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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Q. In which of the following method, the sludge is rotated for dewatering process?

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Q. The dewatered sludge cannot be disposed by ___________

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Q. In which of the following process, the sludge is dried and disposed in land?

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Q. Which of the following is not a drying bed?

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Q. Which of the following is not suitable for dewatering of raw sludge?

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Q. Which of the following is not a part of dewatering process?

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