CN106433653A - Composite eluting agent for restoring Cd and Pb contaminated soil and application method thereof - Google Patents

Composite eluting agent for restoring Cd and Pb contaminated soil and application method thereof Download PDF

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Publication number
CN106433653A
CN106433653A CN201610841776.5A CN201610841776A CN106433653A CN 106433653 A CN106433653 A CN 106433653A CN 201610841776 A CN201610841776 A CN 201610841776A CN 106433653 A CN106433653 A CN 106433653A
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CN
China
Prior art keywords
eluent
soil
acid
compound
contaminated soil
Prior art date
Application number
CN201610841776.5A
Other languages
Chinese (zh)
Inventor
周建强
韩君
徐愿坚
杨立鹏
周敏
高涛
陈卫文
何玉龙
张如意
王蕾
凡祖伟
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北京新源环境有限公司
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Application filed by 北京新源环境有限公司 filed Critical 北京新源环境有限公司
Priority to CN201610841776.5A priority Critical patent/CN106433653A/en
Publication of CN106433653A publication Critical patent/CN106433653A/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C1/00Reclamation of contaminated soil
    • B09C1/02Extraction using liquids, e.g. washing, leaching, flotation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C1/00Reclamation of contaminated soil
    • B09C1/08Reclamation of contaminated soil chemically
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K17/00Soil-conditioning materials or soil-stabilising materials
    • C09K17/14Soil-conditioning materials or soil-stabilising materials containing organic compounds only
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2101/00Agricultural use

Abstract

A composite eluting agent for restoring Cd and Pb contaminated soil and an application method thereof belong to the technical field of soil restoration. The eluting agent is prepared mainly from EDTA (ethylenediaminetetraacetic acid) and an organic acid, wherein the organic acid is from one or any of oxalic acid, lactic acid, citric acid, humic acid, and fulvic acid. The application method of the composite eluting agent comprises the steps of (1) subjecting contaminated soil to simple crushing, and screening to remove large foreign matters and stone; (2) adding an eluting agent to the contaminated soil, keeping soil-water ratio to 1:5 to 1:10, and stirring with the soil for 2-4 h; (3) after solid-liquid separation, treating the eluting agent for recycling, adding the composite eluting agent to the contaminated soil, and stirring again for 3-6 h; (4), carrying out solid-liquid separation, and adding tap water for cleaning and eluting to obtain clean soil. By means of multi-step elution and using composite eluting agents different in concentrations, it is possible to effectively reduce Cd and Pb in soil; the method is a truly practical and economically practical eluting method.

