BY TESFAYE ZEWDIE

the master's course in Environmental Engineering at Addis Ababa University. Many people have helped in one-way of another to make this thesis a better one. I would like to express my thanks to my thesis advisors Dr. Nebeyeleul Gessese, and to my co advisor Associate Professor Kebede Faris for their tremendous cooperation during all stages on the development of the thesis. Big thank to some friends who have contributed to some extent for the realization of the thesis namely Tesfaye Bogale, Girmma Mamo and my service driver Astme Georgis Sereke. Finally, heartfelt thanks to my lovely staff, Nifas Silk Lafito sub city solid waste management team members for their support and encouragement