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Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYMicrobes in Human Welfare3 Marks
Question
  1. What is activated sludge? How is it produced?
  2. State some uses of biogas.
✓

Answer

  1. When the BOD ofefiluent is reduced significantly, it is then passed into a settling tank, where the bacterial 'flocs'' are allowed to sediment' This sediment is called activated sludge.
  2. The biogas thus produced is used for cooking and lighting.

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