Question

The effective size of sand of the slow sand filter is __________

(a) 0.1-0.2mm

(b) 0.2-0.3mm

(c) 0.4-0.7mm

(d) 1-2mm

This question was posed to me during a job interview.

The above asked question is from Filter Media topic in portion Filtration of Environmental Engineering

Answer 1

Right option is (b) 0.2-0.3mm

The explanation: The effective size of sand of the slow sand filter is 0.2-0.3mm and for rapid sand filter, the effective size is 0.4-0.7mm.