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