NPTEL Water and waste water treatment Week 6 Assignment Answers 2024

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NPTEL Water and waste water treatment Week 6 Assignment Answers 2024

1. Select the correct option about phosphorous removal

  • PO43- consumed by bacteria in aerobic zone
  • Bacteria forms PHBs by fermentation byproducts in anaerobic zone
  • Polyphosphates break down and orthophosphates are released in the anaerobic zone
  • All the above
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2. Which of the following pair is not correctly matched

  • Trickling filter –> Attached growth system.
  • Activated sludge process –> Suspended growth system
  • MBBR –> More surface area to grow bacteria
  • Secondary Disinfection –> Inactivation of pathogens
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3. Which of the following form of chlorine disinfectant requires highest contact time to inactivate 99% bacteria

  • NH4Cl
  • OCl-
  • HOCL
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4. Identify the following wrong statements

  • In disc filtration aeration is controlled by rotation of discs
  • Na2SO3 removes free chlorine from the treated wastewater
  • Disinfection biproducts also form in drinking water
  • Presence of high concentration H2S and Fe2+ will increase the residual chlorine in treated wastewater
Answer :- 

5. UV disinfection process produces hydroxyl radicals in treated wastewater

  • True
  • False
Answer :- 

6.

NPTEL Water and waste water treatment Week 6 Assignment Answers 2024
Answer :- For Answer Click Here 

7. Choose the correct option by using the chlorination graph shown below

NPTEL Water and waste water treatment Week 6 Assignment Answers 2024
  • Break point chlorine dose =1.5 mg/l
  • Free residual chlorine = 1.2 mg/l
  • Combined residual chlorine = 0.5 mg/l
  • Total residual chlorine = 1.7 mg/l
  • All the above
Answer :- 

8. Select the following advantages of ozone treatment

  • No harmful disinfection biproducts
  • Improves the taste and odor
  • Cheaper than Chlorination
  • Requires less contact time
  • More disinfecting residual power
Answer :- For Answer Click Here