CN106111693A - A kind of method of in-situ immobilization arsenic slag contaminated soil of site - Google Patents
A kind of method of in-situ immobilization arsenic slag contaminated soil of site Download PDFInfo
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- CN106111693A CN106111693A CN201610664507.6A CN201610664507A CN106111693A CN 106111693 A CN106111693 A CN 106111693A CN 201610664507 A CN201610664507 A CN 201610664507A CN 106111693 A CN106111693 A CN 106111693A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
- B09C1/085—Reclamation of contaminated soil chemically electrochemically, e.g. by electrokinetics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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Abstract
A kind of method that the invention discloses in-situ immobilization arsenic slag contaminated soil of site, comprises the steps: to pulverize the arsenic slag place of natural air drying, As polluted soil, sieves；Above-mentioned soil mixes with deionized water, and making soil moisture content is 25% 45%, stirring, equilibrium；By the Soil Utilization electronic PRB technology combine d bioremediation under the conditions of electrolyte, Contrast agent pH5 7 after above-mentioned equilibrium, wherein the medium of PRB is Fe °.The method utilizes electric repairing technique to be used in combination with PRB, can be in conjunction with electronic and PRB technology advantage, improve the removal efficiency of Arsenic in Soil, repair time is shorter, and not disturbed soil, it is adaptable to the soil of hypotonicity, the most recyclable arsenic, can effectively reduce secondary pollution, reduce subsequent treatment workload, and increase economic efficiency.
Description
Technical field
The invention belongs to Environmental Technology soil pollution recovery technique field, particularly relate to a kind of in-situ immobilization arsenic slag place dirty
The method of dye soil.
Background technology
Arsenic slag is the solid slag of a kind of severe toxicity, and main source is containing the discharge in arsenic exploitation of mineral resources and smelting process, collection
Middle generation in Xinjiang, the Inner Mongol, Hunan Province, the ground such as Guangdong Province.The arsenic mineral resources of China account for the 70% of whole world total amount, are containing
Behaviour area, arsenic minerals mountain, annual arsenic slag yield is about 50 tons, in a large number without the idle slag Han arsenic minerals of harmless process, arbitrarily stacking, leads
Cause soil near arsenic entrance and cause the pollution of large-area arsenic in soil.Arsenic in soil pollutes and has disguise, chronicity and irreversible
Property etc. feature, therefore soil is polluted by arsenic once, and its difficulty of governance is big and the cycle is long.
At present, process As polluted soil main method have soil moved in improve the original method, elution method, solidification/stabilization method, phytoremediation and
Electro reclamation method.Soil moved in improve the original method quantities is relatively big, wastes time and energy.Elution method and curing/stabilizing method be not by thorough for the arsenic in soil
The end, removes, and easily causes the secondary pollution of soil, and is unsuitable for extensive site remediation.Phytoremediation is typically time-consumingly longer,
The time of decades may be needed.Electric repair method, as a kind of emerging based technique for in-situ remediation, has simple to operate, applicable
Property strong, the feature such as the cycle is short, but electro reclamation is by contaminant transportation to electrode solution, needs after-treatment.
Summary of the invention
In order to solve above-mentioned technical problem, the present invention provides a kind of method of in-situ immobilization arsenic slag contaminated soil of site, should
Method utilizes electric repairing technique to be used in combination with PRB, can improve Arsenic in Soil in conjunction with electronic and PRB technology advantage
Removal efficiency, repair time is shorter, and not disturbed soil, it is adaptable to the soil of hypotonicity, the most recyclable arsenic, it is possible to effectively
Reduce secondary pollution, reduce subsequent treatment workload, and increase economic efficiency.
The present invention is achieved by the following technical solutions:
A kind of method of in-situ immobilization arsenic slag contaminated soil of site, comprises the steps:
(1) the arsenic slag place of natural air drying, As polluted soil are pulverized, sieve；
(2) above-mentioned soil mixes with deionized water, and making soil moisture content is 25%-45%, stirring, equilibrium；
(3) by the Soil Utilization electronic-PRB technology after above-mentioned equilibrium at electrolyte, Contrast agent, the pH5-7 condition second line of a couplet
Closing and repair, wherein the medium of PRB is Fe °.
