1.Compare the total reactor volume required for 90% removal of a substance that decays according to first-order kinetics with a rate constant of 0.05 day –1 in a CM system that contains a single reactor against a system that contains three CM reactors of equal volume in series.
2.An activated sludge plant is to be designed for a population of 4000 persons. The influent flow is 380 Lpcd and the influent BOD5 is 200 mg/L. Pertinent data are: Primary clarifier removes 33% of the influent BOD5, and the state regulatory agency allows a volumetric loading of 0.48 kg BOD5 /(m3.day). Determine the reactor basin volume.