Discussion
Anaerobic digestion is chosen for sludge rather than aerobic treatment mainly because it
Answer: C
Correct answer: needs no aeration and yields usable gas
Aeration is the largest energy cost at a works, and anaerobic digestion avoids it entirely while producing methane that can run the plant. The trade is that digestion is slow - twenty to thirty days - and needs heating and mixing, and it reduces rather than eliminates the pathogens.
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