The Influence of Co-Fermentation of Agri-Food Waste with Primary Sludge on Biogas Production and Composition of the Liquid Fraction of Digestate

Energy self-sufficiency is a current trend in wastewater treatment plants. This effect can be achieved by increasing the production of electricity from biogas and reducing energy consumption for technological processes. One idea, line with circular economy concept, use waste rich organic matter as co-substrates fermentation process. The aim this study was to determine co-fermentation on nitrogen concentration reject water. A process flotate or vegetables increased compared primary sludge 162 180%, respectively. During tests, there no inhibition Hydrolysis compounds contained resulted significant increase ammonium (by 80–100%) dissolved 170–180%). methane rate well total release were calculated. An balance made, which took into account variable amount electric depending efficiency cogeneration systems supplying oxygen necessary remove positive obtained all analyses.