Q. Calculate the number of diffusers for the following.

Blower Flow rate: 535 m³/hr
Coarse diffusers are used.

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Q. Calculate the number of fine diffusers required for the following data.

Flow: 300 m³/h
BOD load: 1000 mg/L

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Q. Calculate the amount of air required for the equalization tank with the following details:

Flow: 500 m³/h
BOD load: 800 mg/L

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Q. The Activated Sludge Process is a _______ wastewater treatment process.

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Q. The measure of pH is the ______ ion concentration.

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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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