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BIOGAS PRODUCTION SUSTAINABILITY CIRCLES 2021 http://ezaposleni.singidunum.ac.rs/rest/sciNaucniRezultati/oai/record/1/8704 G. Dražić N. Dražić N. Rakašćan L. Živanović The conversion of biomass energy in a biotechnological process based on the anaerobic digestion (AD) process was developed primarily as a renewable energy source (RES) with the initial goal of reducing greenhouse gas emissions into the atmosphere and thus mitigating climate change. The basic raw material is biomass of different origin: from livestock production / manure and animal residues /, from crop production / harvest residues, purpose-grown biomass of energy crops /; wastes from the food processing industry; biodegradable municipal waste, waste sludge from biological wastewater treatment plants and more. The main product in the AD process is biogas which can be further purified and used as a substitute for natural gas in stable and mobile systems or its energy is converted in cogeneration plants into electricity and heat energy. As a byproduct, a digestate is formed (residue in the fermenter after the separation of biogas) which contains significant amounts of mineral nutrients for plants. Digestate is most often used as soil amendment, directly or after certain processing. When digestate is used as a substitute for mineral fertilizers on plots where agro-energy crops are grown, the cycles of mineral substances and carbon are closed. In order for this to be sustainable from the ecological, energy and economic aspect, a multidisciplinary and multisectoral approach is necessary. conferenceObject 53 63 IRASA International Scientific Conference SCIENCE, EDUCATION, TECHNOLOGY AND INNOVATION SETI III 2021 Book of Proceedings