During which stage of sewage treatment microbes are used [NCERT Pg. No. 154]

Biology · NEET · NTA ExamsMicrobes in Human Welfare

During which stage of sewage treatment microbes are used
    [NCERT Pg. No. 154]
  1. Primary treatment
  2. Secondary treatment
  3. Tertiary treatment
  4. All of these

Answer

(B) Secondary treatment

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