Acompletely mixed activated-sludge plant is being designed for a wastewater flow of 5.0 mgd. the soluble bod concentration of the influent to the aeration basin is 200 mg/l. the effluent soluble bod requirement is 10 mg/l. the mean cell residence time is to be 8.0 days at an mlss concentration of 2500 mg/l. from pilot plant data, y = 0.6 lb vss/lb bod, kd = 0.06 day–1 , and 80% of the mlss are vss. calculate:

a) the volume of the aeration basin, in gals.
b) the dry mass of excess solids in the waste sludge in lb/day.
c) the aeration period, q in hours.
d) food-to-microorganism ratio, f/m.
e) bod loading, lb/day-1000 ft3 .