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Method for remedying DDT polluted soil by ultrasonic wave

A technology of polluted soil and ultrasonic wave, applied in the direction of restoration of polluted soil, can solve the problems of long treatment period and high operating cost, and achieve the effect of fast removal rate, low investment and operating cost, and high mineralization rate

Inactive Publication Date: 2009-12-09
NANJING UNIV OF INFORMATION SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the shortcomings of high secondary pollution risk, high operating cost and long treatment cycle in the existing soil remediation technology, the present invention provides a method for ultrasonic remediation of DDT-contaminated soil, which has low secondary pollution risk and high efficiency Advantages of low power consumption and strong operability

Method used

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  • Method for remedying DDT polluted soil by ultrasonic wave
  • Method for remedying DDT polluted soil by ultrasonic wave

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The organic matter content of the tested soil is 17.87g / kg soil; Fe in the soil 2 o 3 , MnO 2 、TiO 2 The content of DDT in the soil is 55.15g / kg, 1.34g / kg, 15.21g / kg soil respectively; the concentration of DDT in the soil before remediation is 1mg / kg soil; the soil humidity is 60%; The frequency is 20kHz; the ultrasonic irradiation power is 300W; the ultrasonic irradiation time is 15min; the ultrasonic emission adopts probe-type equipment (such as figure 2 ). The content of DDT in the remediation soil was 285 μg / kg soil, and the removal rate of DDT was 71.5%.

Embodiment 2

[0024] Substantially the same as Example 1, but the soil organic matter content used is 11.24g / kg soil, Fe 2 o 3 , MnO 2 、TiO 2 The contents are 49.62g / kg, 0.95g / kg, 9.36g / kg soil respectively. The ultrasonic removal rate of DDT was 73.9%.

Embodiment 3

[0026] In embodiment 1, other conditions are constant, and when DDT concentration is 0.5mg / kg soil in the soil before repairing, DDT removal rate is 72.3%; When DDT concentration is 5mg / kg soil in the soil before repairing, DDT removal rate is 68.1% .

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Abstract

The invention belongs to the organic polluted soil remediation field, and discloses a method for remedying DDT polluted soil by ultrasonic wave. The method comprises the following steps: organic polluted soil slurry in which the water content is 15%-95% and the initial concentration of the DDT is 100-100000mu g / kg is treated on the condition of ultrasonic irradiation, while the ultrasonic frequency is 20kHz-500kHz, the ultrasonic power is 50W-2.0kw, and the ultrasonic irradiation time is 1min-2h. In the invention, the cavitation effect and perturbation effect of the ultrasonic wave are used for degrading or reducing organic chloride pesticide pollutant in the soil like DDT. The method uses pumps to continuously transport soil slurry to ultrasonic reaction equipment, thus being easy for remediation of the polluted soil in site. Compared with the prior art in remediation of organic chloride pesticide polluted soil, the method in the invention is nearly not affected by pollutant categories and environmental condition, thus being applied in a wide range. The method is efficient with low consumption, low risk of secondary pollution, strong operation and has good social benefit and environmental benefit.

Description

technical field [0001] The invention relates to a method for remediating soil polluted by organic matter, in particular to organic chlorides such as DDT (DDT, aliased as 2,2-bis(4-chlorophenyl)-1,1,1-trichloroethane). Remediation of pesticide-contaminated soil. Background technique [0002] DDT is one of the first 12 persistent organic pollutants (Persistent Organic Pollutants, POPs) included in the Stockholm Convention on Persistent Organic Pollutants. As a major category of POPs, organochlorine pesticides are a class of chemical pollutants that are widely used, highly toxic, and widely polluted by people in the environment. As a typical representative of organochlorine pesticides, DDT was produced and used in large quantities in my country in the 1960s to 1980s, with a cumulative consumption of more than 400,000 tons, accounting for 20% of the international consumption. The persistence and bioaccumulation of DDT determine that it is extremely harmful to human health and ...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 郭照冰张超唐登勇马建军冯若
Owner NANJING UNIV OF INFORMATION SCI & TECH
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