The grit chambers of sewage treatment plants, are generally cleaned after

Fine grit present in sewage is removed in the __________ during sewage treatment.

A

Grit chamber

B

Detritus tank

C

Trickling filter

D

Skimming tank

__________ substances present in sewage are removed in grit chamber during sewage treatment.

A

Organic

B

Fatty

C

Inorganic

D

Dissolved

Generally the detention period for grit chambers is kept as

A

1 minute

B

5 minutes

C

24 hours

D

12 hours

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

A

Filtration

B

Digestion

C

Sedimentation

D

Both B and C

In a grit chamber of a sewage treatment plant,

A

Flow velocity 0.15 m to 0.3 m/sec is kept

B

Depth of 0.9 m to 1.20 m is kept

C

One minute of detention period is kept

D

All the above

The recommended detention period for grit chambers is

A

1 minute

B

2 minutes

C

3 minutes

D

5 minutes

What is the name of two chambers of Swiss federal chambers-

A

Senate and House of representatives

B

House of Lords and House of Commons

C

National Council and Council of States

D

None of these

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

Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is

A

H₂

B

CH₄

C

CO₂

D

N₂

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 grit chambers of sewage treatment plants, are generally cleaned after

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