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UNESCO-IHE Institute for Water Education, Delft (2004)

Options for wastewater management in Harare, Zimbabwe

Nhapi, Innocent

Titre : Options for wastewater management in Harare, Zimbabwe

Auteur : Nhapi, Innocent,

Université de soutenance : UNESCO-IHE Institute for Water Education, Delft

Grade : Master of Science (MS) 2004

The sustainable management of wastewater should aim at pollution prevention and reduction first, followed by resource recovery and reuse. This thesis shows that substantial water quality improvements could be achieved through a so-called 3-Step Strategic Approach to wastewater management. This thesis focused on Harare, in the Lake Chivero catchment area of Zimbabwe. A water quality monitoring study established that the current situation leads to water quality deterioration in the lake and is wasteful in terms of water use. Using the 3-Step Approach, short-term, medium-term, and long-term solutions were developed. The short-term solutions include pollution prevention and the reduction of wastewater volume. The medium-term solutions involve treating wastewater to high standards, introducing or improving resource recovery and reuse options, and controlling upstream point and non-point sources of pollution. A long-term solution was suggested based on pollution prevention and direct reuse, treatment at onsite and decentralised levels followed by reuse, and disposal of the remaining effluents combined with stimulation of the self-purification capacity of the receiving rivers. The long-term measures would aim at sustaining acceptable lake water quality under increased urbanisation conditions. The frameworks for managing wastewater at onsite, decentralised, and centralised levels developed in this research can be used in re-designing current systems or designing new systems that make optimal use of wastewater components whilst minimising pollution to the environment.

Mots Clés  : Water supply Sewage disposal Nutrient pollution of water Harare. wastewater management decentralised sanitation case studies Zimbabwe


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