Regarding Methanogens and biogas generation, which statements are true?
a. Methanogens are found in the rumen of cattle and the anaerobic sludge during sewage treatment.
b. Methanobacterium is a common methanogen that helps in the breakdown of cellulose.
c. The biogas plant is 10-15 feet deep and uses a slurry of dung and bio-wastes.
d. The gases produced (methane, CO2, H2) are inflammable and can be used for cooking and lighting.
e. The spent slurry from the biogas plant is disposed of as waste.
