Waste-activated sludge from a biological aeration system is 293,000 gpd with 1.0% solids consisting of 70% volatile solids. The sludge is thickened to 4% with a 98% solids capture by gravity belt thickening. The thickened sludge is digested, without withdrawal of supernatant, in high-rate anaerobic digestion (Section 13.15) resulting in a 50% volatile solids reduction. The sludge is then dewatered by belt filter pressing (Section 13.20) to 18% solids concentration with a 95% capture of solids. Calculate the solids concentration and flow at each step in the process, including the wastewater flow recycled from gravity belt thickening and filtrate from the pressure dewatering.
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