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Land Pollution - Pesticides and Biomagnificaiton

The function ...

Question

The function of sedimentation tank in sewage treatment is to:

A

disinfect the sewage

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B

aerate the sewage

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C

remove water content

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D

remove suspended solids

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Solution

The correct option is C remove suspended solids
A sedimentation tank allows suspended particles to settle out of water or wastewater as it flows slowly through the tank, thereby providing some degree of purification. A layer of accumulated solids, called sludge, forms at the bottom of the tank and is periodically removed.

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Q. After the conventional sedimentation treatment of sewage in the integrated method, the water released into

Q. From which one of these does sewage pass through to remove larger impurities?

(a) Vertical bars
(b) Grit chamber
(c) Aeration tanks
(d) Sedimentation tanks

Q. Assertion :Secondary treatment of sewage is also called biological treatment while primary treatment is called physical treatment. Reason: Primary sewage treatment depends only upon sedimentation properties of materials present in sewage and filtration.

Q. In which one of these is air blown onto the sewage?

(a) Grit chamber
(b) Aeration tanks
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Q. During secondary sewage treatment,
Flocs from the settling tank are sent for their digestion
Only a part of it is sent as inoculum in the aeration tank
Then the aeration tank is agitated where this inoculum multiplies for the development of flocs

I have a doubt,
Can we not transfer all the flocs from the sediment tank to the aviation tank and not just the small inoculum? Because now even if we don't agitate the aeration tank but allow the flocs in the aeration tank to break down the sewage the same process would occur in the aeration tank in a much less time and we would also be saving the energy spent in the agitation of aeration tank.

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Land Pollution - Pesticides and Biomagnificaiton

Standard XII Chemistry

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