CN108114970A - A kind of contaminated soil original position thermal desorption repair system and method - Google Patents
A kind of contaminated soil original position thermal desorption repair system and method Download PDFInfo
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- CN108114970A CN108114970A CN201711395608.9A CN201711395608A CN108114970A CN 108114970 A CN108114970 A CN 108114970A CN 201711395608 A CN201711395608 A CN 201711395608A CN 108114970 A CN108114970 A CN 108114970A
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- 238000003795 desorption Methods 0.000 title claims abstract description 41
- 230000008439 repair process Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000011065 in-situ storage Methods 0.000 claims abstract description 61
- 238000010438 heat treatment Methods 0.000 claims abstract description 59
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 47
- 231100000719 pollutant Toxicity 0.000 claims abstract description 47
- 238000000605 extraction Methods 0.000 claims abstract description 35
- 239000007924 injection Substances 0.000 claims abstract description 33
- 238000002347 injection Methods 0.000 claims abstract description 33
- 238000012544 monitoring process Methods 0.000 claims abstract description 28
- 239000010865 sewage Substances 0.000 claims abstract description 15
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 14
- 238000002386 leaching Methods 0.000 claims abstract description 14
- 239000003673 groundwater Substances 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 41
- 239000007789 gas Substances 0.000 claims description 29
- 238000012545 processing Methods 0.000 claims description 13
- 230000004888 barrier function Effects 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 239000004094 surface-active agent Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 238000005067 remediation Methods 0.000 claims description 6
- 239000000284 extract Substances 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 5
- 239000002680 soil gas Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
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- 229910002804 graphite Inorganic materials 0.000 claims description 3
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- 239000011435 rock Substances 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 239000011229 interlayer Substances 0.000 claims 1
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- 238000001179 sorption measurement Methods 0.000 abstract description 3
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- 238000005516 engineering process Methods 0.000 description 18
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- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
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- 239000001630 malic acid Substances 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000001397 quillaja saponaria molina bark Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- FCBUKWWQSZQDDI-UHFFFAOYSA-N rhamnolipid Chemical compound CCCCCCCC(CC(O)=O)OC(=O)CC(CCCCCCC)OC1OC(C)C(O)C(O)C1OC1C(O)C(O)C(O)C(C)O1 FCBUKWWQSZQDDI-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/005—Extraction of vapours or gases using vacuum or venting
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
Abstract
The present invention relates to a kind of contaminated soil original position thermal desorption repair system and method, system includes several In Situ Heating electrodes, several injection wells, several extraction wells, several groundwater monitoring wells, electrode electrical and controls to adjust facility, in-situ temperature pressure monitoring facility, sewage treatment facility and exhaust-gas treatment facilities；The extraction well is equipped with extraction device, the extraction device connection sewage treatment facility and exhaust-gas treatment facilities；It is described to inject into well equipped with injection device, the material storing box of the injection device connection equipped with leaching reagent；The In Situ Heating electrode is arranged using equilateral triangle or regular hexagon mode.Compared with prior art, after present invention addition leaching reagent dissolves pollutant, pollutant solubility is increased, increase pollutant mutually enters the speed of liquid phase, the raising of realization pollutants removal rate and removal efficiency from adsorption by soil.
Description
Technical field
The present invention relates to technical field of soil remediation, more particularly, to a kind of contaminated soil original position thermal desorption repair system and
Method.
Background technology
Thermal desorption technology in situ is an important technology in contaminated soil based technique for in-situ remediation, and cardinal principle is in original
Position contaminated soil is heated to more than the boiling point of target contaminant, promote pollutant gasification volatilization so that target contaminant with
Soil particle separation, removal.Thermal desorption process can make the physicochemical changes such as organic compound volatilization and the cracking in soil.
After pollutant is converted into gaseous state, mobility will greatly improve, after the gaseous products evaporated are by collection and capture
Carry out purified treatment.
