Process for united repairing heavy metal polluted soil by electric power and iron permeable reaction lattices

A technology of combined restoration of contaminated soil, applied in the restoration of contaminated soil, etc., can solve problems such as poor soil fluidity, and achieve the effect of avoiding secondary pollution and reducing changes

Inactive Publication Date: 2010-08-11
NANKAI UNIV
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Problems solved by technology

[0005] In order to overcome the shortcomings of poor soil mobility of heavy metals and electrodynamic restoration of heavy metal-contaminated soil remediation technology, the present invention provides a soil remediation technology that can quickly and efficiently remediate heavy metal-contaminated soil and avoid secondary pollution to water bodies

Method used

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  • Process for united repairing heavy metal polluted soil by electric power and iron permeable reaction lattices

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Embodiment 1

[0021] Potassium dichromate (K 2 Cr 2 o 7 ) Make unpolluted soil (chromium background value 92mg / kg) into contaminated soil containing chromium (VI) 1000mg / kg, repair it with the combined technology of electric power and iron PRB as shown in Figure 1, and spread it under the contaminated soil 1 A layer of anti-seepage layer 10, sand 2 is vertically placed on both sides of the chromium-contaminated soil, followed by iron walls (PRB) 3 and electrodes 4 . The electrode chamber 5 is filled with water from the water inlet 6 and discharged from the water outlet 7. The water inlet and discharge are controlled by the water valve. The exhaust gas generated in the electrode chamber 5 is controlled by the air valve, and is transported to the exhaust gas treatment tank 12 through the exhaust port 8 for treatment. emission. The electrode 4 is connected with the anode output and the cathode output port of the DC transformer 13 through the terminal 9 . In order to ensure the moisture con...

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Abstract

The in-situ efficient heavy metal polluted soil repairing technology without secondary pollution is to combine electric power and in-situ PRB technology. Graphite electrodes are mounted on two sides of the polluted soil and PRB is set inside the soil between these two electrodes, so that under the action of the electric field, metal anions, such as Cr ion can migrate to anode, metal cations, suchas Cd2+ and Hg2+ can migrate to cathode and heavy metals can react with PRB to be adsorbed, reduced and precipitated. The said technology can eliminate polluting heavy metals from soil completely, avoid the secondary pollution to water and reduce the changes of soil in physical and chemical properties.

Description

technical field [0001] The invention relates to an in-situ, high-efficiency, and non-secondary pollution repairing technology for heavy metal polluted soil. Background technique [0002] With the rapid development of global industry, harmful heavy metals enter the soil through various channels, causing pollution. Soil pollution not only affects the yield and quality of crops, but also causes groundwater pollution, endangering human health. According to reports, the world's average annual emissions of Hg are 1.15 million tons, Mn is 15 million tons, Cu is 3.4 million tons, Pb is 5 million tons, and Ni is 1 million tons. In my country, 750,000 to 900,000 tons of chromium-containing waste residues are produced every year, and the accumulated chromium residues are not less than 2 million tons. About 30,000 hectares of land are polluted by mercury, and more than 10,000 hectares of land are polluted by cadmium. The amount of cadmium rice produced is more than 50,000 tons, and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/08
Inventor 孙红文张瑞华
Owner NANKAI UNIV
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