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treatment plant discharges 25 million gallons of domestic wastewater per day into a river with a typical flow of 250 ft/sec. The speed of the river is 3 miles per hour and the depth is 12 ft. The activity coefficient of the bed is 0.40. The temperature of the used water is 21C, while that of the river is 18C. The biochemical oxygen demand (BOD) after 5 days of the used water is 24 mg/l, while that of the river is 1.0 mg/l. The wastewater does not contain dissolved oxygen, however the river before discharge has a dissolved oxygen concentration equivalent to 90% of the saturated concentration. Show the detailed mass balance.Determine DO, y at the distance that occurs from the point of mixing

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