Arsenic slag place described in above-mentioned steps (1), As polluted soil preferred arsenic slag muck put place soil, and soil is weak acid
Property, pH value is typically between 5-7, and wherein the concentration of Arsenic in Soil is higher, total arsenic concentration typically 100-100000mg/kg it
Between.
Above-mentioned steps is sieved described in (1), and preferably fineness is not higher than 0.50mm.
Soil described in above-mentioned steps (2) and deionized water are (1-5) by quality volume (kg/L) ratio: (0.5-1.5) mixes
Close, preferably 1-3:1, optimal 2:1.
Step (2) described equilibrium 1-3 days, preferably equilibrium 1 day, in uniform shale shape.
Electronic-PRB technology described in above-mentioned steps (3) refers to electric repairing technique and permeable coefficient tensor (PRB)
Recovery technique combines.The thickness of wherein said Fe ° of-PRB is 1-5cm, preferably 3-5cm.
Described electrolyte includes potassium chloride, sodium chloride etc., preferably sodium chloride solution, and concentration is 0.05-0.15mol/L, excellent
Select 0.08-0.1mol/L, optimal 0.1mol/L.
Described Contrast agent includes but not limited to edta edta, 1-hydroxy ethylidene-1,1-diphosphonic acid HEDP, divinyl
Triamine five methylenephosphonic acid DTPMPA etc., preferably edta edta.Contrast agent EDTA of the present invention carries out complexation
Reaction, does not quote new pollutant, and in processing procedure, EDTA can react the network forming the dissolved with Arsenic in Soil hydrochlorate
Compound, improves the mobility of arsenic, thus improves the remediation efficiency that arsenic in soil pollutes.
Described Contrast agent concentration is 0.001-0.1mol/L, preferably 0.003-0.005mol/L, optimal 0.005mol/L.
Acid ph value described in step of the present invention (3) needs to be adjusted by pH regulator liquid.Described regulation liquid includes
But it is not limited to acetic acid, formic acid, sodium hydroxide, potassium hydroxide, sodium bicarbonate etc., preferably acetic acid and/or sodium hydroxide.Described pH exists
Between 5-7.The present invention keeps faintly acid, can effectively control the OH produced in processing procedure-In soil migrate so that soil
Earth pH becomes the most alkaline.
Electronic-PRB technology described in step of the present invention (3) uses following device operation.
Electronic-PRB the prosthetic device that the present invention uses, including: soil sample chamber, anode chamber, cathode chamber, DC source, electric current
Table, filter screen, pH regulator system, electrode, spout hole, acid storage, lye tank (vat), collecting tank, Fe ° of-PRB.
Wherein, soil sample chamber is that its dimension scale is for long: wide: height=3:2:1, in soil sample chamber for loading for examination soil
Add Fe ° of-PRB.Soil sample chamber the right and left adjacent for anode chamber, cathode chamber, described anode chamber, cathode chamber are the longest:
Wide: height=1:2:1.The inwall that soil sample chamber is adjacent with room, positive and negative pole posts 400-650 mesh filter screen (preferably 500 mesh), at sun
Being provided with electrode in the middle of room, pole, cathode chamber, adopted by two electrodes and run wires to, centre is provided with DC source, and (voltage gradient is 1-
2V/cm), ammeter.Electrode uses bar-shaped graphite electrode, and electrode is individually placed to the anode chamber and the cathode chamber center, inserts the anode chamber and the cathode chamber
Bottom.Acid storage is connected by sebific duct with cathode chamber, and centre is provided with pH regulator system, and lye tank (vat) is with anode chamber by sebific duct even
Connecing, centre is provided with pH regulator system；Cathode chamber is provided with spout hole with the upper end of anode chamber, and spout hole is connected to collect by conduit
Groove.
PH regulator system is mainly made up of pH electrode, peristaltic pump, software control system；Set pH scope, when pH electrode is surveyed
Anode chamber or cathode chamber pH when exceeding the pH scope of setting, instructed to peristaltic pump by software control system, peristaltic pump will be joined
The regulation liquid put collapses into cathode chamber or anode chamber, thus regulates pH to regulate between pH to 5-7.Described pH regulator liquid includes: drip
It is added on the acetic acid solution of described cathode chamber；And/or drip in the sodium hydroxide solution of described anode chamber.
