Q. What does OTR stand for?

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Q. Which of the following is not a standard condition for aeration?

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Q. What is the symbol used to define the ratio of the process to clean water mass transfer?

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Q. _________ is the actual mass of oxygen transferred per unit time.

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Q. High solubility of CO₂ ______ pH.

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Q. What is the range of pH above which aeration is required?

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Q. H₂S is highly soluble in water.

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Q. Which of the following is not used for iron removal?

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Q. How many types of aerators are present?

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Q. Calculate the theoretical oxygen requirement for the following details.

Flow: 200 m³/h
BOD load: 800 mg/L

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Q. Calculate the amount of air required for the following details.

Flow: 300 m³/h
BOD load: 800 mg/L

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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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