Description

A kind of compound eluent for repairing Cd, Pb contaminated soil and its using method
Technology neighborhood
The invention belongs to contaminated soil remediation technical field is and in particular to the eluent in chemical leaching reparation is prepared and made Use method.
Background technology
Because the pollution that economical activities of mankind produces is continuously increased, many pollution of soil areas are continuous in the world at present Expand, The Heavy Metal Contaminated Soil problem shows especially prominent.Irrigated farmland containing heavy metal containing sewage, the agricultural use of mud, The administration of fertilizer and pesticide and the sedimentation of mining area floating dust, have made tellurian many soil or will be contaminated by heavy metals.Soil Earth heavy metal pollution can lead to serious direct economic loss, so that food quality is constantly declined, be detrimental to health, also can lead Cause other environmental problems.The research of heavy metal pollution of soil and its administering method has become as extremely urgent problem.
The improvement of heavy metal pollution of soil and repair that to be broadly divided into physics, chemistry, biology, agricultural etc. by its principle several big Class method.Wherein, chemical leaching method have that applied widely, Method means are many, the big, effect is significant of instant effect, process capacity etc. Feature, has preferable actual application prospect.
The key of chemical leaching is to find effective eluent, says leacheate preferably directly using clear water from environmental angle, But this method elution efficiency is not high, for improving the elution efficiency of leacheate, lessivation can add chemical reagent, surface-active Agent, ionic complexing agent etc..As a kind of chelating agent, its mechanism of action is exactly to first pass through chelation to EDTA, will adsorb in soil Earth particle and colloid surface heavy metal ion decomplexing are got off, and then recycle itself strong chelation and heavy metal ion to be formed Strong chela body, separates from soil.The present invention is to be combined using chelating agent EDTA and organic acid, prepares a kind of new height The chemical leaching of effect, removes Heavy Metals in Soil Contaminated for quick, simultaneously the invention provides the making of a kind of compound eluent Use method.
Content of the invention
Invention broadly provides a kind of compound eluent for repairing Cd, Pb contaminated soil and its using method, should Eluent is mainly made up of two parts, i.e. EDTA and organic acid.Provide the using method of this eluent simultaneously, be conducive to playing The maximum efficiency of eluent.Main inclusion herein below:
A kind of compound eluent for repairing Cd, Pb contaminated soil is it is characterised in that described eluent is mainly by two It is grouped into i.e. EDTA and organic acid, wherein organic acid is selected from one of oxalic acid, lactic acid, citric acid, humic acid, fulvic acid or several Kind, the eluent of the present invention is compounded by this two parts and forms.In compound eluent, the concentration of EDTA is 0.03 0.1mol/L, has Machine acid concentration is 0.1 0.3mol/L.
A kind of application process of the compound eluent for repairing Cd, Pb contaminated soil is it is characterised in that include following walking Suddenly:
(1) pretreatment of soil, contaminated soil is simply crushed, and sieves, removes debris and stone etc., after convenience Continuous chemical leaching reparation;
(2) in contaminated soil, add eluent, eluent is compound eluent and the water group with compound eluent same volume Become, keep soil and water quality ratio for 1:5—1:10, soil and water quality than in water be compound eluent and water gross mass, mixing is all 2-4h is stirred together with soil after even;
(3), after separation of solid and liquid, through processing recoverable, after separation of solid and liquid, contaminated soil adds compound drip washing to leacheate Agent is again stirring for 3-6h;
(4) after separation of solid and liquid, add running water cleaning drip washing, the leacheate of discharge recycles after water process, Cleaning soil can directly backfill.
A kind of application process of described compound eluent for repairing Cd, Pb contaminated soil is it is characterised in that step (1) in, the purpose of soil pretreatment is mainly chosen does not need to process and interference material, improves the efficiency of chemical leaching.
A kind of application process of described compound eluent for repairing Cd, Pb contaminated soil is it is characterised in that step (2) in, eluent used is the aqueous solution that compound eluent adds same volume, and that is, mixing eluent is the compound drip washing of 1/2 concentration Agent.
A kind of application process of described compound eluent for repairing Cd, Pb contaminated soil is it is characterised in that step (3) in, eluent is compound eluent, step (2) and step (3) lessivation, and first being removed using the eluent of low concentration can The heavy metal of dissolubility, then change the form of heavy metal-polluted soil with the eluent of higher concentration, make to be changed into reference to the heavy metal of state The metal of dissolvable state, thus improve the effect of chemical leaching.
A kind of application process of described compound eluent for repairing Cd, Pb contaminated soil is it is characterised in that step (4) adopt after multiple drip washing in and use water as eluent, be cleaned drip washing, reduce the residual of eluent in soil, enter simultaneously One step woods washes the heavy metal ion of upper soll layer absorption off.Drip washing terminate after leacheate through separation of solid and liquid, using physical chemistry Method the heavy metal in eluent is reclaimed, eluent recycling.
A kind of application process of the compound eluent for repairing Cd, Pb contaminated soil of the present invention is it is characterised in that chemistry Tu Shui ratio is kept for 1 in lessivation:5—1:10, can more efficiently play the drip washing effect of eluent.
A kind of eluent of restoration of soil polluted by heavy metal disclosed by the invention and its application process, can promote gold in soil The dissolving of genus, complexing, dissociation, wherein EDTA primarily serves the effect of complexing heavy metal, and organic acid can reduce the soil liquid PH value, can be complexed simultaneously and dissolve heavy metal ion, and the two promotes heavy metal ion to be dissolved among eluent jointly, thus Heavy metal ion is removed among soil.Each component of this eluent all can not resulted in soil by soil microbial degradation Secondary pollution, simultaneously this eluent use raw material more universal, be readily available, configuration process is simple and convenient, have preferably Economic benefit.
Specific implementation method
With reference to embodiment, the invention will be further described, but the present invention is not limited to following examples.
Embodiment 1
Weigh 5.00g heavy metal contaminated soil containing Cd and Pb, wherein the concentration of Cd and Pb be respectively 18.6mg/kg, 549.6mg/kg.Soil, using through pretreatment, picking out branch, stone etc. before, crosses 100 mesh sieves standby after grinding.Drip washing Agent is EDTA and citric acid solution, and the concentration of EDTA and citric acid is respectively 0.05mol/L, 0.1mol/L;Add the drip washing of 1+1 (Tu Shui is than for 1 for agent 40ml:8) with the centrifuge tube of 100ml in, be placed in 250r/min concussion 3h in shaking table under room temperature, 3000 turns/ Min is centrifuged 20 minutes, abandoning supernatant after separation of solid and liquid.Residual soil continues plus 40ml leacheate (stoste) concussion 5h, and 3000 Turn/min be centrifuged 20 minutes, abandoning supernatant after separation of solid and liquid.Residual soil can get clean after water cleaning concussion Soil.The soil after drip washing is taken to measure remaining Cd and Pb content in soil, in soil after obtaining drip washing, Cd and Pb concentration is respectively 1.38mg/kg, 108.3mg/kg, scrubbed after soil Cd and Pb reduced rate be respectively 92.6%, 80.3%.
Embodiment 2
Test carries out chemical leaching reparation using the mixing eluent of EDTA and humic acid to Cd and Pb contaminated soil, mixes The concentration closing EDTA and humic acid in eluent is respectively 0.03mol/L, 0.2mol/L, and the solid-to-liquid ratio of Non-leaching process is 1: 10, the concussion time is 3h, abandoning supernatant after separation of solid and liquid, and residual soil can get clean after water cleaning concussion Soil.Before and after drip washing, the change of heavy metal-polluted soil Cd and Pb content is as shown in the table.
As seen from the experiment, after the mixing eluent drip washing of EDTA and humic acid, the reduced rate of soil Cd is 87.1%th, 84.3%;The reduced rate of P in soil b is 68.5%, 71.9%.Scrubbed rear heavy metal content in soil has very great Cheng The reduction of degree.