Thermal desorption technology in situ is particularly suitable for the soil region of heavily contaminated, including high concentration, nonaqueous phase, it is free and
The organic pollution in source.At present, thermal desorption technology in situ can be used for the pollutant of processing to be mainly chlorinated organics
(CVOCs), semi-volatile organic matter (SVOCs), petroleum hydrocarbon (TPH), polycyclic aromatic hydrocarbon (PAHs), Polychlorinated biphenyls (PCBs) and
Pesticide etc..
The mode of heating of thermal desorption technology in situ mainly has：Resistance-type heating, steam hot-air directly heats and heat transfer
Heating.At present in the reparation of organic contamination industrial sites, the application of thermal desorption technology in situ gradually increases, but in the market may be used
With technology all there are high energy consumption, rehabilitation cost is high the shortcomings that.
Resistance thermal desorption technology (ERH) is centered on a core electrode, around establishes one group of electrode array, so all
Electrode forms electric current with core electrode.Since soil is natural conductor, heat is generated by electric resistance of soil, is carried out at thermal desorption
Reason.General resistance thermal desorption technology can make the soil moisture higher than 100 DEG C, then by the extractor on ground by the gas of generation
State pollutant exports.
Thermally conductive heat desorption technology (TCH) is covered in soil table with stainless steel heated well or electrical heating cloth in the soil
Face, so that volatilization and cracking reaction occur for the pollutant in soil.General stainless steel heated well pollutes for deep subsoil
It repairs, and electrical heating cloth is administered for pollution of surface.Under normal circumstances, can be furnished with carrier gas or carry out gas phase extracting, to volatilization
Moisture and pollutant be collected and handle.
Steam thermal desorption technology (SEE) not only can reduce organic matter viscosity in soil and groundwater, accelerate volatilization, release
Organic pollutants are placed with, and hot steam can make some pollutant structures that the chemical reactions such as fracture occur.Under normal circumstances, heat is steamed
Vapour is sprayed from injector well, radial extension.In soil saturation area, steam makes pollutant be shifted into underground water, so as to
It is recycled by the extracting to underground water and then pollutant；Then it is by the gas phase to gaseous volatile and in ventilation zone
Extracting carries out pollutant recovery processing.
Hot-air thermal desorption technology is that hot-air is passed through in the soil water, by heating soil pollutant is made to volatilize.In depth
In the layer soil remediation stage, the heat air pressure often used is higher, and there are certain technical risks.
Hot water is injected into soil and groundwater by hot water thermal desorption technology using injector well, strengthens wherein organic contamination
Vaporization reduces nonaqueous phase and the organic pollution viscosity of high concentration, makes its mobility more preferable, is returned so as to more preferably carry out pollutant
It receives.
High frequency thermal desorption technology is that soil is heated using electromagnetic energy, and this method can pass through different vertical of insertion
The soil region that electrode pair is disperseed is heated respectively.The soil generally heated is by two rows of electrodes surroundings, and energy is in
Between the 3rd row's electrode provide, entire three rows electrode is similar to a three-phase electricity volume.Once energy supply, entire electrode are opened from top to bottom
Beginning heats soil media, and the soil moisture can reach 300 DEG C or more under normal circumstances.
Traditional resistance-type mode of heating heating effect is unevenly distributed, and due to the limitation of temperature, it is higher to boiling point
Semi-volatile organic matter removal effect is bad, longer so as to cause partial result is poor, energy consumption consumes higher and repair time.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of contaminated soil is in situ
Thermal desorption repair system and method.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of contaminated soil original position thermal desorption repair system, if including lay several In Situ Heating electrodes in the soil,
Dry injection well, several extraction wells, several groundwater monitoring wells and electrode electrical control and regulation facility, the in-situ temperature being located on the ground
Pressure monitoring facility, sewage treatment facility and exhaust-gas treatment facilities；The extraction well is equipped with extraction device, and the extraction device connects
Connect sewage treatment facility and exhaust-gas treatment facilities；Described to inject into well equipped with injection device, the injection device connection is equipped with leaching
The material storing box of molten reagent；The In Situ Heating electrode connection electrode Electric control adjusts facility, using equilateral triangle or positive six
Side shape mode is arranged.
