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Method for remedying soil polluted by difficultly degradable chlorinated organics

A technology of chlorinated organic matter and polluted soil, applied in the field of contaminated soil remediation, can solve the problems of complex remediation process, lack of anti-seepage measures, high cost, etc., and achieve the effect of reducing costs

Active Publication Date: 2011-10-26
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are some problems in the remediation technology of soil contaminated by refractory chlorinated organic compounds, and no reasonable, effective and low-cost remediation methods have been found.
For example, in the Chinese invention patent application 201010248864.7, the anaerobic-aerobic composting method is used to remediate PCB-contaminated soil. It uses surface coating to isolate the compost from the outside, but does not effectively control the water, and lacks Anti-seepage measures
In addition, this method needs to use large-scale machinery to turn over the stack many times, and the whole repair process is relatively complicated, and the amount of work in the repair is relatively large and the cost is high

Method used

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  • Method for remedying soil polluted by difficultly degradable chlorinated organics
  • Method for remedying soil polluted by difficultly degradable chlorinated organics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A PCB-contaminated plot is 220m long and 105m wide. The contents of seven indicative PCBs in the soil are shown in Table 1, and the pollution is concentrated in the soil 50cm away from the surface. Now adopt the embodiment of the present invention to process its polluted soil. At the same time, another soil was taken in the unit as a control group. 7 kinds of indicative PCBs were determined by GC-ECD method, and a total of 10 samples were collected in each group for analysis and then the average was obtained.

[0024] Table 1 Contents of 7 indicative PCBs in polluted soil

[0025] name

Content (μg·kg -1 )

name

Content (μg·kg -1 )

PCB28

72.77±35.25

PCB138

19.65±12.01

PCB52

32.25±12.32

PCB153

10.40±2.38

PCB101

12.47±1.63

PCB180

2.53±4.06

PCB118

16.34±1.92

ΣPCB

166.42±49.57

[0026] The soil conditioner is prepared first, and the adopted formula is 8 parts...

Embodiment 2

[0031] A plot polluted by organochlorine pesticides is 300m long and 120m wide. The soil is mainly polluted by HCH and DDT, the content of which is shown in Table 2, and the pollution is concentrated in the soil 70cm away from the surface. Now adopt the embodiment of the present invention to process its polluted soil. At the same time, another soil was taken in the unit as a control group. 666. DDT was measured by GC-ECD method. A total of 10 samples were collected in each group for analysis and the average was calculated.

[0032] Table 2 Concentrations of HCH and DDT in polluted soil

[0033] name

Content (μg·kg -1 )

name

Content (μg·kg -1 )

α-666

0.308±0.103

p,p'-DDD

0.191±0.012

β-666

9.836±1.23

p,p'-DDE

0.417±0.023

[0034] γ-666

0.026±0.016

o,p'-DDE

0.429±0.041

δ-666

0.323±0.091

p,p'-DDT

1.481±0.219

total - six six six

10.553±1.32

T...

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Abstract

The invention discloses a method for remedying soil polluted by difficultly degradable chlorinated organics, in the method a static composting mode is adopted to remedy the polluted soil. The method mainly comprises the steps of site preparation, pile construction and pipe regulation: first combining a certain amount of soil amendment for ameliorating soil by utilizing site preparation; then constructing a relatively controlled pile environment by utilizing an anti-permeable membrane, a drop irrigation hose and an upper-half perorated pipe; and finally, regulating pile state through recharging, aeration and other mode, thus achieving effect of alternating anaerobic-aerobic piling. The remedying method has the advantages of good controllability, high degradation efficiency, simplicity in construction, low remediation cost, and the like, and can be applicable to remediation on soil polluted by various or composite difficultly degradable chlorinated organics.

Description

technical field [0001] The invention belongs to the technical field of remediation of polluted soil, and in particular relates to an on-site remediation method of soil polluted by refractory chlorinated organic matter Background technique [0002] Refractory chlorinated organic compounds are a typical class of environmental pollutants, mainly including chlorinated benzenes, organochlorine pesticides, polychlorinated biphenyls and dioxins. The 12 global priority pollutants included in the Stockholm Convention are all chlorinated organic compounds. Such substances usually have the characteristics of low water solubility and high fat solubility, and are very easy to bioaccumulate in adipose tissue, and reach toxic concentrations through the biomagnification of the food chain, and have the "three causes" of teratogenic, carcinogenic, and mutagenic sex. Since the chemical structure and properties of chlorinated organic compounds are extremely stable, they have strong resistance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 沈东升汪美贞张弛廖燕陈应强宋二喜冯华军
Owner ZHEJIANG GONGSHANG UNIVERSITY
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