CN105945064A - Novel contaminated soil hexavalent chromium detoxification method based on biogas residues - Google Patents
Novel contaminated soil hexavalent chromium detoxification method based on biogas residues Download PDFInfo
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- CN105945064A CN105945064A CN201610370403.4A CN201610370403A CN105945064A CN 105945064 A CN105945064 A CN 105945064A CN 201610370403 A CN201610370403 A CN 201610370403A CN 105945064 A CN105945064 A CN 105945064A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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Abstract
The invention discloses a novel method for treating Cr(VI) contaminated soil. Biogas residues, a carbon source and ferrous sulfate are prepared into a medicament to be applied to chromium-containing soil; and then a special curing mode is adopted. The method can reduce hexavalent chromium at low cost and at high efficiency, and prevents secondary pollution of the sulfate and the biogas residues.
Description
Technical field
The present invention provides a kind of method of novel process Cr (VI) contaminated soil; biogas residue, carbon source and ferrous sulfate are configured to pharmacy application in containing in chromium soil; use special maintenance method subsequently; can reduction of hexavalent chromium efficiently; avoid the secondary pollution of sulfate simultaneously, belong to field of environment protection.
Background technology
Chromium and compound is the base stock that the industries such as metallurgy, intermetallic composite coating, plating, process hides, paint, pigment are conventional, produces a large amount of chromium-containing waste gas, waste water and waste residue, cause serious problem of environmental pollution in the production process of above-mentioned industry.And on the other hand, how to carry out the difficult problem repairing always environmental protection circle containing chromium soil.Although method of disposal is numerous, but there is various problem in great majority.The patent No. 201210059303.1 describes a kind of chromium slag contaminated soil heterotopic drip washing prosthetic appliance and restorative procedure, and Cr (VI) is transferred out soil by drip washing and then processes aqueous phase pollution by the method.On the one hand this method is showering, relatively costly.And this method drip washing technique is loaded down with trivial details, and containing substantial amounts of particulate matter and Cr VI in aqueous phase, processing cost is higher, and after reparation, soil still remains certain Cr VI, needs further stabilisation.The patent No. 201110206468.2 describes a kind of electrochemistry showering method containing chromium soil.Though this method can will contain chromium soil reparation, but its power consumption is very big, and the time of process is longer, is not suitable for scale and disposes containing chromium soil.And the chemical reagent such as ferrous iron used by current in-situ remediation method or sulfide the most all also exists secondary pollution problem, and it is easy to be caused disabler by environmental oxidation.The patent No. 201310642919.6 describes one and utilizes the debirs in-situ immobilization method containing Cr (VI) place, this be a kind of can be with the disposal Cr VI soil of low cost, but this method can only be the soil of natural impervious barrier for bottom, otherwise will accelerate Cr VI to subsurface wastewater infiltration system, cause chromic diffusion.
The prevailing technology Han chromium soil is still that and utilizes ferrous sulfate reduction of hexavalent chromium at present, but ferrous sulfate pH is too low, is corrosive, and easy Oxidative inactivation in atmosphere, ferrous iron is the most easily by adsorption by soil cut-off filter, poor permeability, therefore can only be short-term to chromic reduction, it is impossible to reduce for a long time.In order to effectively process containing chromium soil, often add the ferrous sulfate of excess, and this easily brings the secondary pollution of sulfate radical.The patent No. 201410101586.0 describes one and utilizes the ferrous sulfate in-situ immobilization method containing Cr (VI) place, due to ferrous iron easy oxidation deactivation in atmosphere, therefore this method suppresses it to aoxidize with low pH citric acid and increases ferrous infiltration, but add cost accordingly, and make soil acidification, still bring the secondary pollution of sulfate simultaneously.