Preferably, the laying spacing of the In Situ Heating electrode is 3~8m.
Preferably, the depth of placement of the In Situ Heating electrode extends to 0.4~1.5m below processing target, and extends
To 0.4~2m of processing targeted peripheral.
Preferably, the in-situ temperature pressure monitoring facility includes several temperature monitoring nodes and several pressure monitoring sections
Point, the temperature monitoring node are used to monitor the cold spot position of In Situ Heating surrounding them environment and In Situ Heating heated by electrodes scope
The temperature put, the pressure monitoring node are arranged on the most deep degree of electrode buried depth.
Preferably, the injection well is identical with the number of extraction well, the number ratio of the injection well and In Situ Heating electrode
For 1：3 to 1：6.
Preferably, covering barrier layer is further included, is located above Polluted area.
Preferably, the covering barrier layer is light-weight foamed cement cap rock.
Preferably, filler particles graphite and it is compacted in the drilling where the In Situ Heating electrode, it is ensured that tight
Closely connected tight In Situ Heating electrode surface；In Situ Heating electrode both ends are equipped with the water filling port of connection and are connected with water circulation system, use
The local water shortage in soil remediation region is caused in the heating of supplement In Situ Heating electrode tip position.
A kind of contaminated soil original position thermal desorption restorative procedure, comprises the following steps：
S1, leaching reagent is injected by injection well in area to be repaired；
S2, thermal desorption is carried out to pollutant by being arranged in the In Situ Heating electrod-array of area to be repaired；
S3, by multiphase or gas phase method for extracting, will be dissolved in the underground water of area to be repaired or be present in soil gas
In pollutant extract former contaminated site, and carry out the processing of sewage and exhaust gas on ground；
S4, it is reduced to when the pollution concentration for detecting the gas in the liquid or exhaust-gas treatment facilities in sewage treatment facility
The setting ratio of maximum possible pollution concentration and continue set duration when, to contaminated soil sample, if reaching reparation desired value,
Stop repairing, high-temperature steam, surfactant or air are otherwise injected by injection well and improve shifting of the pollutant in Polluted area
Dynamic property, and continue repair process.
Preferably, the step S1 is specifically included：
In area to be repaired, leaching reagent is injected by injector well using intermittently or serially mode, then by injecting into well
The gap of well screen is entered in contaminated soil and underground water, and the injection well is arranged in the range of the extraction well radius of influence or is arranged on
The position of subsurface flow upstream where extraction well.
Compared with prior art, the present invention has the following advantages：
1st, after addition leaching reagent dissolves pollutant, increase pollutant solubility, increase pollutant from adsorption by soil phase
Into the speed of liquid phase, the raising of pollutants removal rate and removal efficiency is realized.
2nd, in the case of in contaminated site there are nonaqueous phase liquid (NAPL), the azeotropic machine between pollutant and water is utilized
Reason reduces pollutant boiling point to a certain extent, increases pollutant solubility, improves the ratio that pollutant volatilizees under relatively lower temp
Example, increase pollutant enter the speed of liquid and gas from adsorption by soil phase, NAPL phases, realize pollutants removal rate and removal
The raising of efficiency.
3rd, Polluted area soil and underground can be evenly heated using equilateral triangle or regular hexagon mode electrode of arranging
Water, overcomes and non-uniform shortcoming is heated in traditional resistor heating means, and efficiency of heating surface higher is more energy saving, does not have dead angle, profit
By the use of underground water as main conductive medium, promote electric current from area to be repaired uniformly across.
4th, expand thermal desorption technology in situ and be applicable in territorial scope, the plentiful region of underground water is expanded to from underground anhydrous domains,
Compared with the thermal desorption technology of other types original position, underground water barrier engineering cost in situ is reduced, reduction needs heat removal and repair
In the range of remaining underground water additional energy and expense.
5th, with 100 DEG C or so low-temperature heats, hot-fixing energy consumption in situ is reduced, reduces rehabilitation cost.
