The coagulant which is generally not used for treating the sewage, is

Which of the following is used as a coagulant in treating turbid water?

A

Chlorine

B

Ferric sulphate

C

Calcium sulphate

D

Activated carbon

Why is Ferric ammonium sulfate generally not used as a coagulant?

A

It is very expensive

B

It is dependent on the Dissolved oxygen present in the waste water

C

It is a very slow process

D

It works only at high pH

Which of the following is an anaerobic process for treating sewage?

A

Oxidation pond

B

Imhoff tank

C

Oxidation ditch

D

Rotating Biological Contactors

For treating the sewage of a large city, you will recommend

A

A sedimentation tank and an activated sludge treatment plant

B

A plant consisting of Imhoff tanks with low rate trickling filters

C

Sedimentation tanks with high rate trickling filters

D

None of these

The hollow rhizomes of the reeds generate a hydraulic pathway thereby treating sewage by ___________

A

Flocculation

B

Bacterial activity

C

Precipitation

D

Sedimentation

The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is

A

5 m

B

5.5 m

C

6.5 m

D

7 m

Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is?

A

Centrifugal pump

B

Pneumatic ejector

C

Reciprocating pump

D

None of these

Which of the following pumps is used to pump sewage solids with liquid sewage without clogging the pump is?

A

Centrifugal pump

B

Pneumatic ejector

C

Reciprocating pump

D

None of these

The presence of which of the following in sewage indicates nitrogen content before decomposition of sewage?

A

Nitrites

B

Nitrates

C

Free ammonia

D

Albuminoid nitrogen

During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.

A

Filtration

B

Digestion

C

Sedimentation

D

Both B and C

The coagulant which is generally not used for treating the sewage, is

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