-PCBs process after concentration in concentration-PCBs wood charcoal adsorption post concentration-PCBs cooling end concentration-PCBs tail gas in soil) ÷ soil
By can be calculated, utilizing Novel hot desorption treatment technology to repair in the process of different PCBs contaminated soil, the clearance of PCBs all can reach more than 99%, and the initial concentration of PCBs contaminated soil can not affect its clearance; And PCBs degradation rate is more than 70%, its degradation rate can improve along with the increase of PCBs pollution concentration, and when process initial concentration is 90mg kg-1PCBs contaminated soil, its degradation rate can reach more than 85%.
(2) after process, in soil, the structure of PCBs forms
Before thermal desorption process, the structure of PCBs contaminated soil consists of: the component that 4 chloro PCBs account for is maximum, and reaching more than 60%, is secondly 3 chloro PCBs, 5 chloro PCBs and 6 chloro PCBs, and high chloro PCBs(6-10) shared by proportion little, only have 2.2%.But after thermal desorption process, the structure composition of PCBs there occurs obvious change.Main manifestations is: the PCBs component of low chloro increases, and the PCBs component of high chloro does not then detect.According to can be calculated, 1-4 chloro PCBs accounts for more than 95% of total PCBs residual quantity.This shows: in the middle of thermal desorption process, and PCBs mainly there occurs dechlorination and degradation reaction.
(3) content of pollutant in tail gas
After thermal desorption process, the PCBs total amount in PCBs contaminated soil tail gas is 0.012-0.019 mg Nm
-3, far below in the world to PCBs exhaust standard limit value, and only have low chloro PCBs(to be less than 6 chloros) be detected in tail gas.In addition, because PCBs is the precursor of dioxin material, can occur under certain condition transform and produce the larger PCDD/Fs material of toxicity.Therefore, have detected the PCDD/Fs content in tail gas under study for action equally.Result shows, its concentration value is 0.19-0.25 ng Nm
-3, being converted to toxic equivalent concentration is: 0.00047-0.00081ng-TEQ Nm
-3, meet in the world to emission request (the 0.1 ng-TEQ Nm of dioxin material
-3).This mainly because the treatment temperature higher (higher than 600 degrees Celsius) of this Novel hot desorption technology, and is provided with exhaust temperature cooling end at vent gas treatment end, inhibits the generation again of dioxin material preferably.
embodiment 5
The present embodiment is the preferred version on embodiment 1 and 2 basis, and the present embodiment is the Novel hot desorption process for dioxin contamination soil, and described thermal desorption restorative procedure is with reference to embodiment 2.
(1) treatment effeciency
As shown in table 1, before thermal desorption process, total amount concentration and the toxic equivalent concentration of dioxin Substance P CDD/Fs are respectively: 500,000 ng g
-1with 1340 ng-TEQ g
-1, 1000 pg-TEQ g of dioxin contamination soil in environment
-1.But after the treatment, in soil, the concentration of PCDD/Fs is down to 66-1770 pg g
-1, corresponding toxic equivalent concentration is also reduced to 0.0078-23 pg-TEQ g
-1, far below the toxic equivalent concentration limit of dioxin soil in environment.By can be calculated, the removal efficiency of PCDD/Fs all can reach more than 99%.Some experiment conditions, as: the change of air velocity can have an impact to the removal efficiency of dioxin, but all meets the concentration requirement after process.
PCDD/Fs concentration before and after table 1 processes in soil and removal efficiency
(2) after process, in soil, the structure of dioxin forms
Before thermal desorption process, the content of PCDDs is higher than PCDFs, and its ratio is 1.9.As shown in Table 1, the PCDD/Fs of high chloro, as: HpCDD, HpCDF of 8 chloro OCDD, OCDF, 7 chloros account for larger proportion in the structure composition of dioxin.Then, after thermal desorption process, there is not significantly change in the structure composition of 4-8 chloro PCDD/Fs, still presents the trend reduced gradually to low chloro PCDD/Fs concentration from high chloro.This shows: in whole repair process, and dioxin material is mainly based on degradation reaction, and dechlorination reaction does not play very important effect.In addition, the degradation efficiency of PCDDs is higher than PCDFs, and this may with dioxin contamination soil, and the initial concentration of PCDDs is relevant far above PCDFs.
(3) content of pollutant in tail gas
After thermal desorption process, in tail gas, the concentration range of PCDD/Fs is between 0.087-0.67 pg-TEQ Nm-3, all meets dioxin mass emissions standard (100 pg-TEQ Nm-3) general in the world.
It is to be understood that foregoing invention content and detailed description of the invention are intended to the practical application proving technical scheme provided by the present invention, should not be construed as limiting the scope of the present invention.Those skilled in the art in spirit of the present invention and principle, when doing various amendment, equivalent replace or improve.Protection scope of the present invention is as the criterion with appended claims.
