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{"ops":[{"insert":"1. A lake with constant volume 10 x 106 m3\r\nis fed by a pollution-free stream with flow rate 50 m3\r\n\/s. A factory \r\ndumps 5 m3\r\n\/s of a conservative waste with concentration 100 mg\/L into the lake. The pollution has the reaction \r\nrate coefficient K of 0.25\/day. Assume the pollution is well mixed in the lake. Find the concentration of pollution \r\nin the lake.\r\n2. A lagoon is to be designed to accommodate an input flow of 0.10 m3\r\n\/s of non-conservative pollutant with \r\nconcentration 30 mg\/L and reaction rate 0.20\/day. The effluent from the lagoon must have pollutant \r\nconcentration of 5 mg\/L. Assuming complete mixing, how large must the lagoon be?\n"}]}
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