On-farm micro biogas plant for energy and nutrient recycling in Poland

This document details the operation of a 10–50 kW on-farm micro biogas plant at a 430-hectare cattle farm in Poland, managed by Ryszard Strug. The system uses cattle slurry as the sole feedstock in a mesophilic digester, producing biogas with 60% methane and 40% carbon dioxide. The biogas powers two 11 kW electric generators, while waste heat from engines and exhaust systems is recovered to heat the digester and supply hot water. A carbon filter and air lock treat the biogas before use. Digestate is stored and applied to fields as fertilizer. The plant enhances energy self-sufficiency, supports nutrient cycling, reduces greenhouse gas emissions, and exemplifies rural prosumerism and sustainable bioeconomy practices within a multi-actor framework.