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Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYMicrobes in Human Welfare2 Marks
Question
What is the key difference between primary and secondary sewage treatment?
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Answer

Primary (1°) treatment is a physical process that involves for removal of particulate as settelable particle. Secondary (2°) treatment is purely a biological treatment involving microbial oxidation.

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