A treatment plant produces an average of 75,000 gpd of primary sludge with a solids concentration of 6.0% and 230,000 gpd of waste-activated sludge having a water content of 99.0%.
(a) If the waste-activated sludge is thickened to 4.0% solids by flotation and then combined with the primary sludge prior to dewatered what are the quantity and solids content of the blended sludge? (Assume 100% solids capture in flotation thickening.)
(b) If belt fi lter presses dewater the sludge to 23% solids, how many 8-ton truckloads of cake must be hauled to land burial each day? (Assume 100% solids capture in filtration and negligible w eight added by chemical conditioning.) .
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