1. Africa Center of Excellence for Water Management, Addis Ababa University, Addis Ababa, P.O. Box 1176, Ethiopia
2. Department of Chemical Engineering, Wachemo University, Hossana, P.O. Box 667, Ethiopia
3. School of Chemical and Bio Engineering, Addis Ababa Institute of Technology, Addis Ababa, Ethiopia
4. Department of Chemistry, College of Natural and Computational Science, Addis Ababa University, Addis Ababa, Ethiopia