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  • Question

  • The moisture content of a sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is


  • Options
  • A. 25%
  • B. 50%
  • C. 10%
  • D. 5%.

  • Correct Answer
  • 50% 

    • Waste Water Engineering problems

    Search Results

    • 1. The first stage of neutral process of sludge digestion, is

    • Options
    • A. acid fermentation
    • B. acid regression
    • C. alkaline fermentation
    • D. none of these.
      • Discuss
    • 2. The average temperature of sewage in India, is

    • Options
    • A. 10°C
    • B. 15°C
    • C. 20°C
    • D. 25°C
    • E. 30°C.
      • Discuss
    • 3. PH value of sludge during alkaline regression stage, is

    • Options
    • A. more than 7
    • B. less than 7
    • C. less than 6
    • D. more than 6.
      • Discuss
    • 4. The rainfall at any place may be determined by

    • Options
    • A. its intensity
    • B. its direction
    • C. its frequency
    • D. all the above.
      • Discuss
    • 5. If q is the average sewage flow from a city of population P, the maximum sewage flow

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. The use of coarse screens for the disposal of sewage, may be dispensed with by

    • Options
    • A. comminutor
    • B. shredder
    • C. both (a) and (b)
    • D. neither (a) nor (b).
      • Discuss
    • 7. If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is

    • Options
    • A.
    • B.
    • C.
    • D. ?D.
      • Discuss
    • 8. For large sewers, maximum distance between manholes may be

    • Options
    • A. 50 m
    • B. 100 m
    • C. 200 m
    • D. 300 m
    • E. 400 m.
      • Discuss
    • 9. Pick up the correct statement from the following :

    • Options
    • A. The water supply pipes carry pure water free from solid particles
    • B. The water supply pipes get clogged if flow velocity is less than self cleansing velocity
    • C. The sewers may be carried up and down the hills and valleys
    • D. The sewer pipes are generally laid along level hills
    • E. None of these.
      • Discuss
    • 10. In trickling filter, B.O.D. is reduced to

    • Options
    • A. 30 to 40%
    • B. 40 to 60%
    • C. 60 to 80%
    • D. 80 to 90%
    • E. 95%.
      • Discuss

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