Beneficial effect
In order to better illustrate beneficial effects of the present invention, carried out by following test example.
Electronic and the PRB combined remediation technology of test example 1 present invention and the repair rate contrast experiment of electro reclamation
One, operational approach:
1、
The present invention operates with PRB combined remediation technology according to embodiment 1 is electronic.
Step (1) takes the arsenic contaminated soil after natural air drying, and (wherein, this total Arsenic In Soil content is that the total arsenic of soil contains
Amount 447.5mg/kg, soil As (III) content 67.9mg/kg, soil As (V) content 379.6mg/kg, pH=6.8), reject it
Middle foreign material, after using pulverizer to pulverize, crossing fineness is after 0.50mm sieves, stand-by；
The deionized water of above-mentioned stand-by soil 5kg with 2.5L is mixed by step (2), uses stainless steel shovel to stir, quiet
Put one day；
Step (3) take above-mentioned equilibrium after soil 4kg in the soil sample chamber of electronic/PRB combine d bioremediation device, wherein, soil sample chamber
Size 30cm × 20cm × 10cm, the yin, yang electrode chamber size 10cm × 20cm × 10cm at two ends, soil sample chamber two ends place 500
Mesh filter cloth, prevents soil mobility Zhiyin, anode chamber in repair process, and cathode and anode room is full of the KCl solution of 0.1mol/L, with
Time to cathode chamber dropping 0.005mol/L Contrast agent EDTA solution；
Graphite electrode is inserted the anode chamber and the cathode chamber centre position by step (4), inserts to bottom, connects DC source and electric current
Table, maintaining DC voltage gradient is 2V/cm, continues to reparation to terminate；
Wherein, in repair process, monitoring anode and cathode liquid pH value in real time, and use pH balance-conditioning system, use and wriggle
Pump drips acetic acid solution and sodium hydroxide solution respectively in anode and cathode liquid, and anode and cathode liquid pH is between 5-7 in regulation, keeps weak acid
Property.
2、
Electric repairing technique: according to prior art operation, concrete operations
Step (1) takes the arsenic contaminated soil after natural air drying, and (wherein, this total Arsenic In Soil content is that the total arsenic of soil contains
Amount 447.5mg/kg, soil As (III) 67.9mg/kg, soil As (V) content 379.6mg/kg, pH=6.8), reject the most miscellaneous
Thing, after using pulverizer to pulverize, crossing fineness is after 0.50mm sieves, stand-by；
The deionized water of above-mentioned stand-by soil 5kg with 2.5L is mixed by step (2), uses stainless steel shovel to stir, quiet
Put one day；
Step (3) take above-mentioned equilibrium after soil 4kg in the soil sample chamber of electro reclamation device, wherein, soil sample chamber size 30cm
× 20cm × 10cm, the yin, yang electrode chamber size 10cm × 20cm × 10cm at two ends, soil sample chamber two ends place 500 mesh filter clothes, anti-
Only soil mobility Zhiyin, anode chamber in repair process, be full of the KCl solution of 0.1mol/L, simultaneously to cathode chamber by cathode and anode room
The Contrast agent EDTA solution of dropping 0.005mol/L；
Graphite electrode is inserted the anode chamber and the cathode chamber centre position by step (4), inserts to bottom, connects DC source and electric current
Table, maintaining DC voltage gradient is 2V/cm, continues to reparation to terminate；
Wherein, in repair process, monitoring anode and cathode liquid pH value in real time, and use pH balance-conditioning system, use and wriggle
Pump drips acetic acid solution and sodium hydroxide solution respectively in anode and cathode liquid, and anode and cathode liquid pH is between 5～7 in regulation, keeps weak
Acid.
Two, arsenic assay method:
Measure according to prior art: by pedotheque after (1+1) chloroazotic acid Water bath, use atomic fluorescence spectrometry to survey
Fixed total arsenic concentration.
Three, result:
After test run five days, repairing effect is as shown in table 1.The inventive method is electronic/and total arsenic goes by PRB combine d bioremediation
Except effect has reached 40%, and mainly existing with residual form arsenic, the bioavailability of residual arsenic reduces.Compare the most electronic repairing
Multiple arsenic removal efficiency 16% is obviously improved.Meanwhile, energy consumption is reduced to 6.43kWh/g by 7.44kWh/g.
