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 (to be selected by instructor), determine 

(a) the т 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.

 

Wastewater Item Unit 1 2 3 Influent SCOD mg/L mg/L-h 1000 1800 600 Reactor oxygen uptake rate 10 15