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MCQs

Total Questions : 80 | Page 2 of 8 pages
Question 11. What is the range of MLSS concentration in oxidation ditch?
  1.    500-1000 mg/L
  2.    1000-2000 mg/L
  3.    2000-4000 mg/L
  4.    3000-5000 mg/L
 Discuss Question
Answer: Option D. -> 3000-5000 mg/L
Answer: (d).3000-5000 mg/L
Question 12. What is the velocity of wastewater within the ditch?
  1.    0.5 ft/s
  2.    0.7 ft/s
  3.    5 ft/s
  4.    2 ft/s
 Discuss Question
Answer: Option D. -> 2 ft/s
Answer: (d).2 ft/s
Question 13. Which of the following process is not adopted in oxidation ditches?
  1.    Adsorption
  2.    Desorption
  3.    Oxidation
  4.    Decomposition
 Discuss Question
Answer: Option B. -> Desorption
Answer: (b).Desorption
Question 14. Which of the following is MLSS concentration not dependant upon?
  1.    Surface area of sedimentation
  2.    Rate of return sludge
  3.    Aeration process
  4.    Number of bar screens
 Discuss Question
Answer: Option D. -> Number of bar screens
Answer: (d).Number of bar screens
Question 15. Oxidation ditch uses ______ to remove biodegradable organics.
  1.    Long SRTs
  2.    Short SRTs
  3.    pH
  4.    chemicals
 Discuss Question
Answer: Option A. -> Long SRTs
Answer: (a).Long SRTs
Question 16. Which of the following is not true regarding mechanical aeration?
  1.    Increases oxygen
  2.    Enhances efficiency
  3.    Reduces HRT
  4.    Increases HRT
 Discuss Question
Answer: Option D. -> Increases HRT
Answer: (d).Increases HRT
Question 17. What is the outlet of TSS in ppm obtained when aerated lagoons are used for treatment?
  1.    500-700
  2.    100-400
  3.    700-900
  4.    900-1200
 Discuss Question
Answer: Option B. -> 100-400
Answer: (b).100-400
Question 18. While designing the aerated lagoon what is the solid retention time considered?
  1.    7-8 days
  2.    3-6 days
  3.    1-2 days
  4.    10 days
 Discuss Question
Answer: Option B. -> 3-6 days
Answer: (b).3-6 days
Question 19. What is the ratio of VSS/TSS in ppm obtained when partially mixed lagoons treatment are carried out facultatively?
  1.    20-30
  2.    40-50
  3.    50-80
  4.    80-100
 Discuss Question
Answer: Option C. -> 50-80
Answer: (c).50-80
Question 20. What is the ratio of VSS/TSS in ppm obtained when aerated lagoons are used for treatment?
  1.    10-20
  2.    20-30
  3.    70-80
  4.    80-100
 Discuss Question
Answer: Option C. -> 70-80
Answer: (c).70-80

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