Question

What is biological oxygen demand test? At what stage of sewage treatment is this test performed? BOD levels of three samples of water labeled as A,B and C are 30mg/ml,10mg/ml and 500mg/ml respectively. Which sample of water is most polluted?

Answer 1

Answer:

The BOD test measures the rate of oxygen uptake by microorganisms in a sample of water. This test is performed during secondary treatment or Biological treatment, Sample C is most polluted because it has the highest BOD levels among the three samples of water.

Answer 2

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