Once BOD from the sewage is reduced \( \mathrm{P} \) significantly,...

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Once BOD from the sewage is reduced
\( \mathrm{P} \) significantly, the flocs are allowed to sediment and

W it is known as
(1) Primary sludge
(2) Secondary sludge
(3) Activated sludge
(4) Inactivated sludge.
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