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Progressive repair method for soil polluted by chlorinated organic compounds

A technology for chlorinated organic matter and polluted soil, which is applied in the field of stepwise remediation of chlorinated organic matter-contaminated soil, can solve the problems of high chemical stability, residual toxicity of soil, and difficult to decompose, and achieves the promotion of biodegradation, avoidance of microbial toxicity, and biocompatibility. good effect

Inactive Publication Date: 2015-01-28
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional surfactants have high chemical stability, are difficult to decompose, and have soil residual toxicity, which is not conducive to further reclamation and utilization of soil.

Method used

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  • Progressive repair method for soil polluted by chlorinated organic compounds
  • Progressive repair method for soil polluted by chlorinated organic compounds
  • Progressive repair method for soil polluted by chlorinated organic compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this example, 2,4,6-trichlorophenol-contaminated soil is the object to be treated. Firstly, the simulated contaminated soil samples were prepared. Take clean southern red soil, crush, air-dry, and sieve, take 1000 grams of dried soil and add 200 ml of 500 mg / L trichlorophenol, stir, and after drying at room temperature, repeat the operation 3 times to obtain simulated soil polluted by trichlorophenol Sample 1120 grams. According to the test, the average concentration of trichlorophenol in the simulated soil sample is about 340mg / Kg dry soil sample. The simulated soil samples were randomly sampled, divided into three parts, each part was 100 grams, and two groups of experiments and blank control group experiments were carried out.

[0028] The selected surfactant is sucrose ester, which is made into a solution with a mass concentration of 1%. The degrading bacteria adopt the organic chloride CO bacterial agent of Guangdong Biwofeng Company. This bacterial agent cont...

Embodiment 2

[0033] In this example, the electrokinetic method is used to sequentially inject bioactive agents and biological strains into trichlorophenol-contaminated soil, so as to realize a combination of in-situ soil biosurfactant leaching and bio-spill method. The difference between this example and Example 1 is that the biosurfactant and the degrading bacteria are transported by electrokinetic method, and at the same time, the degrading bacteria are Dehalococcoides degrading bacteria provided by Geosyntec Corporation of the United States, and the actually polluted soil with trichlorethylene is used. , the concentration of pollutants is 450mg TCE / kg dry soil sample.

[0034] The trichlorethylene-contaminated soil was obtained from the former site of a chemical factory in a certain place in my country, and the soil sample was cohesive sandy loam. Use as attached figure 1In the soil experiment device shown, the anode 1 and the cathode 2 are placed on both sides of the device, and the e...

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Abstract

The invention provides a progressive repair method for soil polluted by chlorinated organic compounds. The repair method comprises the following steps: leaching the organic polluted soil by a water solution containing a bio-surfactant, and distributing most of persistent organic pollutants in the soil into a leaching solution; after finishing leaching, adding microbial degrading bacteria, and realizing the sustainable degradation of low-concentration organic compounds. The residual bio-surfactant cannot perform a negative function on the subsequent biodegradation of the organic pollutants, and can be used as a carbon source and be utilized by microorganisms. The bio-surfactant is used as a leaching agent, the organic pollutants are progressively degraded by a microorganism process, and the problems that the soil polluted by high-concentration chlorinated organic compounds is difficult to repair, traditional bio-surfactant produces residual toxicity, and the like are solved.

Description

technical field [0001] The invention belongs to the field of environmental protection and relates to a method for cascadingly repairing soil polluted by chlorinated organic matter. Background technique [0002] In the process of rapid industrialization and urbanization, soil pollution has become an ecological and environmental issue of widespread concern to the society. Excessive heavy metals and organic pollutants (such as petroleum hydrocarbons, chlorinated organic solvents, pesticides, polychlorinated biphenyls, etc.) will destroy the normal operation of the soil ecosystem, and may seriously threaten human health through direct exposure or food chain transmission. Existing methods for remediating contaminated soil mainly include natural reduction, physical isolation, immobilization and stabilization, soil leaching, chemical redox methods, and biological methods. Biological methods have attracted widespread attention due to their environmental friendliness and low economi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/10
Inventor 毛旭辉高顺尹盘基
Owner WUHAN UNIV
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