1. Ph.D. Candidate, Environmental Engineering Group, Dept. of Civil Engineering, The Univ. of British Columbia, 6250 Applied Science Ln., Vancouver BC, Canada V6T 1Z4.
2. Professor, Environmental Engineering Group, Dept. of Civil Engineering, The Univ. of British Columbia, 6250 Applied Science Ln., Vancouver, BC, Canada V6T 1Z4 (corresponding author).
3. Professor, Dept. of Biotechnology, Delft Univ. of Technology, Julianalaan 67, 2628 BC Delft, The Netherlands.