CN102029288A - Method for degrading DDT (dichloro diphenyl tricgloroethane) in situ - Google Patents
Method for degrading DDT (dichloro diphenyl tricgloroethane) in situ Download PDFInfo
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- CN102029288A CN102029288A CN2009100937687A CN200910093768A CN102029288A CN 102029288 A CN102029288 A CN 102029288A CN 2009100937687 A CN2009100937687 A CN 2009100937687A CN 200910093768 A CN200910093768 A CN 200910093768A CN 102029288 A CN102029288 A CN 102029288A
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Abstract
The invention relates to a method for degrading DDT (dichloro diphenyl tricgloroethane) in situ, which comprises: Na2S is added to DDT contaminated soil (or bottom sediment) under the anaerobic environment of flood, wherein Na2S can directly degrade the DDT in a solution in situ, and a large amount of Fe2<+> existing in the solution can promote the degradation of Na2S on the DDT. The method can effectively degrade DDTs pesticides, reduce the DDTs into a food chain from a source and lower the toxic hazard danger of the DDTs. The method has the advantages of high degradation speed, high efficiency and no secondary pollution generation on the reaction, and is a method capable of effectively degrading the DDTs in situ.
Description
Technical field
The inventive method belongs to the Environmental Chemistry technical field, and it is applicable to that the DDT under the waterflooding anaerobic environments such as water body, water body deposit, wetland pollutes, and the DDT pollution concentration after the processing is up to state standards.
Background technology
In the 60-80 age in 20th century, DDT (DDT) once was extensive use of as pesticide.But the DDT that studies have shown that subsequently is a kind of persistence toxic organic pollutant of chloride, difficult degradation.It can be accumulated in fat by food chain, and people and many organisms are had the acute toxicity of moderate strength, even " three cause " (carcinogenic, teratogenesis, mutagenesis) effect is arranged." about the Convention of Stockholm of persistence organic pollutant " of calendar year 2001 more than 100 common signatures of country classified DDT as one of 12 kinds of persistence organic pollutants of preferential control and elimination.Nineteen eighty-three, China begins to forbid DDT, but the recall rate of DDT is still very high in many soil and agricultural product.Reason may be, on the one hand because the steady chemical structure of DDT, and difficult degradation, the residence time is long; Be a large amount of uses of agricultural chemicals dicofol on the other hand, and at present domestic most of dicofol products still are main intermediate with DDT, not the passing a test of residual refinement link causes DDT content overproof in large quantities of finished products (can reach national standard 40 times).
In view of the harmfulness of DDTs, the degraded of DDTs has obtained paying close attention to widely both at home and abroad, has also obtained very big progress.The degradation of pesticide technology mainly comprises at present: chemical method and biological method.Compare with traditional chemical method, biological method is a method generally regarded as safe, effective, non-secondary pollution.Biodegradation mainly comprises two aspects: the one, and plant degradation mainly is that DDT is absorbed in the plant, utilizes the enzyme degraded DDT in the body, perhaps secretes some certain enzyme degraded DDT by root system; The 2nd, microbial degradation, the domestic and international bacterial strain that has filtered out some DDT that can effectively degrade.But also there are some defectives in biological method.Growth cycle as plant in the plant degradation process is long, has caused the slow of degradation rate, is not suitable for high density pollution.The microbial degradation technology then is subjected to the restriction of many environmental factors (as pH, temperature, environment substrate etc.).
Chemical degradation method has advantages such as reaction speed is fast, the condition controllability is strong, is suitable for the quick reparation of the acute pollution of high concentration.
Because S
2-Have good reproducibility, can reduction dechlorination degraded DDT, S simultaneously
2-The SO of oxidized generation
4 2-, also be that plant must nutrient.A large amount of Fe that exist under the waterflooding anaerobic status
2+To S
2-Degraded DDT has very strong facilitation.For this reason, can utilize Na
2The reproducibility of S degraded DDT has that reaction rate is fast, a non-secondary pollution, the characteristics that are easy to promote.
