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n Journal of the South African Institution of Civil Engineers - Five years of combined flotation / filtration at the Rietvlei Water Treatment Plant : technical paper

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Abstract

The water treatment plant at Reitvlei Dam near Pretoria was the first treatment plant in South Africa to use combined dissolved air flotation and filtration (the DAFF process) as a permanent, integral process unit. During the first five years of operation, the performance of the plant was closely monitored, while certain aspects of the plant were optimised. This paper describes the raw water quality profile of the Reitvlei Dam, the main design features of the treatment plant and the profile of the average water quality produced. Special attention is given to two practical aspects, namely the introduction of dual-media filtration to lower the backwash frequency and the recovery of filter backwash water.

Gekombineerde flottasie-filtrasie is vir die eerste keer as 'n permanente eenheidsproses in Suid-Afrika vir drinkwatersuiwering toegepas toe die herboude Rietvlei-aanleg naby Pretoria in 1988 in werking gestel is. Die werkverrigting van die aanleg is noukeurig oor die eerste vyf jaar na inbedryfstelling gemonitor, en sekere gedeeltes van die proses is terselfdertyd geoptimiseer. Die verhandeling beskryf die tipiese rouwaterprofiel, die belangrikste ontwerpparameters van die aanleg en die tipiese profiel van die finale water wat gelewer word. Spesiale klem word gele op twee praktiese aspekte van die aanleg naamlik die verandering van die mediabeddings vanaf enkelmedium na dubbelmedia en moontlike metodes om die effektiwiteit van die waswaterherwinningstelsel te verbeter.

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/content/civileng1/38/1/EJC26775
1996-01-01
2016-12-08
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