Dechlorination of trichloroethylene by Fe(II) associated with hematite/CaO

ENVR 127

Wan-Hyup Kang, wkang@civil.tamu.edu, Department of Civil Engineering, Texas A&M University, 3136 TAMU, College Station, TX 77843, Inseong Hwang, ihwang@pusan.ac.kr, Department of Environmental Engineering, Pusan National University, 30 Jang Jeon-Dong, Geum Jeong-Gu, Busan, South Korea, and Joo-Yang Park, jooypark@hanyang.ac.kr, Department of Civil Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-Gu, Seoul, South Korea.
Kinetic studies of TCE in the iron oxides/CaO containing Fe(II) were investigated to identify the reactive agents for TCE degradation in cement/steel slag/Fe(II) systems. Through screening experiments, hematite/Fe(II) were chosen because it showed better TCE removal efficiencies than other systems, such as goethite with Fe(II), maghemite with Fe(II) and magnetite with Fe(II). The efficiency and rate of TCE dechlorination by Fe(II) associated with hematite increased greatly when CaO was present. Also, the reactivities observed in the hematite/CaO/Al2O3/Fe(II) system are comparable with those reported for cement/Fe(II) or steel slag/Fe(II) systems containing similar molar amounts of Fe(II). It shows that the reactive agents for reductive dechlorination of TCE in cement/Fe(II) or steel slag/Fe(II) systems are similar to reactive agents generated in the combination between hematite/CaO/Al2O3/Fe(II). These results indicate that CaO, Fe(II) and Fe(III) minerals in cement/Fe(II) systems or steel slag/Fe(II) systems could be parts of reactive agents for reductive dechlorination of TCE.
 

General Papers
6:00 PM-8:00 PM, Wednesday, August 22, 2007 BCEC -- Exhibit Hall - B2, Poster

Division of Environmental Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007