n Civil Engineering = Siviele Ingenieurswese - Preekstoel water treatment works : projects : technical excellence category

Volume 23, Issue 10
  • ISSN : 1021-2000



The Preekstoel Water Treatment Works (WTW), located in the Hemel and Aarde Valley near Hermanus in the Western Cape, was designed to treat mainly surface water from the De Bos Dam. Between 2010 and 2014 the WTW was refurbished and an additional treatment lane was constructed for the treatment of borehole water. This lane comprises the first full-scale biological iron and manganese removal plant in South Africa, with a total capacity of 10 M/d. The previous treatment processes at the WTW were inappropriate for groundwater treatment, since the groundwater is rich in iron and manganese. The project team proposed the adoption of a biological filtration process to treat borehole water, which has proven to successfully deliver treated water that is within the stipulated iron and manganese limits applicable to drinking water standards in South Africa.

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