CN104070059B - A kind of drip washing stabilisation restorative procedure of processing lead-contaminated soil - Google Patents
A kind of drip washing stabilisation restorative procedure of processing lead-contaminated soil Download PDFInfo
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Abstract
The invention discloses a kind of drip washing stabilisation restorative procedure of processing lead-contaminated soil, comprise the steps: that (1) is 4～6 times at 4～20 DEG C, pH, Soil leaching agent is mixed with lead-contaminated soil, be uniformly mixed 30～60min, leachate is washed in removal, must wash the soil after pouring; (2) soil stabilization medicament is mixed with the soil of washing after pouring, dispose 3～5 days. The present invention adopts and first washes the technology of drenching rear stabilization, at normal temperatures, by chemical leaching effect, the lead in contaminated soil is enriched in drip washing filtrate, after washing pouring, soil is stabilization agent reaction, under normal temperature and pressure conditions, form stable lead phosphate quasi-mineral by physics chemical action, contaminated soil for concentration of lead contamination lower than 1000mg/kg, the leaching concentration of Lead In Soil is lower than 1mg/L after treatment.
Description
Technical field
The present invention relates to soil pollution processing technology field, be specifically related to a kind of lead-contaminated soil of processingDrip washing stabilisation restorative procedure.
Background technology
The industries such as lead-acid accumulator, plating, metallurgy produce, transport and storage process in, due toMisoperation or carelessness usually can cause the leakage of raw material, semi-finished product and product, and then to environmentPollute. And due to the characteristic of heavy metal lead, cause facial pallor easily to pass through respectively by physical-chemical reactionKind of route of exposure, in the form entered environment with lead ion, due to very risky to health of lead,Especially be there is to serious threat in infant healthy and safe, therefore should preferentially control and process. ButThe characteristic due to heavy metal pollution, be difficult to by pollution remove or the mode of degrading by it from environmentIn medium, thoroughly eliminate, and facial pallor easily organic matter and other chemical substances with soil in be combined, enter oneStep has increased the plumbous difficulty of removing in contaminated soil.
Along with the iterative method of country's " move back two and enter three " implementation and the regulation of our province heavy polluted industry,Relate in a large number polluted enterprises and close, stop, merge and shift one after another, it is plumbous that this wherein has sizable a part of enterprise to relate toUse and sell or transport, such as electroplating industry, lead-acid accumulator production, assembling and processing enterprise,Therefore how to process the retired lead contamination problem of leaving in place of these enterprises and become our province environmentA new thermoelectricity of protection research.
For example, the Chinese invention patent application document that publication number is CN102500612A discloses onePlant the chemical leaching repairing method for restoration of soil polluted by heavy metal, utilize Na2EDTA solution to drenchWash heavy-metal contaminated soil, effectively remove soil available Cd and lead, and utilize Na2S9H2OPrecipitate the heavy metal in filtrate, Na2EDTA is discharged again, thereby reach Na2EDTAThe recycled for multiple times of solution, the Na2EDTA solution drip washing heavy-metal contaminated soil after recovery, dirtThe clearance that dyes soil available Cd reaches 81.6-81.8%, and the clearance of available state Pb reaches55.9-60.1％。
Publication number be the Chinese invention patent application document of CN103286123A disclose a kind of forAdminister the technique of heavy-metal contaminated soil, for to containing the heavy metal-polluted of nickel, zinc, arsenic, lead, copperDye soil reparation, the reparation of heavy-metal contaminated soil is had to following concrete steps, a, treatingIn restoration of soil polluted by heavy metal, add pH adjusting agent, evenly rear placement to be mixed carried out maintenance; B,In mixed heavy-metal contaminated soil to be repaired, add apatite and sulfide, uniform stirring is follow-upMaintenance is carried out in continuous placement; C, in heavy-metal contaminated soil to be repaired, add curing agent, treat evenly to stirMix rear placement and proceed maintenance; D, treat restoration of soil polluted by heavy metal and carry out sample detecting.
