A device and method for electric repair-solidification combined treatment of heavy metal contaminated soil

Abstract

The invention discloses a device and method for electric repair-solidification joint treatment of heavy metal polluted soil, belonging to the field of repair and reinforcement of polluted soil. The device of the present invention can perform electrical restoration to reduce the concentration of pollutants in the soil, and then solidify the heavy metal ions through the curing agent, so as to achieve the dual function of first discharging the pollutants and then sealing them, and at the same time forms a solidified soil with a certain strength, which can be used for roadbed landfill, etc. project. Among them, the electric repair process includes three-stage repair: input deionized water electric repair in the early stage; electric repair with natural surfactant in the middle stage, and improve the removal rate with ultrasonic vibration; input curing agent slurry in liquid form in the later stage, and use electroosmotic flow to drive the curing agent reach the corresponding position in the soil. After the treatment is completed, the strength of the treated solidified soil can be tested by strength, and the reduction of pollutants, the storage effect and the uniformity of the distribution of the curing agent can be detected by the dynamic leaching method and the wave velocity method.

Description

technical field [0001] The invention belongs to the field of pollution restoration and reinforcement of polluted soil, and in particular relates to a device and method for electric restoration-solidification joint treatment of heavy metal-contaminated soil. Background technique [0002] The electrokinetic repair method utilizes the conductivity of the soil, inserts positive and negative electrodes into the soil and applies a direct current. Under the action of the electric field, the positive and negative charged particles in the soil move in opposite directions, driving the pore water in the soil and the dissolved in The cations in it move to the cathode, and then drive the heavy metal pollutants to transfer to the cathode area. However, traditional electrodynamic restoration methods often only reduce the concentration of pollutants in the soil to a certain value, and do not pay attention to the strength and durability of the treated soil. Therefore, the treated contaminate...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned problems such as the secondary diffusion of polluted soil, the concentration of pollutants interfering with the solidification treatment effect, and the low strength of the soil after treatment, the present invention provides a device and method for combined treatment of heavy metal polluted soil by electric restoration and solidification

Images