Q. The range of temperature at which mesophilic microorganism becomes active in sludge digester is ___________

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Q. The sludge digestion process is independent of which of the following?

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Q. Which of the following is the correct expression of the aeration period in hours?

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Q. Which of the following activated sludge process has minimum food to microorganism ratio?

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Q. The maximum aeration period for a conventional activated sludge system is ___________

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Q. The organic loading in an activated sludge plant is defined as ___________

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Q. _________ is defined as a volume in ml occupied by 1 gram of solid in the mixed liquor after 30 minutes of settling.

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Q. The design value of food to microorganism ratio in the tapered aeration sludge process is ___________

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Q. Which of the following sludge process has maximum aeration period?

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Q. The maximum BOD removal efficiency of the Step aeration process of the activated sludge system is ___________

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Q. BOD of sewage is dependent on food to microorganism ratio.

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Q. _________ is the time at which sewage is detained in the aeration tank.

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Q. Which of the following has minimum hydraulic retention time?

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Q. The design solid surface loading in an activated sludge process is ___________

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Q. Which of the following plant nutrient is not found in municipal sewage?

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Q. The design pressure of ____ is applied on pressure type flotation device.

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Q. The design Hydraulic loading rate of the gravity thickener is _______ m³/m²/day.

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Q. Which of the following process is not involved in sludge thickening?

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Q. 7% of solids concentration of thickened sludge is obtained from gravity thickener. What is the type of sludge?

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Q. Which of the following is not used for drying of sludge?

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