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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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Fig 4 8 flow diagram of conventional surface water treatment plant filtration plantSlide 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.

Fig 4 8 flow diagram of conventional surface water treatment plant filtration plantSlide 2

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

Fig 4 8 flow diagram of water softening plantSlide 3

Fig 4-8: Flow diagram of water softening plant

Coagulation charge reduction flocculation contact of particlesSlide 4

Coagulation = Charge reductionFlocculation = Contact of particles

Fig 4 10 effect of salt on electric potentialSlide 5

Fig 4-10: Effect of salt on electric potential

Fig 4 11 effect of valence on electric potentialSlide 6

Fig 4-11: Effect of valence on electric potential

Fig 4 13 results from jar testSlide 7

Fig 4-13: results from jar test

Alkalinity in coagulation needed to neutralize acid formedSlide 8

Alkalinity in CoagulationNeeded to neutralize acid formed

Paddle mixer detailsSlide 9

Paddle Mixer Details

Paddle mixers in left chamber and flocculators in right two chambersSlide 10

Paddle Mixers in Left Chamber and Flocculators in Right Two Chambers

Fig 4 35 settling in an upflow clarifierSlide 11

Fig 4-35: Settling in an upflow clarifier

Fig 4 32 zones of sedimentation on a horizontal flow clarifierSlide 12

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

Fig 4 37 partial solids removal in ideal sedimentation tankSlide 15

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 sSlide 17

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

Fig 4 43 typical gravity filter boxSlide 26

Fig 4-43: Typical gravity filter box

Fig 4 44 operation of rapid sand filterSlide 27

Fig 4-44: Operation of rapid sand filter

Manual control panel in water treatment plantSlide 28

Manual Control Panel in Water Treatment Plant

Lime slaker and feed systemSlide 29

Lime slaker and feed system.

Upflow solids contact tank effluent weir on rightSlide 30

Upflow solids contact tank. Effluent weir on right.

Settling tank with radial weirsSlide 31

Settling tank with radial weirs

Fig 4 8 flow diagram of conventional surface water treatment plant filtration plantSlide 32

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 lineSlide 33

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 troughsSlide 34

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

Rotameter used to measure flowrate of gaseous chlorine into waterSlide 35

Rotameter used to measure flowrate of gaseous chlorine into water.

Hydrofluorosilicic acid drum and pump metering system for feeding fluoride into waterSlide 36

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 stnadingSlide 37

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 facilitiesSlide 38

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


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