地下水污染修复的活性渗滤墙技术

活性渗滤墙是一种现场修复受污染地下水的新型技术，具有原理简单，施工方便，运行费用低廉等特点，活性渗滤墙垂直于地下水流动方向设置，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。文中综述了活性渗滤墙技术的修复机理和实际应用，大量研究表明，应用金属铁作为活性渗滤墙材料，可以去除地下水中的重金属以及有机污染物，目前活性渗滤墙已经在世界各地应用，是一种非常有发展前景的环境污染修复技术。

Permeable Reactive Barriers for Remedy of Contaminated Groundwater

The permeable reactive barriers (PRB) system is a recently developed in-situ remedy technology for contaminated groundwater. The concept of PRB is relatively simple. 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 and reaction between contaminant and reactive material. After properly designed and conveniently installed, PRB are capable of remedying a number of contaminant with extremely low maintenance costs. Current research shows that iron metal can be used as the reactive material for converting heavy metal cations and halogenated hydrocarbons to immobile or non-toxic species. Now field projects are conducted in North American and Europe. The PRB system is a very promising remedy technology.