1. Department of Environmental Engineering; Daegu University, Jillyang; Gyeongsan Gyeongbuk 712-714 South Korea
2. School of Civil, Environmental and Architectural Engineering; Korea University; Anam-dong Seongbuk-gu Seoul 136-713 South Korea
3. Center for Material Cycles and Waste Management Research; National Institute for Environmental Studies, Onogawa; Tsukuba Ibaraki 305-8506 Japan