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A system and method for deep layered treatment of heavy metal polluted soil

A technology for polluted soil and heavy metals, applied in the restoration of polluted soil and other directions, can solve problems such as increasing energy consumption in the restoration process, and achieve the effects of high removal efficiency of heavy metals, easy disposal, and improved solubility.

Active Publication Date: 2022-07-19
TSINGHUA UNIV
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Problems solved by technology

Excessive current will generate Joule heat to heat the soil and electrolyte, increasing the energy consumption of the restoration process

Method used

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  • A system and method for deep layered treatment of heavy metal polluted soil

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Embodiment 1

[0052] The experimental soil was kaolin, lead nitrate (Pb(NO) 3 ) 2 ) solution mixed with experimental soil to prepare artificially polluted lead soil. The artificially polluted soil was aged and air-dried for 2 weeks, and then collected and reserved for future use. The soil samples were digested with mixed acid, and the lead content in the artificially polluted soil was determined by ICP-MS, which was 47.4 mg / kg. The volume of the experimental device is 2m × 2m × 0.9m, and the volumetric density of the device is 0.8g / cm 3 , with a mass of 2880kg of heavy metal contaminated soil. According to the required remediation depth (0.9m) and soil heavy metal content (47.4mg / kg), the heavy metal enrichment degree was determined to be 2. According to the value of the enrichment degree of heavy metals, the soil was divided into two layers (the depth of each layer was 45 cm) for treatment. The first layer near the soil surface was the leaching treatment area, and the second layer was ...

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Abstract

The invention discloses a system and method for deep layered treatment of heavy metal polluted soil, comprising an electrode group, an additive spraying and collection system, and an adsorbent ring. The electrode set includes at least one set of electrode assemblies including anodes and cathodes, and a power source connecting the anodes and cathodes. The anode includes an anode insulating segment and an anode electrode segment, and the cathode includes a cathode insulating segment and a cathode electrode segment. When the cathode adopts a hollow tubular structure, the cathode is used as the liquid collector; when the cathode adopts a solid structure, the liquid collector is arranged between the cathode and the adsorption ring. The heavy metal contaminated soil site is divided into leaching treatment area and electric treatment area in depth and stratification, so that the anode insulation section and cathode insulation section are located in the depth range of the leaching treatment area, and the anode electrode section and the cathode electrode section are located in the depth range of the electric treatment area. . The invention can effectively improve the removal efficiency of heavy metals, and also has the advantages of low power consumption, low treatment cost, soil with a large depth, and the like.

Description

technical field [0001] The invention relates to a system and a method for deep layered treatment of heavy metal polluted soil, and belongs to the technical field of environmental protection. Background technique [0002] With the rapid economic development, the problem of soil environmental pollution has become increasingly prominent. Soil heavy metal pollution refers to the excessive deposition of metal elements with a density of more than 5.0 in soil due to human activities, resulting in soil heavy metal content significantly higher than its natural background value, resulting in ecological damage and deterioration of environmental quality. China's first soil census showed that in nearly 30% of the surveyed soil sites, lead, arsenic, cadmium, chromium, mercury, zinc, copper and other heavy metals exceeded the standard in nearly 30% of industrial wasteland and industrial parks. Unlike organic pollutants, most heavy metals are not affected by microbial and chemical degradat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/02B09C1/00B09C1/08
CPCB09C1/02B09C1/00B09C1/085B09C1/08B09C2101/00
Inventor 解宁由长福
Owner TSINGHUA UNIV
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