Pre-treatment of beds is not necessary.

As the compression increases, the porosity in filter bed _____

What is the bulk density of sand assumed while designing the amount required for a sand filter?

For rock type low filtration rate trickling filters what would be the organic loading rate assumed?

For roughing type trickling filters what would be the BOD removal rate?

Radial tube header is designed to remove ___

What would happen if the tube settler is inclined greater than 60 degrees?

__________ in trickling filter contains many species like bacteria and round worms.