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Environmental Engineering

Environmental Engineering
The velocity of flow of water in a sedimentation tank is about

15 to 30 cm/sec
15 to 30 cm/hour
15 to 30 cm/minute
5 to 10 cm/sec

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Environmental Engineering
Activated carbon is used for

Removing hardness
Removing odours
Disinfection
Removing corrosiveness

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Environmental Engineering
Composting and lagooning are the methods of

Sedimentation
Sludge digestion
Sludge disposal
Filtration

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Environmental Engineering
Period of cleaning of slow sand filters is about

2 - 3 months
1 - 2 year
24 - 48 hours
10 - 12 days

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Environmental Engineering
The type of valve, which is provided on the suction pipe in a tube-well, is

Sluice valve
Pressure relief valve
Reflux valve
Air relief valve

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Environmental Engineering
The working conditions in imhoff tanks are

Aerobic in lower compartment and anaerobic in upper compartment
Anaerobic only
Aerobic only
anaerobic in lower compartment and aerobic in upper compartment

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