The effective size of sand particles used in slow sand filters is_______________?
B. 0.35 to 0.60 mm
C. 0.60 to 1.00 mm
D. 1.00 to 1.80 mm
B. 0.35 to 0.60 mm
C. 0.60 to 1.00 mm
D. 1.00 to 1.80 mm
B. 0.35 to 0.60 mm
C. 0.60 to 1.00 mm
D. 1.00 to 1.80 mm
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B. huge amount of precipitate is formed which creates a disposal problem(Correct)
C. the effluent cannot be reduced to zero hardness
D. it is unsuitable for softening the water of excessive hardnessScour valves are provided ______________?
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B. at every depression and dead ends to drain out the waste water that may collect there(Correct)
C. at the foot of rising main along the slope to prevent back running of water
D. at every summit of rising mains