1. Use a concentration of 20.0 mg/L for the pollutant (instead of 10.0 mg/L) (Materials Balance, Steady State Conservative System). 2. Use a reaction rate of K=0. 30/day (instead of K = 0.25/day) (Materials Balance, CSTR, 1st Order).
3. The stream has an unknown BOD concentration C0 =? (instead of 20 mg/L). The regulatory limit at the discharge of Pond 2 is 20 mg/L (C2 = 20 mg/l). Find the maximum BO concentration leaving Pond 1 and in the stream (C0 =? and C1 =?).