影响铁渗透反应格栅修复地下水中氯代烃长期运行性能的研究进展

The factors impacting on long-term performance of iron permeable reactive barriers for remediation of chlorinated hydrocarbons in groundwater:A review

铁渗透反应格栅技术修复地下水中氯代烃,尤其是四氯乙烯和三氯乙烯,已日臻成熟;近年,研究者对该技术的关注已集中到影响格栅长期运行性能的因素上。文章从地下水的常量化学组分、铁表面形成的矿物沉淀、铁渗透反应格栅中的微生物和共存有机污染物4个方面,对影响其长期运行性能的因素进行了综述。分析表明,铁表面矿物的长期积累是降低格栅长期运行性能的主要因素,并对该技术的发展进行了展望。

Iron-based permeable reactive barriers（Fe0-PRBs） for in-situ groundwater remediation of chlorinated hydrocarbons such as perchloroethylene and trichloroethylene have become a mature technology.Results published recently focus on the evaluation of long-term performance of Fe0-PRBs.This paper reviews the factors impacting on the long-term performance of Fe0-PRBs in treating chlorinated solvents,including groundwater chemistry,mineral precipitates formed on iron surface,microbes within Fe0-PRBs and other coexistent organic pollutants.It is mineral precipitates accumulating within Fe0-PRBs that become the predominant factor to decrease barriers＇ reactivity over time.Moreover,future research on multimedia permeable reactive barriers and sequential ones based on Fe0-PRBs have been recommended.