Q. How many stages are there in the sludge digestion process?

View solution

Q. The form of sludge which is free from pathogenic bacteria is ___________

View solution

Q. The BOD of supernatant liquor in a sludge digestion process is ____ ppm.

View solution

Q. Which of the following is correct regarding pH in different stages of the sludge digestion process?

View solution

Q. Which gas evolves the most in the sludge digestion process?

View solution

Q. Which of the following is incorrect about aerobic digestion in the sludge digestion process?

View solution

Q. The color of digestive sludge is ___________

View solution

Q. Which of the following is correct regarding anaerobic digestion in the sludge digestion process?

View solution

Q. The maximum temperature at which thermophilic microorganisms remain active in sludge digester is ___________

View solution

Q. Which of the following is obtained in the secondary tank in two stage sludge digester?

View solution

Q. The high rate sludge digestion tanks are used when the capacity of the tank is ____ million liters per day.

View solution

Q. In which of the following, both primary and secondary tanks are used?

View solution

Q. The minimum size of sludge digestion tank is ___________

View solution

Q. The range of temperature at which mesophilic microorganism becomes active in sludge digester is ___________

View solution

Q. The sludge digestion process is independent of which of the following?

View solution

Q. Which of the following is the correct expression of the aeration period in hours?

View solution

Q. Which of the following activated sludge process has minimum food to microorganism ratio?

View solution

Q. The maximum aeration period for a conventional activated sludge system is ___________

View solution

Q. The organic loading in an activated sludge plant is defined as ___________

View solution

Q. _________ is defined as a volume in ml occupied by 1 gram of solid in the mixed liquor after 30 minutes of settling.

View solution