STUDY OF THE TECHNICAL AND ECONOMIC FEASIBILITY OF USING BIOGAS ENERGY FROM ANAEROBIC DIGESTION OF PIG MANURE WITH MAGNETITE ADDITION IN BRAZIL.

This research aimed to evaluate, from real data, the potential of energy generation from the anaerobic digestion of pig manure enhanced with magnetite addition. The study performed by Córdova et al. (2020) achieved maximum methane generated value of 3.82.10^-2 Nm³CH₄/kgVS (1.97.10^-4 Nm³CH₄/kg substrate) with the addition of 8 g of magnetite. From this value, for a variable number of pig heads at different ages, we perform the calculations of obtaining power and energy and the economic feasibility calculations using the Net Present Value (NPV) and the Levelized Cost of Energy (LCOE). The analyses considered the premises of the micro and mini generation regulation of renewable energy distributed by the Brazilian National Electric Energy Agency. Besides, the GHG avoided emissions in the Brazilian National Interconnected System (NIS) by using this type of renewable energy was calculated. The results showed that under the analyzed scenario, farms from 360,400 pig heads would produce 586.43 ton/year of manure, whose anaerobic digestion will produce 42,167.35 Nm³CH₄/year (equivalent to 60,299.31kg/year of liquefied petroleum gas), 100.64kWh/year of electric energy (NPV = $2.12 and LCOE = 100.5US$/kWh). This number of pig heads could avoid 22.09tCO₂/year, and for 981,000 heads, this value would be 60.14tCO₂/year. [ABSTRACT FROM AUTHOR]