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filter is backwashed at a rate of 0.4(10 ) m/s. The bed depth is 0.7 m. The ratio le/1 = 1.32. pp = 2,650 kg/m . Determine the temperature at which the filter is operated.

7.28 A sand filter bed with an average dp = 0.06 cm is backwashed at a rate of 0.4(10_2) m/s. Calculate the resulting expanded porosity.

7.29 A sand filter bed with an average dp = 0.06 cm is backwashed to an expanded porosity of 0.47. Determine the rate used in backwashing.

7.30 A sand filter bed is backwashed to an expanded porosity of 0.47. The

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