The result of the test of table 1 test example 1
Four, conclusion
The original position of the present invention removes the restorative procedure of Arsenic in Soil, is primarily directed in the soil of actual arsenic slag contaminated sites
The removal of arsenic.The feature of arsenic slag contaminated soil is that concentration is high, how to exist with residual form arsenic, only by electrical means removal efficiency not
High.Using electronic and PRB combine d bioremediation and add Contrast agent strengthening in catholyte, in processing procedure, arsenic is at electricity
Under migration, a part migrates in electrolyte, a part during PRB by Fe ° of Adsorption；Meanwhile, EDTA
Addition can react the complex forming the dissolved with indissoluble state arsenate in soil, improve the mobility of arsenic, thus improve
The remediation efficiency that arsenic in soil pollutes.Under identical time and voltage gradient, go the amount of arsenic removal to increase, be effectively reduced specific energy consumption,
Save energy cost.
Test example two, join soil test
Material: using industry Kaolin as test soil, configuration simulating pollution total Arsenic In Soil concentration is 500mg/kg
Method: the method for embodiment one
Result: record the removal efficiency to total arsenic and reached 77%.
Electronic and the PRB United Technologies parameter of test example three present invention selects
1, pH value selects
Material: using industry Kaolin as test soil, configuration simulating pollution total Arsenic In Soil concentration is 500mg/kg.
Method: embodiment one method is tested according to PH described in table 2
Result: be shown in Table 2
The result of the test of table 2pH value
Conclusion: as seen from Table 2, along with pH value increases, removal efficiency increases, but when PH reaches 8, removal effect substantially drops
Low, during PH5-7, removal effect reaches more than 70%.
2, the selection of electrolyte concentration
Material: using industry Kaolin as test soil, configuration simulating pollution total Arsenic In Soil concentration is 500mg/kg.
Method: embodiment one method, electrolyte is carried out according to concentration in table 3.
Result: be shown in Table 3
The result of the test of table 3 electrolyte concentration
Conclusion: as seen from Table 3, sodium chloride concentration 0.05-0.15mol/L effect reaches more than 70%, 0.1mol/L effect
The most obvious.
3, the selection of EDTA concentration
Material: using industry Kaolin as test soil, configuration simulating pollution total Arsenic In Soil concentration is 500mg/kg.
Method: embodiment one method, EDTA is carried out according to concentration in table 4.
Result: be shown in Table 4
The result of the test of table 4 electrolyte concentration
Conclusion: as seen from Table 4, EDTA concentration 0.003-0.008mol/L effect reaches more than 75%, and 0.005mol/L is imitated
Fruit is the most obvious.
In this research, electronic-PRB combine d bioremediation actual As polluted soil technical parameter is chosen as: pH is 5-7, electrolyte
For the KCl of 0.1mol/L, when Contrast agent EDTA concentration is 0.005mol/L, obtain optimum repairing effect, Arsenic in Soil
Removal efficiency is more than 70%.
In a word,
1, after equalizing in the method for the present invention, soil is during electronic/PRB combine d bioremediation, pentavalent arsenic and three in soil
Valency arsenic moves in anode chamber and cathode chamber electrolyte with the form of oxo-anions group and cation group respectively respectively, with
And occur adsorption to remove with Fe ° of PRB medium.In repair process, and use pH balance-conditioning system, to cathode and anode liquid
Middle dropping acetic acid solution and sodium hydroxide solution, the electrolyte of regulation anode and cathode so that it is pH, between 5-7, keeps faintly acid, can
Effectively to control the OH that catholyte produces-Migrate so that soil pH becomes the most alkaline in soil.
2, a kind of original position that the present invention provides removes the restorative procedure of Arsenic in Soil, uses chelating agent 0.005mol/L's
EDTA solution is strengthened, and does not introduce new pollutant, and in processing procedure, EDTA can react shape with Arsenic in Soil hydrochlorate
Become the complex of the dissolved, improve the mobility of arsenic, thus improve the remediation efficiency that arsenic in soil pollutes.Move during electro reclamation
The arsenic of removal soil is mainly based on acetic acid bound residue, reducible extraction state and oxidable extraction state, and the biology of residual arsenic can
Usability reduces, and reduces environmental risk；Under identical time and voltage gradient, go the amount of arsenic removal to increase, be effectively reduced unit energy
Consumption, saves energy cost.
