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Biology
Primary sludge
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Q. Primary sludge
Microbes in Human Welfare
A
possesses floes of decomposer microbes
44%
B
requires aeration for formation
19%
C
involves little decomposition
26%
D
forms during secondary sewage treatment
11%
Solution:
Primary sludge possesses floes of decomposer (aerobic) microbes, which consume a major part of the organic matter in the effluent to reduce the BOD.