Complex valorization of waste from the alcohol production industry

The study addresses the technological valorization of agro-industrial residues generated as a result of the integrated activity of a cattle farm and an ethyl alcohol distillery, in the context of the transition to a circular bioeconomy. The experiment was implemented within the enterprise SRL "Garma Grup", which uses a continuous anaerobic digestion system for the conversion of a homogeneous mixture of cereal bran and cattle manure into biogas. The objective was to evaluate the influence of dihydroxyfumaric acid (DHFA) on the efficiency of the anaerobic digestion process under industrial conditions. The results confirmed the hypothesis regarding the stimulating effect of DHFA on the microbiological activity in the acidogenesis and methanogenesis stages. The enterprise implemented an integrated biogas purification system, which allowed the reduction of the level of impurities to safe thresholds from an operational point of view. The study confirmed the feasibility of circular bioeconomy strategies, the need to deepen the biochemical mechanisms involved, as well as economic assessments.