CN105935691A - Novel contaminated site Cd in-situ detoxication method - Google Patents

Novel contaminated site Cd in-situ detoxication method Download PDF

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Publication number
CN105935691A
CN105935691A CN201610370368.6A CN201610370368A CN105935691A CN 105935691 A CN105935691 A CN 105935691A CN 201610370368 A CN201610370368 A CN 201610370368A CN 105935691 A CN105935691 A CN 105935691A
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China
Prior art keywords
sulfate
situ
contaminated site
medicament
organic
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Pending
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CN201610370368.6A
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Chinese (zh)
Inventor
张大磊
张恬
李瑞栋
王欣玉
尹炳奎
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Qingdao University of Technology
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Qingdao University of Technology
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Priority to CN201610370368.6A priority Critical patent/CN105935691A/en
Publication of CN105935691A publication Critical patent/CN105935691A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C1/00Reclamation of contaminated soil
    • B09C1/08Reclamation 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
    • C09K17/40Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds

Abstract

The invention provides a novel contaminated site Cd in-situ detoxication method. The novel contaminated site Cd in-situ detoxication method includes the steps that sludge, a carbon source and sulfate are prepared into a chemical agent to be injected into soil containing Cd in an in-situ manner, then a special construction and curing manner is adopted, a fixing ecological bacteriostatic agent is made to seep into the ground gradually, and Cd in the deep contaminated soil is fixed. By the adoption of the novel contaminated site Cd in-situ detoxication method, the site which contains Cd and is high in contamination degree can be efficiently restored with low cost; and meanwhile wastes are treated with wastes, and the sludge is treated.

