CN105935695A - Novel contaminated site Hg in-situ detoxifying method based on biogas residues - Google Patents

Novel contaminated site Hg in-situ detoxifying method based on biogas residues Download PDF

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Publication number
CN105935695A
CN105935695A CN201610370283.8A CN201610370283A CN105935695A CN 105935695 A CN105935695 A CN 105935695A CN 201610370283 A CN201610370283 A CN 201610370283A CN 105935695 A CN105935695 A CN 105935695A
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China
Prior art keywords
sulfate
biogas residue
medicament
contaminated site
situ
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Pending
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CN201610370283.8A
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Chinese (zh)
Inventor
张大磊
李健
孙箫
赵昱皓
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Qingdao University of Technology
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Qingdao University of Technology
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Priority to CN201610370283.8A priority Critical patent/CN105935695A/en
Publication of CN105935695A publication Critical patent/CN105935695A/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
    • B09C1/105Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C2101/00In situ

Abstract

The invention discloses a novel contaminated site Hg in-situ detoxifying method based on biogas residues. The biogas residues, a carbon source and sulfate are prepared into an agent to be injected into Hg-containing soil in situ, then, a special construction and maintenance manner is adopted, fixed ecological fungicide gradually seeps into the ground, and the deep layer contaminated soil Hg is fixed. According to the method, the Hg-containing site with the high pollution depth can be repaired with the low cost and high efficiency, meanwhile, waste is treated through waste, and the biogas residues are treated.

Description

A kind of novel contaminated site Hg situ detoxification method based on biogas residue
Technical field
The present invention provides a kind of method of novel process Hg contaminated soil; it is primarily directed to the soil that Hg pollution depth is higher; biogas residue, carbon source and sulfate are configured to medicament and are injected into containing in Hg soil in situ; use special maintenance method subsequently; Hg 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 Hg.Process the method containing Hg 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 Hg situ detoxification method based on biogas residue, biogas residue, carbon source and sulfate are configured to medicament and are injected into containing in Hg soil in situ, use special construction and maintenance method subsequently, make fixing ecological microbial agent gradually permeate the ground, deep layer polluted soil Hg is fixed.The place containing Hg 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 Hg soil remediation medicament;
(2) the reparation medicament in step (1) is forced through containing in Hg soil by injecting well, control pressure in 0-1Mpa scope, beyond then stopping injecting, average every day every square metre, pharmaceutical quantities was injected in 0-5 cubic meter scope in place, often within 1-100 days, it is repeatedly injected 1 time, is 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.
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 Hg, make full use of sulfate simultaneously, it is translated into sulfide, Hg simultaneously, is converted into more stable sulfuration Hg precipitation by the most fixing Hg.
Comparing traditional containing Hg 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 Hg;
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 Hg, and does not results in ecological problem;
3.Hg and sulfate reducting bacteria metabolite sulfide form sulfuration Hg precipitation so that in soil, Hg 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.
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 0.07:1, mixed solution reaction 3 days, it is thus achieved that Hg soil remediation medicament;
(2) the reparation medicament in step (1) is forced through containing in Hg soil by injecting well, control pressure in 0.2-0.5Mpa scope, beyond then stopping injecting, average every day, every square metre of place injection pharmaceutical quantities was separated by 3 days in 1-5 cubic meter, front 2 injections;Within the most every 10 days, injecting once, inject medicament and change carbon source and sulfate mixed liquor into, in mixed liquor, the mass ratio of sulfate (remembering with SO4)/organic carbon is as 0.1:1;After being continuously injected into 6 times, stop injecting;
(3) during repairing, the mode using surface sprinkling water in every 2-5 days carries out water and supplements, and enables medicament constantly to lower floor's seepage flow;After engineering construction 1 year, more than 40 meters soil Hg stripping quantities of deep layer are below 2mg/kg, and subsoil water amount containing Hg 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 10-20%, solid content 10-25%, organic carbon content 10-25%, the mass ratio of sulfate (remembering with SO4)/organic carbon is as 0.1:1, mixed solution reaction 3 days, it is thus achieved that Hg soil remediation medicament;
(2) the reparation medicament in step (1) is forced through containing in Hg soil by injecting well, control pressure in 0.2-0.5Mpa scope, beyond then stopping injecting, average every day every square metre, pharmaceutical quantities was injected at 1-5 cubic meter in place, front 2 injections are separated by 3 days, within the most every 10 days, inject once, after being continuously injected into 5 times, stop injecting;
(3) during repairing, the mode using surface sprinkling water in every 2-5 days carries out water and supplements, and enables medicament constantly to lower floor's seepage flow;After engineering construction 1 year, more than 40 meters soil Hg stripping quantities of deep layer are below 2mg/kg, and subsoil water amount containing Hg 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 Hg 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 Hg soil remediation medicament;
(2) the reparation medicament in step (1) is forced through containing in Hg soil by injecting well, control pressure in 0-1Mpa scope, beyond then stopping injecting, average every day every square metre, pharmaceutical quantities was injected in 0-5 cubic meter scope in place, often within 1-100 days, it is repeatedly injected 1 time, is 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 Hg 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 Hg 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 Hg 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 Hg 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 Hg 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, are then injected in place, and it is (0-1) that mixed liquid meets the mass ratio of Hg/ organic carbon: 1, the mass ratio of sulfate (remembering with SO4)/organic carbon is for (0-1): 1。
CN201610370283.8A 2016-05-30 2016-05-30 Novel contaminated site Hg in-situ detoxifying method based on biogas residues Pending CN105935695A (en)

