The size of filter media in a high rate trickling filter is ___________
(a) 10-20mm
(b) 34-68mm
(c) 25-60mm
(d) 20-50mm
The question was posed to me in homework.
This is a very interesting question from High Rate Trickling Filter and Secondary Clarifier in division Sewage Filtration and Activated Sludge Process of Environmental Engineering