Claims (8)

1. a kind of compound eluent for repairing Cd, Pb contaminated soil is it is characterised in that described eluent is mainly by two parts Composition is EDTA and organic acid, and in compound eluent, the concentration of EDTA is 0.03 0.1mol/L, and organic acid concentration is 0.1 0.3mol/L.
2. according to a kind of compound eluent for repairing Cd, Pb contaminated soil described in claim 1 it is characterised in that having Machine acid is selected from one or more of oxalic acid, lactic acid, citric acid, humic acid, fulvic acid.
3. the compound eluent for repairing Cd, Pb contaminated soil described in claim 1 using method it is characterised in that Comprise the steps:
(1) pretreatment of soil, contaminated soil is simply crushed, and sieves, removes debris and stone etc., facilitates follow-up Chemical leaching is repaired;
(2) in contaminated soil, add eluent, eluent is compound eluent and the water with compound eluent same volume forms, Keep soil and water quality ratio for 1:5—1:10, soil and water quality than in water be compound eluent and water gross mass, after mixing Stir 2-4h with soil together;
(3), after separation of solid and liquid, through processing recoverable, contaminated soil adds eluent in step (2) to stir again to leacheate Mix 3-6h;
(4) after separation of solid and liquid, add running water cleaning drip washing, the leacheate of discharge recycles after water process, cleaning Soil can directly backfill.
4. according to claim 3 method it is characterised in that in step (1) purpose of soil pretreatment mainly choose and be not required to Process and interference material, improve the efficiency of chemical leaching.
5. according to claim 3 method it is characterised in that in step (2) eluent used be that compound eluent adds same volume The aqueous solution, that is, mixing eluent be 1/2 concentration compound eluent.
6. according to claim 3 method it is characterised in that in step (3) eluent be compound eluent, step (2) and step Suddenly (3) lessivation, first removes soluble heavy metal using the eluent of low concentration, then is changed with the eluent of higher concentration Becoming the form of heavy metal-polluted soil, making to be changed into the metal of dissolvable state with reference to the heavy metal of state, thus improving the effect of chemical leaching Really.
7. using water as eluent according to the method for claim 3 it is characterised in that adopting after multiple drip washing in step (4), entering Row cleaning drip washing, reduces the residual of eluent in soil, woods washes the heavy metal ion of upper soll layer absorption off further simultaneously.
8. according to claim 3 method it is characterised in that drip washing terminate after leacheate through separation of solid and liquid, using physico Heavy metal in eluent is reclaimed by the method learned, eluent recycling.
CN201610841776.5A 2016-09-22 2016-09-22 Composite eluting agent for restoring Cd and Pb contaminated soil and application method thereof CN106433653A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106984639A (en) * 2017-04-11 2017-07-28 东南大学 It is a kind of to carry out ELUTION METHOD for the eluent of repairing polluted soil and using it
CN107159701A (en) * 2017-07-06 2017-09-15 广西博世科环保科技股份有限公司 It is a kind of at the same remove soil in arsenic antimony method
CN107312544A (en) * 2017-06-30 2017-11-03 中国地质大学(武汉) The compounding eluent and its application method of a kind of heavy-metal composite pollution soil remediation
CN108160698A (en) * 2018-01-08 2018-06-15 初梅 Liquid and preparation method thereof is repaired in a kind of heavy-metal contaminated soil elution of environment-friendly high-efficiency
CN108517212A (en) * 2018-02-02 2018-09-11 吴洪生 A kind of soil heavy metal combined pollution eluant, eluent production method and application
CN108579669A (en) * 2018-04-24 2018-09-28 太原科技大学 For the regenerated regenerative agent of heavy-metal contaminated soil ring waste and preparation method and application
CN108795438A (en) * 2018-05-02 2018-11-13 杨大伟 A kind of preparation and application of heavy metal-polluted soil leacheate
CN108941177A (en) * 2018-09-10 2018-12-07 江西夏氏春秋环境股份有限公司 It is a kind of for repairing the eluent and its application method of Cu, Pb, As combined contamination soil
CN109967513A (en) * 2019-03-25 2019-07-05 华中农业大学 A kind of ELUTION METHOD for repairing cationic and anionic Compound Heavy Metals soil
CN110305668A (en) * 2019-04-11 2019-10-08 苏州市宏宇环境科技股份有限公司 Heavy metals in paddy soils eluent and preparation method thereof

