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.
Secondary sewage treatment is mainly a
NEET UG 2011 — Zoology Microbes in Human Welfare
2011mcqeasy
Secondary sewage treatment is mainly a
Official previous-year question
Held on 30 Apr 2011 · Verified 9 Jul 2026.
Options
- A
mechanical process
- B
chemical process
- C
biological process
- D
physical process
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