Activated sludge should have the ability to settle quickly so that it can

Be rapidly pumped back from sedimentation tank aeration tank.

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Absorb pathogenic Bactria present in waste water while sinking to the bottom of the settling tank

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Be discarded and anaerobic ally digested

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Absorb colloidal organic matter

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Solution

The correct option is B Be rapidly pumped back from sedimentation tank aeration tank.
Activated sludge should have the ability to settle quickly so that it can be rapidly pumped back from sedimentation tank to the aeration tank, where it can start the process of decomposition of the organic matter again. Activated sludge has filamentous bacteria that are capable of performing the aerobic digestion of organic waste is the sewage water.
Hence, the correct answer is 'Be rapidly pumped back from sedimentation tank aeration tank'

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Similar questions

Q. Assertion: A major part of the activated sludge is pumped into large tanks called anaerobic sludge digesters.
Reason: During anaerobic digestion, the anaerobic bacteria digest the organisms present in the primary sludge.

Q. Particles intended to be removed in a continuous flow water sedimentation tank, should have settling velocity.

Q. What is added to the water treatment tank to settle the colloidal particles?

Q. Write one word for each of the following.

1.	Dirty water	....................
2.	Impurities in wastewater	....................
3.	The chemical process of waste water treatment plant	....................
4.	Wastewater that contains suspended impurities	....................
5.	The material that settles at the bottom of sedimentation tanks	....................
6.	Material that rises to the top in sedimentation tanks	....................

Some students of class 7 were taken for an educational trip to Waste water treatment plant .The teacher explained the process of water treatment. Identify the correct order of the process.

Step I:The liquid material is passed through sedimentation tank where solid waste like faecal matter, sand, grit settles down.

Step II:This solid matter is then removed with the help of a scrapper. This is the sludge.

Step III: Waste water is passed through bar screens to remove big objects like cans, sticks, rags etc.

Step IV: A skimmer removes the floatable solids like oil, grease etc.

Step V: Air is pumped into clarified water to help aerobic bacteria to grow. The bacteria then consume the unwanted matter still present in clarified water.

Step VI: The clear water so obtained is called clarified water.

Step VII:The suspended microbes settle at the bottom & the water is removed from the top.

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