The detention period for plain sedimentation water tanks, is usually

The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally

A

Less and more

B

Less and less

C

More and less

D

More and more

The overflow rate for plain sedimentation tanks is about

A

500 to 750 liters/hour/m²

B

1000 to 1250 liters/hour/m²

C

1250 to 1500 liters/hour/m²

D

1500 to 2000 liters/hour/m²

The normal value of over flow rates for plain primary sedimentation tanks, ranges between

A

25,000 to 35,000 litres/sqm/day

B

40,000 to 50,000 litres/sqm/day

C

50,000 to 60,000 litres/sqm/day

D

80,000 to 100,000 litres/sqm/day

The detention period in coagulation tanks is usually kept as

A

1 to 2 minutes

B

30 to 45 minutes

C

2 to 6 hours

D

2 to 6 days

In a sedimentation tank, the detention period for water ranges from __________ hours.

A

2 to 4

B

8 to 12

C

16 to 20

D

24 to 32

A rectangular tank 10 inch by 8 inch by 4 inch is filled with water. If all of the water is to be transferred to cube-shaped tanks, each one 3 inches on a side, how many of these smaller tanks are needed?

A

9

B

12

C

16

D

21

Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about

A

10 to 25

B

50

C

75

D

100

For a continuous flow type of sedimentation tanks

A

Width of the tank is normally kept about 6 m

B

Length of the tank is normally kept 4 to 5 times the width

C

Maximum horizontal flow velocity is limited to 0.3 m/minute

D

All the above

The maximum depth of sedimentation tanks is limited to

A

3 m

B

4 m

C

5 m

D

6 m

The maximum depth of sedimentation tanks, is kept

A

3 m

B

3.5 m

C

4 m

D

4.5 m

The detention period for plain sedimentation water tanks, is usually

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