Deer Valley Water Treatment Plant Solids Handling Facility
City of Phoenix, Arizona
Wilson Engineers designed new solids facilities to treat sludge blowdowns and filter wash water for the WTP. The following processes were included: sludge and wash water equalization basins, gravity thickeners, wash water clarifiers, thickened sludge storage basins, Dewatering Building with centrifuges, polymer feed systems, roll-off bin storage area, and odor control facilities. Secondary and presedimentation basin blowdown (waste stream) pipes from the existing treatment plant are diverted to the sludge equalization basin. The equalized sludge from the basins is conveyed to three gravity thickeners for settling. Filter wash water is diverted to the wash water equalization basin. The wash water is then pumped to wash water clarifiers to allow settling of the solids. The settled solids from the wash water clarifiers are pumped to gravity thickeners for further settling. Sludge from gravity thickeners is stored in thickened sludge storage basins for further processing. Thickened sludge is pumped to centrifuges located in the new Dewatering Building. Centrifuges dewater the thickened sludge and the dewatered sludge is transported to the landfill. The dewatering building truck loading area and thickened sludge storage basins are provided with odor control.
