Avaliação econômica e análise técnica da produção de biogás via digestão anaeróbia da vinhaça

Abstract

The energy issue has always been present in history and has gone side by side to our technological development. If at first the use of non-renewable sources was the most exploited in industrial revolutions, the current context is to search for renewable and alternative sources. The diversification of the energy matrix and the best use of the production chain, adding value to by-products and waste, are focal points for humantechnological development in the coming decades. The objective of this work is the technical analysis and economic evaluation of different scenarios for the implementation of a biogas production plant using vinasse, residue from the sugar and alcohol production chain. For each scenario, the construction of a plant attached to the sugar-energy plant from which vinasse would be obtained at a flow rate of 7692 m3/day with biological oxygen demand (BOD) equal to 20000 mg/L and without acquisition costs. The biodigester chosen was the UASB mounted on systems of multiple reactors in parallel. Using the 2k planning concepts, the influence of initial chemical oxygen demand (DQO) (35 and 65 kg/m3) and hydraulic retention time (5 and 10 hours) on the daily production of biogas of the plant were evaluated. It was then possible to reach conclusions about initial investment costs and annual operating costs; estimated production revenue and net present value (LPV) economic valuation techniques and payback time.