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International Journal of Chemical Engineering
Volume 2014, Article ID 543529, 8 pages
http://dx.doi.org/10.1155/2014/543529
Review Article

Anaerobic Digestion and Biogas Production: Combine Effluent Treatment with Energy Generation in UASB Reactor as Biorefinery Annex

1Interdisciplinary Centre of Energy Planning, State University of Campinas (UNICAMP), P.O. Box 6166, 13.083-896 Campinas, Brazil
2Department of Electric Engineering, Federal University of Mato Grosso (UFMT), Avenida Fernando Corrêa da Costa 2.367, Boa Esperança, 78060-900 Cuiabá, MT, Brazil
3Department of Food Engineering, School of Food Engineering, University of Campinas (UNICAMP), Rua Monteiro Lobato, No. 80, 13083-862 Campinas, SP, Brazil

Received 28 March 2014; Revised 26 May 2014; Accepted 26 May 2014; Published 25 June 2014

Academic Editor: Diego T. Santos

Copyright © 2014 Mauro Berni et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The issue of residues and industrial effluents represents an unprecedented environmental challenge in terms of recovery, storage, and treatment. This work discusses the perspectives of treating effluents through anaerobic digestion as well as reporting the experience of using an upflow anaerobic sludge blanket (UASB) reactor as biorefinery annex in a pulp and paper industrial plant to be burned in the boilers. The performance of the reactors has shown to be stable under considerable variations in load and showed a significant potential in terms of biogas production. The reactors UASB treated 3600.00 m3 of effluent daily from a production of 150.00 tons. The biogas generation was 234.000 kg/year/mill, equivalent in combustible oil. The results of methane gas generated by the anaerobic system UASB (8846.00 kcal/m3) dislocate the equivalent of 650.0 kg of combustible oil (10000.00 kcal/kg) per day (or 234.000 kg/year). The production of 8846.00 Kcal/m3 of energy from biogas can make a run at industrial plant for 2 hours. This substitution can save US$ 128.700 annually (or US$ 550.0 of fuel oil/tons). The companies are invested in the use of the biogas in diesel stationary motors cycle that feed the boilers with water in case of storage electricity.