污染地下水原位治理技术--透水性反应墙法

20世纪90年代初期在美国和加拿大兴起的原位被动修复技术--透水性反应墙,是一种地下水污染原位处理方法.其通过在垂直于地下水流动方向设置活性渗滤墙,当地下水流通过活性渗滤墙时,污染物与墙体材料发生化学反应,从而达到环境修复的目的.该技术具有原理简单,施工方便,能持续原位处理,处理组分多,且运行费用低廉等特点,能有效吸附和降解多种重金属和有机污染物.该方法目前在欧美已开始进入广泛的工程应用阶段,正逐步取代运行成本昂贵的抽水处理技术,成为地下水修复技术的发展方向.系统介绍了透水性反应墙法,阐述了反应墙的类型、活性材料的选取、反应机理、反应墙的构建以及应用实例,同时分析了其存在问题并展望其今后的研究方向.

In situ remediation of contaminated underground water: permeable reactive barrier

Permeable reactive barrier is an emerging approach in America and Europe to in situ remedy the polluted underground water system. Reactive material is placed in the subsurface where a plume of contaminated groundwater flows through under its natural gradient, creating a passive treatment system, and treated water comes out from the other side after adsorption. Compared with the earlier method, PRB is characterized by its good long-term performance and effective removal of contaminants. The installation of PRB is relatively simple and convenient. After properly designed and installed, PRB are capable of remedying a number of contaminant with extremely low maintenance costs. It has widely been used in practical projects in America and Europe. In this paper, the technology is introduced, including the types, medium selection, mechanism, building of PRB, application limits and conditions and existing problems. A probe to the future development of this technology is made as well.