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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”).
Water Treatment

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Slide 1

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.

Slide 2

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

Slide 3

Fig 4-8: Flow diagram of water softening plant

Slide 4

Coagulation = Charge reductionFlocculation = Contact of particles

Slide 5

Fig 4-10: Effect of salt on electric potential

Slide 6

Fig 4-11: Effect of valence on electric potential

Slide 7

Fig 4-13: results from jar test

Slide 8

Alkalinity in CoagulationNeeded to neutralize acid formed

Slide 9

Paddle Mixer Details

Slide 10

Paddle Mixers in Left Chamber and Flocculators in Right Two Chambers

Slide 11

Fig 4-35: Settling in an upflow clarifier

Slide 12

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

Slide 15

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

Slide 17

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

Slide 26

Fig 4-43: Typical gravity filter box

Slide 27

Fig 4-44: Operation of rapid sand filter

Slide 28

Manual Control Panel in Water Treatment Plant

Slide 29

Lime slaker and feed system.

Slide 30

Upflow solids contact tank. Effluent weir on right.

Slide 31

Settling tank with radial weirs

Slide 32

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

Slide 33

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

Slide 34

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

Slide 35

Rotameter used to measure flowrate of gaseous chlorine into water.

Slide 36

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

Slide 37

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

Slide 38

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


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