Summary of the invention
For the deficiencies in the prior art, the present invention uses a kind of method of novel process Cr (VI) contaminated soil, biogas residue, carbon source and ferrous sulfate are configured to pharmacy application in containing in chromium soil, use special maintenance method subsequently, this method can avoid the secondary pollution of sulfate and biogas residue with low cost and efficient reduction of hexavalent chromium simultaneously.It comprises the steps of
(1) biogas residue, sodium sulfate, ferrous sulfate are mixed according to a certain percentage with carbon source solution, after controlling to mix, 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 chromium soil repairs medicament；
(2) chromium place soil will be contained be excavated, be crushed to below 5mm, mix with step (1) described medicament subsequently, mixed proportion be the mass ratio containing chromium soil Yu medicament be 1:(0.1-0.5), be subsequently placed to stockyard close store up；
(3) storing up period, every 3-10 days, ground surface on the scene carried out Water spray, and the average spray flux in place is equivalent to the rainfall of 20-100mm, and natural precipitation can substitute artificial spray, and after 2-10 Water spray, site remediation terminates.
This method passes through step Water spray, promote to carry out alternation of wetting and drying containing chromium soil, the Cr (VI) being difficult to inside soil particle separate out gradually separates out to soil surface with reduction medicament effectively contacts along soil capillary by alternation of wetting and drying, alternation of wetting and drying accelerates the mineralising of biogas residue simultaneously, the most produced volatile organic matter and hydrogen sulfide accelerate volatilization, contribute to the rapid degraded polluted.
Comparing traditional containing chromium soil processing method, this method has a following advantage:
1. the sulfate reduction flora cultivated itself is indigenous flora, and natural tolerance is strong, easily multiplies on a large scale in place, can lasting effective reduction of hexavalent chromium, and do not result in ecological problem；
2. the sulfate in sulfate reducting bacteria in biogas residue microbial inoculum reduction ferrous sulfate, generates sulfide, while more efficient reduction of hexavalent chromium, it is to avoid the secondary pollution of sulfate；
3. this biogas residue microbial inoculum reduction of hexavalent chromium has two big principles, one is that sulfate reducting bacteria inherently has the characteristic utilizing carbon source reduction of hexavalent chromium, but react slower, second is that sulfate reducting bacteria metabolite hydrogen sulfide inherently can reduction of hexavalent chromium, simultaneously because its reduction of hexavalent chromium is chemical reaction, therefore reacting very rapid, this is also that this ecological microbial agent is compared other microbial inoculum and can efficiently be disposed the reason containing chromium soil；
4. the trivalent chromium after reduction and sulfate reducting bacteria metabolite sulfide form chromic sulfide precipitation so that in soil, trivalent chromium is more stable, is significantly better than other biochemical process；
5. due to anaerobism biogas residue and the existence of carbon source, define reducing atmosphere, can effectively alleviate ferrous oxidation by air, decrease the usage amount of ferrous sulfate；The ferrous reduction of this method effective integration simultaneously is fast and advantage that Cr VI can persistently effectively be reduced by biogas residue microbial inoculum, avoids the inferior position that Cr VI can not persistently be reduced by ferrous sulfate simultaneously；
6. this method uses biogas residue and debirs as primary raw material, greatly reduces cost.
It is embodied as example as follows:
Embodiment 1:
(1) ferrous sulfate, biogas residue are mixed according to a certain percentage with carbon source solution, after controlling to mix, 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 0.2:1, mixed solution reaction 1 day, it is thus achieved that chromium soil repairs medicament；
(2) chromium place soil will be contained be excavated, be crushed to below 5mm, mix with step (1) described medicament subsequently, mixed proportion be the mass ratio containing chromium soil Yu medicament be 1:(0.4-0.5), be subsequently placed to stockyard close store up；
(3) storing up period, carry out Water spray every 5 days ground surfaces on the scene, the average spray flux in place is equivalent to the rainfall of 60-80mm, and natural precipitation can substitute artificial spray, and after 2 Water spray, soil content of 6-valence Cr ions is less than 2mg/kg.
