Volatile fatty acids (VFAs) are intermediate products formed during the anaerobic digestion process, specifically during the acidogenesis stage. Acidogenesis is the breakdown of complex organic matter into simpler organic acids. Accumulation of VFAs indicates an imbalance in the digester's microbial community. Anaerobic digestion relies on a consortium of bacteria working in sequence. The first group, fermentative bacteria, produce VFAs. A second group, methanogens, then convert these VFAs, along with hydrogen and carbon dioxide, into methane gas. If the methanogens a....
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