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A lagoon is to be designed to treat an input of 2.5m3/s of non-conservative pollutant with concentration 45mg/L and first-order decay coefficient K of 0.12/

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A lagoon is to be designed to treat an input of 2.5m3/s of non-conservative pollutant with concentration 45mg/L and first-order decay coefficient K of 0.12/ day. The effluent from the lagoon must have pollutant concentration of less than 1mg/L. Assuming complete mixing, how large (volume) must the lagoon be? What would be the lagoon surface area in acre if its depth is 3ft

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