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Biogas is a renewable energy source that is generated by the decomposition of organic waste in anaerobic process. The theoretical biogas potential is defined as the possible amount of gas production from biomass. This potential can be evaluated using various calculation methods each of which considers different parameters. The objective of this study was therefore to compare the potential of biogas energy generation from the livestock waste produced from the animal husbandry in Iran using different calculation methods. Using 4 methods of calculation indicated that the amount of 11.82, 5.25, 16.05 and 2.1 million ton of animal waste could be produced in Iran in 2016 with a biogas generation potential of 886.57, 173.36, 745.37 and 565.85 million m, energy equivalent of 5.14, 1, 4.32 and 3.28 thousand GWh and electricity generation of 1.59, 0.31, 1.34 and 1.02 thousand GWh. These amounts of electricity generation could provide 2.03%, 1.71%, 0.39% and 1.3% of the electrical energy consumed in household sector in 2016 in Iran, respectively. Furthermore the methane yield potential from the livestock manure with considering the different types of substrate (lipid, lignin, dry matter and cellulose) was evaluated. The highest methane yield was obtained from biochemical methane potential (BMP) value based on lipid and lignin content at 5.27E + 10 NL CH4 digester -1 day. The results showed that livestock waste is a low-cost and extensive source of renewable energy in Iran that can be used optimally for biogas energy and electricity generation. Also the treatment of huge amount of livestock manure in anaerobic digestion is helpful for reducing its polluting effects on the environment.

AN OVERVIEW OF ENERGY PRODUCTION FROM ANIMAL WASTE DURING IRAN’S ENERGY TRANSITION: IMPLICATION OF MANURE CHEMICAL COMPOSITION