可渗透反应墙联用技术修复铬污染土壤地下水研究进展

Research Progress on Hyphenated Technique With PRB for Remediation of Chromium Contaminated Soil and Groundwater

可渗透反应墙技术(permeable reactive barrier,PRB)是一种能够实现铬污染土壤地下水持续原位处理的技术。传统PRB技术中以零价铁为填料的PRB技术应用最为广泛,但零价铁基PRB技术存在反应性差、钝化堵塞等问题。将其与电动修复技术、微生物修复技术等联用能够显著改善其反应效率、延长使用寿命,提高Cr(Ⅵ)的去除率,已经受到越来越多的关注。主要对近年来PRB技术与电修复技术及微生物修复技术联用处理Cr(Ⅵ)的研究进行了阐述,分别介绍了PRB-电修复技术、PRB-微生物修复技术以及三者联合处理技术的发展现状,联用技术的应用能够有效改善单一技术的缺陷,具有较好的应用前景,但目前对于联用技术的研究应用仍处于初步阶段,对于形成科学的修复体系并大规模应用于实地修复仍需进一步加以研究和探索。

The permeable reaction barrier(PRB)technology is a kind of technology which can realize continuous in situ treatment of chrome-contaminated soil and groundwater.Among the traditional PRB technologies,zero-valent iron is the most widely used filler,but PRB technology used zero-valent iron has some problems such as poor reactivity,passivation plugging and so on.The combination of it with electric repair technology and microbial repair technology can significantly improve the reaction efficiency,prolong the service life and increase the removal rate of Cr(Ⅵ),which has received more and more attention.In this paper,the research on the treatment of Cr(Ⅵ)by PRB technology combined with electrical repair technology and microbial repair technology in recent years is described.The development status of PRb-electrical repair technology,PRB-microbial repair technology and the combined treatment technology of the three technologies are introduced respectively.The application of combined technology can effectively improve the defects of single technology and has a good application prospect,but the research and application of combined technology is still in the initial stage.It still needs further research and exploration to form a scientific restoration system and large-scale application.