Effect of reversed-Direct current in combination of electrokinetic and PRB on remediation of TCE-contaminated soil

Remediation of soils contaminated with chlorinated hydrophobic organic compounds (CHOCs) remains a challenge for environmental scientists worldwide. In the present study electrokinetic technology wascoupled with permeable reactive barrier (PRB) composed of micro-scale Fe to treat a Tetrachloroethylene(TCE)-contaminated soil. A nonionic surfactant, Triton X-100, was selected as the solubility enhancing agent. Four bench-scale tests (T1 to T4) were conducted to investigate the effect of revised direct current in EK-PRB method on removal of TCE-contaminated soil under potential gradient of 1 V.cm-1 for 10days. Cumulative electro-osmosis flow, electrical current and pH in anode and cathode reservoir weremeasured every 24h during the run. In T4, direction of current was reserved after 5 day for investigation of TCE-remove in the cathode column by Fe-PRB method. Results showed that the TCE removal was generally increased in anode and cathode by revised current in EK-PRB test compared with EK-PRB test without revised current (73% in anode, 64% in cathode versus 24% in anode and 18% in cathode).

کلیدواژه ها:

Electrokinetic ، Tetrachloroethylene ، Surfactant ، Permeable Reactive Barrier