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101362146A (en) * 2008-09-12 2009-02-11 中山大学 Chemical leaching repairing method for removing heavy metal and arsenic from soil
CN101585045A (en) * 2009-06-19 2009-11-25 华南农业大学 Method for repairing heavy metal pollution soil by using chemical leaching and deep layer fixing combining technology
CN103785681A (en) * 2014-02-18 2014-05-14 江苏江达市政园林建设有限公司 Method for efficiently remedying heavy metal ion contamination in soil
CN104772329A (en) * 2015-04-07 2015-07-15 清华大学 Method for leaching heavy metal contaminated soil by ultrasonic strengthening organic acid
CN104858225A (en) * 2015-06-03 2015-08-26 江苏省环境科学研究院 Device and method for washing and electrokinetic-combined remediation of heavy metal contaminated soil
CN105149334A (en) * 2015-10-12 2015-12-16 山东师范大学 Oxidation-chelation leaching combined remediation method for Cr-contaminated soil
CN105855283A (en) * 2016-06-15 2016-08-17 中科院广州化灌工程有限公司 Treatment method for heavy metal contaminated soil

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101362146A (en) * 2008-09-12 2009-02-11 中山大学 Chemical leaching repairing method for removing heavy metal and arsenic from soil
CN101585045A (en) * 2009-06-19 2009-11-25 华南农业大学 Method for repairing heavy metal pollution soil by using chemical leaching and deep layer fixing combining technology
CN103785681A (en) * 2014-02-18 2014-05-14 江苏江达市政园林建设有限公司 Method for efficiently remedying heavy metal ion contamination in soil
CN104772329A (en) * 2015-04-07 2015-07-15 清华大学 Method for leaching heavy metal contaminated soil by ultrasonic strengthening organic acid
CN104858225A (en) * 2015-06-03 2015-08-26 江苏省环境科学研究院 Device and method for washing and electrokinetic-combined remediation of heavy metal contaminated soil
CN105149334A (en) * 2015-10-12 2015-12-16 山东师范大学 Oxidation-chelation leaching combined remediation method for Cr-contaminated soil
CN105855283A (en) * 2016-06-15 2016-08-17 中科院广州化灌工程有限公司 Treatment method for heavy metal contaminated soil

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106984639A (en) * 2017-04-11 2017-07-28 东南大学 It is a kind of to carry out ELUTION METHOD for the eluent of repairing polluted soil and using it
CN107312544A (en) * 2017-06-30 2017-11-03 中国地质大学(武汉) The compounding eluent and its application method of a kind of heavy-metal composite pollution soil remediation
CN107159701A (en) * 2017-07-06 2017-09-15 广西博世科环保科技股份有限公司 It is a kind of at the same remove soil in arsenic antimony method
CN108160698A (en) * 2018-01-08 2018-06-15 初梅 Liquid and preparation method thereof is repaired in a kind of heavy-metal contaminated soil elution of environment-friendly high-efficiency
CN108517212A (en) * 2018-02-02 2018-09-11 吴洪生 A kind of soil heavy metal combined pollution eluant, eluent production method and application
CN108579669A (en) * 2018-04-24 2018-09-28 太原科技大学 For the regenerated regenerative agent of heavy-metal contaminated soil ring waste and preparation method and application
CN108795438A (en) * 2018-05-02 2018-11-13 杨大伟 A kind of preparation and application of heavy metal-polluted soil leacheate
CN108941177A (en) * 2018-09-10 2018-12-07 江西夏氏春秋环境股份有限公司 It is a kind of for repairing the eluent and its application method of Cu, Pb, As combined contamination soil
CN109967513A (en) * 2019-03-25 2019-07-05 华中农业大学 A kind of ELUTION METHOD for repairing cationic and anionic Compound Heavy Metals soil
CN110305668A (en) * 2019-04-11 2019-10-08 苏州市宏宇环境科技股份有限公司 Heavy metals in paddy soils eluent and preparation method thereof
CN110305668B (en) * 2019-04-11 2021-02-26 苏州市宏宇环境科技股份有限公司 Rice soil heavy metal eluting agent and preparation method thereof

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Application publication date: 20170222