Soil heavy metal remediation device with switchable array electrodes

Abstract

The invention relates to a transformable array electrode type remediation device for heavy metal polluted soil. The device is characterized in that a soil chamber is arranged around a central electrode chamber, and the soil chamber and the central electrode chamber form concentric circles; a PRB (Permeable reactive barrier) is arranged in the concentric circles in the direction vertical to the electric field direction, and the central electrode chamber and the PRB form concentric circles; the space between the central electrode chamber and a PRB body is filled with a medium filler; six hollowvertical column type anode chambers are uniformly distributed on a circular arc of the soil chamber and are treated as surrounding electrode chambers; filtering nets are attached to the soil chamber,the anode chambers, the PRB, and the inner walls, adjacent to cathode chambers, of the PRB; electrodes are arranged in the anode chambers and the cathode chambers. According to the device, the array electrode arrangement mode is adopted, so that the remediation efficiency is improved; the remediation period is reduced; the size of the electrode chamber is adjustable; the electrodes can move, thusthe device can be switched among different remediation ranges, and as a result, the practicability is high; the electric remediation mode and the PRB are combined, so that the heavy metal in the soilcan be efficiently removed.

Description

technical field [0001] The invention relates to soil pollution restoration of environmental technology, in particular to an EK-PRB restoration device for soil heavy metal pollution. Background technique [0002] Contaminated soil remediation has been paid more and more attention at home and abroad. In foreign countries, some technologies have entered the stage of engineering demonstration and application. At present, the main methods for dealing with heavy metal-contaminated soils include guest soil method, leaching method, solidification / stabilization method, phytoremediation method and electrodynamic remediation method. The engineering quantity of guest-soil method is large, time-consuming and labor-intensive. The leaching method and the solidification / stabilization method did not completely remove the heavy metals in the soil, which easily caused secondary pollution of the soil, and were not suitable for large-scale site restoration. Phytoremediation is generally time-c...

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Problems solved by technology

[0005] The repair effect of ordinary plate-shaped and single-pair electrodes is not ideal, considering that there are few variable factors and the distance from actual engineering repair is far away (plate-shaped electrodes are inconvenient to install, the repair range in engineering is large, and the actual electrode spacing of plate-shaped electrodes is large. It is difficult to achieve the repair effect of a uniform electric field), and other problems, the present invention provides an in-situ, efficient, and more practical repair technology of combined electromotive force and osmotic reaction walls under multiple pairs of electrodes-transformable array soil heavy metal repair device

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