Rhamnoilpid-assisted electrokinetic remediation of cadmium contaminated soil
鼠李糖脂协助下的土壤中镉电动修复

The effect of rhamnoilpid,a biosurfactant,on electrokinetic remediation of cadmium(Cd)contaminated soil was investigated in this study.A range of laboratory experiments were conducted to determine characteristics and mechanisms of electrokinetic remediation of the contaminated soil under different conditions.The feasibility of using rhamnolipid as an additive was discussed as well.The results indicated that the rhamnolipid at pH=4.78 and different concentrations,in the range of 0.5~2 g/L,can be used as a cathode additive to improve the effect of electrokinetic remediation of Cd-contaminated soils through controlling soil pH values,increasing Cd accumulations(more than 4 times),increasing exchangeable Cd,and favoring secondary remediation.In additon,when the rhamnolipid(pH=4.78,0.5 g/L)was saturated with soil,there was no accumulation of Cd found in the soil,and 49.27% of Cd was removed.It is feasible to conduct electrokinetic remediation by usig rhamnolipid as the cathode additives.