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Fig 4-8: Flow Diagram of conventional surface water treatment plant filtration plant - PowerPoint PPT Presentation


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Water Treatment. CE 326 Principles of Environmental Engineering Department of Civil, Construction and Environmental Engineering Iowa State University March 3, 2008 Tim Ellis, Ph.D., P.E. Fig 4-8: Flow Diagram of conventional surface water treatment plant (“filtration plant”).

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Water Treatment

CE 326 Principles of Environmental Engineering

Department of Civil, Construction and Environmental Engineering

Iowa State University

March 3, 2008

Tim Ellis, Ph.D., P.E.


Fig 4 8 flow diagram of conventional surface water treatment plant filtration plant
Fig 4-8: Flow Diagram of conventional surface water treatment plant (“filtration plant”)


Fig 4 8 flow diagram of water softening plant
Fig 4-8: Flow diagram of water softening plant


Coagulation charge reduction flocculation contact of particles

Coagulation = Charge reductionFlocculation = Contact of particles


Fig 4 10 effect of salt on electric potential
Fig 4-10: Effect of salt on electric potential


Fig 4 11 effect of valence on electric potential
Fig 4-11: Effect of valence on electric potential


Fig 4 13 results from jar test
Fig 4-13: results from jar test


Alkalinity in coagulation needed to neutralize acid formed

Alkalinity in CoagulationNeeded to neutralize acid formed



Paddle mixers in left chamber and flocculators in right two chambers
Paddle Mixers in Left Chamber and Flocculators in Right Two Chambers


Fig 4 35 settling in an upflow clarifier
Fig 4-35: Settling in an upflow clarifier


Fig 4 32 zones of sedimentation on a horizontal flow clarifier
Fig 4-32: Zones of sedimentation on a horizontal flow clarifier


Fig 4 37 partial solids removal in ideal sedimentation tank
Fig 4-37: Partial solids removal in ideal sedimentation tank


Let s say v 0 0 20 mm s what removal for particles with settling velocity 0 15 mm s

Let’s say v0 = 0.20 mm/sWhat % removal for particles with settlingvelocity = 0.15 mm/s?


Fig 4 43 typical gravity filter box
Fig 4-43: Typical gravity filter box


Fig 4 44 operation of rapid sand filter
Fig 4-44: Operation of rapid sand filter




Upflow solids contact tank effluent weir on right
Upflow solids contact tank. Effluent weir on right.



Rapid sand filter with exposed under drain block.Wash water troughs run from left into gullet on right.


Rapid sand filter with water level just below backwash troughs note iron stain at high water line
Rapid sand filter with water level just below backwash troughs. Note iron stain at high water line.


Rapid sand filter during filtration reflection shows water level above gullet and backwash troughs
Rapid sand filter during filtration. troughs. Note iron stain at high water line.Reflection shows water level above gullet and backwash troughs.





Overview of water treatment plant showing sludge lagoons and building housing treatment facilities
Overview of water treatment plant showing sludge lagoons and building housing treatment facilities.


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