surface water treatment plant. fig 4-8: flow diagram of conventional surface water treatment plant...
TRANSCRIPT
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Surface Water Treatment Plant
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Fig 4-8: Flow Diagram of conventional surface water treatment plant (“filtration plant”)
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Coagulation = Charge reductionFlocculation = Contact of particles
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Fig 4-10: Effect of salt on electric potential
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Fig 4-11: Effect of valence on electric potential
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Fig 4-8: Flow diagram of water softening plant
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Alkalinity in Coagulation
Needed to neutralize acid formed
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Fig 4-13: results from jar test
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Paddle Mixer Details
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Paddle Mixers in Left Chamber and Flocculators in Right Two Chambers
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Fig 4-35: Settling in an upflow clarifier
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Fig 4-32: Zones of sedimentation on a horizontal flow clarifier
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Q
V
h
time
depthvs
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Q
V
h
time
depthvs
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V
hQ
QVh
vs
wlhhQ
vs
os vA
Qv
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Fig 4-37: Partial solids removal in ideal sedimentation tank
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Fig 4-37: Partial solids removal in ideal sedimentation tank
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o
s
v
vP 100
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Let’s say v0 = 0.20 mm/s
What % removal for particles with settlingvelocity = 0.15 mm/s?
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%7520.0
15.0100 P
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Fig 4-43: Typical gravity filter box
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Fig 4-44: Operation of rapid sand filter
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Manual Control Panel in Water Treatment Plant
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Lime slaker and feed system.
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Upflow solids contact tank. Effluent weir on right.
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Settling tank with radial weirs
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Rapid sand filter with exposed under drain block.Wash water troughs run from left into gullet on right.
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Rapid sand filter with water level just below backwash troughs. Note iron stain at high water line.
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Rapid sand filter during filtration.Reflection shows water level above gullet and backwash troughs.
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Rotameter used to measure flowrate of gaseous chlorine into water.
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Hydrofluorosilicic acid drum and pump metering system for feeding fluoride into water.
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Softening sludge lagoon. Winter view shows ice (light blue) where supernatant water is stnading.
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Overview of water treatment plant showing sludge lagoons and building housing treatment facilities.