1. Department of Environmental Engineering, University of Seoul, 90, Jeonnong-dong, Dongdaemun-gu, Seoul, Korea, (E-mail: myong@uos.ac.kr; asknp@uos.ac.kr; shinho@ene.uos.ac.kr; chocolady99@hotmail.com)
2. Department of Water Pollution and Microbiology, National Institute of Environmental Research, 2-1 Site, Metropolitan Landfill Area, Kyungseo-dong, Seo-gu, Incheon, 404-170, Korea, (E-mail: rimyt@me.go.kr; purify@me.go.kr; hyenmic@me.go.kr)