Question

The thickness of sand bed of a pressure filter is _____ cm.

(a) 10-20

(b) 20-30

(c) 30-50

(d) 50-60

The question was posed to me by my college director while I was bunking the class.

This intriguing question comes from Pressure Filter in chapter Filtration of Environmental Engineering

Answer 1

Right option is (d) 50-60

To explain I would say: The thickness of sand bed of a pressure filter is 50-60 cm, whereas the gravel layers of pressure filter are same as a rapid sand filter.