Waste Water Engineering The normal values of over flow rates for secondary sedimentation tanks, ranges between 80,000 to 10,000 litres/sqm/day 25,000 to 35,000 litres/sqm/day 50,000 to 60,000 litres/sqm/day 40,000 to 50,000 litres/sqm/day 80,000 to 10,000 litres/sqm/day 25,000 to 35,000 litres/sqm/day 50,000 to 60,000 litres/sqm/day 40,000 to 50,000 litres/sqm/day ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is 100 ppm 200 ppm 150 ppm 50 ppm 100 ppm 200 ppm 150 ppm 50 ppm ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering When drainage to sewage ratio is 20, the peak dry weather flow is 20% of the design discharge None of these Slightly less than 5% of the design discharge Slightly more than 5% of the design discharge 20% of the design discharge None of these Slightly less than 5% of the design discharge Slightly more than 5% of the design discharge ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering Self-cleansing velocity is Velocity at dry weather flow Velocity of water at flushing Velocity at which no accumulation remains in the drains Velocity of water in a pressure filter Velocity at dry weather flow Velocity of water at flushing Velocity at which no accumulation remains in the drains Velocity of water in a pressure filter ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering Lead acetate test in sewer manhole is done to test the presence of Carbondioxide gas Diesel vapours Hydrogen sulphide Methane gas Carbondioxide gas Diesel vapours Hydrogen sulphide Methane gas ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering Fresh sewage is generally Highly decomposed A source of objectionable odour Acidic Alkaline Highly decomposed A source of objectionable odour Acidic Alkaline ANSWER DOWNLOAD EXAMIANS APP
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