Resumo:
Anaerobic digestion is a complex process that depends on varying distances
such as average pH, temperature, system agitation, toxicity, substrate type, maximum
volumes and valves, organic loading rates and also carbon / nitrogen ratio (C / N). . The
latter, in turn, was the central point in the development of the work. This ratio affects how
bacteria in different stages of digestion and, depending on the unbalanced concentration
of carbon and nitrogen, can affect inhibited energy metabolism in biogas production.
Thus, in this licensed work, if you are going to study the coding study of a project with
two co-substrates (corn silage and elephant grass) and an additive (charcoal), use the
method of obtaining and increasing biogas production. Four possible scenarios are
calculated, based on the substrates, co-substrates and additives indicated above,
considering the production and sale of electricity through the energy compensation
system. From an environmental perspective of Life Cycle Analysis or the result presented
in Scenario II, the result of the best results for Global Warming Potential, Acidification,
Eutrophication, Human Toxicity and Photochemical Oxidation was presented. Scenario
III, in turn, shows the best result in the Ozone Layer depletion impact category and
Scenario IV for Abiotic Depletion (Fossil Fuels). From the economic analysis performed,
it was found or increased the biogas production and also the economic viability of the
project with codigestion, and the scenario II (swine manure and elephant grass silage)
was the one that presented higher profitability compared to Net Present Value and
Scenario I (Supported Views) Show higher IRR for assumed propositions. Scenario
shows an IRR of 21.69% and return on return on invested capital (TRC) of 6.2 years,
while Scenario II shows an IRR of 21.14% and TRC of 6.5 years. Scenario III (swine
manure and corn silage) and scenario IV (swine manure and charcoal) did not find
economic viability. Finally, the Sensitivity Analysis performed in relation to economic
viability is calculated on the analyzed parameters, but it has greater sensitivity regarding
the variation of the price of electricity.