3, the restorative procedure of the present invention is by the arsenic in soil under electric field migration, and a part migrates in electrolyte,
A part during PRB by Fe ° of Adsorption；Repair process is not limited by temperature, can be in various temperature conditionss
Lower operation, and run simple to operate, it is simple to promote.
4, the present invention provide a kind of original position remove Arsenic in Soil restorative procedure arsenic slag muck is put place soil, soil in
Faintly acid, pH value is typically between 5-7.Especially higher to the concentration of Arsenic in Soil, total arsenic concentration is typically at 100-
Between 100000mg/kg, using the original position of the present invention to remove the restorative procedure of Arsenic in Soil, effect is preferable.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of the electronic/PRB combine d bioremediation device used by the present invention.
Wherein, 1-soil sample chamber, 2-anode chamber, 3-cathode chamber, 4-DC source, 5-ammeter, 6-filter screen, 7-pH regulate system
System, 8-electrode, 9-spout hole, 10-acid storage, 11-lye tank (vat), 12-collecting tank, 13-Fe ° of-PRB
Detailed description of the invention
Further illustrate the present invention by the following examples, but not as limitation of the present invention.
Embodiment 1
A kind of original position removes the restorative procedure of Arsenic in Soil, comprising:
(1) take the arsenic contaminated soil of natural air drying, reject wherein foreign material, after using pulverizer to pulverize, cross 0.50mm grain
The standard screen in footpath, stand-by；
(2) being mixed with 2:1 deionized water by above-mentioned stand-by soil so that it is moisture content 30%, stir post-equalization one day；
(3) after taking above-mentioned equilibrium, soil is in the soil sample chamber of electronic/PRB combine d bioremediation device, and soil sample two ends place 500 mesh
Filter cloth, prevents soil mobility in repair process to the anode chamber and the cathode chamber, cathode and anode room to be full of electrolyte, and electrolyte uses 0.1mol/
The KCl solution of L, adds the Contrast agent EDTA solution that concentration is 0.005mol/L in cathode chamber simultaneously.
(4) graphite electrode inserting the anode chamber and the cathode chamber centre position, insert to bottom, connect power supply and ammeter, reparation is opened
After beginning, regulate voltage gradient 2V/cm, continue to reparation to terminate.
Wherein, in repair process, monitoring anode and cathode liquid pH value in real time, and use pH balance-conditioning system, use and wriggle
Pump drips acetic acid solution to the electrolyte of negative electrode, drips sodium hydroxide solution, to regulate catholyte in the electrolyte of anode
The respective pH of liquid, anolyte, makes each electrolyte be between 5-7, keeps faintly acid.
It is 40%. through measuring the clearance to total arsenic
Embodiment 2
A kind of original position removes the restorative procedure of Arsenic in Soil, comprising:
(1) take the arsenic contaminated soil of natural air drying, reject wherein foreign material, after using pulverizer to pulverize, cross 0.50mm grain
The standard screen in footpath, stand-by；
(2) being mixed with deionized water 1:1 by above-mentioned stand-by soil so that it is moisture content 25%, stir post-equalization one day；
(3) after taking above-mentioned equilibrium, soil is in the soil sample chamber of electronic-PRB combine d bioremediation device, and soil sample two ends place 400 mesh
Filter cloth, prevents soil mobility in repair process to the anode chamber and the cathode chamber, cathode and anode room to be full of electrolyte, and electrolyte uses
The KCl solution of 0.05mol/L, adds the Contrast agent EDTA solution that concentration is 0.001mol/L in cathode chamber simultaneously.
(4) graphite electrode inserting the anode chamber and the cathode chamber centre position, insert to bottom, connect power supply and ammeter, reparation is opened
After beginning, regulate voltage gradient 1V/cm, continue to reparation to terminate.