It is efficiently soil remediation method fast of one that chemical leaching is processed heavy-metal contaminated soil, stillOwing to being subject to the not high restriction of elution efficiency when lower of the recovery difficulty of eluent and pollutant levels, changeLearn the heavy-metal contaminated soil processing that drip washing is mainly used in middle and high concentration; Chemical stabilization is disposed a huge sum of moneyBelonging to contaminated soil is a kind of soil remediation method of economical rationality, but heavy metal-polluted for high concentrationDye soil, need a large amount of stabilization agents pollutant to be carried out to stabilisation, its processing cost and processingEffect is all vulnerable to impact in various degree.
Summary of the invention
The invention provides a kind of drip washing stabilisation restorative procedure of processing lead-contaminated soil, adopt and first washStable technical scheme after drenching, is greater than 500mg/kg, is less than 1000mg/kg for concentration of lead contaminationContaminated soil there is significant treatment effect.
A drip washing stabilisation restorative procedure of processing lead-contaminated soil, comprises the steps:
(1) be 4～6 times at 4～20 DEG C, pH, Soil leaching agent mixed with lead-contaminated soil,Be uniformly mixed 30～60min, remove and wash leachate, must wash the soil after pouring;
(2) soil stabilization medicament is mixed with the soil of washing after pouring, dispose 3～5 days.
The present invention adopts and first washes the technology of drenching rear stabilization, at normal temperatures, and will by chemical leaching effectLead in contaminated soil is enriched in drip washing filtrate, and wash the rear soil of pouring and be stabilization agent reaction,Under normal temperature and pressure conditions, form stable lead phosphate quasi-mineral by physics chemical action, for plumbous dirtyDye the contaminated soil of concentration lower than 1000mg/kg, the leaching concentration of Lead In Soil is lower than 1 after treatmentmg/L。
As preferably, described in step (1), the mass ratio of Soil leaching agent and lead-contaminated soil is 2:1～8:1; Further preferably, the mass ratio of described Soil leaching agent and lead-contaminated soil is 2:1～6：1。
As preferably, with molar concentration meter, the consisting of of described Soil leaching agent:
Na2-EDTA0.05mol/L～0.2mol/L, hydrochloric acid 0.01mol/L～0.05mol/L,Citric acid 0.01mol/L～0.05mol/L, all the other components are water.
As preferably, soil stabilization medicament described in step (2) with wash drench after the mass ratio of soilExample is 1:20～1:50; Further preferably, described soil stabilization medicament and the matter of washing the rear soil of pouringAmount ratio is 1:20～1:30.
As preferably, by percentage to the quality, the consisting of of described soil stabilization medicament:
Sodium dihydrogen phosphate is 30%～50%, and bentonite is 20%～30%, fluor-apatite is 20～30%, sodium chloride is 1%～10%;
Further preferably, by percentage to the quality, the consisting of of described soil stabilization medicament: phosphoric acidSodium dihydrogen is 40%～50%, and bentonite is 25%～30%, and fluor-apatite is 25～30%, chlorinationSodium is 5%～10%.
Method of the present invention, in the time adopting the combination of above-mentioned each optimum condition, to locating of lead-contaminated soilReason effect is better, that is: the drip washing stabilisation restorative procedure of processing lead-contaminated soil comprises the steps:
(1) be 4～6 times at 4～20 DEG C, pH, the soil that is 2:1～6:1 by mass ratioEarth eluent mixes with lead-contaminated soil, is uniformly mixed 30～45min, removes and washes leachate, must washSoil after pouring; Wherein with molar concentration meter, the consisting of of described Soil leaching agent: Na2-EDTA0.05mol/L～0.2mol/L, hydrochloric acid 0.01mol/L～0.05mol/L, citric acid 0.01mol/L～0.05mol/L, all the other components are water;
(2) soil is mixed afterwards with washing pouring for the soil stabilization medicament that is 1:20～1:30 by mass ratioClose, dispose 3～5 days; Wherein by percentage to the quality, consisting of of described soil stabilization medicament:Sodium dihydrogen phosphate is 40%～50%, and bentonite is 25%～30%, and fluor-apatite is 25～30%,Sodium chloride is 5%～10%.
