What are the three stages of biogas fermentation?

Biogas fermentation process is like a battle, which can be divided into "three major battles": the first battle, hydrolysis and liquefaction, which is the first stage of fermentation.

The second movement, acid production, is the second stage of fermentation. The task is to further convert the "prisoners of war" in the first battle into small molecular compounds and produce carbon dioxide and hydrogen at the same time. The "new force" is the "legion" of hydrogen-producing bacteria. Their task is to further transform the intermediate products that methanogens can't use into substances such as acetic acid, hydrogen and carbon dioxide, which are used as "munitions" of methanogens, providing raw materials for methanogens and preparing for the next stage of decisive battle. The first movement and the second movement are continuous, which is also called "no methane production stage". In fact, this is a processing stage of biogas raw materials.

The third battle, methane production, is the third stage of fermentation. The "main force" of this campaign is the "Legion" of methanogenic bacteria. Methanogenic bacteria are a kind of extremely ancient and special bacteria. They are the last fighters in the microbial food chain during biogas fermentation. According to the morphology, it can be divided into cocci, bacilli, octococci and spirillus. They unified the spoils of "methane-free production stage"-hydrogen, carbon dioxide, acetic acid, formate, ethanol and so on. , producing methane and carbon dioxide. Although their targets and substrates are different, their final results can be converted into methane. The whole biogas fermentation "war" ended successfully.