FILTRATION

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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

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Overview of solid-liquid separation alternatives
in water
Direct Filtration
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(precoat filtration)
or expanded perlite
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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

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B
A
C
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Filter Classification by Filtration Rate
2-4 gpm/ft2
18-40 thou 1.6-3.3 ft
1-3 gpm/ft2
0.5-2 thou
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Diagrammatic layoutof 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
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Some examples of layout and construction
details
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Multimedia filters
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PRESSURE FILTERS

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Slow Sand Filtration
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Slow Sand Filter Cleaning
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Slow Sand Filter Underdrain