alleryThe remaining sludge is digested in tanks that are:
AFully dried
BAnaerobic
CAerobic one
DOpen to air
Answer & Solution
Correct answer: B. Anaerobic
1. Different microbes take over at this stage.
2. They work in the absence of oxygen.
3. So the tanks are anaerobic sludge digesters.
_Source: syllabus Biology, Chapter 10, Microbes in Human Welfare._
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