Remediation agent for leaching soil polluted by heavy metal chrome

A technology for chromium-contaminated soil and heavy metals, applied in the restoration of contaminated soil, etc., can solve the problems of severe soil heavy metal pollution, poor alkaline soil effect, unsuitable for on-site operation, etc., and achieve strong biodegradability and recovery Green vegetation, reducing the effect of bioavailability

Inactive Publication Date: 2011-11-23
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0004] At present, the heavy metal-contaminated soil remediation technologies mainly include phytoremediation, electrodynamic remediation, leaching, thermal desorption, vitrification, and solidification and stabilization. Among the above heavy metal-contaminated soil treatment methods, phytoremediation requires considerable It takes a long time (decades or even hundreds of years) and there are problems with the treatment of plants; electrokinetic restoration is only suitable for small areas of pollution, and it is not easy to operate on site; thermal desorption is a method of recovering gas by heating, which is not suitable for on-site T

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: In the treatment of hexavalent chromium-contaminated soil, the content of leaching agent added per kilogram of soil is: 0.1mol / L citric acid 10L, pyrolusite 1g, after using this embodiment, hexavalent chromium 86 can be leached out %, effectively reducing the content of hexavalent chromium in polluted soil.

Embodiment 2

[0019] Embodiment 2: In the treatment of trivalent chromium-contaminated soil, the content of leaching agent added per kilogram of soil is: 0.1mol / L citric acid 10L, pyrolusite 5g, after using this embodiment, trivalent chromium 32 can be washed out %, effectively reducing the content of trivalent chromium in polluted soil.

[0020] The leaching agent for heavy metal chromium polluted soil of the present invention can significantly reduce the content of heavy metal chromium in the soil, can realize the rapid restoration of heavy metal chromium polluted soil, reduce the harm of heavy metal pollution to the soil environment, thereby reducing the bioavailability of plants to heavy metals, preventing Heavy metals enter the food chain.

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PUM

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Abstract

The invention relates to a remediation agent for leaching soil polluted by heavy metal chrome. The invention belongs to the technical field of heavy-metal-polluted soil remediation. The remediation agent comprises mixed components of, by weight: 95% to 99% of citric acid and 1% to 5% of pyrolusite. The leaching agent provided by the invention has advantages of low raw material cost, high remediation speed, good effect, and easy recycling of waste liquid.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal-contaminated soil, in particular to the formulation of a washing agent for heavy metal-chromium-contaminated soil. Background technique [0002] At present, the area of ​​soil polluted by heavy metals in China is at least 20 million hectares. According to the national survey of sewage irrigation areas conducted by the Ministry of Agriculture of China, in the sewage irrigation areas of about 1.4 million ha, the area of ​​land polluted by heavy metals accounts for 64.8% of the area of ​​sewage irrigation areas. Heavy metal pollution comes from a wide range of sources, such as unreasonable discharge of "three wastes" in mineral processing and smelting, electroplating, batteries, chemicals, dyes and other industries, sewage irrigation, sludge fertilization, vehicle exhaust emissions in urban transportation, improper disposal of electronic waste, etc., will lead to Heavy metal pollut...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 曹宏斌杨秀红郭涛
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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