News from the South African water sector

Abstract

B iwater South Africa undertook a R25,2-million mechanical and electrical contract for Phase Two of the extension of the Potsdam Wastewater Treatment Works, in Cape Town. Work to upgrade the ageing sewage treatment plant, which was originally constructed in the 1950s, started in 2004. The plant, which serves the Blaauwberg area, has been operating beyond its design capacity. The Potsdam works in its past configuration comprised two streams, one being treated by a biofilter system and the other through an activated sludge process. Biwater South Africa is responsible for all the mechanical and electrical work on the present extension. The company reports that the extension project comprised construction of a raw water pump station, a biological reactor complete with ten aerators ranging from 55 kW to 110 kW in size, 12 mixers, recycle pumps, dissolved oxygen measurement and control. There are four clarifiers each with a diameter of 35 mas well as a return activated sludge pump station.

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