EXAMIANS
The normal value of over flow rates for plain primary sedimentation tanks, ranges between
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The grit and silt of the grit chambers, may not be used for
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The maximum diameter of sewers adopted in the designs is
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A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is
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The sewer pipes
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For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is
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The porosity of sediments in sewer pipes, is usually taken as
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If the grit in grit chambers is 4.5 million litres per day, its cleaning is done
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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
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To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of
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