Encontro de Energia no Meio Rural Agrener
REGO, Erik Eduardo and HERNANDEZ, Francisco Del Moral. Eletricidade por digestão anaeróbia da vinhaça de cana-de-açúcar: contornos técnicos, econômicos e ambientais de uma opção. In Proceedings of the 6. Encontro de Energia no Meio Rural, 2006, Campinas (SP, Brazil) [online]. 2006 [cited 19 May 2013]. Available from: <http://www.proceedings.scielo.br/scielo.php?script=sci_arttext&pid=MSC0000000022006000100053&lng=en&nrm=iso> .
In its first part this article brings up the growing importance of biomass in Brazilian and within the world energy scenario, especially due to the higher environmental consciousness related to the use of renewable energy sources. It also discusses about biomass sustainability and its myths. The Brazilian case shows that the usage of Biomass is mixed to the use of sugar cane. The studies in this area are essentially directed to the production of ethanol and the burn of the solid waste production in steam generators. This article focuses on a specific liquid effluent product: the vinnasse. The use of vinasse in agriculture as liquid fertilizer is not new. This article studies the technical, economical and environmental viability of the biogas production obtained from the anaerobic digestion of vinasse in order to generate electricity. The reactor under analysis is the UASB (Upflow Anaerobic Sludge Blanket ) and a case study of a experimental process linked to alcohol production is used as a base to put side by side some points of view. Finally this article discusses how environmental regulations related to the effluent disposal (and their differences between two States in Brazil) were really trade-offs issues in the decision making from the economical perspective. The combinations of the analysis (technical, economical and environmental) contributes for the global dimension of the alternative.
Keywords : vinhaça; biogás; biodigestão; açude; UASB.