1. M.A.Sc., Environmental Engineering, Dalhousie Univ., 1360 Barrington St., Halifax, Nova Scotia, B3J 2X4, Canada.
2. Post-doctoral Associate, Biological Engineering, Dalhousie Univ., 1360 Barrington St., Halifax, Nova Scotia, B3J 2X4, Canada (corresponding author).
3. Associate Professor, Dept. of Process Engineering and Applied Science, Dalhousie Univ., 1360 Barrington St., Halifax, Nova Scotia, B3J 2X4, Canada.
4. Associate Professor, Engineering Dept., Nova Scotia Agricultural College, P.O. Box 550, Truro, Nova Scotia, Canada.
5. Associate Professor, Civil Engineering, Dalhousie Univ., 1360 Barrington St., Halifax, Nova Scotia, B2J 2X4, Canada.