Repairing method for electric migration of surface layer soil heavy metal Cd to deep layer for fixation

A technology of surface soil and restoration method, which is applied in the restoration field of electrokinetic migration of heavy metal cadmium in surface soil to deep fixation, can solve the problems of verification, small experimental device, complicated experimental conditions, etc., and achieves the effects of reducing absorption, easy operation and environmental friendliness.

Inactive Publication Date: 2018-02-16
SOUTH CHINA AGRI UNIV
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Problems solved by technology

At present, most of the soil electric restoration experiments are simulated in the laboratory. The experimental devices are small (mos

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  • Repairing method for electric migration of surface layer soil heavy metal Cd to deep layer for fixation

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Embodiment 1

[0023] The implementation of the present invention is carried out in the laboratory, and the polluted soil is taken from Qingyuan City, Guangdong, where the heavy metal Cd exceeds the national soil quality standard, and the electric restoration technology is used for restoration. The specific measures are as follows:

[0024] (1) Collect farmland plow layer soil samples (0-20cm) around an electronic waste dismantling plant, air-dry them naturally, break the soil block with a rubber hammer until it passes through a 2mm sieve, and remove gravel, grass roots, and all sieved soil during this period Samples were stored in a desiccator for pH and heavy metal analysis.

[0025] (2) The experimental device adopts a plexiglass cylinder (inner diameter 11cm, height 50cm), the cathode adopts a circular aluminum plate (diameter 10cm, thickness 0.5cm), and a small hole is drilled on the edge for connecting copper wires, and the anode adopts a circular graphite plate ( Diameter 10cm, thickn...

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Abstract

The invention discloses a restoration method for electromotively transferring heavy metal cadmium in surface soil to deep fixation. The restoration method of the present invention is a vertical electrodynamic restoration. After the soil is saturated with water, the battery provides a DC power supply. The positive electrode graphite plate is placed directly on the top surface of the soil column, and the negative electrode aluminum plate is placed on the bottom of the soil column at a depth of 40 cm, and is supplemented by adding potassium fertilizer KCl. The electrodynamic repair effect can make more than 80% of Cd migrate to below 15cm, reduce the absorption of heavy metal Cd by crops, and form high pH soil in the 35-40cm soil layer, which can fix heavy metals without polluting groundwater. The method is simple to operate, does not need complex equipment, is easy to operate in the field, and is easy to apply and popularize. And it does not add non-agricultural chemicals to the soil, which is more friendly to the environment.

Description

technical field [0001] The invention discloses a technology for repairing heavy metal-contaminated soil. Specifically, the electrodynamic principle is used to repair heavy metal-contaminated soil and reduce the absorption of heavy metals by crops; in particular, it relates to a repair method for electric transfer of heavy metal cadmium in surface soil to deep fixation. Background technique [0002] Heavy metal pollution is a global concern. At present, the soil in many countries and regions in the world is polluted by heavy metals and organic matter. According to the survey of the national sewage irrigation area conducted by the Ministry of Agriculture of my country, one sixth of the agricultural soil has been polluted by heavy metals, and about 40% of the soil is being destroyed. Compared with the traditional in-situ restoration technology, electric restoration technology, as an emerging green technology, has attracted much attention because of its high efficiency, energy s...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/085B09C2101/00
Inventor 吴启堂马强卫泽斌李俊高婷龙新宪
Owner SOUTH CHINA AGRI UNIV
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