Iron-based permeable reactive barriers (Fe°-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 Fe°-PRBs. This paper reviews the factors impacting on the long-term performance of Fe°-PRBs in treating chlorinated solvents, including groundwater chemistry, mineral precipitates formed on iron surface, microbes within Fe°-PRBs and other coexistent organic pollutants. It is mineral precipitates accumulating within Fe°-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 Fe°-PRBs have been recommended.%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.
展开▼
