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A kind of composition and application thereof for processing ddt in polluted soil

A technology of polluted soil and composition, applied in the field of soil remediation, can solve problems such as organochlorine pesticide DDT pollution, and achieve the effects of fast production speed, stable production rate, and economical efficiency

Active Publication Date: 2021-03-16
江苏洁壤环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Technical problem to be solved: In order to solve the pollution problem of organochlorine pesticide DDT in soil, the present invention provides a composition for degrading DDT in soil and its application

Method used

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  • A kind of composition and application thereof for processing ddt in polluted soil
  • A kind of composition and application thereof for processing ddt in polluted soil
  • A kind of composition and application thereof for processing ddt in polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The solid-to-liquid ratio was 1:10 (g / mL), the PS concentration was 0.1M, and the temperature was 50°C. The effects of initial aerobic and anaerobic conditions on DDT removal were compared.

[0029] A 9mL brown bottle with a polytetrafluoroethylene gasket on the cover was used as the reaction vessel, and 0.5g of contaminated soil was weighed into the reaction vessel, and the prepared PS solution was added, and water was added to make the concentration of PS 0.1M, and the volume of the solution was 5mL. The reaction bottle was placed in a reciprocating shaking box at 200 rpm, and reacted for 3 days. Initial anaerobic conditions: the aqueous solution was purged with nitrogen for 30 minutes, the PS solution was prepared with anaerobic water, and the reaction samples were prepared in an anaerobic glove box. Initial aerobic conditions: It is not necessary to blow the aqueous solution with nitrogen, and the reaction sample preparation is carried out in air.

[0030] The res...

Embodiment 2

[0032] The solid-to-liquid ratio was 1:10 (g / mL), the PS concentration was 0.1M, and the initial anaerobic condition was used to compare the effect of the temperature at 60-70°C on the removal of DDT.

[0033]A 9mL brown bottle with a Teflon gasket on the cover was used as the reaction vessel, and 0.5g of contaminated soil was weighed into the reaction vessel, and the prepared PS solution was added, and water was added so that the concentration of PS was 0.1M, and the volume of the solution was 5mL. The reaction bottle was placed in a reciprocating shaking box at 200rpm. The aqueous solution was purged with nitrogen for 30 minutes, the PS solution was prepared with anaerobic water, and the reaction samples were prepared in an anaerobic glove box.

[0034] The result is as figure 2 As shown, the reaction temperature is 60°C, and after 3 days of reaction, the degradation rates of p,p'-DDT and o,p'-DDT can reach 94% and 95%. The reaction temperature is 70°C, and after 0.5 day...

Embodiment 3

[0036] The solid-to-liquid ratio was 1:10 (g / mL), the PS concentration was 0.1M, the temperature was 50°C, and the initial anaerobic condition was used to compare the effect of PS on the removal effect of DDT at 0.2-0.5M.

[0037] Use a 9mL brown bottle with a Teflon gasket as the reaction vessel, weigh 0.5g of contaminated soil into the reaction vessel, add the prepared PS solution, and add water to make the concentration of PS 0.2 and 0.5M. The volume is 5 mL. The reaction bottle was placed in a reciprocating shaking box at 200rpm. The aqueous solution was purged with nitrogen for 30 minutes, the PS solution was prepared with anaerobic water, and the reaction samples were prepared in an anaerobic glove box.

[0038] The result is as image 3 It was shown that when the concentration of PS was 0.2M, the degradation rates of p,p'-DDT and o,p'-DDT could reach 89% and 85% after 3 days of reaction. The PS concentration was 0.5M, and after 3 days of reaction, the degradation rat...

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Abstract

The invention discloses a composition for treating DDT (dichlorodiphenyltrichloroethane) in polluted soil and an application of the composition. According to the composition, under an anaerobic condition, sodium persulfate is subjected to thermal activation to generate reductive peroxydisulfate free radicals, and DDT in water and soil can be effectively degraded; and in addition, under a conditionthat ethanol is added, ethanol free radicals can be generated from a reaction system, and DDT in the soil can be rapidly and efficiently degraded. The application method is applicable to treatment onDDT polluted soil, has the advantages of being high in efficiency, convenient to operate, friendly to environment, low in cost, and the like, and has wide prospects for repairing high-halogenated organic polluted soil.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a composition for rapidly treating DDT-contaminated soil and an application thereof. Background technique [0002] PS-based advanced oxidation is a new technology developed in recent years, which is widely used in in-situ remediation of soil and groundwater. PS is a strong oxidizing agent (redox potential E 0 =2.1V), can directly degrade organic pollutants, in addition, PS can produce SO by heating and different activation methods 4 ·- , with a higher redox potential (E 0 =2.6~3.0V), it can quickly degrade pollutants such as dyes, chlorophenols, and vinyl chloride. The use of oxidative free radicals in the PS system to degrade organic pollutants is a hotspot in the field of advanced oxidation technology. In addition, some highly halogenated organic pollutants widely exist in the environment, such as perfluorinated compounds, polybrominated diphenyl ethers...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/08
CPCB09C1/08C09K17/40
Inventor 朱长银方国东周东美陈宁
Owner 江苏洁壤环保科技有限公司
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