1. Ph.D. Student, Dept. of Environmental Engineering, National Chung Hsing Univ., Taichung 402, Taiwan (corresponding author).
2. Associate Professor, Dept. of Environmental Engineering, National Chung Hsing Univ., Taichung 402, Taiwan.
3. Master, Dept. of Environmental Engineering, National Chung Hsing Univ., Taichung 402, Taiwan.
4. Ph.D. Student, Dept. of Environmental Engineering, National Chung Hsing Univ., Taichung 402, Taiwan.