Description

A kind of novel contaminated site Cd situ detoxification method
Technical field
The present invention provides a kind of method of novel process Cd contaminated soil; it is primarily directed to the soil that Cd pollution depth is higher; mud, carbon source and sulfate are configured to medicament and are injected into containing in Cd soil in situ; use special maintenance method subsequently; Cd can be fixed efficiently; the most cost-effective, belong to field of environment protection.
Background technology
Owing to mining, Metallurgical Waste Water arbitrarily discharge, cause a large amount of soil and polluted by Cd.Process the method containing Cd soil at present the most defective.High-temperature melting method cost is high, and power consumption is big.Bioanalysis is long for reaction time, and easily causes the secondary pollution of adventive microbial inoculum.Solidification method effect is unstable, and soil is easily caused secondary pollution by firming agent.The patent No. 201510056406.6 describes a kind of curing containing heavy metal soil, but the method using substantial amounts of material, relatively costly, on the other hand solidification effect is unstable, the most easily there is carbonation in the calcium oxide as added so that alkaline-curing effect reduces.
Summary of the invention
For the deficiencies in the prior art, the present invention uses a kind of novel contaminated site Cd situ detoxification method, mud, carbon source and sulfate are configured to medicament and are injected into containing in Cd soil in situ, use special construction and maintenance method subsequently, make fixing ecological microbial agent gradually permeate the ground, deep layer polluted soil Cd is fixed.The place containing Cd that pollution depth is higher can be repaired by this method with low cost and efficiently, and mud is processed by the treatment of wastes with processes of wastes against one another simultaneously.It comprises the steps of
(1) sodium sulfate, mud or carbon source solution are mixed according to a certain percentage, after making mixing, solution dewatered sludge content is 0.1-20%, solid content 0.5-25%, organic carbon content 0.5-25%, the mass ratio of sulfate (remembering with SO4)/organic carbon is for (0-1): 1, mixed solution reaction 0-5 days, it is thus achieved that Cd soil remediation medicament;
(2) being forced through the reparation medicament batch (-type) in step (1) containing in Cd soil, injection pressure is at 0.1-1Mpa, and average every day, every square metre of injection rate was at 0-50 cube, was continued until that reparation terminates, during can constantly extract subsoil water;
(3) during repairing, it is desirable to the annual average rainfall in place is at more than 200mm, not enough then use the mode of surface sprinkling water to supplement, and enables medicament continuous to lower floor's seepage flow.
This method injects additional special field construction and maintenance in situ by special ecological medicament, place is promoted to form the flora based on sulfate reducting bacteria on a large scale, first this flora can utilize carbon source effectively to fix Cd, make full use of sulfate simultaneously, it is translated into sulfide, Cd simultaneously, is converted into more stable sulfuration Cd precipitation by the most fixing Cd.
Comparing traditional containing Cd agent, soil treatment method, this method has a following advantage:
1. the sulfate reducting bacteria sulphate reducing in sludge microbial agent, generates sulfide, can be while more efficient fixing Cd;
2. the sulfate reduction flora cultivated itself is indigenous flora, and natural tolerance is strong, easily multiplies on a large scale in place, can the most effectively fix Cd, and does not results in ecological problem;
3.Cd and sulfate reducting bacteria metabolite sulfide form sulfuration Cd precipitation so that in soil, Cd is more stable, is significantly better than other biochemical process;
4. this method uses mud and debirs as primary raw material, greatly reduces cost;
5. this method uses in-situ immobilization to deep soil, it is to avoid the excavation of deep soil, greatly reduces cost.
It is embodied as example as follows:
Embodiment 1:
(1) sodium sulfate, mud or carbon source solution are mixed according to a certain percentage, after making mixing, solution dewatered sludge content is 0.1-5%, solid content 0.5-5%, organic carbon content 0.5-5%, the mass ratio of sulfate (remembering with SO4)/organic carbon is as 0.1:1, mixed solution reaction 1 day, it is thus achieved that Cd soil remediation medicament;
(2) being forced through the reparation medicament batch (-type) in step (1) containing in Cd soil, injection pressure is at 0.1-0.5Mpa, and average every day, every square metre of injection rate was at 30-50 cube, was continued until that reparation terminates;
(3) during repairing, it is desirable to the annual average rainfall in place is at more than 200mm, not enough then use the mode of surface sprinkling water to supplement, and enables medicament continuous to lower floor's seepage flow;After engineering construction 2 years, more than 20 meters soil Cd content of deep layer are below 2mg/kg, and subsoil water amount containing Cd is less than 0.1mg/L.
Embodiment 2:
(1) sodium sulfate, mud or carbon source solution are mixed according to a certain percentage, after making mixing, solution dewatered sludge content is 5-20%, solid content 5-25%, organic carbon content 5-25%, the mass ratio of sulfate (remembering with SO4)/organic carbon is as 0.5:1, mixed solution reaction 2 days, it is thus achieved that Cd soil remediation medicament;
(2) being forced through the reparation medicament batch (-type) in step (1) containing in Cd soil, injection pressure is at 0.5-0.8Mpa, and average every day, every square metre of injection rate was at 20-30 cube, was continued until that reparation terminates;
(3) during repairing, it is desirable to the annual average rainfall in place is at more than 200mm, not enough then use the mode of surface sprinkling water to supplement, and enables medicament continuous to lower floor's seepage flow;After engineering construction 1 year, more than 40 meters soil Cd content of deep layer are below 2mg/kg, and subsoil water amount containing Cd is less than 0.1mg/L.
Above example is only in order to illustrate technical scheme, rather than is limited;Although the present invention being described in detail with reference to previous embodiment, for the person of ordinary skill of the art, still the technical scheme described in previous embodiment can be modified, or wherein portion of techniques feature is carried out equivalent;And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of claimed technical solution of the invention.

Claims (6)

