Q. The hydrogen sulfide gas formed during the filtration of sewage can be removed by ___________

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Q. The recirculation factor in a low rate trickling filter is ___________

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Q. The maximum removal of suspended and dissolved impurities from the sewage is?

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Q. The color of the secondary sludge produced from the high rate trickling filter is ___________

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Q. _______ is the ratio of volume of recirculated sewage to the raw sewage.

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Q. The range of organic loading in kg/hectare metre/ day in a high rate trickling filter is ___________

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Q. The expression of the recirculation factor F is given by ___________

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Q. The size of filter media in a high rate trickling filter is ___________

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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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