Q.

What are the product gases of anaerobic digestion?

A. carbon-dioxide and methane
B. methane and oxygen
C. oxygen and carbon-dioxide
D. nitrogen and methane
Answer» A. carbon-dioxide and methane
Explanation: over time, anaerobic bacteria and micro-organisms start to digest the settled sludge anaerobically, transforming it into co2 and ch4 and some heat. optimal physical treatment by sedimentation takes place when the flow is smooth and undisturbed.
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