Which of the following is not true of aerobic digestion ?

1.	Which of the following is not true of aerobic digestion ?
A.	It generates most sludge
B.	It generally incurs higher running cost
C.	It may generate a usable fuel
D.	Requires a shorter residence time
Answer» D. Requires a shorter residence time

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Which of the following is not true of aerobic digestion ?

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