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Method for remedying soil polluted by organic chloride

A technology of polluted soil and organic chlorine, applied in the field of soil remediation, to achieve the effect of obvious effect, good effect and no secondary pollution

Active Publication Date: 2010-10-06
NJTECH ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for remediating high-concentration organochlorine-contaminated soil in view of the defects existing in the remediation technology of heavy organic polluted soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The soil was taken back from the polluted site, and the mass moisture content of the soil sample was 5%-18%. After mixing the soil sample, it was detected that the mass moisture content was 13%, and the DDT concentration was 50.3mg / kg, which met the requirements described in this patent. Appropriate treatment conditions, directly carry out microwave ultrasonic synergistic degradation on it, the treatment steps are as follows:

[0033] 1. The mass moisture content of the treated soil sample is 13%;

[0034] 2. Simultaneously turn on the microwave and ultrasonic generators to irradiate the soil, the microwave frequency is 2450MHz, the power is 1.5kW, the ultrasonic frequency is 20kHz, and the power is 400W;

[0035] 3. The irradiation time is 5 minutes.

[0036] The treated soil was tested, and the test results showed that the concentration of DDT in the soil was 3.2mg / kg, and the removal rate reached 93.6%.

Embodiment 2

[0038] At the site of the polluted site, the mass moisture content of the soil sample is 10%-20% and the concentration of DDT is 310mg / kg-350mg / kg, which meets the suitable treatment conditions described in this patent. It is subjected to microwave ultrasonic synergistic degradation, and the processing steps are as follows:

[0039] 1. The mass moisture content of the treated soil sample is 10% to 20%;

[0040] 2. Simultaneously turn on the microwave and ultrasonic generators to irradiate the soil, the microwave frequency is 2450MHz, the power is 5kW, the ultrasonic frequency is 20kHz, and the power is 4kW;

[0041] 3. The irradiation time is 15 minutes.

[0042] The treated soil samples are tested, and the test results show that the concentration of DDT in the soil is 4.5mg / kg-9.6mg / kg, and the average removal rate is above 95%.

Embodiment 3

[0044] The soil was retrieved from the polluted site, and its mass moisture content was 20%-35%. After mixing the soil sample, it was detected that its mass moisture content was 31%. After analysis, the concentration of chlordane was 230.5mg / kg, which met the requirements of this patent. Under the appropriate treatment conditions, it is subjected to microwave ultrasonic synergistic degradation, and the treatment steps are as follows:

[0045] 1. The mass moisture content of the soil sample is 31%;

[0046] 2. Simultaneously turn on the microwave and ultrasonic generators to irradiate the soil, the microwave frequency is 915MHz, the power is 10kW, the ultrasonic frequency is 60kHz, and the power is 1kW;

[0047] 3. The irradiation time is 10 minutes.

[0048] The treated soil was tested, and the test results showed that the concentration of chlordane in the soil was 15.9mg / kg, and the removal rate reached 93.1%.

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Abstract

The invention, which belongs to the field of polluted soil remediation, in particular to a method for remedying soil polluted by high concentration of organic chloride with a microwave-ultrasonic wave synergia technique. Organic chloride-polluted soil with a certain water ratio is treated under the irradiation of microwaves and ultrasonic waves, the microwave frequency is 300MHz to 300GHz, the power is 0.8kW to 20kW, the ultrasonic frequency is 20kHz to 100kHz, the power is 100W to 5kW, and the irradiation time is 3min to 120min. The organic chloride is mainly dichloro-diphenyl-trichloroethane, chlordane, mirex and the like. The method mainly utilizes the cavatition of ultrasonic waves and the thermal effect and non-thermal effect of microwaves to degrade organic chloride pollutants in the soil, the basic structure and properties of the soil are not destroyed in the process of efficiently degrading the organic chloride in the soil, the reaction time is short, the treatment effect is good, secondary pollution is not generated, and therefore the method has obvious economic and environmental effects.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to the remediation of high-concentration organochlorine-contaminated soil, in particular to a method for remediating organochlorine-contaminated soil with microwave-ultrasonic collaborative technology. Background technique [0002] With the development of my country's industrialization and urbanization and the implementation process of the "Stockholm International Convention", a large number of organochlorine pesticide production enterprises that have been closed or to be closed and relocated have emerged in recent years. According to incomplete statistics, there are only hundreds of sites polluted by organochlorine pesticides (DDT, HCH, chlordane, mirex, etc.) across the country. These sites are extremely polluted, and the total concentration of pollutants is mostly above 200mg / kg. Moreover, most sites are in urgent need of functional conversion and secondary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/06
Inventor 徐炎华朱骏赵浩黄洋
Owner NJTECH ENVIRONMENT TECH CO LTD
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