Wherein, in repair process, monitoring anode and cathode liquid pH value in real time, and use pH balance-conditioning system, use and wriggle
Pump drips acetic acid solution to the electrolyte of negative electrode, drips sodium hydroxide solution, to regulate catholyte in the electrolyte of anode
The respective pH of liquid, anolyte, makes each electrolyte be in 6, keeps faintly acid.
It is 37% through measuring the clearance to total arsenic.
Embodiment 3
A kind of original position removes the restorative procedure of Arsenic in Soil, comprising:
(1) take the arsenic contaminated soil of natural air drying, reject wherein foreign material, after using pulverizer to pulverize, cross 0.50mm grain
The standard screen in footpath, stand-by；
(2) being mixed with deionized water 3:1 by above-mentioned stand-by soil so that it is water distribution moisture content 45%, stir post-equalization
One day；
(3) after taking above-mentioned equilibrium, soil is in the soil sample chamber of electronic/PRB combine d bioremediation device, and soil sample two ends place 650 mesh
Filter cloth, prevents soil mobility in repair process to the anode chamber and the cathode chamber, cathode and anode room to be full of electrolyte, and electrolyte uses
The KCl solution of 0.15mol/L, adds the Contrast agent EDTA solution that concentration is 0.1mol/L in cathode chamber simultaneously.
(4) graphite electrode inserting the anode chamber and the cathode chamber centre position, insert to bottom, connect power supply and ammeter, reparation is opened
After beginning, regulate voltage gradient 2V/cm, continue to reparation to terminate.
Wherein, in repair process, monitoring anode and cathode liquid pH value in real time, and use pH balance-conditioning system, use and wriggle
Pump drips acetic acid solution to the electrolyte of negative electrode, drips sodium hydroxide solution, to regulate catholyte in the electrolyte of anode
The respective pH of liquid, anolyte, makes each electrolyte be in 7, keeps faintly acid.Through measuring the clearance to total arsenic it is
47%.
Embodiment 4 electro reclamation device
Electronic/PRB prosthetic device that the present invention uses, as it is shown in figure 1, include: soil sample chamber (1), anode chamber (2), negative electrode
Room (3), DC source (4), ammeter (5), filter screen (6), pH regulator system (7), electrode (8), spout hole (9), acid storage
(10), lye tank (vat) (11), collecting tank (12), Fe ° of-PRB (13).
Wherein, soil sample chamber (1) is that its dimension scale is for long: wide: height=3:2:1 for loading for examination soil.In soil sample chamber
(1) adding Fe ° of-PRB (13) in, thickness is 5cm.Soil sample chamber (1) the right and left adjacent for anode chamber (2), cathode chamber
(3), anode chamber (2), cathode chamber (3) are the longest: wide: height=1:2:1.On the inwall that soil sample chamber is adjacent with room, positive and negative pole
Post filter screen (6), in the middle of anode chamber (2), cathode chamber (3), be respectively equipped with electrode 8, two electrodes adopted and runs wires to, in
Between be provided with DC source (4), ammeter (5).Electrode uses bar-shaped graphite electrode, and electrode is individually placed to the anode chamber and the cathode chamber center
And insert bottom the anode chamber and the cathode chamber.
Acid storage (10) is connected by sebific duct with cathode chamber (3), and centre is provided with pH regulator system (7), lye tank (vat) (11) with
Anode chamber (2) is connected by sebific duct, and centre is provided with pH regulator system (7)；Cathode chamber (3) is provided with excessive with the upper end of anode chamber (2)
Discharge orifice (9), spout hole (9) is connected to collecting tank (12) by conduit.
PH regulator system is mainly formed (pH electrode, peristaltic pump, software control by pH electrode, peristaltic pump, software control system
System diagram 1 does not mark)；Set pH scope, when pH electrode records anode chamber or cathode chamber pH exceedes the pH scope of setting,
Being instructed to peristaltic pump by software control system, acid solution or the alkali liquor of configuration are collapsed into cathode chamber or anode chamber by peristaltic pump, thus
Regulation pH.
