Lake Nakuru National Park (LNNP) which is designated as a wetland of International Importance under Ramsar Convention is under threat on a variety of fronts mainly by incoming pollution from wastewater generated within Nakuru Town, Storm water run-off, solid waste, leachate from existing solid waste dump site, etc.
The Objective of this Study is to develop a concept and suitable options to sustain and improve the biodiversity of LNNP while sustaining the environment quality of the Lake and human settlements.
Population of the Study Area which is mainly Nakuru Town will grow from an estimated population of 359,485 (year 2017) to 883,728 (year 2045), resulting in increased water consumption and wastewater generation.
Nakuru is presently served by 2 existing Sewage Treatment Works (STWs) with a combined installed capacity of 16,200m3/day against a current wastewater generation of approximately 32,200m3/day (year 2017). The present wastewater collection and treatment systems are operating below the design capacity and are generally in a dilapidated state resulting in partially treated effluent being discharged to the receiving environment (Lake Nakuru).
Part of Existing Njoro Sewage Treatment Works
Part of Existing Town Sewage Treatment Works
If the present developed area is sewered, the current (year 2017) wastewater generation is approximately 32,200m3/day. This wastewater is expected to increase to 58,800m3/day by the year 2045.
The Feasibility Study has identified various options for wastewater management and disposal of treated effluent. The most viable option is to abandon the existing Town STW, rehabilitate the existing Njoro STW to its optimal Capacity of 9,600m3/day and construct a new Sewage Treatment Works opposite the existing Njoro STW with a design capacity of 49,200m3/day.
Out of the 58,800m3/day of treated effluent, 40,000m3/day can safely be discharged into Lake Nakuru without affecting the biodiversity of the Lake.
The balance of 18,800m3/day is proposed to be conveyed to a proposed site East of Nakuru Town for Agricultural reuse. This site drains into the adjacent Lake Elementaita catchment area.
Final feasibility proposal including the financial analysis are under preparation.