Method for in situ remediation of DDTs contaminated soil

A technology for in-situ remediation of polluted soil, applied in the field of environmental chemistry, can solve problems such as unsuitable for high-concentration pollution, long plant growth cycle, and slow degradation rate, and achieve the effects of low cost, fast degradation rate, and simple preparation

Inactive Publication Date: 2014-05-21
GRADUATE SCHOOL OF THE CHINESE ACAD OF SCI GSCAS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of plant degradation, the growth cycle of plants is long, which leads to slow degradation rate, which is not suitable for high concentration pollution; microbial degradation technology is restricted by many environmental factors (such as pH, temperature, environmental substrate, etc.)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: Different doses of Na 2 S 2 o 8 Comparison of Degradation Effects of DDTs in Contaminated Soil

[0013] The pollution levels of DDT and DDE in the flooded soil mud for the test were 115mg / kg and 12mg / kg respectively, and the following 6 groups of treatments were set up:

[0014] 1) Control;

[0015] 2)Na 2 S 2 o 8 (10mmol / L)+FeSO 4 ·7H 2 O (30mmol / L);

[0016] 3)Na 2 S 2 o 8 (20mmol / L)+FeSO 4 ·7H 2 O (30mmol / L);

[0017] 4)Na 2 S 2 o 8 (40mmol / L)+FeSO 4 ·7H 2 O (30mmol / L);

[0018] 5)Na 2 S 2 o 8 (60mmol / L)+FeSO 4 ·7H 2 O (30mmol / L);

[0019] 6)Na 2 S 2 o 8 (80mmol / L)+FeSO 4 ·7H 2 O (30mmol / L).

[0020] Each group has 3 repetitions. Cultured in a 20°C incubator. The sampling measurement time is 0 hour, 1 hour, 2 hours, 3 hours, 4 hours.

[0021] The results show that the order of cumulative degradation of DDTs in different treatments in 4 hours is (according to S 2 o 8 2- / Fe 2+ Molar ratio): 10 / 302 o 8 2- increase ...

Embodiment 2

[0022] Embodiment 2: Different doses of Fe 2+ Comparison of Degradation Effects on DDTs in Soil

[0023] The pollution levels of DDT and DDE in the flooded soil mud for the test were 115mg / kg and 12mg / kg respectively, and the following 5 groups of treatments were set up:

[0024] 1) Control group;

[0025] 2) FeSO 4 ·7H 2 O(10mmol / L)+Na 2 S 2 o 8 (60mmol / L);

[0026] 3) FeSO 4 ·7H 2 O(20mmol / L)+Na 2 S 2 o 8 (60mmol / L);

[0027] 4) FeSO 4 ·7H 2 O(40mmol / L)+Na 2 S 2 o 8 (60mmol / L);

[0028] 5) FeSO 4 ·7H 2 O(50mmol / L)+Na 2 S 2 o 8 (60mmol / L).

[0029] Cultured in a 20°C incubator. Sampling measurement time: 0 hour, 1 hour, 2 hours, 3 hours, 4 hours.

[0030]The result shows that the 4-hour cumulative degradation order of DDT in different treatments is (according to S 2 o 8 2- / Fe 2+ molar ratio): 60 / 102 o 8 2- / Fe 2+ The degradation amount of the treatment group was the highest, which could reach 89mg / kg.

[0031] Comprehensive two groups of emb...

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Abstract

The invention relates to a method for in situ remediation of DDTs contaminated soil. According to the method, compounds containing Fe<2+> and S2O8<2-> are added into the contaminated soil for direct degradation of DDTs. The method provided in the invention can effectively degrade the DDTs residue in soil (sediment), reduce the entrance of DDTs into a food chain from the source, and reduce the poisoning risk of DDTs on people and livestock. With the advantages of fast degradation rate, high efficiency, and no secondary pollution, the method provided in the invention is an effective method for in situ remediation of DDTs contaminated soil.

Description

technical field [0001] The method of the invention belongs to the technical field of environmental chemistry, is suitable for DDTs pollution in flooded anaerobic environments such as soil, bottom mud, wetlands, sewage, etc., and can make the DDTs pollution concentration after treatment reach the national standard. Background technique [0002] In the 1960s-1980s, DDT was widely used as an insecticide. However, subsequent studies have proved that DDT is a persistent toxic organic pollutant that is difficult to degrade. It can accumulate in fat through the food chain, has moderate acute toxicity to humans and many organisms, and even has "three causes" (carcinogenic, teratogenic, and mutagenic) effects. The "Stockholm Convention on Persistent Organic Pollutants" signed by more than 100 countries in 2001 listed DDTs as one of the 12 persistent organic pollutants that are prioritized for control and elimination. In 1983, my country began to ban DDTs, but the detection rate of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
Inventor 胡正义鲍鹏巴玉鑫华晶温国期朱春游
Owner GRADUATE SCHOOL OF THE CHINESE ACAD OF SCI GSCAS
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