Water Treatment
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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 water softening plant


Coagulation = Charge reductionFlocculation = Contact of particles


Fig 4-10: Effect of salt on electric potential


Fig 4-11: Effect of valence on electric potential


Fig 4-13: results from jar test


Alkalinity in CoagulationNeeded to neutralize acid formed


Paddle Mixer Details


Paddle Mixers in Left Chamber and Flocculators in Right Two Chambers


Fig 4-35: Settling in an upflow clarifier


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


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


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 4-44: Operation of rapid sand filter


Manual Control Panel in Water Treatment Plant


Lime slaker and feed system.


Upflow solids contact tank. Effluent weir on right.


Settling tank with radial weirs


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 during filtration.Reflection shows water level above gullet and backwash troughs.


Rotameter used to measure flowrate of gaseous chlorine into water.


Hydrofluorosilicic acid drum and pump metering system for feeding fluoride into water.


Softening sludge lagoon. Winter view shows ice (light blue) where supernatant water is stnading.


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


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