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Bubble columns, are used for?

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Bubble columns, are used for?

(a) Waste water treatment

(b) Effluent treatment

(c) Chlorine treatment

(d) Sodium treatment

The question was asked in a job interview.

The question is from Packing Types and Objectives in portion Packing Design and Operation of Distillation Design

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Right option is (a) Waste water treatment

To explain: The main use of bubble column are the aerobic fermenters and are secondarily used a waste water treatment while for chlorine and sodium treatment are done in an agitated vessel.

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