Abstract
The combination of electrokinetic remediation and permeable reactive barrier (EK-PRB combined remediation technology) is a new green technology for in-situ removal of soil and groundwater pollutants. This technology combines the advantages of electrokinetic remediation and permeable reactive barrier technology, and can deal with different types of organic and inorganic pollutants. It has the characteristics of convenient installation, simple operation, no secondary pollution, etc., and has broad development and application prospect. This paper introduces the technical principle of EK-PRB, summarizes the latest research results on the remediation of heavy metal, organic matter and nitrate contaminated soil and groundwater by the electrokinetic remediation and PRB. Finally,the technical problems of combinated remediation were pointed out, and development and application direction of this technology was noted.
Highlights
The pollution of groundwater and soil in China is very serious, the main pollutants are heavy metal ions and toxic and harmful organic compounds
The combination of electrokinetic remediation technology and permeable reaction barrier (EK-PRB) technology is the combination of electric remediation technology and permeable reaction barrier (PRB) technology Combined with the advantages of electric and permeable reaction grid technology, this technology can repair the inorganic and organic contaminated soil in situ at the same time
The successful application of this technology is due to two reasons: first, the pollutant moves in a directional direction under the action of external electric field, so that PRB can operate under the action of hydraulic gradient; second, the adsorption of pollutant by PRB reaction medium can effectively reduce or prevent the pollution of external electrode
Summary
The pollution of groundwater and soil in China is very serious, the main pollutants are heavy metal ions and toxic and harmful organic compounds. What's more, this technology has a strong ability to repair the poor permeable contaminated soil, which is not affected by the site, temperature and other factors, and it can effectively prevent the secondary pollution caused by restoration, and the cost of restoration is relatively low. This technology is becoming a research hotspot in the field of soil environmental remediation at home and abroad [9,10,11,12]. The principle and application of ek-prb technology are reviewed in detail
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