1. a novel contaminated site Cd situ detoxification method, is characterized in that, comprise the steps of
(1) sodium sulfate, mud or carbon source solution are mixed according to a certain percentage, after making mixing, solution dewatered sludge content is 0.1-20%, solid content 0.5-25%, organic carbon content 0.5-25%, the mass ratio of sulfate (remembering with SO4)/organic carbon is for (0-1): 1, mixed solution reaction 0-5 days, it is thus achieved that Cd soil remediation medicament;
(2) being forced through the reparation medicament batch (-type) in step (1) containing in Cd soil, injection pressure is at 0.1-1Mpa, and average every day, every square metre of injection rate was at 0-50 cube, was continued until that reparation terminates;
(3) during repairing, it is desirable to the annual average rainfall in place is at more than 200mm, not enough then use the mode of surface sprinkling water to supplement, and enables medicament continuous to lower floor's seepage flow.
A kind of novel contaminated site Cd situ detoxification method the most as claimed in claim 1, is characterized in that, described mud is anaerobic sludge produced by sewage treatment anaerobic technique, it is possible to the double oxygen mud of admixture part.
A kind of novel contaminated site Cd situ detoxification method the most as claimed in claim 1, it is characterized in that, described carbon source solution can be containing organic solution such as ethanol, saccharide, protein, starch, can also be for the solution containing the industry organic solid waste such as organic waste, changing food waste, can also be industrial and municipal organic wastewater, described sodium sulfate can be substituted by the material of other containing sulfate.
A kind of novel contaminated site Cd situ detoxification method the most as claimed in claim 1, is characterized in that, constantly extracts subsoil water when of injecting medicament, forms negative pressure, makes medicament easily flow into underground.
A kind of novel contaminated site Cd situ detoxification method the most as claimed in claim 1, it is characterized in that, during reparation, the reparation medicament injecting place can be substituted by carbon source and sulfate mixed liquor, and in mixed liquor, the mass ratio of sulfate (remembering with SO4)/organic carbon is for (0-1): 1.
A kind of novel contaminated site Cd situ detoxification method the most as claimed in claim 4, it is characterized in that, carbon source and sulfate mixed liquor can add the subsoil water of place extracting, it is then injected in place, it is (0-1) that mixed liquid meets the mass ratio of Cd/ organic carbon: 1, and the mass ratio of sulfate (remembering with SO4)/organic carbon is for (0-1): 1.
CN201610370368.6A 2016-05-30 2016-05-30 Novel contaminated site Cd in-situ detoxication method Pending CN105935691A (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107138521A (en) * 2017-05-08 2017-09-08 北京航空航天大学 A kind of repairing method of microorganism of cadmium pollution bed mud
CN112940730A (en) * 2021-01-15 2021-06-11 华北地质勘查局五一四地质大队 Agent for repairing contaminated soil of mine heavy metal tailing pond and using method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101412037A (en) * 2008-09-02 2009-04-22 夏钟文 Method for optimizing soil using sludge after physical and chemical treatment
CN102059247A (en) * 2010-11-29 2011-05-18 中国科学院地理科学与资源研究所 Vehicle-mounted repairing equipment and method for polluted site soil and underground water body
CN103981097A (en) * 2013-12-05 2014-08-13 青岛理工大学 Preparation method of remediation flora for Cr (VI) contaminated site from sludge
CN104624636A (en) * 2014-12-30 2015-05-20 天津市工业微生物研究所有限公司 Preparation method and using method of novel biological soil remediation agent
CN105149337A (en) * 2015-09-30 2015-12-16 湖南艾布鲁环保科技有限公司 Method for remediating cadmium contaminated arable soil

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101412037A (en) * 2008-09-02 2009-04-22 夏钟文 Method for optimizing soil using sludge after physical and chemical treatment
CN102059247A (en) * 2010-11-29 2011-05-18 中国科学院地理科学与资源研究所 Vehicle-mounted repairing equipment and method for polluted site soil and underground water body
CN103981097A (en) * 2013-12-05 2014-08-13 青岛理工大学 Preparation method of remediation flora for Cr (VI) contaminated site from sludge
CN104624636A (en) * 2014-12-30 2015-05-20 天津市工业微生物研究所有限公司 Preparation method and using method of novel biological soil remediation agent
CN105149337A (en) * 2015-09-30 2015-12-16 湖南艾布鲁环保科技有限公司 Method for remediating cadmium contaminated arable soil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107138521A (en) * 2017-05-08 2017-09-08 北京航空航天大学 A kind of repairing method of microorganism of cadmium pollution bed mud
CN112940730A (en) * 2021-01-15 2021-06-11 华北地质勘查局五一四地质大队 Agent for repairing contaminated soil of mine heavy metal tailing pond and using method

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