Size a gravity thickener based on 10 lb/ft2/day for a waste sludge flow of 25.000 gpd with 5.0% solids. Assume a side-water depth of 10.0 ft. After installation, operation at design flow yields an underflow of 8 0% with 90% solids removal. What is the flow of dilution water needed to maintain an overflow rate of 400 gpd/ft2? if the consolidated sludge blanket in the tank is 4.0 ft thick, compute the estimated solids retention lime in the thickener.
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