kinetics of trichloroehtylene reduction by using nano-sized iron

Abstract

The remediation of groundwater contaminated caused by chlorinated organic compounds (PCE, TCE) is a demanding issue worldwide. These compounds are frequently found in groundwater of industrial complex, land fill site, and leaking tanks. To remove these chlorinated compounds, reliable cost-effective methods are needed, iron has been used in permeable reactive barrier (PRB) to treat chlorinated organic compounds. In this study, nano-sized zero valent iron (nZVI) was synthesized and used to test for reduction of trichloroethylene effectively. The addition of dithionite might reduce the amorphous iron oxide on the surface and make a magnetite. The magnetite increased the reaction rate for trichloroethylene, result in rapid dechlorination. In dithionite system, pickling water which is steel mill waste as well as ferric chloride was used in synthesis for nano sized iron particle as iron source. Each reaction rate using diverse Fe ion source, was also studied.Additionally, pilot scale synthesis of nano-sized iron was carried out form pickling water. . The synthesized nZVI was used for the degradation of TCE contaminated ground water in real site (Woo-san industrial complex). Pilot scale field assessment showed that such nanoparticles are easily delivered to the contaminated site as they are highly dispersed and mobile. This paper presents the progress and preliminary results of lab and field scale studies on the application of these novel nZVI particles for removal of recalcitrant pollutants from the environment.