Traditional and novel reservoir management techniques to enhance water quality for subsequent potable water treatment

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Courtesy of IWA Publishing

Thames Water treats approximately 2800Ml/d of water originating mainly from the lowland rivers Thames and Lee for supply to over 7.3 million customers, principally in the cities of London and Oxford. Traditionally, for London, water treatment has consisted of abstraction (pumping water from the rivers Thames and Lee), theoretical storage for 30–80 days in deep reservoirs, two stage filtration through rapid gravity filters (RGFs) and slow sand filters (SSFs), then final disinfection with chlorine, with a monchloramine residual maintained in distribution (Toms, 1987). For Oxford and associated regions, ‘conventional’ treatment is used in the form of coagulation, flocculation, dissolved air flotation (DAF) or sedimentation followed by RGFs and chlorination.

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