A lake with a constant volume of 10 x 106 m3 is fed by a pollution-free stream with flow rate 50 m3/s. A factory discharges 5 m3/s of a non-conservative waste with concentration 100 mg/L into the lake. The pollution has a reaction rate coefficient K of 0.25/day.
Assuming the pollution is well mixed in the lake, find the steady-state concentration of the pollution in the lake.
A lagoon with a volume of 1200m3