The design wastewater flow for a small community is 400 m3/d , containing 200 mg/I BOD and 240 mg/I suspended solids. The proposed treatment is extended aeration without primary sedimentation. After aerobic digestion, the waste sludge can be taken directly from the aerobic digesters for spreading on agricultural land or pumped into a large asphalt-lined storage basin for winter storage.
(a) Calculate the required capacity for the aerobic digesters assuming the F/M loading on the aeration lank is 0.15 g BOD/d per gram MLSS, the waste-activated sludge solids content is 1.5% (70% volatile), and the criteria for sizing the aerobic digesters are a maximum VS loading of 0.60 kg/m3 • cl and a minimum digestion period of 15 days.
(b) How large must the storage basin be to hold a 90-day volume of digested sludge, assuming that the total solids reduction during aerobic digestion is 25% of the total solids in the applied sludge and the sol ids concentration in the storage basin can be increased to 2.0% by withdrawing supernatant? .
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