摘要
因暴露于农业和工矿业等来源的各类污染物,地下水资源受到严重威胁。可渗透反应墙(Permeable reactive barrier,PRB)是一种地下水污染原位修复的创新技术,该技术的关键在于选取适宜的墙体反应介质,如广泛研究的零价铁(ZVI)、碳材料、沸石等。介绍了PRB技术的原理、介质材料类型与选取所需考虑的因素;回顾了含铁、含碳和含硅(矿物)组合材料应用于PRB修复地下水污染的研究进展,并聚焦了批量实验和柱试验中目标污染物的去除效果及作用机理。通过固定、表面修饰与混合等方式,组合材料在一定程度上可解决ZVI的聚集或表面钝化现象,并新增作用机制以助力污染物的去除;通过改性或混合等形式,组合材料还可增强含碳或含硅(矿物)材料对某些特定污染物的去除性能。最后,还展望了未来PRB技术中组合材料的开发和应用方向,以期为研发长效和环境友好型PRB反应介质提供参考。
Groundwater resources has been under serious threat due to their exposure to contaminants emanating from a variety of sources including agriculture,industries,and mines.Permeable reactive barrier(PRB)is an innovative technology for in-situ remediation of contaminated groundwater,the key of which is the choice of suitable reactive materials,such as widely applied zero valent iron(ZVI),carbon materials and zeolite.In this paper,the principle of PRB,types of reactive materials,and factors influencing the choice of reactive media,were introduced.Recent findings of combined materials containing iron,carbon and silicon(minerals)applied in PRB for the remediation of groundwater were reviewed,and the removal efficiency and mechanism of target pollutants in batch and column experiments were highlighted.Aggregation and passivation of ZVI could be solved to some extent in the combined materials by fixation,surface modification or mixing,and new interaction mechanisms might be introduced to facilitate the removal of pollutants.By means of modification or combination,removal potential of carbon-or silicon(minerals)-containing materials for specific pollutants could be enhanced.Finally,the future development and application of combined materials in PRB technology were prospected,collating references for development of long-term efficient and environmentally friendly PRB reactive materials.
作者
李亮
徐建
LI Liang;XU Jian(Nanjing Institute of Environmental Sciences,Ministry of Ecology and Environment,Nanjing 210042,China;State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control,Nanjing 210042,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2023年第2期53-60,共8页
Industrial Water Treatment
关键词
地下水污染
可渗透反应墙
组合材料
修复
groundwater contamination
permeable reactive barrier
combined materials
remediation