6th, by injecting different media, such as steam, surfactant, it can not only realize that volatility is stronger organic
The soil pollution reparation of pollutant, fuel oil, can be also used for process part half volatile organic contaminant.
Description of the drawings
Fig. 1 is the structure diagram of present invention thermal desorption repair system in situ；
Fig. 2 is the arrangement schematic diagram of injection well, In Situ Heating electrode and extraction well in the embodiment of the present invention；
Fig. 3 is extraction device structure diagram in the present invention；
Fig. 4 is In Situ Heating electrode structure schematic diagram in the present invention.
It is marked in figure：1st, In Situ Heating electrode, 2, injection well, 3, extraction well, 4, gas phase extraction device, 5, covering barrier
Layer, 6, valve, 31, vacuum meter, 32, immersible pump electric wire, 33, liquid extraction pipe, 34, cement mortar, 35, PVC casings, 36, swollen
Profit soil, 37, cable, 38, quartz sand, 39, immersible pump, 41, top water filling port, 42, upper guard-plate, 43, middle part slot, 44,
Water filling hose, 45, bottom baffle, 46, bottom water injection mouth.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
Embodiment
As shown in Figure 1, a kind of contaminated soil original position thermal desorption repair system, including laying several add in-place in the soil
Thermode, several injection wells, several extraction wells, several groundwater monitoring wells and be located on the ground electrode electrical control and regulation set
It applies, in-situ temperature pressure monitoring facility, sewage treatment facility and exhaust-gas treatment facilities；Extraction well is equipped with extraction device, extracting dress
Put connection sewage treatment facility and exhaust-gas treatment facilities；Inject into well equipped with injection device, injection device connection is tried equipped with leaching
The material storing box of agent；In Situ Heating electrode connection electrode Electric control adjusts facility, using equilateral triangle or regular hexagon mode
Arrangement.
Repair system further includes covering barrier layer, is located above Polluted area, and in the present embodiment, covering barrier layer is foam
Light cement cap rock.
In Situ Heating electrode is typically steel pipe or copper coin, and controlling to adjust facility by electrode electrical controls.Where electrode
It filler particles graphite and is compacted in drilling, it is ensured that be closely adjacent to In Situ Heating electrode surface；In Situ Heating electrode two
Water filling port of the end equipped with connection is simultaneously connected with water circulation system, and soil is caused for supplementing the heating of In Situ Heating electrode tip position
The local water shortage of restoring area, as shown in figure 4, rate of water injection scope is 0.2~2L/min.
In Situ Heating electrode is arranged using equilateral triangle or regular hexagon mode, is sent out by the electrode of different arrangement combinations
Alternating current is penetrated, soil and groundwater to be repaired generates heat as conducting medium by soil particle resistance using between Different electrodes
Amount carries out thermal desorption to pollutant.The laying spacing of In Situ Heating electrode is 3~8m, according to soil condition in the project implementation
Decision is adjusted with pollutant situation, and in the present embodiment, laying spacing is 6m, is arranged using equilateral triangle mode, such as Fig. 2 institutes
Show.The depth of placement of In Situ Heating electrode extends to 0.4~1.5m below processing target, and extends to processing target periphery
0.4~2m, to ensure that entire area to be repaired can uniformly reach required temperature.Electrode specifically lays distance and lays scope
Depending on pollutant characteristic, the required rate of heat addition, expected heat loss, the construction and installation mode of electrode and required final
Temperature.
Extraction well can use multiphase extraction well or gas phase extraction well according to place situation.
Injection well is identical with the number of extraction well, and the number ratio of injection well and In Situ Heating electrode is 1：3 to 1：6, according to
Place concrete condition design.In the present embodiment, it is preferred that injection well, In Situ Heating electrode, extraction well are with 1：3：1 ratio cloth
It puts.
