The normal values of over flow rates for secondary sedimentation tanks, ranges between__________________?
(A) 25,000 to 35,000 litres/sqm/day
(B) 40,000 to 50,000 litres/sqm/day
(C) 50,000 to 60,000 litres/sqm/day
(D) 80,000 to 10,000 litres/sqm/day
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