Design of Sewerage and Wastewater Treatment Plant for Thika Greens Phase II Housing Development


This project is a design of a wastewater treatment plant (WWTP) for a housing development. The housing development is Thika Greens Phase II which is located 40km from Nairobi. The treatment plant will treat domestic and commercial wastewater from the housing development. The WWTP will cater for a 3 % projected population growth rate over a design period of 20 years from 2014 to 2034. The sewerage system consisted of 4.3 km of concrete pipes ranging from 150 – 1000mm. The quantity of flow ranged from 0.01 – 7 . The velocities ranged from 0.1 – 1 m/s. The components of the WWTP were sized in order to cater for the quantity of wastewater entering the different treatment processes. The treatment plant consisted of one bar screen chamber, two aerated grit chambers, four sedimentation tanks, three secondary clarifiers and two sludge drying beds.

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