Q. Recirculation increases the efficiency of high rate trickling filters.

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Q. The surface loading rate of a secondary clarifier is ______ litres/m²/day.

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Q. The detention period of a secondary clarifier is ___________

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Q. Which of the following is the cause of rising sludge?

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Q. The minimum weir loading rate of primary clarifier is ____m³/m/day.

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Q. Hopper bottom vertical flow type tank is _____ in shape.

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Q. Which of the following is called as air diffusion method?

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Q. The maximum quantity of air required in diffused aerator is ______ m³ per million litres of sewage.

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Q. The effective area of the diffuser plate used in the aeration tank is ___________

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Q. The maximum depth of aeration tank used in activated sludge process is ___________

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Q. Which device is used in the aeration tank for cleaning purposes?

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Q. With how much pressure the air is filled in the aeration tank?

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Q. The effective area of tube diffuser used in the aeration tank is ___________

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Q. With which device, the air is introduced in the aeration tank?

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Q. The device used for the aeration in the combined aerator is ___________

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Q. The detention period of the Sheffield mechanical aeration tank is ___________

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Q. The minimum detention period of combined aerator is ___________

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Q. The speed at which the bubbles are formed in the simplex aerator?

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Q. Dorroco aerator is a type of ___________

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Q. Simplex aerator is a type of ___________

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