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Cited By (3)

* 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
CN106583443A (en) * 2016-12-28 2017-04-26 青岛理工大学 Method capable of synchronously treating biogas residues and pesticide polluted soil
CN106623399A (en) * 2016-10-27 2017-05-10 北京市环境保护科学研究院 Method for restoring hexavalent chromium polluted soil through biogas slurry

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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
CN102500612A (en) * 2011-10-28 2012-06-20 中南大学 Chemical leaching restoring method for soil polluted by heavy metals
CN102598911A (en) * 2012-03-29 2012-07-25 常熟市佳盛农业科技发展有限公司 Method for remedying heavy metal polluted mining soil
CN103436265A (en) * 2013-08-23 2013-12-11 付融冰 Reductive degradable stabilizer of polluted soil, bottom mud and sludge as well as preparation method and using method of stabilizer
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
CN104312591A (en) * 2014-10-13 2015-01-28 贵州美瑞特环保科技有限公司 Stabilized curing agent for heavy metal contaminated soil or solid waste treatment and treatment method
CN104671624A (en) * 2015-02-10 2015-06-03 江苏金山环保科技股份有限公司 Processing method of low-cost heavy metal-containing sludge

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101791624A (en) * 2010-02-04 2010-08-04 中南大学 Method for utilizing and disposing micro-electrolyzed waste residue of organic waste water and method for immobilizing arsenic and heavy metal in soil
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
CN102500612A (en) * 2011-10-28 2012-06-20 中南大学 Chemical leaching restoring method for soil polluted by heavy metals
CN102598911A (en) * 2012-03-29 2012-07-25 常熟市佳盛农业科技发展有限公司 Method for remedying heavy metal polluted mining soil
CN103436265A (en) * 2013-08-23 2013-12-11 付融冰 Reductive degradable stabilizer of polluted soil, bottom mud and sludge as well as preparation method and using method of stabilizer
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
CN104312591A (en) * 2014-10-13 2015-01-28 贵州美瑞特环保科技有限公司 Stabilized curing agent for heavy metal contaminated soil or solid waste treatment and treatment method
CN104671624A (en) * 2015-02-10 2015-06-03 江苏金山环保科技股份有限公司 Processing method of low-cost heavy metal-containing sludge

Cited By (3)

* 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
CN106623399A (en) * 2016-10-27 2017-05-10 北京市环境保护科学研究院 Method for restoring hexavalent chromium polluted soil through biogas slurry
CN106583443A (en) * 2016-12-28 2017-04-26 青岛理工大学 Method capable of synchronously treating biogas residues and pesticide polluted soil

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Application publication date: 20160914