1. Professor, Institute of Environmental Engineering, National Sun Yat-Sen Univ., 70 Lien-hai Rd., Kaohsiung 804, Taiwan, Republic of China. E-mail: ms.chou@msa.hinet.net
2. Doctoral Student, Institute of Environmental Engineering, National Sun Yat-Sen University, 70 Lien-hai Rd., Kaohsiung 804, Taiwan, Republic of China. E-mail: d9133808@student.nsysu.edu.tw