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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 9/14/2018 Water filtration
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Overview of solid-liquid separation alternatives in water
Direct Filtration 9/14/2018 Water filtration
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(precoat filtration) or expanded perlite 9/14/2018 Water filtration
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Particle size (micron)
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Filtration Mechanisms
Important to understand the mechanisms Settling, adsorption and diffusion Not much screening 9/14/2018 Water filtration
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B A C 9/14/2018 Water filtration
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Filter Classification by Filtration Rate
2-4 gpm/ft2 18-40 thou ft 1-3 gpm/ft2 0.5-2 thou 9/14/2018 Water filtration
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Diagrammatic layout of sand filters
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Typical multimedia filter
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Construction details of sand filters
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Construction details of sand filter
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Filter operation 9/14/2018 Water filtration
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Some examples of layout and construction details 9/14/2018
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Multimedia filters 9/14/2018 Water filtration
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PRESSURE FILTERS 9/14/2018 Water filtration
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Counter-Current Washer Airlift Central Feed Chamber Actuated Valve
Overflow Filter Influent Coarse Media Fine Media Filtrate Nozzles Filtrate Chamber Level Controller Filter Reject Wash box Counter-Current Washer Airlift Central Feed Chamber Actuated Valve 9/14/2018 Water filtration
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Slow Sand Filtration 9/14/2018 Water filtration
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Slow Sand Filter Cleaning
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Slow Sand Filter Underdrain
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