1. Ph.D. Candidate, Dept. of Environmental Engineering and Sustainable Environment Research Center, National Cheng Kung Univ., 1 University Rd., Tainan 701, Taiwan. E-mail: p5891101@ccmail.ncku.edu.tw
2. Professor, Dept. of Environmental Engineering and Sustainable Environment Research Center, National Cheng Kung Univ., 1 University Rd., Tainan 701, Taiwan (corresponding author). E-mail: chuhsin@mail.ncku.edu.tw