What is the angle at which a tube settler is usually inclined at?

While designing a blower for backwash for sand filters without air scouring what is the velocity considered?

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

The synthetic fibres used are temperature resistant.

Calculate the diameter of a sand filter with the following data. Flow: 2200 m3/hr Velocity: 12 m/hr

What is the specified minimum time for backwash of rapid filters?

Calculate the area of the tube settlers for the given data: Flow: 1500 mm3/h Surface loading rate: 7 m2/m3/h

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