Q. Gravity thickening can achieve up to _____ solid fraction.

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Q. ________ is oxidized by heterotypic micro-organisms.

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Q. What is autotrophic biomass made up of?

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Q. What is the temperature at which sludge constituting biosolids are composted?

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Q. For how many days the sludge constituting biosolids is subjected to composting?

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Q. What is the final water content of sludge after dewatering?

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Q. To what temperature is a sludge constituting liquid biosolids heated in order to treat it?

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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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