The document describes the three processes involved in biogas production through anaerobic digestion: 1) hydrolysis where bacteria break down carbohydrates, proteins, and lipids into simpler molecules; 2) acidogenesis where bacteria convert the simpler molecules into acids, hydrogen gas, and carbon dioxide; 3) methanogenesis where methanogenic bacteria convert the byproducts into methane gas, carbon dioxide, and water.

1. Biogas Production

2. Anaerobic digestion Biogas Production involves in three
processes :
i. Hydrolysis or solublization : In initial stage raw material
(cattle dung) is mixed with water in equal proportion to
make slurry which is then fed into the digester.
Here anaerobic hydrolytic bacteria (e.g.Clostridium,
Pseudomonas) hydrolyse carbohydrates into simple sugars,
proteins into amino acids and lipids into fatty acids.
carbohydrates simple sugars
proteins amino acids
lipids fatty acids.

4. ii. Acidogenesis : In this stage, facultative anaerobic, acidogenic
bacteria and obligate anaerobic organisms, convert simple
organic material into acids like formic acid, acetic acid, H2 and
CO2
simple organic material formic acid,
acetic acid,
H2 and CO2

6. iii. Methanogenesis : This is last stage in which anaerobic
Methanogenic bacteria like Methanobacterium, Methanococcus
convert acetate, H2 and CO2 into Methane, CO2 and H2O and
other products.
Acetate, H2 and CO2 Methane, CO2 and H2O