oa Civil Engineering = Siviele Ingenieurswese - First CoCo DAFF water-works in South Africa
In South Africa's first plant of its type, flash mixing, floculation and float layer removal are performed hydraulically. The 20-year-old waterworks at Klipdrift, situated at Hammanskraal north of Pretoria, consisted of seven 'package' plants, with a total capacity of 12 Mt/d. Each package plant consisted of a sedimentation clarifier followed by sand filters, a process eminently suited to most surface waters in which silt forms the major undesirable particulate matter. Klipdrift, however, receives its water from the Roodeplaat Dam, situated on the Pienaar's River to the north of Pretoria, via a 30 km long open irrigation canal. Urbanisation and the influence of effluents from wastewater treatment works have increased the nutrient content of this water to the stage where algal growths occur both in the dam and in the open irrigation canal.
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