Q. What is the surface area of the River rock (Large) packing material used in trickling filters as the packing medium?

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Q. The settling tank which is followed after the Trickling filter has which of the following characteristic?

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Q. What is the maximum reduced concentration of BOD obtained at the outlet of tricking filter?

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Q. High rate filtrations cannot be used for wet weather conditions.

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Q. What is the filter media made of?

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Q. Filter cycle is interrupted for ______

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Q. ________ is shifted to keep an ample space for filtering media to rotate.

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Q. What is the void ratio of filter media?

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Q. The synthetic fibres used are temperature resistant.

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Q. Which of the following is not true in case of closing the top of the vessel?

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Q. As the compression increases, the porosity in filter bed _____

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Q. What is the life of the media used?

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Q. What is the percentage of wash water?

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Q. Which of these does high rate filters not remove?

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Q. Which of these has been used as a medium for high rate filtration?

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Q. What is the porosity of these synthetic media?

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Q. While designing a high rate filter what would be the velocity assumed?

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Q. For a high rate filter calculate the diameter of the filter required for a flow of water of 200 m³/h.

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Q. What is the bed depth of the sand considered in such rapid filters?

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Q. Which is the special feature of secondary clarifier?

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