Claims (10)
1. process a Novel hot desorption repair system for POPs contaminated soil, it is characterized in that, described Novel hot desorption repair system comprises thermal desorption treatment system and exhaust treatment system; Described thermal desorption treatment system comprises thermostat and reaction unit, and described reaction unit is positioned in thermostat; Described exhaust treatment system comprises adsorption by soil post, water collection unit, cooling end, wood charcoal adsorption post and XAD resin, is connected between each device in above exhaust treatment system by communication means; Between described thermal desorption treatment system and exhaust treatment system, connected by communication means.
2. the Novel hot desorption repair system of process POPs contaminated soil according to claim 1, it is characterized in that, described Novel hot desorption repair system also comprises flowmeter and vavuum pump, and described flowmeter is connected with XAD resin by attaching parts with vavuum pump.
3. the Novel hot desorption repair system of process POPs contaminated soil according to claim 2, it is characterized in that, described flow counts DC-5 dry type flowmeter, and described vavuum pump is vacuum diaphragm pump.
4. the Novel hot desorption repair system of process POPs contaminated soil according to claim 1, it is characterized in that, the soil in described adsorption by soil post is POPs contaminated soil.
5. process a Novel hot desorption restorative procedure for POPs contaminated soil, it is characterized in that, described thermal desorption restorative procedure is realized by the Novel hot desorption repair system of the process POPs contaminated soil described in claim 1-4, said method comprising the steps of:
(1) soil pretreatment: contaminated soil is mixed obtained soil charcoal mixture with charcoal, described mixture is laid in reaction unit;
(2) thermal desorption process: the reaction unit described in step (1) is placed in thermostat, opens thermostat temperature switch, and the carbon block through preheating is placed in reaction unit, realize the spontaneous combustion of soil charcoal mixture, open vavuum pump simultaneously;
(3) vent gas treatment: after vavuum pump is opened, the tail gas produced in thermal desorption processing procedure is drawn by reaction unit bottom, enter exhaust treatment system, successively through adsorption by soil post, water collection unit, cooling end, wood charcoal adsorption post and XAD resin, realize vent gas treatment, described wood charcoal adsorption post obtains secondary charcoal after tail gas passes through;
(4) when soil charcoal mixture temperature is reduced to less than 500 DEG C, vavuum pump is closed; When soil charcoal mixture temperature is reduced to 40 DEG C, close described thermostat temperature switch, namely obtain the soil after processing;
(5) the secondary charcoal reusable edible described in step (3), is mixed to get soil charcoal mixture by described secondary charcoal and contaminated soil, can realize the reparation of contaminated soil successively according to above-mentioned steps (1)-(4).
6. the Novel hot desorption restorative procedure of process POPs contaminated soil according to claim 5, is characterized in that, first evenly tile one deck sand grains on step (1) described reaction unit surface, then be laid on described sand grains by described soil charcoal mixture.
7. the Novel hot desorption restorative procedure of process POPs contaminated soil according to claim 6, it is characterized in that, step (1) described reaction unit is fixed in thermostat, according to the height of soil charcoal mixture in reaction unit, by the induction tube equidistantly inserting thermocouple, measure the variations in temperature of different sample layer.
8. the Novel hot desorption restorative procedure of the process POPs contaminated soil according to any one of claim 5-7, is characterized in that, the charcoal described in step (1) is through drying and processing, and the condition of described drying and processing is 85 DEG C-95 DEG C, 3-5h.
9. the Novel hot desorption restorative procedure of process POPs contaminated soil according to claim 5, it is characterized in that, the particle diameter of described charcoal is less than 2mm.
10. the Novel hot desorption restorative procedure of process POPs contaminated soil according to claim 5, it is characterized in that, the pollutant of described POPs contaminated soil comprises OCPs, PCBs or PCDD/Fs.
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| CN106694538A (en) * | 2017-01-04 | 2017-05-24 | 浙江博世华环保科技有限公司 | System and method for repairing organic contaminated soil through sludge microwave gasification residues in targeting mode |
| CN106694538B (en) * | 2017-01-04 | 2022-08-30 | 浙江博世华环保科技有限公司 | System and method for targeted remediation of organic contaminated soil by sludge microwave gasification residues |
| CN108500046A (en) * | 2018-05-09 | 2018-09-07 | 中国联合工程有限公司 | Contaminated soil thermal desorption device and its method for reducing dioxin generation |
| CN113426819A (en) * | 2021-07-02 | 2021-09-24 | 昆明理工大学 | Method for in-situ pyrolysis of copper tailings by biomass |
| CN114789192A (en) * | 2022-03-23 | 2022-07-26 | 无锡市政设计研究院有限公司 | Method for remediating petroleum hydrocarbon contaminated soil |
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