Claims (10)
1. a method for in-situ immobilization arsenic slag contaminated soil of site, comprises the steps:
(1) the arsenic slag place of natural air drying, As polluted soil are pulverized, sieve；
(2) above-mentioned soil mixes with deionized water, and making soil moisture content is 25%-45%, stirring, and equilibrium is in uniform shale shape；
(3) the Soil Utilization electronic-PRB technology after above-mentioned equilibrium is combined under electrolyte, Contrast agent, acid condition repair
Multiple, wherein the medium of PRB is Fe °.
2. the method for claim 1, it is characterised in that described arsenic slag place, As polluted soil are that arsenic slag muck puts place
Soil, soil is faintly acid, pH value between 5-7, wherein soil total arsenic concentration 100-100000mg/kg.
3. the method for claim 1, it is characterised in that fineness of sieving described in step (1) is not higher than 0.50mm.
4. the method for claim 1, it is characterised in that soil described in step (2) and deionized water are by quality volume
Ratio is 1-5:0.5-1.5, preferably 1-3:1, optimal 2:1.
5. the method for claim 1, it is characterised in that the thickness of step (3) described Fe ° of-PRB is 1-5cm, preferably 3-
5cm。
6. the method for claim 1, it is characterised in that step (3) described electrolyte includes that potassium chloride or sodium chloride are molten
Liquid, concentration is 0.05-0.15mol/L, preferably 0.08-0.1mol/L, optimal 0.1mol/L.
7. the method for claim 1, it is characterised in that the Contrast agent described in step (3) is ethylenediaminetetraacetic acid
One in EDTA, 1-hydroxy ethylidene-1,1-diphosphonic acid HEDP, diethylene triamine pentamethylene phosphonic DTPMP, concentration is 0.001-0.1mol/L,
Preferably 0.003-0.005mol/L, optimal 0.005mol/L.
8. the method for claim 1, it is characterised in that the acid ph value 5-7 described in step (3), needs to pass through pH
Regulation liquid is adjusted, and described pH regulator liquid includes: acetic acid solution and/or sodium hydroxide solution.
9. the method for an in-situ immobilization arsenic slag contaminated soil of site, it is characterised in that comprise the steps:
(1) by the arsenic slag place As polluted soil of natural air drying, pulverize, sieve；
(2) soil after sieving mixes with deionized water, makes the moisture content of soil reach setting value, and stir post-equalization；
(3) being put into by the soil after equilibrium in the soil sample chamber of electronic-PRB prosthetic device, in soil sample chamber, vertical electric field direction sets
Put the PRB that medium is Fe °；In described electronic-PRB prosthetic device, soil sample chamber two ends are respectively cathode chamber, anode chamber；
(4) add electrolyte to described anode chamber, add electrolyte and Contrast agent to cathode chamber, and insert graphite electricity respectively
Pole, switches on power and makes electric current carry out electronic-PRB combine d bioremediation by described soil chamber.
10. method as claimed in claim 9, it is characterised in that comprise the steps:
(1) by the arsenic slag place As polluted soil of natural air drying, pulverize, sieve below 0.50mm；
(2) soil after sieving is that 1-5:0.5-1.5 mixes with deionization by mass volume ratio, makes the moisture content of soil reach
25%-45%, stir post-equalization one day；
(3) soil after equilibrium is put in the soil sample chamber of electronic-PRB prosthetic device, compacting, vertical electric field side in soil sample chamber
To arranging the PRB that medium is Fe °, the thickness of described Fe ° of-PRB is 1-5cm.；Soil sample chamber two in described electronic-PRB prosthetic device
End is respectively cathode chamber, anode chamber；
(4) add the KCl solution of 0.05-0.15mol/L to described anode chamber, add 0.05-0.15mol/L's to cathode chamber
KCl solution and the EDTA solution that concentration is 0.001-0.1mol/L, and insert graphite electrode respectively, the voltage gradient that switches on power is
1-2V/cm, makes electric current carry out electronic-PRB combine d bioremediation by described soil chamber, use peristaltic pump respectively to described cathode chamber,