In the present invention, find by lot of experiments, when Soil leaching agent and soil stabilization medicamentWhile getting following combination, the treatment effect the best to lead-contaminated soil:
With molar concentration meter, the consisting of of described Soil leaching agent: Na2-EDTA0.2mol/L, saltAcid 0.01mol/L, citric acid 0.01mol/L, all the other components are water;
By percentage to the quality, consisting of of described soil stabilization medicament: sodium dihydrogen phosphate is40%%, bentonite is 30%, and fluor-apatite is 25%, and sodium chloride is 5%.
Therefore, a kind of preferred technical scheme: the drip washing stabilisation reparation side that processes lead-contaminated soilThe most preferred scheme of method is:
(1) be 4～6 times at 4～20 DEG C, pH, the soil that is 2:1～6:1 by mass ratioEarth eluent mixes with lead-contaminated soil, is uniformly mixed 30～45min, removes and washes leachate, must washSoil after pouring; Wherein with molar concentration meter, the consisting of of described Soil leaching agent: with molar concentrationMeter, the consisting of of described Soil leaching agent: Na2-EDTA0.2mol/L, hydrochloric acid 0.01mol/L,Citric acid 0.01mol/L, all the other components are water;
(2) soil is mixed afterwards with washing pouring for the soil stabilization medicament that is 1:20～1:30 by mass ratioClose, dispose 3～5 days; By percentage to the quality, consisting of of described soil stabilization medicament: phosphoric acidSodium dihydrogen is 40%%, and bentonite is 30%, and fluor-apatite is 25%, and sodium chloride is 5%.
In the time that Soil leaching agent and soil stabilization medicament adopt above-mentioned optimum combination, then in conjunction with otherOptimum reaction condition, treatment effect further improves, and the processing time shortens.
That is: (1) is 4.2 times at 20 DEG C, pH, the Soil leaching agent that is 4:1 by mass ratio withLead-contaminated soil mixes, and is uniformly mixed 30min, removes and washes leachate, must wash the soil after pouring; ItsIn with molar concentration meter, the consisting of of described Soil leaching agent: Na2-EDTA0.2mol/L, hydrochloric acid0.01mol/L, citric acid 0.01mol/L, all the other components are water;
(2) the soil stabilization medicament that is 1:30 by mass ratio with wash drench after soil mix, locatePut 3 days; Wherein by percentage to the quality, consisting of of described soil stabilization medicament: biphosphateSodium is 40%, and bentonite is 30%, and fluor-apatite is 25, and sodium chloride is 5%.
In processing method of the present invention, utilize Na2-EDTA, citric acid to plumbous complexing by dirtThe lead extracting and enriching from solid phase dying in soil, to liquid phase, reaches the order that reduces the land pollutant in soilMark; Utilize under the condition that sodium dihydrogen phosphate exists at bentonite and fluor-apatite, can with soil inThe plumbous mineralising that occurs is reacted, and fully mixes with soil by stabilization agent, and lead can become from free stateThe mineral state of difficult ionization, thus within 3～5 day time, realized plumbous stabilisation; Utilize hydrochloric acid to leadPH in contaminated soil drip washing processing procedure controls, and ensures most of free state in course of reactionLead all can be transferred to liquid phase with lead ion enrichment, from soil, separate removal through drip washing filtrate; ProfitWith the bentonite in stabilization agent and sodium chloride composition, by being uniformly mixed in process and soilGrain fully mixes, and can further increase adsorption capacity and the ion-exchange capacity of soil particle, therebyAccelerate the process of whole contaminated soil stabilisation; Utilize the fluor-apatite composition in stabilization agent, logicalCross lead ion can with hydroxyapatite lattice in calcium ion generation ion-exchange reactions and enter lattice,Form leaded hydroxyapatite, and composite phosphate mineralising final and that lead phosphate formation is more stableThing.
