Potsdam Wastewater Treatment Works

Case Study Case Study Case Study

Potsdam Wastewater Treatment Works

Due to significant yearly increases in flow, the Cape Town City Council decided in 2004 to expand its capacity from 35 Ml/d (million litres per day) to 47 Ml/d. The older section of the works, which consisted of bio filters, were closed down due to effluent not complying with the standard set by the Department of Water Affairs. Aurecon was appointed to carry out the feasibility investigation, preliminary and detail design and implementation of the new extension, sized to treat 30 Ml/d. The newly refurbished Potsdam, which opened in 2006, is a facility in Milnerton, on the coast northeast of the centre of Cape Town. It now supplies an additional 38 million litres of non-potable water to the Blauuwberg area for public and private irrigation purposes.

A 3,000m3/hr. pilot plant was installed at the primary sludge tank feeding the belt presses.

At this location the H2S levels varied from 75 to 300ppm depending on the age and origin of the waste stream.

The unit was rented by the City and installed at various places where they experienced breakdowns of existing odour control equipment; being fully mobile the unit could move and be in full operation within an hour.

The independent laboratories Ecoserv tested the efficiency of the system, and found that the system had a 99.6% removal rate of H2S.