In-situ temperature pressure monitoring facility includes several temperature monitoring nodes and pressure monitoring node, and temperature monitoring node is used
Temperature in monitoring In Situ Heating surrounding them environment and the cold spot position of In Situ Heating heated by electrodes scope, is located at as needed
Near the In Situ Heating electrode and cold spot position of In Situ Heating heated by electrodes scope, and can be vertically arranged along electrode in different depths
Degree；Pressure monitoring node is arranged on the most deep degree of electrode buried depth, may be provided in In Situ Heating electrode nearby or In Situ Heating electrode
The cold spot position of heated perimeter.Each temperature monitoring node includes several temperature sensors, and each pressure monitoring node includes number
A pressure sensor is typically every 1~2m, mono- temperature sensor, and sets pressure sensing near the most deep position of repair process
Device.The parameter of whole system monitoring further includes：It inputs to the power of In Situ Heating electrode, the confirmation of heating process, pollutant control
The confirmation of system, instant and accumulation pollutants removal rate.
Groundwater monitoring well is set in the water-bearing layer of area to be repaired or aquitard region, for the ground in monitor and repairing region
The parameters such as lower water level, water quality, water temperature, help are understood to groundwater remediation situation.
Injection well and extraction well in system use common common process, and extraction device is as shown in Figure 3.
Ground processing equipment is depending on the scope of area to be repaired, volume, pollutant characteristic, local regulation are to drainage exhaust
Requirement etc., therefore the actual treatment equipment in specific place is all different.
A kind of contaminated soil original position thermal desorption restorative procedure using above-mentioned repair system comprises the following steps：
S1, leaching reagent is injected by injection well in area to be repaired；
S2, thermal desorption, heated by electrodes are carried out to pollutant by being arranged in the In Situ Heating electrod-array of area to be repaired
Temperature is up to 120 DEG C, and specific heating temperature is according to pollutant feature and repairs requirement setting；
S3, by multiphase or gas phase method for extracting, will be dissolved in the underground water of area to be repaired or be present in soil gas
In pollutant extract former contaminated site, and carry out the processing of sewage and exhaust gas on ground；
S4, it is reduced to when the pollution concentration for detecting the gas in the liquid or exhaust-gas treatment facilities in sewage treatment facility
The setting ratio of maximum possible pollution concentration and continue set duration when, to contaminated soil sample, if reaching reparation desired value,
Stop repairing, high-temperature steam, surfactant or air are otherwise injected by injection well and improve shifting of the pollutant in Polluted area
Dynamic property, and continue repair process.
Step S1 is specifically included：In area to be repaired, leaching reagent is injected by injector well using intermittently or serially mode,
It is entered again by injecting into well the gap of well screen in contaminated soil and underground water, injection well is arranged on extraction well radius of influence scope
Position interior or arranged on subsurface flow where extraction well upstream.Leaching reagent is injected by suction pump to injector well, is specifically added
Dosage needs is added to be determined according to pollutant concentration and scope.
The selectable type of leaching reagent has：Inorganic eluent (inorganic compounds such as acid, alkali, salt)；Chelating agent (EDTA,
NTA, DTPA, citric acid, malic acid etc.)；Surfactant (cation, anionic surfactant)；Bio-surface active
Agent (rhamnolipid, sophorolipid, all graceful, saponin of Sha etc.)；Compound eluent (surfactant and chelating agent use in conjunction).Soil
Earth reagent specifically used when repairing is according to Investigation of Soil Pollution situation selection early period.
The pollutant of liquid and gas is entered by thermal desorption, by applying multiphase extraction technique, underground will be dissolved in
In water and the pollutant that is present in SOIL GAS extracts former contaminated site, and carries out the processing of sewage and exhaust gas on ground,
So as to fulfill to being repaired while contaminated soil and underground water.
Pollutant in aeration zone and water-bearing layer by the effect of In Situ Heating heated by electrodes, takes off from soil particle
It is attached to be dissolved in the water or evaporate into SOIL GAS, it is removed respectively in a manner of drawing water or being evacuated.
More than pollution position level of ground water, positioned at the situation of aeration zone, using gas phase method for extracting, gas phase will be present in
Pollutant extract former contaminated site, and carry out exhaust-gas treatment on ground.
System and method in the present invention is suitable for a variety of site conditions：1st, with clay, silty clay, silt clay etc.
