1. Cooperative Research Programs, Lincoln University, Jefferson City, Missouri.
2. Environmental Engineering Program, Chemical Engineering Department, Tuskegee University, Tuskegee, Alabama.
3. Department of Chemical Engineering, 334 Lester H. Foster Hall, Tuskegee University, Tuskegee, AL 36088. Phone: 334-724-4265; Fax: 334-724-4397; E-mail: Egiebor@tuskegee.edu