The flow rate to a fine-bubble aeration basin is 21.5 mgd at 20°c with an influent bod concentration of 180 mg/l and 31 mg/l of ammonia. the effluent concentration is 10 mg/l of bod and no ammonia. according to the aeration equipment manufacturer, at the local operating conditions, for this equipment otr = 3.0 lb o2/hp-hr and ote = 25%. calculate.
a) the total oxygen demand, in lb/day.
b) the power required to operate the aeration system, in hp.
c) the air flow rate, in ft3 /min.