6/9/2015Water filtration1 FILTRATION Settling does not remove all flocs – further treatment is...

04/18/23 Water filtration 1

FILTRATIONFILTRATION

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


Overview of solid-liquid separation alternatives in water

DirectFiltration


(precoat filtration)or expanded perlite


Particle size (micron)


Filtration Mechanisms

Important to understand the mechanisms

Settling, adsorption and diffusion Not much screening


A B

C


2-4 gpm/ft2 18-40 thou 1.6-3.3 ft

0.5-2 thou1-3 gpm/ft2

Filter Classification by Filtration Rate


Diagrammatic layoutof sand filters


Typical multimedia filter


Construction details of sand filters


Construction details of sand filter


Filter operation


Some examples of layout and construction details


Multimedia filters


PRESSUREPRESSUREFILTERSFILTERS


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


Slow Sand Filtration


Slow Sand Filter Cleaning


Slow Sand Filter Underdrain

6/9/2015Water filtration1 FILTRATION Settling does not remove all flocs – further treatment is...

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Transcript of 6/9/2015Water filtration1 FILTRATION Settling does not remove all flocs – further treatment is...