Method and device for repairing metal ions in contaminated soil

Abstract

The invention discloses a method and a device for repairing method ions in contaminated soil. According to the method, two repairing technologies of electrodynamics and electrospun nano-fiber membrane PRB (permeable reactive barrier) are combined to repair the metal ions in the contaminated soil. The device comprises a soil chamber, and an anode chamber and a cathode chamber which are respectively arranged at the two ends of the soil chamber, wherein a layer of electrospun nano-fiber membrane PRB is arranged between the soil chamber and the anode chamber as well as between the soil chamber and the cathode chamber; an anode is arranged in the anode chamber; a cathode is arranged in the cathode chamber; the anode and the cathode are respectively connected with the two ends of a direct-current power supply. According to the method and the device disclosed by the invention, the electrodynamics and the electrospun nano-fiber membrane PRB are combined, so that the mechanical strength and the chemical corrosion resistance of a PRB reaction medium are improved, and the metal ions in the contaminated soil can be removed effectively.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and relates to a method and a device for repairing metal ions in polluted soil, which can be used for repairing metal ions in soil polluted by coal gangue roadbed materials. Background technique [0002] Before the 1990s, excavation and landfill methods were mainly used to remediate heavy metal-contaminated soil. This method solidified the heavy metals in the soil to reduce their mobility and blocked the spread of pollution in a short time. There is still a certain risk of toxic components, which can easily damage the structure of the soil and reduce the fertilizer efficiency for plants, and the soil ectopic remediation method is likely to cause certain harm to the environment during the process of extracting soil. [0003] The subsequent electrokinetic technique is very effective for in situ remediation of heavy metals in soil, especially for remediation of low permeability soi...

AI Technical Summary

Problems solved by technology

[0002] Before the 1990s, excavation and landfill methods were mainly used to remediate heavy metal-contaminated soil. This method solidified the heavy metals in the soil to reduce their mobility and blocked the spread of pollution in a short time. There is still a certain risk of toxic components, which can easily damage the structure of the soil and reduce the fertilizer efficiency for plants, and the soil heterotopic restoration method is likely to cause certain harm to the environment during the process of extracting soil

However, Fe 0 It is easy to oxidize and generate Fe during the repair process 0 Derivatives, easy to affect the repair effect of electrokinetics on metal ions in soil, etc.

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