The present invention simply will wash pouring technique to combine with stabilization process, in the inventive method,It is mutually collaborative that the chemistry of step (1) is washed between the stabilization processes in pouring and step (2), mutuallyPromote and mutually make up: the hydrochloric acid in chemical leaching and citric acid not only can strengthen Na2-EDTA is to plumbous complexing leaching, the thing such as humus, organic carbon in also can spoiled soilMatter, and these materials have certain inhibition for heavy metal stabilization process; After first drip washingAdopt the mode of stabilization agent processing, can further reduce the leachability of Lead In Soil, in additionBy adding part basic matterial in stabilization agent, can alleviate because of in drip washing processing procedurePH rises and the problem that causes plumbous leachability to improve.
The main lead-contaminated soil restorative procedure comparison of table 1.
| Processing method | Processing time | Treatment effeciency | Disposal cost | The scope of application |
| Dystopy soil removes method | Short | Disposable removal | High | Extensively |
| Curing/stabilizing method | In | In | Moderate | Narrow |
| Soil washing | In | Low | High | Narrow |
| Biological restoration | Long | Low | Cheap | Extensively |
| Drip washing stabilizing method | Short | High | Moderate | Extensively |
In table 1, compare of the present invention washing and drenched stabilization method and traditional lead-contaminated soil processing method,Compare with traditional control of Pb pollution restorative procedure, the present invention adopts drip washing stabilisation complex repairation sideMethod, according to the difference of the lead concentration in contaminated soil, adopts the technology road of first drip washing rear stabilization processingLine, can, by the mutual supplement with each other's advantages of two kinds of traditional treatment method, have significant superiority.
The present invention is according to the difference of the lead concentration in contaminated soil, adopts the processing of first drip washing rear stabilizationTechnology path, can, by the mutual supplement with each other's advantages of two kinds of traditional treatment method, have significant superiority. ItsMajor technique advantage comprises that the processing time is short, and treatment effeciency is high, for concentration of lead contamination lower thanThe contaminated soil of 1000mg/kg, the leaching concentration of Lead In Soil is lower than 1mg/L after treatment, soilIn residual lead base be originally converted into the mineral salt of lead phosphate class, can not cause secondary harm to environment.
Drip washing stabilisation restorative procedure of the present invention pollution lower than 1000mg/kg for concentration of lead contaminationSoil, the leaching concentration of Lead In Soil is lower than 1mg/L, with general solidification and stabilization side after treatmentMethod cannot effectively be processed lead concentration and exceed 500mg/kg and compare, and applicability and stability are all significantly carriedHeight, has obvious advantage.
Brief description of the drawings
Fig. 1 is the drip washing stabilisation restorative procedure flow chart that the present invention processes lead-contaminated soil.
Detailed description of the invention
Technological process of the present invention is as shown in Figure 1:
At 4～20 DEG C, the Soil leaching agent and the lead contamination that are 2:1～8:1 by mass ratioSoil mixes, and is uniformly mixed, and mixing time is 30～60min, and pH is 4～6, carries out soil and washes pouring.
At normal temperatures, by chemical leaching effect, the lead in contaminated soil is enriched in drip washing filtrate,Then the soil stabilization medicament that is 1:20～1:50 by mass ratio mixes with soil after drip washing,Through the disposal of 3～5 days, under normal temperature and pressure conditions, form stable phosphorus by physics chemical actionLead plumbate quasi-mineral.
After stabilization processes, process rear detection, the soil that meets relevant national standard is handledBecome, Quadratic Stability processing is carried out in against regulation returning.
