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Chemical-biological combining method used for repairing Cd pollution in soil

A repair method and soil technology, which is applied in the restoration of polluted soil, etc., can solve the problems of easy damage to the soil, long repair cycle, secondary pollution, etc., and achieve the effect of beautifying the urban environment, small amount of engineering, and short cycle

Inactive Publication Date: 2014-10-01
CHANGZHOU UNIV
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Problems solved by technology

Although the physical restoration method has high efficiency, it consumes a lot of energy and the soil is easily damaged. Although the chemical restoration method is effective, it is prone to secondary pollution. Although the biological restoration method has certain effects and is green and environmentally friendly, the restoration period is long

Method used

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Embodiment Construction

[0024] Before using the combined chemical-biological remediation method for soil Cd pollution of the present invention to remediate the contaminated soil, first collect a relocated chemical pollution site in Changzhou City as a research area to detect its physical and chemical properties, and arrange the plots according to the grid The method of setting the sampling points satisfies the universality of the test data. Soil samples were collected in accordance with the "Technical Specifications for Soil Environment Monitoring" (HJ / T166-2004) and other standards. The surface soil (0-40cm) was collected at each sampling point. Remove the part of the sample that is in contact with the metal sampling device and put it into a special sample bag to avoid contact contamination between samples. After all samples are collected, store them in the refrigerator.

[0025] Then the various forms of Cd in the sampled soil were detected: using step-by-step continuous extraction, the Tessier me...

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Abstract

The invention provides a chemical-biological combining method used for repairing Cd pollution in soil. The method comprises the following steps: compounding a citric acid solution 0.6mol / L, a Beta-cyclodextrin solution 20g / L and a rhamnolipid solution 10g / L, or compounding any two of the solutions; adjusting the pH value ranging from 3 to 6 through a nitric acid solution or a sodium hydroxide solution to acquire a leachate a and a leachate b. Combined with chemical elution and phytoremediation, the chemical-biological combining method used for repairing the Cd pollution in the soil repairs the soil polluted by Cd, and has an obvious eliminating effect on the exchangeable form of the Cdi in the soil and the combining form of carbonate, particularly the combining form of iron and manganese oxides; the repairing method can be applied to repairing large-scale polluted sites in city; the engineering quantity is small, the cost is low and the period is short; moreover, the environment of the city can be beautified when the environment is repaired, and no secondary pollution is generated to the soil; besides, the chemical-biological combining method does not have an effect on the activity of the soil, and the repairing rate can reaches above 92%.

Description

technical field [0001] The invention relates to a treatment technology for soil heavy metal cadmium (Cd) pollution, in particular to a combined chemical-biological repair method for soil Cd pollution, which is suitable for repairing large areas of land polluted by Cd. Background technique [0002] Heavy metal cadmium (Cd) is often used in the manufacture of alloys, pigments, plastic stabilizers, (TV image tube) phosphors, insecticides, fungicides, paints, rechargeable batteries, etc., especially in the electroplating industry, due to its high oxidation point, being widely used. [0003] With the acceleration of industrialization and urbanization in my country, a large number of enterprises that are closed, relocated or about to be decommissioned have appeared. These enterprises have caused serious site pollution problems due to factors such as product production and treatment, waste dumping and discharge, among which soil Cd The treatment of polluted sites has become a hot i...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 李定龙吕浩杨彦万玉山
Owner CHANGZHOU UNIV
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