CN105945053A - Novel contaminated site Pb in-situ detoxification method based on biogas residues - Google Patents

Novel contaminated site Pb in-situ detoxification method based on biogas residues Download PDF

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Publication number
CN105945053A
CN105945053A CN201610370390.0A CN201610370390A CN105945053A CN 105945053 A CN105945053 A CN 105945053A CN 201610370390 A CN201610370390 A CN 201610370390A CN 105945053 A CN105945053 A CN 105945053A
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China
Prior art keywords
sulfate
biogas residue
medicament
contaminated site
organic
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CN201610370390.0A
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Chinese (zh)
Inventor
张大磊
李瑞栋
王欣玉
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Qingdao University of Technology
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Qingdao University of Technology
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Priority to CN201610370390.0A priority Critical patent/CN105945053A/en
Publication of CN105945053A publication Critical patent/CN105945053A/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
    • B09C1/08Reclamation of contaminated soil chemically
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C1/00Reclamation of contaminated soil
    • B09C1/10Reclamation of contaminated soil microbiologically, biologically or by using enzymes

Abstract

The invention discloses a novel contaminated site Pb in-situ detoxification method based on biogas residues. The biogas residues, a carbon source and a sulfate are prepared into a medicament to be applied to Pb-containing soil; and then a special construction and curing mode is adopted to enable a fixed ecological microbial agent to gradually permeate underground so as to fix Pb in deep contaminated soil. The method can repair deeply-contaminatedPb-containing sites at low cost and with high efficiency, and treats wastes by using wastes to treat the biogas residues.

Description

A kind of novel contaminated site Pb situ detoxification method based on biogas residue
Technical field
The present invention provides a kind of method of novel process Pb contaminated soil; it is primarily directed to the soil that Pb pollution depth is higher; biogas residue, carbon source and sulfate are configured to medicament and are injected into containing in Pb soil in situ; use special maintenance method subsequently; Pb 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 Pb.Process the method containing Pb 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 Pb situ detoxification method based on biogas residue, biogas residue, carbon source and sulfate are configured to medicament and are injected into containing in Pb soil in situ, use special construction and maintenance method subsequently, make fixing ecological microbial agent gradually permeate the ground, deep layer polluted soil Pb is fixed.The place containing Pb that pollution depth is higher can be repaired by this method with low cost and efficiently, and biogas residue is processed by the treatment of wastes with processes of wastes against one another simultaneously.It comprises the steps of
(1) sodium sulfate, biogas residue or carbon source solution are mixed according to a certain percentage, after making mixing, solution dried biogas residues 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 Pb soil remediation medicament;
(2) being injected into the reparation medicament batch (-type) in step (1) containing in Pb soil, average every day, every square metre of injection rate was at 0-500L, 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 Pb, make full use of sulfate simultaneously, it is translated into sulfide, Pb simultaneously, is converted into more stable sulfuration Pb precipitation by the most fixing Pb.
Comparing traditional containing Pb agent, soil treatment method, this method has a following advantage:
1. the sulfate reducting bacteria sulphate reducing in biogas residue microbial inoculum, generates sulfide, can be while more efficient fixing Pb;
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 Pb, and does not results in ecological problem;
3.Pb and sulfate reducting bacteria metabolite sulfide form sulfuration Pb precipitation so that in soil, Pb is more stable, is significantly better than other biochemical process;
4. this method uses biogas residue 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, biogas residue or carbon source solution are mixed according to a certain percentage, after making mixing, solution dried biogas residues 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 Pb soil remediation medicament;
(2) being injected into the reparation medicament batch (-type) in step (1) containing in Pb soil, average every day, every square metre of injection rate was at 0-500L, 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 P in soil b content of deep layer are below 2mg/kg, and subsoil water amount containing Pb is less than 0.1mg/L.
Embodiment 2:
(1) sodium sulfate, biogas residue or carbon source solution are mixed according to a certain percentage, after making mixing, solution dried biogas residues 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 Pb soil remediation medicament;
(2) being injected into the reparation medicament batch (-type) in step (1) containing in Pb soil, average every day, every square metre of injection rate was at 0-500L, 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 P in soil b content of deep layer are below 2mg/kg, and subsoil water amount containing Pb 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 Pb situ detoxification method based on biogas residue, is characterized in that, comprise the steps of
(1) sodium sulfate, biogas residue or carbon source solution are mixed according to a certain percentage, after making mixing, solution dried biogas residues 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 Pb soil remediation medicament;
(2) being injected into the reparation medicament batch (-type) in step (1) containing in Pb soil, average every day, every square metre of injection rate was at 0-500L, 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 Pb situ detoxification method based on biogas residue, is characterized in that, described biogas residue be agricultural, grocery trade debirs carry out the solid residue in dry type, half dry type and wet type anaerobic fermentation process.
A kind of novel contaminated site Pb situ detoxification method based on biogas residue, 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 Pb situ detoxification method based on biogas residue, 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 Pb situ detoxification method based on biogas residue, 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 Pb situ detoxification method based on biogas residue, 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 Pb/ organic carbon: 1, and the mass ratio of sulfate (remembering with SO4)/organic carbon is for (0-1): 1.
CN201610370390.0A 2016-05-30 2016-05-30 Novel contaminated site Pb in-situ detoxification method based on biogas residues Pending CN105945053A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105950170A (en) * 2016-05-30 2016-09-21 青岛理工大学 Biogas residue based novel Cu in-situ detoxification method of contaminated site

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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105950170A (en) * 2016-05-30 2016-09-21 青岛理工大学 Biogas residue based novel Cu in-situ detoxification method of contaminated site

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Application publication date: 20160921