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Chemical-biological combination repair method for Cd-B [a] P compound contaminated soil

A remediation method and composite pollution technology, which is applied in the field of remediation of polluted soil, to achieve the effect of beautifying the urban environment and good remediation effect

Active Publication Date: 2014-12-31
GUANGDONG UNIV OF TECH +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, the combined chemical-biological remediation technology for large-area Cd-B[a]P compound polluted soil is still relatively rare.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] Sample Collection

[0030] Taking a relocated chemical pollution site in Changzhou City as the research area, 15 sampling points were set up on the plot according to the grid layout method, and soil samples were collected according to the "Technical Specifications for Soil Environment Monitoring" (HJ / T166-2004) and other standards. About 1 kg of surface soil (0-40 cm) was collected at each sampling point, and the part in contact with the metal sampling equipment was removed from the sample, and put into a special sample collector. Take 5kg of soil for experimental research, and keep it sealed in a cool place.

[0031] Sample testing

[0032] The various forms of heavy metal Cd in soil samples were detected: the step-by-step continuous extraction method was used to extract the exchangeable state, carbonate binding state, iron-manganese oxidation state, organic state and residue state by Tessier method. Specifically, take an appropriate amount of sampled soil, air-dry i...

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Abstract

The invention provides a chemical-biological combination repair method for Cd-B [a] P compound contaminated soil, and the method includes the following steps: A) using 0.6mol / L citric acid solution, 20g / L beta-cyclodextrin solution and 10g / L rhamnolipid solution or any two of the solutions for compounding, using nitric acid or calcium hydroxide to adjust the pH value to 3-6 to prepare an eluent a and an eluent b; according to the chemical-biological combination repair method for the Cd-B [a] P compound contaminated soil, the Cd-B [a] P compound contaminated soil is treated by combination of chemical elution and animal and plant repair, exchangeable state, carbonate bounded state, iron and manganese oxidation state, organic state and B (a) P free dissolved state of Cd in the soil can be obviously removed, the repair method is economical, good in repair effect and suitable for use in restoration of soil in large area Cd-B [a] P compound contaminated sites, while restoration, the city environment is beautified without secondary pollution on soil, and the repair rate can reach more than 92%.

Description

technical field [0001] The invention relates to the technical field of remediation of polluted soil, in particular to a combined chemical-biological remediation method of Cd-B[a]P composite polluted soil. Background technique [0002] In recent years, with the acceleration of my country's industrialization and urbanization process, a large number of chemical companies have been closed, relocated or about to be decommissioned. These chemical companies have caused considerable damage due to factors such as product production and treatment, waste dumping and discharge, and chemical substance leakage. The serious site pollution problem has had a great impact on human health and environmental safety. [0003] Some researchers investigated the pollution status of the soil near the industrial abandoned area in Liaoyang, the old electronic processing plant in Wenzhou, and a steel company in the suburbs of Nanjing, and found that cadmium (Cd) and benzo(a)pyrene (B[a]P) were Its main ...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
Inventor 杨彦吕浩李定龙方慧
Owner GUANGDONG UNIV OF TECH
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