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

Flow: 300 m³/h
BOD load: 800 mg/L

View solution

Q. Calculate the number of diffusers for the following.

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

View solution

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

Flow: 300 m³/h
BOD load: 1000 mg/L

View solution

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

Flow: 500 m³/h
BOD load: 800 mg/L

View solution

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

View solution

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

View solution

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

View solution

Q. ________ is oxidized by heterotypic micro-organisms.

View solution

Q. What is autotrophic biomass made up of?

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

Q. Why is the sludge aerated?

View solution