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Environmental Engineering

Environmental Engineering
The chemical most commonly used to increase speed of sedimentation of sewage is

Lime
Sodium permanganate
Copper sulphate
Sulphuric acid

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Environmental Engineering
The rate of filtration in slow sand filters in million litres per day per hectare is about

100 to 150
50 to 60
500 to 600
1400 to 1500

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

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

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Environmental Engineering
The detention period in coagulation tanks is usually kept as

2 to 6 days
1 to 2 minutes
30 to 45 minutes
2 to 6 hours

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Environmental Engineering
Which of the following unit works in anaerobic conditions?

Sedimentation tank
Activated sludge treatment
Trickling filters
Sludge digestion tank

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Environmental Engineering
The length of rectangular sedimentation tank should not be more than (Where ‘B’ is the width of the tank)

8B
B
4B
2B

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MORE MCQ ON Environmental Engineering

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