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

A technology for infiltrating reaction walls and polluted soil, which is applied in the field of polluted soil remediation, can solve the problems that properties are easily affected by external conditions, the performance of zero-valent iron is unstable, and the utilization rate of zero-valent iron is low, and the stability and utilization rate are improved. , low cost, high repair efficiency

Active Publication Date: 2021-07-30
迪天环境技术南京股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] An electrodynamic-permeable reaction wall joint restoration method for heavy metal polluted soil, in which a positive electrolysis cell and a negative electrolysis cell are set within a certain distance, a permeable reaction wall is set at the place where heavy metals in pollutants are enriched, and the polluted soil is connected to the power supply. Electric repair, the permeable reaction wall is filled with adsorption material, the adsorption material is a three-layer coating structure: the innermost core layer is reduced iron and biological bacteria agent, and the core layer is wrapped with iron-loaded modified montmorillonite The middle layer of soil is wrapped with the outer layer of biochar. Apply voltage to the two electrodes. After electrification, the heavy metals in the soil migrate to the cathode under the action of electromotive force, and are adsorbed and fixed by the permeable reaction wall in front of the cathode; remove the permeable reaction wall that ad...

Embodiment 2

[0056] An electrodynamic-permeable reaction wall joint restoration method for heavy metal polluted soil, in which a positive electrolysis cell and a negative electrolysis cell are set within a certain distance, a permeable reaction wall is set at the place where heavy metals in pollutants are enriched, and the polluted soil is connected to the power supply. Electric repair, the permeable reaction wall is filled with adsorption material, the adsorption material is a three-layer coating structure: the innermost core layer is reduced iron and biological bacteria agent, and the core layer is wrapped with iron-loaded modified montmorillonite The middle layer of soil is wrapped with the outer layer of biochar.

[0057] The adsorption material has a three-layer coating structure, and the unstable zero-valent iron and biological bacteria are coated to effectively improve its stability and utilization. Firstly, the reduced iron and biological bacteria agent are evenly mixed with kitche...

Embodiment 3

[0079] An electrodynamic-permeable reaction wall joint restoration method for heavy metal polluted soil, in which a positive electrolysis cell and a negative electrolysis cell are set within a certain distance, a permeable reaction wall is set at the place where heavy metals in pollutants are enriched, and the polluted soil is connected to the power supply. Electric repair, the permeable reaction wall is filled with adsorption material, the adsorption material is a three-layer coating structure: the innermost core layer is reduced iron and biological bacteria agent, and the core layer is wrapped with iron-loaded modified montmorillonite The middle layer of soil is wrapped with the outer layer of biochar.

[0080] The biological bacteria agent comprises the following components by weight: 4 parts of waste brewer's yeast, 2 parts of bacillus and 3 parts of sulfate-reducing bacteria.

[0081] Described biochar is kitchen waste biochar, prepared by the following method:

[0082] ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/10B09C1/00
CPCB09C1/00B09C1/08B09C1/085B09C1/10
Inventor 王帘里秦丰林张慧
Owner 迪天环境技术南京股份有限公司
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