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a
has high BOD as it has heterotrophic bacteria.
b
is processed initially by aerobic microbes and later treated by anaerobes in sewage treatment plants.
c
is first given biological treatment and later physical treatment.
d
is treated only to digest the dissolved organic matter.
answer is B.
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Detailed Solution
In biological treatment of sewage initially aerobes are involved in digesting the dissolved organic matter and later anaerobes are used to treat the flocs.