Fe~0/Zn~0 PRB Technology for the Remediation of PCBs Contaminated Groundwater

摘要

The vast majority of PRB currently in use utilize zero valent iron (ZVI) as the reactive medium. In this paper, three laboratory columns were set up and operated under conditions simulating those anticipated in the groundwater to investigate the feasibility and efficiency of the enhanced Fe~0 PRB for the remediation of the PCBs contaminated groundwater. Operating under 10°C and an effective porosity of 61% to 67% and infiltration velocity of groundwater of 0.7 to 0.8m·d-1, the average iron concentration of effluent was 0.241mg·L~(-1), 0.129mg·L~(-1) and 0.201mg·L~(-1), respectively, and the average dechlorination efficiency reached 49.6%, 72.6% and 58.6%, respectively, the Fe~0/Zn~0 based columns can accomplish 94% of PCBs removal and pH value raised from 6.87 to 10.2. Comprehensive consideration suggested that Fe~0/Zn~0 based PRB technology is feasible for the remediation of PCBs contaminated groundwater.