Q. The process of removal of water from the sludge is called ______

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Q. In which sludge treatment process, the sludge is treated with chemicals?

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Q. How many stages are there in the sludge digestion process?

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Q. The form of sludge which is free from pathogenic bacteria is ___________

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Q. The BOD of supernatant liquor in a sludge digestion process is ____ ppm.

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Q. Which of the following is correct regarding pH in different stages of the sludge digestion process?

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Q. Which gas evolves the most in the sludge digestion process?

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Q. Which of the following is incorrect about aerobic digestion in the sludge digestion process?

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Q. The color of digestive sludge is ___________

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Q. Which of the following is correct regarding anaerobic digestion in the sludge digestion process?

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Q. The maximum temperature at which thermophilic microorganisms remain active in sludge digester is ___________

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Q. Which of the following is obtained in the secondary tank in two stage sludge digester?

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Q. The high rate sludge digestion tanks are used when the capacity of the tank is ____ million liters per day.

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Q. In which of the following, both primary and secondary tanks are used?

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Q. The minimum size of sludge digestion tank is ___________

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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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