A lagoon with volume 1200m^3 has been receiving a steady flow of a conservative waste at a rate of 100 m^3 per day for a long enough time to assume that steady-state conditions apply....

A lagoon with volume 1200m^3 has been receiving a steady flow of a conservative waste at a rate of 100 m^3 per day for a long enough time to assume that steady-state conditions apply.  The waste entering the lagoon has a concentration of 10mg/L.  Assuming completely mixed conditions,

a. what would be the concentration of the pollutant in the effluent leaving the lagoon?

b. if the input waste concentration suddenly increased to 100mg/L, what would be the concentration 7 days later?

c.  Repeat this problem for a non-conservative pollutant with a reaction rate of K=0.20/d