. The waste sludge production from a trickling-filter plant is 12.5 m3/d containing 620 kg of solids (70% volatile). The proposed anaerobic digester design to stabilize this waste consists of two floating-cover healed tanks, each with a volume of 480 m3 when the covers are fully raised and a volume of 310 mJ with the covers resting on the landing brackets,
(a) Calculate the digester volume per equivalent population with the covers fully raised. Assume 100 g of solids production per capita,
(b) Calculate the digester loading in terms of kg volatile solids fed/nr’ of tank volume below the landing brackets/day. ,
(c) Calculate the digested-sludge storage time available between lowered and raised cover positions. Assume a volatile solids reduction of 60% during digestion and a digested-sludge moisture content of 93%.
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