Embodiment 2:
(1) biogas residue, sodium sulfate are mixed according to a certain percentage with carbon source solution, after controlling to mix, 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 for (0-1): 1, mixed solution reaction 0-5 days, it is thus achieved that chromium soil repairs medicament；
(2) chromium place soil will be contained be excavated, be crushed to below 5mm, mix with step (1) described medicament subsequently, mixed proportion be the mass ratio containing chromium soil Yu medicament be 1:0.3, be subsequently placed to stockyard close store up；
(3) storing up period, carry out Water spray every 8 days ground surfaces on the scene, the average spray flux in place is equivalent to the rainfall of 20-100mm, and natural precipitation can substitute artificial spray, and after 3 Water spray, soil content of 6-valence Cr ions is less than 4mg/kg.
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 (5)
1. a novel contaminated soil Cr VI detoxification based on biogas residue, is characterized in that, comprise the steps of
(1) ferrous sulfate, sodium sulfate, biogas residue are mixed according to a certain percentage with carbon source solution, after controlling to mix, 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 chromium soil repairs medicament；
(2) chromium place soil will be contained be excavated, be crushed to below 5mm, mix with step (1) described medicament subsequently, mixed proportion be the mass ratio containing chromium soil Yu medicament be 1:(0.1-0.5), be subsequently placed to stockyard close store up；
(3) storing up period, every 3-10 days, ground surface on the scene carried out Water spray, and the average spray flux in place is equivalent to the rainfall of 20-100mm, and natural precipitation can substitute artificial spray, and after 2-10 Water spray, site remediation terminates.
A kind of novel contaminated soil Cr VI detoxification 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 soil Cr VI detoxification 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, it is also possible to for industrial and municipal organic wastewater.
A kind of novel contaminated soil Cr VI detoxification based on biogas residue, is characterized in that, the described water in Water spray can be substituted by organic solution, and the organic carbon content of organic solution is 10-1000mg/L.
A kind of novel contaminated soil Cr VI detoxification based on biogas residue, is characterized in that, bottom described closing stockyard and surrounding use anti-seepage geomembrane, prevent pollutant from spreading.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114309043A (en) * | 2021-07-30 | 2022-04-12 | 江南大学 | Preparation method and application of cadmium-polluted soil leacheate with biogas residues as raw materials |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102476130A (en) * | 2010-11-26 | 2012-05-30 | 李兴 | Restoration treatment reduction method for hexavalent chromium-containing soil |
| 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 |
| WO2013116618A1 (en) * | 2012-02-03 | 2013-08-08 | The Research Foundation Of State University Of New York | Electrochemical synthesis of nitro-chitosan |
| CN104492802A (en) * | 2014-12-15 | 2015-04-08 | 山东省环境保护科学研究设计院 | Method for reducing and stabilizing chromium-contaminated soil by chemical-biological coupling |
| CN104785518A (en) * | 2015-05-01 | 2015-07-22 | 韩清洁 | Remediation method of chromium contaminated soil |
-
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- 2016-05-30 CN CN201610370403.4A patent/CN105945064A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102476130A (en) * | 2010-11-26 | 2012-05-30 | 李兴 | Restoration treatment reduction method for hexavalent chromium-containing soil |
| WO2013116618A1 (en) * | 2012-02-03 | 2013-08-08 | The Research Foundation Of State University Of New York | Electrochemical synthesis of nitro-chitosan |
| 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 |
| CN104492802A (en) * | 2014-12-15 | 2015-04-08 | 山东省环境保护科学研究设计院 | Method for reducing and stabilizing chromium-contaminated soil by chemical-biological coupling |
| CN104785518A (en) * | 2015-05-01 | 2015-07-22 | 韩清洁 | Remediation method of chromium contaminated soil |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114309043A (en) * | 2021-07-30 | 2022-04-12 | 江南大学 | Preparation method and application of cadmium-polluted soil leacheate with biogas residues as raw materials |
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