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Potential of production of biogas from the castor bean (Ricinus communis L.) cake

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1009213.(doi:10.13031/2013.29831)
Authors:   Elton Eduardo Novais Alves, Cecília de Fátima Souza, Keles Regina Antony Inoue, Tiago de Souza Leite
Keywords:   Residue, biodigestion, environment, biofuel, manure, waste, biogas plant.

The study of the potential for biogas production, for a particular residue, is very important, especially for the design of digesters and it has been doing for a long time. However, there are few studies related to the anaerobic digestion of the castor bean cake (CBC). Then, the aim of this study was to determine the potential of biogas production from the digestion of the CBC, with and without addition of animal wastes. The experiment was carried out at the Department of Agricultural Engineering, Federal University of Viosa. There were used nine bench digesters operating in batch way, containing 2 L of substrate. The three treatments were: CBC and water (A), CBC added with cow manure and water (B) and CBC added with swine manure and water (C). All treatments started at 9 dag kg -1 of Total Solids (TS) and three replications. The amount of manure applied corresponded to 15%, by weight, of the substrate TS. The experiment was finished after 56 days of digestion and it were carried out the TS analysis in three biofertilizers obtained. The treatment B showed the greatest potential to produce biogas, which were: 1.01 L L -1 of substrate, 3.18 L kg -1 TSreduced and 11.90 L kg -1 of CBC; in the treatment A it were: 0.55 L L -1 of substrate, 3.11 L kg -1 TSreduced, 5.50 L kg -1 of CBC; and in the treatment C it were: 0.50 L L -1 of substrate, 1.54 L kg -1 of TSreduced 5.91 L kg -1 of CBC. It was concluded that adding cow manure to castor bean cake in the process of digestion, result an increase in the biogas production potential and that this can be considered on the design of digesters.

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