What is the effective size of sand used in rapid sand filters?

While designing an HRSCC what is the detention time assumed for the detention hood?

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

The spindle is provided at the __ to support perforated plates.

Which of these represent the settling velocity of tubesettlers?

The settling depth provided by tube settlers is _____ than the actual settling depth.

What is the porosity range during expansion of the filter bed?

What is the mathematical representation when many plates are used?