During a snowstorm the fluoride feeder in North Bend runs out of feed solution.

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During a snowstorm the fluoride feeder in North Bend runs out of feed solution. As shown in Figure P4.25 the rapid mix tank is connected to a 5-km long distribution pipe. The flow rate into the rapid mix tank 0.44 m3, s-1, and the volume of the tank is 2.50 m3. The velocity in the pipe is 0.17 m. s-1 . If the fluoride concentration in the rapid mix tank is 1.0 mg. L-1 when the feed stops, how long until the concentration fluoride is reduced to 0.01 mg. L-1 at the end of the distribution pipe? The fluoride may be considered nonreactive chemical. A sewage lagoon that has a surface area of 10 ha and a

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