Wastewater treatment

#Here’s a quick reply to #1: Hydrolytic fermentation stage. Complex organic substances are first broken down into simpler organic compounds under the action of extracellular enzymes produced by anaerobic bacteria; for example, cellulose is hydrolyzed into simpler sugars； Proteins are converted into simpler amino acids ； Lipids are converted into fatty acids and glycerol, etc. These simple organic compounds are then, under the action of acid-producing bacteria, transformed through anaerobic fermentation and oxidation into fatty acids such as acetic acid, propionic acid, butyric acid, and alcohols. 2. Hydrogen and acetic acid production stage. Hydrogen and acetic acid-producing bacteria convert the intermediate products generated in the first stage, such as fatty acids like propionic acid and butyric acid as well as alcohols, into acetic acid and hydrogen, with carbon dioxide being produced as a byproduct. 3. Methane production stage. In this stage, methanogenic bacteria convert acetic acid, hydrogen, carbon dioxide, and other substances produced in the first and second stages into methane