Critical Review of Electro-kinetic Remediation of Contaminated Soils and Sediments: Mechanisms, Performances and Technologies

Ding Han, Xingyi Wu, Rui Li, Xianqiang Tang, Shangbin Xiao, Miklas Scholz

Research output: Contribution to journalReview articlepeer-review

Abstract

Remediation of contaminated soil and sediment is important for improving the eco-environmental quality. Electro-kinetic remediation (EKR) is an environmentally friendly technology to migrate and remove pollutants from the soil and sediment matrix. This paper analyses the mechanism and performance of EKR of heavy metals, organic pollutants, and compound pollutants. Moreover, the effect of optimizing individual EKR through soil and sediment pre-treatment (adding acid/oxidant/co-solvent/surfactant, stirring, heating, etc.), electrode optimization (exchange electrode, anode approximation, electrode matrix, etc.), and applying multi-technology combination (electro-kinetic permeable reaction barrier/Fenton/ion, exchange membrane/ultrasonic/electrolyte enhancement, etc.) was evaluated. Factors including incomplete separation of pollutants, variation in physico-chemical properties and microstructure of soil/sediment, and difficulties in in situ practice have restrained the field application of EKR. To solve the above technical challenge, an integrated EKR technology based on pollutant in situ separation, followed by separated contaminant treatment, and subsequent valuable elements recovery is proposed.

Original languageEnglish
Article number335
JournalWater, Air, and Soil Pollution
Volume232
Issue number8
DOIs
Publication statusPublished - 2021 Aug

Subject classification (UKÄ)

  • Other Environmental Engineering
  • Environmental Sciences

Keywords

  • Electro-kinetic remediation
  • Electrode
  • Enhanced method
  • In situ separation
  • Pore water
  • Soil pollution

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