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Microbes in Human Welfare question

2011 · Q75
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Microbes in Human Welfare question

2011 · Q75

NEETBiologyMicrobes in Human WelfareMCQ+4 / −1
Secondary sewage treatment is mainly a :
  1. A
    Mechanical process
  2. B
    Chemical process
  3. C
    Biological process
  4. D
    Physical process
View written solutionFree

Correct answer: C

In secondary treatment mainly settled sewage flows to an aerobic biological treatment stage where it comes into contact with micro-organisms which remove and oxidise most of the remaining organic pollutants.

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