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Which gas is produced in aerobic digestion of sludge?

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in Environmental Engineering by (81.4k points)
Which gas is produced in aerobic digestion of sludge?

(a) NO2

(b) CO2

(c) O2

(d) H2S

I got this question at a job interview.

This intriguing question comes from Mechanical Aeration System, Treatment of Sludge topic in division Sewage Filtration and Activated Sludge Process of Environmental Engineering

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Best answer
The correct option is (b) CO2

The best I can explain: Carbon dioxide gas is produced in the aerobic digestion of sludge by the oxidation of organic matter by bacteria into CO2.

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