Q. The BOD after the filtration of sewage from the low rate trickling filter is ___________

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Q. The efficiency of a percolating filter is given by ___________

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Q. The removal of BOD is independent of the loading conditions in infiltration process.

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Q. The organic loading in low rate trickling filter is 900 kg/hectare-meter/day. What is the efficiency of the filter?

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Q. The organic loading in a trickling filter is measured in ___________

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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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