Anode chamber's dropping pH regulator liquid, to regulate between pH to 5-7；It is molten that described pH regulator liquid includes dripping the acetic acid in described cathode chamber
Liquid；And/or drip in the sodium hydroxide solution of described anode chamber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610664507.6A CN106111693A (en) | 2016-08-12 | 2016-08-12 | A kind of method of in-situ immobilization arsenic slag contaminated soil of site |
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| CN109317506A (en) * | 2018-09-05 | 2019-02-12 | 上海大学 | The method repaired the electric device of As polluted soil and repair As polluted soil |
| CN110180886A (en) * | 2019-07-05 | 2019-08-30 | 河南科技大学 | A kind of device and method of in-situ immobilization fluoride pollution soil |
| CN110479752A (en) * | 2019-07-08 | 2019-11-22 | 南京迪天高新产业技术研究院有限公司 | A kind of electric repair method for hyposmosis contaminated soil |
| CN112170474A (en) * | 2020-09-06 | 2021-01-05 | 桂林理工大学 | Method for repairing arsenic-polluted soil by electrically-driven reinforced permeable reactive barrier |
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| CN113182349A (en) * | 2021-06-08 | 2021-07-30 | 福州大学 | Method for restoring chromium-polluted soil by utilizing electro-dynamic coupling permeation reaction wall |
| CN113736471A (en) * | 2021-09-22 | 2021-12-03 | 中国科学院沈阳应用生态研究所 | Cadmium-lead-arsenic contaminated soil composite eluting agent and preparation method thereof |
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| CN108326030A (en) * | 2018-01-11 | 2018-07-27 | 上海理工大学 | The heavy metal-polluted soil prosthetic device of convertible array-type electrode |
| CN108326030B (en) * | 2018-01-11 | 2020-11-24 | 上海理工大学 | Soil heavy metal prosthetic devices of convertible array electrode |
| CN109013689A (en) * | 2018-06-26 | 2018-12-18 | 北京高能时代环境技术股份有限公司 | A kind of restorative procedure of As polluted soil |
| CN109013689B (en) * | 2018-06-26 | 2021-06-01 | 北京高能时代环境技术股份有限公司 | Remediation method for arsenic-contaminated soil |
| CN109317506A (en) * | 2018-09-05 | 2019-02-12 | 上海大学 | The method repaired the electric device of As polluted soil and repair As polluted soil |
| CN110180886B (en) * | 2019-07-05 | 2021-03-02 | 河南科技大学 | Device and method for in-situ remediation of fluorine-contaminated soil |
| CN110180886A (en) * | 2019-07-05 | 2019-08-30 | 河南科技大学 | A kind of device and method of in-situ immobilization fluoride pollution soil |
| CN110479752A (en) * | 2019-07-08 | 2019-11-22 | 南京迪天高新产业技术研究院有限公司 | A kind of electric repair method for hyposmosis contaminated soil |
| CN110479752B (en) * | 2019-07-08 | 2021-07-30 | 南京迪天高新产业技术研究院有限公司 | Electric restoration method for low-permeability polluted soil |
| CN112170474A (en) * | 2020-09-06 | 2021-01-05 | 桂林理工大学 | Method for repairing arsenic-polluted soil by electrically-driven reinforced permeable reactive barrier |
| JP2022044528A (en) * | 2020-09-06 | 2022-03-17 | 桂林理工大学 | Repair method of arsenic-contaminated soil due to electromotive strengthening penetrative reactive wall |
| CN112255062A (en) * | 2020-10-19 | 2021-01-22 | 林惠明 | Soil soluble salt detection device and detection method |
| CN113182349A (en) * | 2021-06-08 | 2021-07-30 | 福州大学 | Method for restoring chromium-polluted soil by utilizing electro-dynamic coupling permeation reaction wall |
| CN113736471A (en) * | 2021-09-22 | 2021-12-03 | 中国科学院沈阳应用生态研究所 | Cadmium-lead-arsenic contaminated soil composite eluting agent and preparation method thereof |
| CN114192562A (en) * | 2021-11-19 | 2022-03-18 | 中国科学院南京土壤研究所 | Method for removing polycyclic aromatic hydrocarbons in soil by combining electric remediation with anodic oxidation |
| CN114951258A (en) * | 2022-05-30 | 2022-08-30 | 四川省自然资源科学研究院(四川省生产力促进中心) | Method for restoring soil by combining plant extract with EK-PRB |
| CN115041517A (en) * | 2022-06-29 | 2022-09-13 | 桂林理工大学 | Method for electrically driving and strengthening removal of arsenic pollution in soil |
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