ABSTRACT
The development of remediation technology of soil and groundwater contaminated with priority pollutants, including chlorinated compounds, inorganic ions, and heavy metals, has recently received much attention [1-6]. However, the contamination of soil and groundwater is enormous and difcult to clean up because of the inherent complexity of the soil and groundwater properties [7]. Several technologies, such as permeable reactive barriers (PRBs), in situ bioremediation, and air sparging have been applied for the remediation of contaminated soils and groundwater. Laboratory-scale and eld studies have demonstrated that PRBs packed with zerovalent metals (ZVMs) such as Fe, Cu, Al, Si, Zn, and Mg have been shown to be a promising strategy for the removal of organic and inorganic pollutants in contaminated subsurface environments [8-10]. Table 4.1 shows the reduction of priority pollutants by ZVMs under anaerobic conditions. Many halogenated hydrocarbons, including carbon tetrachloride (CT), tetrachloroethylene (PCE), and trichloroethylene (TCE), can be reductively degraded by ZVMs [9,11-13]. Of various materials used, zerovalent iron (ZVI) and bimetallic iron systems are the most often used materials because of their suitable redox potential for the reduction of halogenated compounds, no obvious toxic effect, and abundance in the earth’s crust.
