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How to solve this problem- Biochemical Oxygen Demand (BOD) valuecan be a measure of water pollution causedby the organic matter. Which of thefollowing statements is correct ?

Biochemical Oxygen Demand (BOD) value
can be a measure of water pollution caused
by the organic matter. Which of the
following statements is correct ?

  • Option 1)

    Aerobic bacteria decrease the BOD
    value.

  • Option 2)

    Anaerobic bacteria increase the BOD
    value.

  • Option 3)

    Clean water has BOD value higher
    than 10 ppm.

  • Option 4)

    Polluted water has BOD value higher
    than 10 ppm.

 
Answers (1)
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As we have learnt,

 

Biochemical oxygen demand (BOD) -

The amount of oxygen required for five days in one litre of water at 200 C for the microorganisms to metabolite organic waste.

- wherein

Clear water has BOD less than 5 ppm , highly polluted water has BOD of 17 ppm or more.

 

 Polluted water has BCD value higer than 10 ppm.

 


Option 1)

Aerobic bacteria decrease the BOD
value.

Option 2)

Anaerobic bacteria increase the BOD
value.

Option 3)

Clean water has BOD value higher
than 10 ppm.

Option 4)

Polluted water has BOD value higher
than 10 ppm.

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