Waste Water Engineering In the activated sludge process Sludge is activated by constant stirring Aeration is done with an admixture of previously aerated sludge Aeration is continued till stability Water is removed by centrifugal action Sludge is activated by constant stirring Aeration is done with an admixture of previously aerated sludge Aeration is continued till stability Water is removed by centrifugal action ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is None of these 200 ppm 250 ppm 225 ppm None of these 200 ppm 250 ppm 225 ppm ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is 0.5 0.25 0.1 0.05 0.5 0.25 0.1 0.05 ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering Self-cleansing velocity is Velocity of water in a pressure filter Velocity of water at flushing Velocity at which no accumulation remains in the drains Velocity at dry weather flow Velocity of water in a pressure filter Velocity of water at flushing Velocity at which no accumulation remains in the drains Velocity at dry weather flow ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering The sewerage system originates from House sewers Branch sewers Main sewers Lateral sewers House sewers Branch sewers Main sewers Lateral sewers ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering Cement concrete sewers are only suitable if non-scouring velocity is between 3.0 to 4.0 m/sec 4.5 to 5.5 m/sec 3.5 to 4.5 m/sec 2.5 to 3.0 m/sec 3.0 to 4.0 m/sec 4.5 to 5.5 m/sec 3.5 to 4.5 m/sec 2.5 to 3.0 m/sec ANSWER DOWNLOAD EXAMIANS APP
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