Which of these is not a method of digestion?

What is the temperature to be maintained for thermophilic digestion?

What is the rate limiting step in anaerobic digestion?

Secondary sludge constitutes which of the following?

What is the percentage of methane in the biogas?

Energy may be recovered from sludge as ____

Anaerobic digestion can be used to produce fuel.

What is the thickened concentration of chemical tertiary sludge( High lime)?