1. Postdoctoral Fellow, Institute of Environmental Engineering, National Sun Yat-Sen Univ., Kaohsiung 804, Taiwan.
2. Professor, Director, Institute of Environmental Engineering, National Sun Yat-Sen Univ., Kaohsiung 804, Taiwan (corresponding author).
3. Engineer Director, USEPA, Kansas City, KS.
4. Ph.D. Candidate, Institute of Environmental Engineering, National Sun Yat-Sen Univ., Kaohsiung 804, Taiwan.