A. [(100 + P1)/(100 – P2)] V1
B. [(100 – P1)/(100 + P2)] V1
C. [(100 – P1)/(100 – P2)] V1
D. [(100 + P2)/(100 – P1)] V1
Related Mcqs:
- 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_______________?
A. 25 %
B. 50 %
C. 10 %
D. 5 % - The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is____________________?
A. 100 cm
B. 110 cm
C. 120 cm
D. 150 cm - Acid regression stage of sludge digestion at a temperature 21°C extends over a period of______________?
A. 15 days
B. 30 days
C. 60 days
D. 90 days - In normal conditions, the period for sludge digestion, is_______________?
A. 10 days
B. 20 days
C. 30 days
D. 60 days - The first stage of neutral process of sludge digestion, is__________________?
A. Acid fermentation
B. Acid regressio
C. Alkaline fermentation
D. None of these - The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is____________________?
A. 30 minutes
B. 1 hour
C. 1 hour and 30 minutes
D. 2 hours - In a sludge tank, the gas mainly produced, is_________________?
A. Oxygen
B. Nitrogen
C. Hydrogen
D. Carbon dioxide - To maintain aerobic biological activity, the moisture content of the compost mass should be about_________________?
A. 45 %
B. 50 %
C. 55 %
D. 60 % - In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is____________________?
A. Q/(B × D)
B. Q/(L × D)
C. Q/L
D. Q/(B × L) - The sludge does not contain waste water from_________________?
A. Bath rooms
B. Wash basins
C. Kitchen sinks
D. Toilets
