In a city water-filtration plant, it was desired to filter 5000 gal of water per hour...

 

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In a city water-filtration plant, it was desired to filter 5000 gal of water per hour through a sand filter bed to remove all the suspended matter and solids from the water. A vertical cross-sectional view of the filtration unit is shown in the following figure: Data given: Quantity of water to be filtered: 5000 gal/hour Thickness of sand filter bed: 4 ft Permeability of sand filter bed: 1200 mD Cross sectional area of sand filter: 1800 ft = 1.0 cp; p=1 g/cc Filter bed What level of water must be kept in the pit above the sand filter bed in order to filter 5000 gal of water per hour? Assume that the solids removed from the water do not alter the permeability of the bed. In a city water-filtration plant, it was desired to filter 5000 gal of water per hour through a sand filter bed to remove all the suspended matter and solids from the water. A vertical cross-sectional view of the filtration unit is shown in the following figure: Data given: Quantity of water to be filtered: 5000 gal/hour Thickness of sand filter bed: 4 ft Permeability of sand filter bed: 1200 mD Cross sectional area of sand filter: 1800 ft = 1.0 cp; p=1 g/cc Filter bed What level of water must be kept in the pit above the sand filter bed in order to filter 5000 gal of water per hour? Assume that the solids removed from the water do not alter the permeability of the bed.