Question: A lagoon with volume has been receiving a steady flow of a conservative waste at a rate of for a long enough time to assume

A lagoon with volume has been receiving a steady flow of a conservative waste at a rate of for a long enough time to assume that steady-state conditions apply. The waste entering the lagoon has a concentration of Assuming completely mixed conditions,
What would be the concentration of pollutant in the effluent leaving the lagoon?
If the input waste concentration suddenly increased to what would the concentration in the effluent be days later?

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