Q. Calculate the flow rate of the backwash pump to be used for a pressure sand filter with the following data.

Flowrate: 2200 m³/h
Rise velocity of PSF (Pressure Sand filter): 10 m/h

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Q. Calculate the flow rate of the backwash pump to be used for a multimedia filter with the following data.

Flowrate: 2200 m³/h
Rise velocity of multimedia filter: 18 m/h

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Q. What is the bulk density of pebbles assumed while designing a Pressure sand filter?

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

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Q. Calculate the amount of pebbles required for the following data.

Flow: 200 m³/h
Velocity of dual media filter: 15m/h
Height: 0.6 m

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Q. Calculate the amount of sand required for the following data.

Flow: 200 m³/h
Velocity of dual media filter: 15m/h
Height: 0.4 m

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Q. Who used the trickling filter for the first time?

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Q. Splashing helps in improving aerobic conditions.

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Q. Trickling filter can also be called as a biofilter.

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Q. The supernatant from the tank flows into a ____

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

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Q. Which of the following is not used as a media for trickling filters?

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Q. Which of the following causes thickening of the biofilm?

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Q. What is the shape of a typical trickling filter?

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Q. What is the depth of the trickling filter?

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Q. The spindle is provided at the ______ to support perforated plates.

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Q. While designing a trickling filter what would be the depth assumed?

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Q. What is necessary prior to trickling filters?

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Q. Which type of bacteria are used in trickling filters?

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Q. For rock packing low- rate trickling filters what is the hydraulic loading assumed?

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