By fermentation using a non-oxygen or anaerobic conditions (Anaerobic digestion), and made the semi-fermented shifts (fed-batch fermentation) using microbial bacterial manure is a source for biogas production.
By anaerobic fermentation. Or in anaerobic conditions (Anaerobic digestion) and fermentation batch (fed-batch fermentation) using cow dung microbial leavening substrate to produce biogas.
The fermentation and anaerobic or anaerobic condition (Anaerobic digestion) and ferment semi-batch (fed-batch fermentation). Cow dung is the precursor by microbial fermentation biogas production