Discussion
Sludge from sewage treated plant is used to get methane using :
Answer: A
Methane is obtained with a sludge digester.
In anaerobic sludge digestion, the organic matter in sewage sludge is broken down in closed tanks without oxygen. Acid-forming bacteria and then methanogens convert it to biogas, typically 60 to 70% methane, which can be burnt to heat the digester or generate power.
Vacuum filtration and drying beds only dewater sludge and yield no gas. Composting is aerobic, so its carbon leaves mainly as carbon dioxide, not methane.
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