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Microbes in Human Welfare
Biogas Production
1 question from 1 paper, each with its answer.
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Concepts tested
- Lignin resists anaerobic digestion
All Questions
2003 AIPMT 1 question
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During anaerobic digestion of organic waste, such as in producing biogas, which one of the following is left undegraded : -In a biogas plant, anaerobic bacteria break down organic waste in stages: hydrolysis of complex polymers, acid formation, and finally methane formation by methanogens.
Carbohydrates such as cellulose and hemicellulose, and also proteins and lipids, are hydrolysed and fermented by the bacteria.
Lignin is a complex, highly cross-linked aromatic polymer found in wood. It is broken down mainly by aerobic fungi (white rot fungi) and is hardly degraded under anaerobic conditions.
So lignin is left undegraded and remains in the spent slurry.