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KLa is different in between Air-lift reactors and bubble columns?

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KLa is different in between Air-lift reactors and bubble columns?

(a) True

(b) False

The question was asked in examination.

I would like to ask this question from Oxygen Transfer in Fermenters topic in portion Mass Transfer of Bioprocess Engineering

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Correct option is (a) True

The explanation: In air-lift fermenters, Medium circulation is also accomplished with bubble formation. kLa obtained in air-lift reactor will be less than bubble fermenter due to shorter contact time between bubble and medium.

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