Contaminated site based on clay class soil；2nd, level of ground water is shallow, the plentiful Polluted area of water resource；3rd, it is with sand, silt etc.
Main contaminated site；4th, underground water locating depth, the big place of aeration zone span.
Claims (10)
1. a kind of contaminated soil original position thermal desorption repair system, which is characterized in that including laying several add in-place in the soil
Thermode, several injection wells, several extraction wells, several groundwater monitoring wells and be located on the ground electrode electrical control and regulation set
It applies, in-situ temperature pressure monitoring facility, sewage treatment facility and exhaust-gas treatment facilities；The extraction well is equipped with extraction device, institute
State extraction device connection sewage treatment facility and exhaust-gas treatment facilities；It is described to inject into well equipped with injection device, the injection dress
Put material storing box of the connection equipped with leaching reagent；The In Situ Heating electrode connection electrode Electric control adjusts facility, using positive three
Angular or regular hexagon mode is arranged.
A kind of 2. contaminated soil original position thermal desorption repair system according to claim 1, which is characterized in that the add in-place
The laying spacing of thermode is 3~8m.
A kind of 3. contaminated soil original position thermal desorption repair system according to claim 1, which is characterized in that the add in-place
The depth of placement of thermode extends to 0.4~1.5m below processing target, and extends to 0.4~2m of processing target periphery.
A kind of 4. contaminated soil original position thermal desorption repair system according to claim 1, which is characterized in that the temperature in situ
Spending pressure monitoring facility includes several temperature monitoring nodes and several pressure monitoring nodes, and the temperature monitoring node is used to monitor
The temperature of the cold spot position of In Situ Heating surrounding them environment and In Situ Heating heated by electrodes scope, the pressure monitoring node are set
Put the most deep degree in electrode buried depth.
A kind of 5. contaminated soil original position thermal desorption repair system according to claim 1, which is characterized in that the injection well
Identical with the number of extraction well, the number ratio of the injection well and In Situ Heating electrode is 1：3 to 1：6.
6. a kind of contaminated soil original position thermal desorption repair system according to claim 1, which is characterized in that further include covering
Barrier layer is located above Polluted area.
A kind of 7. contaminated soil original position thermal desorption repair system according to claim 1, which is characterized in that the covering resistance
Interlayer is light-weight foamed cement cap rock.
A kind of 8. contaminated soil original position thermal desorption repair system according to claim 1, which is characterized in that the add in-place
It filler particles graphite and is compacted in drilling where thermode, it is ensured that be closely adjacent to In Situ Heating electrode surface；It is former
Position heating electrode both ends are equipped with the water filling port of connection and are connected with water circulation system, for supplementing In Situ Heating electrode tip position
Heating causes the local water shortage in soil remediation region.
9. a kind of contaminated soil original position thermal desorption restorative procedure, which is characterized in that comprise the following steps：
S1, leaching reagent is injected by injection well in area to be repaired；
S2, thermal desorption is carried out to pollutant by being arranged in the In Situ Heating electrod-array of area to be repaired；
S3, by multiphase or gas phase method for extracting, will be dissolved in the underground water of area to be repaired or be present in soil gas
Pollutant extracts former contaminated site, and carries out the processing of sewage and exhaust gas on ground；
S4, maximum is reduced to when the pollution concentration for detecting the gas in the liquid or exhaust-gas treatment facilities in sewage treatment facility
The setting ratio of possible pollution concentration and continue set duration when, to contaminated soil sample, if reaching reparation desired value, stop
It repairs, high-temperature steam, surfactant or air is otherwise injected by injection well and improve mobility of the pollutant in Polluted area,
And continue repair process.
A kind of 10. contaminated soil original position thermal desorption restorative procedure according to claim 9, which is characterized in that the step
S1 is specifically included：
In area to be repaired, leaching reagent is injected by injector well using intermittently or serially mode, then by injecting into well well screen
Gap enter in contaminated soil and underground water, the injection well be arranged on the extraction well radius of influence in the range of or arranged on extracting
The position of subsurface flow upstream where well.
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