Question

why is air along with microorganisms bubbled into the sewage treatment tanks.
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Answer 1

Answer:

This is because air and “seed” sludge from the plant treatment process are added to the wastewater to break it down further. Air pumped into large aeration tanks mixes the wastewater and sludge that stimulates the growth of oxygen-using bacteria and other tiny organisms that are naturally present in the sewage

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