Q. At what temperature the sludge constituting biosolids is heated, when it is treated by the pasteurization method?

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Q. What is the solid retention time assumed when the sludge constituting biosolids is treated anaerobically?

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Q. Which of the following methods is used in both dewatering and thickening?

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Q. For a return activated sludge pump what is the type of pump preferred?

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Q. For removing the digested biosolids which type of pump is preferred?

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Q. Which type of pump is preferred to remove trickling filter humus?

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Q. Why is the sludge aerated?

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Q. ________ is treated in activated sludge reactor.

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Q. After the treatment, the BOD demand ______

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Q. Which is the next reactor after activated sludge reactor in the treatment process?

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Q. Where is the sludge at the bottom of the clarifier processed to?

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Q. Which of these is not an alternative to activated sludge treatment systems?

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Q. An activated sludge system consists of two components, an aerator and ________

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Q. How is air pumped in the aerator unit?

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Q. Which are the three ingredients in activated sludge systems?

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Q. Mechanical stirring can be done instead of injection of air from the bottom.

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Q. The sludge particles concentration is increased by the growth of the organism in aeration tanks.

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Q. The organisms feed on _____ in aeration tanks.

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Q. Calculate the volume of the aeration tank required for the following data:

Flow: 800 m³/d
BOD: 1000 mg/L
F/M ratio: 0.15(extended aeration)
MLSS: 3500 mg/L

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Q. Sewage treatment plant is a part of secondary treatment.

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