Summary of the invention
The purpose of this invention is to provide a kind of can original position degraded DDT, but do not produce the method for secondary pollution.
For achieving the above object, the method for original position degraded DDT provided by the invention is S
2-Join in the contaminated soil solution, with the Fe that exists in the soil
2+Interact, promote S
2-Directly degraded DDT advances S
2-DDT directly degrades.
S among the present invention
2-Can be the Na that adds
2S.
Among the present invention, S
2-Addition decide on the level of pollution of DDT in the soil liquid, generally be controlled at when the level of pollution of DDT in the soil liquid is 2000ng/ml S
2-Addition be 3-5mmol/L, preferably S
2-Addition be 5mmol/L.
Effect of the present invention is Na
2But the DDT in the S efficient degradation soil liquid.And the used Na of the present invention
2S is common chemical reagent, and preparation is simple, and cost is low.Compare with other chemical reagent, have non-secondary pollution; Compare with biological method that to have a degradation rate fast, advantage such as environmental requirement is low.It is the method for a kind of effective original position degraded DDT.
The specific embodiment
The method of degraded DDT provided by the invention is with Na
2S joins in the soil liquid that contains DDT, and the DDT in the soil extracting solution system that directly degrades utilizes the Fe in the waterflooding anaerobic environment simultaneously
2+Promote S
2-Degraded to DDT.
Na of the present invention
2The addition of S can be decided according to the level of pollution of DDT in the soil liquid, generally is controlled at when the level of pollution of DDT in the soil liquid is 2000ng/ml S
2-Addition be 3-5mmol/L, preferably S
2-Addition be 5mmol/L, under these conditions, the time of degraded DDT is 4-6 hour.
This method is the residual DDT that takes in the ultrasonic concussion extraction solution, and chromatography of gases (G C) detects the DDT residual concentration, and GC-MS analyzes the DDT metabolite.
Embodiment 1:Na
2The S various dose is to the degraded of DDT in the soil liquid
Level of pollution for examination soil liquid DDT is 2000ng/ml, is provided with following three groups and contrasts and compare, and first group for not adding Na
2The blank group of S, second group is 0.5mmol/LNa
2S, the 3rd group is 5mmol/LNa
2S establishes 4 repetitions for every group.Place 30 ± 0.5 ℃ of incubators to cultivate respectively.The sampling and measuring time is 0.5 hour, 1 hour, 2 hours, 4 hours, 6 hours.
The result shows that the degradation rate order of DDT in each is handled is:
The 3rd group of (5mmol/LNa
2S)＞second group (0.5mmol/LNa
2S)＞first group (blank group), promptly its degradation rate is along with Na
2The increase of S addition and increasing.5mmol/LNa
2The degradation rate that S handles is up to 74%.
Embodiment 2:Fe
2+To Na
2The facilitation of degraded DDT in the S soil liquid system
Level of pollution for examination soil liquid DDT is 2000ng/ml, is provided with following five groups and contrasts, and first group is blank group, does not promptly add Na
2S and Fe
2+Second group is 0.5mmol/L Na
2S; The 3rd group is 5mmol/L Na
2S; The 4th group is 0.5mmol/L Na
2S+3mmol/L Fe
2+The 5th group is 5mmol/LNa
2S+3mmol/L Fe
2+, 4 samples of every group of reprocessing.Place 30 ± 0.5 ℃ of incubators to cultivate respectively.The sampling and measuring time is 0.5 hour, 1 hour, 2 hours, 4 hours, 6 hours.
