This paper aims to review the perspectives and barriers before production of biogas from animal manure in Bulgaria. The share of methane emissions from the agricultural sector in Bulgaria occupies 18 % and stored animal manure is its biggest source. The use of animal manure for production of biogas could reduce these emissions. Biogas market in Bulgaria is not well developed yet, but the potential of biomass for biogas production is promising. Residues and waste from animal production as well as crop residues are important renewable energy sources for Bulgaria as raw materials for biogas production. Animal manure availability from cattle-and pig-and poultry farms in Bulgaria are presented. The content of N, P and K in the manure is discussed in view of further use of the residues of biogas production as soil nutrients. Advantages and barriers to biogas production in Bulgaria are discussed. Presented data reveal a promising resource for biogas production by anaerobic digestion. The total energy of methane from pig manure is estimated to the value 6703 PJ.
Currently, an awareness of the chemical industry towards the furanic compounds production, renewable molecules alternatives to fossil molecules, which can be transformed into a wide range of chemicals and biopolymers.
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