1. Assistant Professor, Dept. of Environmental Science, Tung Hai Univ., Mailbox 818, 181 Taichung-Kang Rd., Sec. 3, Taichung 40744, Taiwan, Republic of China.
2. Professor, Institute of Environmental Engineering, National Chiao Tung Univ., Hsinchu 30050, Taiwan, Republic of China.
3. Doctoral Student, Dept. of Biological Science and Technology, National Chiao Tung Univ., Hsinchu 30050, Taiwan, Republic of China.