COMPARATIVE EVALUATION OF THE IMPACTS OF TWO WASTEWATER TREATMENT WORKS ON THE WATER QUALITY OF ROODEPLAAT DAM IN TSHWANE, GAUTENG by Mpumelelo Blessing Zulu Submitted in accordance with the requirements for the degree Master of Science in Environmental Science in the COLLEGE OF AGRICULTURE AND ENVIRONMENTAL SCIENCE at the UNIVERSITY OF SOUTH AFRICA Supervisor: Dr. C.A. Togo January 2020