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Home Biochemical Engineering Water Treatment Comments

  • Question
  • The activated sludge process consists of returning a portion of the clarifier


  • Options
  • A. effluent water entering the reactor
  • B. influent water coming out of the reactor
  • C. influent water entering the reactor
  • D. effluent water coming out of the reactor

  • Correct Answer
  • influent water entering the reactor 


  • Water Treatment problems


    Search Results


    • 1. Secondary treatment uses __________ to consume wastes.

    • Options
    • A. micro-organisms
    • B. chemicals
    • C. filtration
    • D. none of these
    • Discuss
    • 2. The sterilization method depends

    • Options
    • A. nature of additive
    • B. volume and feed rate
    • C. both (a) and (b)
    • D. none of these
    • Discuss
    • 3. The filter material used for air filtration system is/are

    • Options
    • A. glass wool
    • B. glass fibre
    • C. norite
    • D. all of the above
    • Discuss
    • 4. The interception efficiency can be expressed as (where dp is the particle diameter and Dc cylindrical collection diameter)

    • Options
    • A. dp/Dc
    • B. dp x Dc
    • C. dp/Dc x 100
    • D. dpDc/100
    • Discuss
    • 5. The mechanical means of accomplishing sterilization of fermentation media/equipment is

    • Options
    • A. ultrasonic
    • B. radiation
    • C. chemical agents
    • D. none of these
    • Discuss
    • 6. Sanitizers used for rubber made equipments are

    • Options
    • A. strong acids
    • B. strong alkalis
    • C. combination of both
    • D. none of these
    • Discuss
    • 7. BOD stands for

    • Options
    • A. biochemical oxygen demand
    • B. british oxygen demand
    • C. british oxygen depletion
    • D. biological oxygen depletion
    • Discuss
    • 8. Which of the following substances are commonly used in a filter?

    • Options
    • A. Charcoal
    • B. Sand
    • C. Both (a) and (b)
    • D. Aluminum chloride
    • Discuss
    • 9. Sanitizer used specifically for vitreous enamel are

    • Options
    • A. strong alkalis
    • B. strong acids
    • C. weak alkali with sodium silicate
    • D. none of these
    • Discuss
    • 10. The activated sludge process is sometime referred as

    • Options
    • A. fluid bed biological oxidation system
    • B. fixed bed biological oxidation system
    • C. turning bed biological oxidation system
    • D. none of the above
    • Discuss


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