Active ingredient consisting of with molar concentration meter: Na in Soil leaching agent2-EDTA0.05mol/L～0.2mol/L, hydrochloric acid 0.01mol/L～0.05mol/L, citric acid 0.01mol/L～0.05mol/L, all the other components are water.
Soil stabilization medicament consisting of by percentage to the quality: sodium dihydrogen phosphate is 30%～50%, bentonite is 20%～30%, and fluor-apatite is 20～30%, and sodium chloride is 5%～10%.
In lead-contaminated soil, lead concentration is 500～1000mg/kg.
Below in conjunction with instantiation, the invention will be further described.
Embodiment 1
Under 15 DEG C of temperature, be 300mg/kg by the Soil leaching agent of mass ratio 2:1 and lead concentrationContaminated soil mix, according to Na2-EDTA0.05mol/L, hydrochloric acid 0.01mol/L, citric acid0.01mol/L, all the other components are the concentration ratio preparation Soil leaching agent of water, are uniformly mixed, and stirTime is 30min, and after drip washing, soil pH actual measurement is 5.7.
Then the soil stabilization medicament that is 1:50 by mass ratio mixes with soil after drip washing, according toSodium dihydrogen phosphate is 50%, and bentonite is 25%, and fluor-apatite is 20%, the ratio that sodium chloride is 5%Example preparation soil stabilization medicament, through the disposal of 3 days, after processing according to U.S. EPA standard TCLPToxicity leaches sequence test the lead in soil is carried out to leaching concentration experiment, and after processing, sample leachate is denseDegree, for 0.53mg/L, meets completely in national standard and is less than 5mg/L for Lead In Soil Steep cencentrationRequirement.
Embodiment 2
Under 20 DEG C of temperature, be 600mg/kg by the Soil leaching agent of mass ratio 4:1 and lead concentrationContaminated soil mix, according to Na2-EDTA0.2mol/L, hydrochloric acid 0.01mol/L, citric acid0.01mol/L, all the other components are the concentration ratio preparation Soil leaching agent of water, are uniformly mixed, and stirTime is 30min, and after drip washing, soil pH actual measurement is 4.2.
Then the soil stabilization medicament that is 1:30 by mass ratio mixes with soil after drip washing, according toSodium dihydrogen phosphate is 40%, and bentonite is 30%, and fluor-apatite is 25%, the ratio that sodium chloride is 5%Example preparation soil stabilization medicament, through the disposal of 4 days, after processing according to U.S. EPA standard TCLPToxicity leaches sequence test the lead in soil is carried out to leaching concentration experiment, and after processing, sample leachate is denseDegree, for 0.83mg/L, meets completely in national standard and is less than 5mg/L for Lead In Soil Steep cencentrationRequirement.
Embodiment 3
Under 4 DEG C of temperature, be 800mg/kg by the Soil leaching agent of mass ratio 6:1 and lead concentrationContaminated soil mix, according to Na2-EDTA0.2mol/L, hydrochloric acid 0.05mol/L, citric acid0.05mol/L, all the other components are the concentration ratio preparation Soil leaching agent of water, are uniformly mixed, and stirTime is 30min, and after drip washing, soil pH actual measurement is 4.1.
Then the soil stabilization medicament that is 1:20 by mass ratio mixes with soil after drip washing, according toSodium dihydrogen phosphate is 45%, and bentonite is 26%, and fluor-apatite is 28%, the ratio that sodium chloride is 1%Example preparation soil stabilization medicament, through the disposal of 5 days, after processing according to U.S. EPA standard TCLPToxicity leaches sequence test the lead in soil is carried out to leaching concentration experiment, and after processing, sample leachate is denseDegree, for 0.92mg/L, meets completely in national standard and is less than 5mg/L for Lead In Soil Steep cencentrationRequirement.
