6/9/2015Water filtration1 FILTRATION Settling does not remove all flocs – further treatment is required Filtration provides the additional opportunity for separation of small flocs or particles This presentation is an introduction to filtration technology concepts

6/9/2015Water filtration2 Overview of solid-liquid separation alternatives in water Direct Filtration

6/9/2015Water filtration3 (precoat filtration) or expanded perlite

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6/9/2015Water filtration5 Particle size (micron)

6/9/2015Water filtration6 Filtration Mechanisms Important to understand the mechanisms Settling, adsorption and diffusion Not much screening

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6/9/2015Water filtration8 A B C

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6/9/2015Water filtration gpm/ft thou ft thou 1-3 gpm/ft 2 Filter Classification by Filtration Rate

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6/9/2015Water filtration14 Diagrammatic layout of sand filters

6/9/2015Water filtration15 Typical multimedia filter

6/9/2015Water filtration16 Construction details of sand filters

6/9/2015Water filtration17 Construction details of sand filter

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6/9/2015Water filtration19 Filter operation

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6/9/2015Water filtration21 Some examples of layout and construction details

6/9/2015Water filtration22 Multimedia filters

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6/9/2015Water filtration27 PRESSUREFILTERS

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6/9/2015Water filtration29 1.Overflow 2.Filter Influent 3.Coarse Media 4.Fine Media 5.Filtrate Nozzles 6.Filtrate Chamber 7.Level Controller 8.Filter Reject 9.Wash box 10.Counter-Current Washer 11.Airlift 12.Central Feed Chamber 13.Actuated Valve

6/9/2015Water filtration30 Slow Sand Filtration

6/9/2015Water filtration31 Slow Sand Filter Cleaning

6/9/2015Water filtration32 Slow Sand Filter Underdrain