A lagoon with volume 1,200 m^3 has been receiving a steady flow of a conservative waste at a rate of 100 m^3/day for a long enough time to assume…

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A lagoon with volume 1,200 m^3 has been receiving a steady flow of a conservative waste at a rate of 100 m^3/day for a long enough time to assume that steady-state conditions apply. The waste entering the lagoon has a concentration of 10 mg/L. Assuming completely mixed conditions,

a) What would be the concentration of pollutant in the effluent leaving the lagoon?

b) If the input waste concentration suddenly increased to 100 mg/L, what would the concentration in the effluent be 7 days later?

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