Q187 / 200 · NEET 2011 (Screening) · Zoology

Secondary sewage treatment is mainly a

  • A
    mechanical process
  • B
    chemical process
  • Correct answer
    C
    biological process
  • D
    physical process

Solution

In secondary or biological treatment of municipal waste rich in sewage, the organic matter is decomposed with the help of microbes. Decomposition of organic matter occurs by one of the three methods-water hyacinth pod, trickling filter method and activated sludge method. After decomposition the treated water is sterilized through chlorination.

Hence, the correct answer is option: 'C'.

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