Embodiment 4
Under 10 DEG C of temperature, be 800mg/kg by the Soil leaching agent of mass ratio 8:1 and lead concentrationContaminated soil mix, according to Na2-EDTA0.1mol/L, hydrochloric acid 0.03mol/L, citric acid0.03mol/L, all the other components are the concentration ratio preparation Soil leaching agent of water, are uniformly mixed, and stirTime is 45min, and after drip washing, soil pH actual measurement is 4.3.
Then the soil stabilization medicament that is 1:30 by mass ratio mixes with soil after drip washing, according toSodium dihydrogen phosphate is 44%, and bentonite is 28%, and fluor-apatite is 25%, the ratio that sodium chloride is 3%Example preparation soil stabilization medicament, through the disposal of 5 days, after processing according to U.S. EPA standard TCLPToxicity leaches sequence test the lead in soil is carried out to leaching concentration experiment, and after processing, sample leachate is denseDegree, for 0.94mg/L, meets completely in national standard and is less than 5mg/L for Lead In Soil Steep cencentrationRequirement.
Comparative example 1
Under 4 DEG C of temperature, be 800mg/kg by the Soil leaching agent of mass ratio 6:1 and lead concentrationContaminated soil mix, according to Na2-EDTA0.2mol/L, hydrochloric acid 0.05mol/L, citric acid0.05mol/L, all the other components are the concentration ratio preparation Soil leaching agent of water, are uniformly mixed, and stirTime is 30min, and after drip washing, soil pH actual measurement is 4.1.
Then soil after drip washing is being tested to stationary indoors after 5 days, according to U.S. EPA standard TCLPToxicity leaches sequence test the lead in soil is carried out to leaching concentration experiment, and after processing, sample leachate is denseDegree, for 28.8mg/L, cannot meet in national standard and be less than 5mg/L for Lead In Soil Steep cencentrationRequirement.
Comparative example 2
Under 4 DEG C of temperature, the soil stabilization medicament that mass ratio is 1:20 and lead concentration are 800The contaminated soil of mg/kg mixes, and is 45% according to sodium dihydrogen phosphate, and bentonite is 26%, fluorine phosphorus ashStone is 28%, the ratio preparation soil stabilization medicament that sodium chloride is 1%, and through the disposal of 5 days,After processing, leaching sequence test according to U.S. EPA standard TCLP toxicity leaches the lead in soilConcentration experiment, after processing, sample Steep cencentration is 3.6mg/L, although meet in national standard forLead In Soil Steep cencentration is less than the requirement of 5mg/L, but still higher than 0.92 in embodiment 3mg/L。
Claims (5)
1. a drip washing stabilisation restorative procedure of processing lead-contaminated soil, is characterized in that, comprisesFollowing steps:
(1) be 4～6 times at 4～20 DEG C, pH, Soil leaching agent mixed with lead-contaminated soil,Be uniformly mixed 30～60min, remove and wash leachate, must wash and drench rear soil; With molar concentration meter, instituteState consisting of of Soil leaching agent: Na2-EDTA0.05mol/L～0.2mol/L, hydrochloric acid 0.01Mol/L～0.05mol/L, citric acid 0.01mol/L～0.05mol/L, all the other components are water;
(2) by soil stabilization medicament with wash drench after soil mix, dispose 3～5 days; With quality hundredProportion by subtraction meter, the consisting of of described soil stabilization medicament: sodium dihydrogen phosphate is 30%～50%, swellingSoil is 20%～30%, and fluor-apatite is 20～30%, and sodium chloride is 1%～10%.
