Q. Air is blown in the reverse direction during cleaning of filter beds.

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Q. At what pressure is the air blown during cleaning?

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

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Q. What is the rate of backwash water?

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Q. What is the size of the small rapid sand filter bed?

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Q. Pre-treatment of beds is not necessary.

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Q. What is the percentage of bacterial removal in filter beds?

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

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Q. What is the head loss found in a rapid sand filter?

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Q. What is the surface wash rate?

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

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Q. Even by high-rate of backwash, efficiency of cleaning is poor.

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Q. What is the air scour rate which is provided before a water backwash?

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Q. What is the depth of washing during high-rate water backwash?

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Q. What does sand filter remove?

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

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Q. While designing a sand filter what is the velocity that is assumed?

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Q. While designing a dual media filter what is the velocity that is assumed?

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Q. While designing a multimedia filter what is the velocity that is assumed?

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Q. Calculate the diameter of a sand filter with the following data.

Flow: 2200 m³/hr
Velocity: 12 m/hr

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