A dual-media filter consists of a 0.50-m layer of anthracite and 0.30-m layer of sand. The anthracite medium has specific gravity of 1.67, porosity of 0.50, and a d90 grain size of 150mm.The sand medium has a specific gravity of 2.65, a porosity of 0.40, and a d90 grain size of 0.90 mm. The water temperature is 20°C.
(a) Calculate the recommended minimum backwash rate for the filter,
(b) Calculate the pressure drop through the filter during fluidization. Use equations 10.17 - 10.19 for this problem
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