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  Biogas plants are often assumed to be simple systems: prepare feedstock, pump slurry into the digester, mix, wait for gas, purify, compress, and sell. In practice, this assumption is the root cause of failure. A biogas plant is fundamentally a biological reactor , not just a mechanical one. Gas production depends on the stability and performance of microbial populations. When biological limits are ignored, process efficiency collapses—regardless of equipment quality or automation. This will not happen initially. The actual affect will knock the door in a year or two. Why Methane Percentage Drops and CO₂ Increases Low methane content is not a gas purification problem; it is a process imbalance issue . Common technical causes include: • Feedstock imbalance High proportions of Napier grass or press mud or rice straw relative to dung increase volatile fatty acid (VFA) formation beyond methanogenic conversion capacity. Now, understand what is VFA (Volatile Fatty Acid)...