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Discuss and compare the sludge retention time (SRT) as a design parameter for the following biological...

Discuss and compare the sludge retention time (SRT) as a design parameter for the following biological systems with:

a.      Carbon removal

b.      Nitrification

c.      Biological Phosphorous removal

Engineering   Civil-Engineering   
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Answer #1

Sludge Retention Time(SRT):-

The Sludge Retention Time (SRT) is the average time for which the activated-sludge solids remains in the system.

The SRT is an important design and operating parameter for the activated-sludge process and is usually expressed in days.

● The minimum SRT for carbon removal is less than 1 day but the high rate range of 2–3 days.

● SRT of 7 to 10 days at 10°C is required, for conventional nitrification.

● A SRT more than 12 days is necessary to complete the biological phosphorus removal.

Thank you.

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