A lagoon with volume 1500 mg/m3 has been receivingsteady flow of non-conservative waste (reaction rake k = 0.20/day)at a rate of 125 m3/day for a long enough time to assume that steady- state conditions apply. The wasteentering 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?