BIOLOGY IN HUMAN WELFARE
MICROBES IN HUMAN WELFARE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Primary treatment
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Secondary treatment
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Tertiary treatment
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All of these
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Detailed explanation-1: -Following the aeration step, the microorganisms are separated from the liquid by sedimentation and the clarified liquid is secondary effluent.
Detailed explanation-2: -Secondary treatment involves the removal of biodegradable organic matter (BOD) and suspended solids (TSS) through the processes of aeration and filtration. Secondary treatment is typically characterized as producing a treated wastewater effluent with a BOD of 25 mg/L or less and TSS of 30 mg/L or less.
Detailed explanation-3: -So, the correct answer is ‘Aerobic bacteria and fungus’
Detailed explanation-4: -Secondary treatment removes dissolved and suspended biological matter, often using microorganisms in a controlled environment. Most secondary treatment systems use aerobic bacteria, which consume the organic components of the sewage (sugar, fat, and so on).