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backwash
GATE Civil Engineering · Environmental Engineering - Water Treatment - Filtration · 2021-2026
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All concepts →2026 Q21
A rapid sand filter bed of depth 0.8 m has 40% porosity during service cycle. It is recommended that during backwash operation, the expanded filter bed should have 70% porosity. Th...
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2021 Q33
A water filtration unit is made of uniform-size sand particles of 0.4 mm diameter with a shape factor of 0.84 and specific gravity of 2.55. The depth of the filter bed is 0.70 m an...
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