Skip to main content
TitleStudy of a horizontal-flow roughing filter for pretreatment prior to slow sand filtration
Publication TypeConference Paper
Year of Publication1988
AuthorsWilliams, PG
PaginationPaper A.2 (11 p.): fig., tab.
Date Published1988-01-01
Keywordschemical quality, horizontal roughing filtration, microbiological quality, pilot plants, pretreatment, slow sand filtration, south africa lebowa moganyaka, turbidity removal

A pilot plant study to assess the effectiveness of a horizontal roughing filter as a pretreatment to slow sand filters, was conducted over a 15 month period from Nov. 1984 to Feb. 1986 at Moganyaka village, Lebowa, South Africa. The roughing filter reduced the influent turbidity by between 70 and 85%, as well as reducing colour, iron, and bacterial counts. Slow sand filter run lengths increased from less than one month to between 2 and 6 months. Cleaning of the roughing filter after 15 months of operation took 2 weeks. Design simplifications are recommended. As a result of the study, full-scale roughing filters have been constructed at 2 treatment plants (100,000 l/day each) in Ciskei.

Notes5 ref.
Custom 1255.4


The copyright of the documents on this site remains with the original publishers. The documents may therefore not be redistributed commercially without the permission of the original publishers.

Back to
the top