Related Questions
During the primary treatment of sewage, solid particles that settle down are called
Activated sludge
Secondary sludge
Primary sludge
Anaerobic sludge
What are flocs?
Masses of anaerobic bacteria
Masses of aerobic fungi only
Masses of anaerobic bacteria, fungi
Masses of aerobic bacteria associated with fungi filaments
Primary treatment is the
Physical removal of large and small particles from sewage
Biological removal of large and small particles from sewage
Both (1) and (2)
Chemical removal of large and small particles from sewage
Sewage contains large amounts of …A… and …B… . Here A and B refers to
organic matter and disease-causing microbes
inorganic salts and heavy metals
radioactive isotopes and pesticides
plastics and industrial effluents
Waste water treatment generates a large quantity of sludge, which can be treated by
Anaerobic sludge digesters
Activated sludge
Chemicals
A gaseous mixture of ethane (C2H6) and propane (C3H8) occupies 44.8 L at STP. If the mass of the mixture is 80g, what is the mole fraction of ethane?
1/2
2/7
3/7
1/4
The density of an ideal gas at STP is 1.25 g/L. What is its molar mass?
14 g/mol
28 g/mol
42 g/mol
56 g/mol
The greater BOD of water relates
Increases oxygen content of water
Decreases oxygen content of water
The decrease of temperature of water
All of these
In the sewage treatment bacterial flocs are allowed to sediment in a settling-tank. This sediment is called as
Activated sludge
Primary sludge
Anaerobic sludge
Secondary sludge
In the biological treatment of sewage the masses of bacteria held together by fungal filament to form mesh like structures called as
Activated sludge
Aerobic process
Flocs
Anaerobic sludge
