A new two-stage anaerobic digestion system is being sized for an activated-sludge plant with primary sedimentation. Based on an average raw wastewater flow during the maxi mum month of 50,000 mVd containing 2S0 mg/l of suspended solids and 240 mg/l of BOD, primary waste solids are calculated to be 7000 kg/d and waste-activated sludge solids are calculated to be 3900 kg/d for a total of 10,900 leg/d with a volatile solids content of 70%. Both sludges are to be thickened so that the solids concentration will be 5.0% for a volume of 218 nrVd. For a solids retention lime in the first-stage tank of 20 d, calculate the volatile solids loading. Tf digestion reduces the volatile solids by 50%. what is the calculated concentration of solids in the digested sludge flowing into the second-stage tank? If 50 m3/d of reasonably clear supernatant can be withdrawn from the second tank, what is the estimated concentration of digested solids in the thickened sludge withdrawn from the second tank?
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