1. Department of Environmental Engineering, Vanung University, Chung-Li, Tao-Yuan, 32061, Taiwan, Republic of China. Phone: 886-3-4342379, ext. 44; Fax: 886-3-4622232; E-mail: hohc@msa.vnu.edu.tw
2. Department of Water Resources and Environmental Engineering, Tamkang University, Tamsui, Taipei, 25137, Taiwan, Republic of China.
3. Department of Environmental Engineering, Vanung University, Chung-Li, Tao-Yuan, 32061, Taiwan, Republic of China.