The result shows: the degradation rate order of DDT in each is handled is:
The 5th group of (5mmol/LNa
2S+3mmol/L Fe
2+)＞the 3rd group (5mmol/L Na
2S)＞the 4th group (0.5mmol/L Na
2S+3mmol/L Fe
2+)＞second group (0.5mmol/L Na
2S)＞first group (blank group).By above results of comparison as seen, Fe
2+To Na
2The S DDT that degrades in the soil liquid has facilitation.The 5th group of (5mmol/LNa
2S+3mmol/L Fe
2+) degradation rate handled is up to 99%, Fe is being rich in this explanation
2+Water body, soil, bed mud solution in, Na
2S is extremely strong to the removal effect of DDT.
Claims (4)
1. the method for an original position degraded DDT is characterized in that, with S
2-Join in the contaminated soil solution, with the Fe that exists in the soil
2+Interact and promote S
2-DDT directly degrades.
2. the method for original position degraded DDT according to claim 1 is characterized in that described S
2-Be the Na that adds
2S.
3. the method for original position degraded DDT according to claim 1 is characterized in that, when the level of pollution of DDT is 2000ng/ml in the soil liquid, and S
2-Addition be 3-5mmol/L.
4. the method for original position degraded DDT according to claim 1 is characterized in that, when the level of pollution of DDT is 2000ng/ml in the soil liquid, and S
2-Addition be 5mmol/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100937687A CN102029288A (en) | 2009-09-28 | 2009-09-28 | Method for degrading DDT (dichloro diphenyl tricgloroethane) in situ |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100937687A CN102029288A (en) | 2009-09-28 | 2009-09-28 | Method for degrading DDT (dichloro diphenyl tricgloroethane) in situ |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102029288A true CN102029288A (en) | 2011-04-27 |
Family
ID=43883053
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100937687A Pending CN102029288A (en) | 2009-09-28 | 2009-09-28 | Method for degrading DDT (dichloro diphenyl tricgloroethane) in situ |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102816696A (en) * | 2012-07-06 | 2012-12-12 | 华东理工大学 | Preparation method of fungicide for anaerobic degradation of hydrochloric ether and application thereof |
| CN102896145A (en) * | 2011-07-27 | 2013-01-30 | 中国科学院研究生院 | Method for remediation of dicofol sewage contaminated soil |
| CN102896144A (en) * | 2011-07-27 | 2013-01-30 | 中国科学院研究生院 | Method for in situ remediation of DDTs contaminated soil |
| CN107497848A (en) * | 2017-09-25 | 2017-12-22 | 南京律智诚专利技术开发有限公司 | A kind of method of Determination of organochlorine pesticides in soil reparation |
| CN115041519A (en) * | 2022-06-14 | 2022-09-13 | 沈阳大学 | Method for efficiently degrading soil PAHs and DDTs composite pollution by combining enhanced microorganism sequential anaerobic-aerobic |
-
2009
- 2009-09-28 CN CN2009100937687A patent/CN102029288A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102896145A (en) * | 2011-07-27 | 2013-01-30 | 中国科学院研究生院 | Method for remediation of dicofol sewage contaminated soil |
| CN102896144A (en) * | 2011-07-27 | 2013-01-30 | 中国科学院研究生院 | Method for in situ remediation of DDTs contaminated soil |
| CN102816696A (en) * | 2012-07-06 | 2012-12-12 | 华东理工大学 | Preparation method of fungicide for anaerobic degradation of hydrochloric ether and application thereof |
| CN107497848A (en) * | 2017-09-25 | 2017-12-22 | 南京律智诚专利技术开发有限公司 | A kind of method of Determination of organochlorine pesticides in soil reparation |
| CN115041519A (en) * | 2022-06-14 | 2022-09-13 | 沈阳大学 | Method for efficiently degrading soil PAHs and DDTs composite pollution by combining enhanced microorganism sequential anaerobic-aerobic |
| CN115041519B (en) * | 2022-06-14 | 2023-09-08 | 沈阳大学 | Method for efficiently degrading soil PAHs and DDTs combined pollution by combining enhanced microorganism sequence anaerobic-aerobic |
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Application publication date: 20110427 |