Remediation of Dioxins-Contaminated Soil by Successive Ethanol Washing-Photodegradation

摘要

We investigated a combined process for remediating dioxins-contaminated soil (i.e.,initial concentration approx= 9100 pg-TEQ/g) involving solvent washing followed by UV irradiation.More than 95.1% of TEQ was removed from the soil under a pseudo-first order by performing ethanol washing seven times,and the resulting TEQ removal efficiency of ethanol washing solution (i.e.,initial concentration = 2468.5 pg-TEQ/mL) after 16 h of UV irradiation was 99.8%.In addition,most of the PCDDs/DFs peaks disappeared based on HRGC-MS chromatography.These results indicate that the proposed ethanol washing-UV irradiation treatment can be effectively applied in remediating dioxins-contaminated soil.