Q. The effective area of tube diffuser used in the aeration tank is ___________

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Q. With which device, the air is introduced in the aeration tank?

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Q. The device used for the aeration in the combined aerator is ___________

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Q. The detention period of the Sheffield mechanical aeration tank is ___________

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Q. The minimum detention period of combined aerator is ___________

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Q. The speed at which the bubbles are formed in the simplex aerator?

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Q. Dorroco aerator is a type of ___________

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Q. Simplex aerator is a type of ___________

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Q. Which gas is produced in aerobic digestion of sludge?

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

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Q. Which of the following is the final stage in the sludge treatment process?

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Q. In which sludge treatment process, the organic solids are converted into more stable form?

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Q. The sludge treatment process to increase the solid content of sludge is ___________

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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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