Water Science & Technology: Water Supply Vol 7 No 5-6 pp 131–139 © IWA Publishing 2007 doi:10.2166/ws.2007.148
Novel dual media combination for drinking water treatment
A. Mikol*, C.S.B. Fitzpatrick*, M.J. Chipps* , M.E.J. Steele* and R.G.W. Bayley*
*Department of Civil and Environmental Engineering, University College London, Gower Street, London, WC1E 6BT, UK
**Thames Water R & D, Spencer House, Manor Farm Road, Reading, RG2 0JN, UK
ABSTRACT
A novel media combination comprising of two layers of commercially available expanded clay (EC) media was tested for use in existing roughing filters (RF). Results have indicated a potentially suitable alternative to anthracite/sand, a dual media combination of a fine grade of high density EC media and a coarse grade of low density EC media. This novel dual media consistently achieved longer run lengths, whilst producing filtrate of adequate quality for slow sand filter influent – even when challenged with algal laden water.
Keywords: Anthracite; dual media; expanded clay; filtration; sand
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