Environmental Engineering The velocity of flow of water in a sedimentation tank is about 15 to 30 cm/sec 15 to 30 cm/minute 15 to 30 cm/hour 5 to 10 cm/sec 15 to 30 cm/sec 15 to 30 cm/minute 15 to 30 cm/hour 5 to 10 cm/sec ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The hourly variation factor is usually taken as 1.8 1.5 2.0 2.7 1.8 1.5 2.0 2.7 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The rate of filtration in slow sand filters in million litres per day per hectare is about 1400 to 1500 50 to 60 100 to 150 500 to 600 1400 to 1500 50 to 60 100 to 150 500 to 600 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as 8.5 to 10.0 10.5 to 12.0 6.5 to 8.0 4.5 to 6.0 8.5 to 10.0 10.5 to 12.0 6.5 to 8.0 4.5 to 6.0 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be 400 ppm 100 ppm 300 ppm 200 ppm 400 ppm 100 ppm 300 ppm 200 ppm ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering Sewage treatment units are normally designed for 15 - 20 years 5 - 10 years 28 - 30 years 15 - 28 years 15 - 20 years 5 - 10 years 28 - 30 years 15 - 28 years ANSWER DOWNLOAD EXAMIANS APP
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