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Secondary Treatment

why is the tr...

Question

why is the treatment plant of sewage in the secondary process?speed up when aeration is improved.

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Solution

Microorganisms are one of the tool for removing waste from the water, used in the waste water tretment plant. Aeration speedup the treatment process because it provides proper amount of oxygen to microorganisms which will further increase their working speed and hence treatment process.

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Secondary sewage treatment in a sewage treatment plant is mainly a ______________ process.

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.

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.

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