PRB修复重金属污染地下水的反应介质研究进展

摘要

可渗透反应墙(permeablereactivebarrier,PRB)技术作为一种经济、简易、高效的原位被动修复技术逐渐被广泛研究和应用.其关键技术是反应介质的研究,修复重金属污染地下水的PRB反应介质材料细分为氧化还原反应介质、吸附反应介质、沉淀反应介质和混合反应介质等四类,对反应介质的去除机理、应用现状和存在问题进行了综述.可渗透反应墙介质材料的选择应在其反应机理的基础上,结合当地水文地质条件、污染特征和经济费用等加以综合考虑,以保证PRB的长效性.未来PRB反应介质的发展主要集中于复合介质和新型反应介质的开发、反应介质的性能研究.同时,我国对PRB修复重金属污染地下水反应介质的研究还处于实验阶段,应进一步加强工程应用.%As a cost-efficient,simple and in-situ passive remediation technology for the treatment of polluted groundwater,the permeable reactive barrier (PRB) has gradually been widely used and studied.The key to PRB technology is research of reaction medium and the reactive media in PRB could be divided into reduction type,absorbent type,precipitation type and mix type.The removal mechanism,current situation and existing problems of the reaction medium used to remove the heavy metals in groundwater are reviewed.To ensure the long-term efficiency of the PRB,the selection of reactive medium in PRB should be based on the reaction mechanism,while the local hydrogeological conditions,the pollution characteristics and economic costs should be comprehensively considered.Development of the reaction media should be focused on the exploration and performance research of mixed and new media.Meanwhile,the study of reactive medium is still being in the laboratorial stage,engineering application research should be further strengthened.