Answer to Question #271923 in Chemistry for Bebe

Question

1. A lake with constant volume 10 x 106 m3

is fed by a pollution-free stream with flow rate 50 m3

/s. A factory

dumps 5 m3

/s of a conservative waste with concentration 100 mg/L into the lake. The pollution has the reaction

rate coefficient K of 0.25/day. Assume the pollution is well mixed in the lake. Find the concentration of pollution

in the lake.

2. A lagoon is to be designed to accommodate an input flow of 0.10 m3

/s of non-conservative pollutant with

concentration 30 mg/L and reaction rate 0.20/day. The effluent from the lagoon must have pollutant

concentration of 5 mg/L. Assuming complete mixing, how large must the lagoon be?

Answer 1

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