Question

What do you mean by the term ”Backwashing”?

(a) Excluding intermittent use of compressed air during process

(b) Is a form of destructive maintenance

(c) Washing at the backside of the filter

(d) Including intermittent use of compressed air during the process.

The question was asked in an interview for job.

I would like to ask this question from Filtration in chapter Unit Operations of Bioprocess Engineering

Answer 1

The correct answer is (d) Including intermittent use of compressed air during the process.

To elaborate: In terms of water treatment, including water purification and sewage treatment, backwashing refers to pumping water backward through the filters media, sometimes including intermittent use of compressed air during the process. Backwashing is a form of preventive maintenance so that the filter media can be reused.