• An aerobic complete-mix reactor (no recycle) with a volume of 1000 L receives a 500 L/d wastewater flow and has an effluent soluble COD concentration of 10 mg/L. For one of the wastewaters with the characteristics given below, determine (a) the t value for the reactor in days, (b) the oxygen used per day in (g/d), (c) the effluent volatile suspended solids concentration (assume biomass oxygen equivalent of 1.42 g O2/g VSS), and (d) the observed yield in g VSS/g bsCOD removed.