1. Section Chief, China Engineering Consultants, Inc., 21FL, 185 Hsin-Hai Rd., Taipei, Taiwan 10637.
2. Head, Hyperion Applied Research Group, Bureau of Sanitation, Hyperion Treatment Plant, 12000 Vista del Mar, Playa Del Rey, CA 90293.
3. Professor, Civil and Environmental Engineering Dept., Univ. California Los Angeles, 5714 Boelter Hall, Los Angeles, CA 90095-1598 (corresponding author).