The world population, since the 1960, has increased significantly. Currently, the planet
has 7.2 billion inhabitants. With this increase in population, electric power generation,
food production, solid waste generation and, consequently, the burning of fossil fuels
that are responsible for the emission of so-called greenhouse gases (GEE) and are
directly related to the intensification of the greenhouse effect and the occurrence of
climate change. The generation and use of biogas is consolidated as an important
alternative for the process of environmental sustainability. The significant agricultural
and livestock production indicates a significant potential of biogas production from
waste from the slaughtered animals, using biogas, instead of fossil fuels. In this context,
the present study aimed to estimate the biomass energy production, evaluating the
technical and economic feasibility of the system. For technical feasibility, a time series
was presented using the Integrated Automatic Regressive of Moving Average (ARIMA)
model for monthly forecast of slaughtered animals, production of biomass and electric
energy. Economic viability was evaluated through investment analysis indicators: Net
Present Value (VPL); Internal Rate of Return (TIR) and Payback Period. The ARIMA
linear autoregressive method generated data within the 95% confidence interval. The
model was significant, between observation and projection of the series, which was
practically constant for the forecast horizon of six months. The values resulting from the
analysis of the economic viability were favorable, presenting discounted payback of
8.11 years, TMA of 5% and TIR of 9.78%. The study demonstrated that there is a
technical and economical feasibility in the implementation of a biodigestion system
using humid residues from cattle refrigerators, making possible to improve the use of
this important source of renewable energy.
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