Environmental Engineering Archives

The working conditions in imhoff tanks are_______________?

The working conditions in imhoff tanks are_______________?

A. aerobic only
B. anaerobic only
C. aerobic in lower compartment and anaerobic in upper compartment
D. anaerobic in lower compartment and aerobic in upper compartment

The working conditions in imhoff tanks are_______________? Read More »

Environmental Engineering

The detention period for oxidation ponds is usually kept as______________?

Environmental Engineering / admin

The detention period for oxidation ponds is usually kept as______________?

A. 4-8 hours
B. 24 hours
C. 10 to 15 days(Correct)
D. 3 months

The detention period for oxidation ponds is usually kept as______________? Read More »

Environmental Engineering

The main disadvantage of oxidation pond is that________________?

Environmental Engineering / admin

The main disadvantage of oxidation pond is that________________?

A. large area is required for construction(Correct)
B. maintenance and operation cost are high
C. BOD removal is very low
D. none of the above

The main disadvantage of oxidation pond is that________________? Read More »

Environmental Engineering

Sludge volume index is defined as the ratio of_______________?

Environmental Engineering / admin

Sludge volume index is defined as the ratio of_______________?

A. percentage of sludge by volume to percentage of suspended solids by weight(Correct)
B. percentage of sludge by volume to percentage of total solids by weight
C. percentage of suspended solids by weight to percentage of sludge by volume
D. percentage of total solids by weight to percentage of sludge by volume

Sludge volume index is defined as the ratio of_______________? Read More »

Environmental Engineering

When there is no recirculation of sewage, then recirculation factor is_______________?

Environmental Engineering / admin

When there is no recirculation of sewage, then recirculation factor is_______________?

A. 0
B. 1
C. infinity
D. none of the above

When there is no recirculation of sewage, then recirculation factor is_______________? Read More »

Environmental Engineering

The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called_______________?

Environmental Engineering / admin

The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called_______________?

A. waste pipe
B. soil pipe
C. vent pipe
D. antisiphonage pipe

The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called_______________? Read More »

Environmental Engineering

Most of the bacteria in sewage are______________?

Environmental Engineering / admin

Most of the bacteria in sewage are______________?

A. parasitic
B. saprophytic(Correct)
C. pathogenic
D. anaerobic

Most of the bacteria in sewage are______________? Read More »

Environmental Engineering

A pipe which is installed in the house drainage to preserve the water seal of traps is called______________?

Environmental Engineering / admin

A pipe which is installed in the house drainage to preserve the water seal of traps is called______________?

A. vent pipe
B. antisiphonage pipe
C. waste pipe
D. soil pipe

A pipe which is installed in the house drainage to preserve the water seal of traps is called______________? Read More »

Environmental Engineering

The process of lagooning is primarily a means of________________?

Environmental Engineering / admin

The process of lagooning is primarily a means of________________?

A. reducing the excessive flow in sewers
B. disposing of sludge
C. increasing the capacity of storage re-servoirs
D. increasing flow of sewage through imhoff tanks

The process of lagooning is primarily a means of________________? Read More »

Environmental Engineering

The gas from sludge digestion tank is mainly composed of __________________?

Environmental Engineering / admin

The gas from sludge digestion tank is mainly composed of __________________?

A. nitrogen
B. carbon dioxide
C. hydrogen sulphide
D. methane(Correct)

The gas from sludge digestion tank is mainly composed of __________________? Read More »

Environmental Engineering