2. process according to claim 1 the drip washing stabilisation restorative procedure of lead-contaminated soil, itsBe characterised in that, the mass ratio of Soil leaching agent and lead-contaminated soil described in step (1) be 2:1～8：1。
3. process according to claim 2 the drip washing stabilisation restorative procedure of lead-contaminated soil, itsBe characterised in that, the mass ratio of Soil leaching agent and lead-contaminated soil described in step (1) be 2:1～6：1。
4. process according to claim 1 the drip washing stabilisation restorative procedure of lead-contaminated soil, itsBe characterised in that, soil stabilization medicament described in step (2) is 1 with the mass ratio of washing the rear soil of pouring:20～1：50。
5. process according to claim 4 the drip washing stabilisation restorative procedure of lead-contaminated soil, itsBe characterised in that, soil stabilization medicament described in step (2) is 1 with the mass ratio of washing the rear soil of pouring:20～1：30。
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| CN104249077B (en) * | 2014-10-10 | 2016-05-11 | 福建农林大学 | A kind of leaching repairing method of molybdenum polution soil |
| CN104475443B (en) * | 2014-11-17 | 2017-02-22 | 重庆理工大学 | Acid phosphate stabilization reparation method of lead contaminated soil |
| CN105289465B (en) * | 2015-12-08 | 2018-05-22 | 南京农业大学 | A kind of mineral renovation agent and its preparation method and application |
| CN105344706B (en) * | 2015-12-15 | 2018-05-18 | 四川大学 | For the curing agent and restorative procedure of lead-contaminated soil reparation |
| CN105728450B (en) * | 2016-05-05 | 2019-01-29 | 四川农业大学 | The method that nano material promotes low molecular organic acids removal Pb in Soil, zinc and cadmium |
| CN105969363A (en) * | 2016-05-18 | 2016-09-28 | 北京建筑材料科学研究总院有限公司 | Lead polluted soil immobilized medicament and preparation method thereof |
| CN109894467A (en) * | 2017-12-07 | 2019-06-18 | 国家电投集团远达环保工程有限公司重庆科技分公司 | The restorative procedure of lead-contaminated soil |
| CN112079341B (en) * | 2020-09-06 | 2023-04-04 | 桂林理工大学 | Preparation method and application of lead-calcium-fluorapatite solid solution |
| CN114958380A (en) * | 2021-03-01 | 2022-08-30 | 中国科学院大学 | Repairing agent for repairing lead-cadmium combined polluted soil and using method thereof |
| CN113058993B (en) * | 2021-04-08 | 2023-09-05 | 中铝环保节能集团有限公司 | Repairing agent for repairing lead, arsenic and cadmium combined polluted soil and repairing method thereof |
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| EP0888197A1 (en) * | 1996-03-21 | 1999-01-07 | Phytotech, Inc. | Method for hyperaccumulation of metals in plant shoots |
| CN101585045B (en) * | 2009-06-19 | 2011-04-27 | 华南农业大学 | Method for repairing heavy metal pollution soil by using chemical leaching and deep layer fixing combining technology |
| CN101708501B (en) * | 2009-12-02 | 2012-01-11 | 中国环境科学研究院 | Two-stage countercurrent washing medicament addition stabilization combined restoration method of chromium polluted soil |
| CN102965116B (en) * | 2012-11-14 | 2015-03-18 | 浙江省环境保护科学设计研究院 | Heavy metal stabilizing agent and method for treating heavy metal contaminated soil by using same |
| CN102962247B (en) * | 2012-11-26 | 2014-11-05 | 中国科学院南京土壤研究所 | Physico-chemical restoration method of copper-cadmium composite contaminated soil |
| CN103286123B (en) * | 2013-05-21 | 2014-07-30 | 江苏上田环境修复有限公司 | Process for treating heavy metal contaminated soil |
| CN103357655B (en) * | 2013-07-15 | 2016-01-20 | 南京农业大学 | A kind of composite chemical ELUTION METHOD for restoration of soil polluted by heavy metal |
| CN103599923B (en) * | 2013-11-29 | 2016-06-29 | 四川农业大学 | A kind of method utilizing nano zero valence iron plumbous with combined citric acid drip washing removal heavy-metal contaminated soil |
| CN103788956A (en) * | 2014-01-12 | 2014-05-14 | 北京化工大学 | Environment-friendly eluting agent and application method thereof |
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