An electrokinetic-permeable reactive wall joint remediation method for heavy metal-contaminated soil

Abstract

The invention belongs to the technical field of remediation of polluted soil, and in particular relates to a joint repair method of electrodynamic-permeable reaction walls for heavy metal polluted soil, in which a positive electrolytic cell and a negative electrolytic cell are arranged within a certain distance, and an electrolytic cell is arranged at a place where heavy metals of pollutants are enriched. The permeable reaction wall is connected to the power supply to perform electrodynamic restoration of the polluted soil. The permeable reaction wall is filled with adsorption materials, and the adsorption material is a three-layer coating structure: the innermost core layer is reduced iron and biological bacteria agent, The core layer is wrapped with an iron-loaded modified montmorillonite middle layer, and the middle layer is wrapped with a biochar outer layer. In the joint repair method of the present invention, the adsorption material used in the permeable reaction wall is a three-layer coating structure, and the zero-valent iron and biological bacteria agent with unstable performance are coated, which can effectively improve its stability and utilization rate, and has the advantages of High practical value and broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of remediation of contaminated soil, in particular to an electrokinetic-permeable reaction wall combined remediation method for heavy metal contaminated soil. Background technique [0002] Remediation technologies for contaminated soil include guest soil method, solidification-stabilization method, leaching method, chemical oxidation method, thermal desorption method, plant method, electrodynamic remediation method, permeable wall method, etc. Due to the differences in the composition of polluted soil, pollutant types, properties, etc., especially in the case of compound pollution where different pollutants exist at the same time, it is often difficult for a single remediation technology to achieve the remediation goal. The combined application of electrodynamic remediation technology and other remediation technologies is increasingly popular Among them, the electrokinetic-permeable reactive wall (EKR-PRB) c...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the EKR-PRB coupling repair technology has the following problems in the application: due to its advantages such as small particle size, large specific surface area, high surface activity, and strong reducing ability, zero-valent iron used in PRB technology is filled with active reactive materials. However, due to the unstable performance of zero-valent iron, its properties are easily affected by external conditions, so the utilization rate of zero-valent iron is low in the application of filled active reactive materials used in practical PRB technology