While designing a blower for backwash for sand filters with air scouring what is the velocity considered?

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

For rock type of roughing packing trickling filter what will be the hydraulic loading rate?

What does EDI stand for?

What is the TSS at the outlet of the Pressure Sand Filter (PSF)?

What is the rate of backwash water?

For rock type of packing in intermediate filtration trickling filters what is the hydraulic rate considered?

Which of the following causes thickening of the biofilm?