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Cattle waste has Chemical Oxygen Demand (COD) several times higher than Biochemical Oxygen Demand (BOD) because of:

  1. A
    high levels of fibre.
  2. B
    high levels of microflora.
  3. C
    high levels of cellulose, lignin and fibre.
  4. D
    All of the above

Solution & Step-by-step Explanation

Cattle waste contains high concentrations of complex organic compounds such as cellulose, hemicellulose, lignin, and plant fibers. These substances are non-biodegradable or decompose very slowly by biological means, resulting in a lower Biochemical Oxygen Demand (BOD). However, they can be completely oxidized chemically, which leads to a significantly higher Chemical Oxygen Demand (COD) value compared to the BOD value.

Practice this question

Try it yourself before checking the explanation above.

Cattle waste has Chemical Oxygen Demand (COD) several times higher than Biochemical Oxygen Demand (BOD) because of:
A
high levels of fibre.
B
high levels of microflora.
C
high levels of cellulose, lignin and fibre.
D
All of the above

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Waste ManagementWater PollutionCOD and BOD

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