Which of the following bioenergy processes is performed in the absence of oxygen?
- pyrolysis
- torrefaction
- anaerobic bio-digestion
- all of the above
- pyrolysis and anaerobic bio-digestion
The percentage of moisture content in the biomass substrate for biogas production should be around?
- 90-92%
- 50-60%
- 20-22%
- 25-30%
- 10-12%