Answer:
(a) Sludge is further treated by anaerobicdigesters.
These are large heated tanks in which its chemical decomposition is catalyzed by
microorganisms.
The liquid is treated by bacteria which
breakdown the organic matter remaining in solution. It is then sent to
oxidation ponds where heterotrophic bacteria continue the breakdown of the organics
and solar UV light destroys the harmful bacteria. Chemical are not used in there
treatments.
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