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Estimate of the Volatile Solids Reduction Efficiency as a Function of the Hydraulic Retention Time and Substratum Temperature for Swine Wastes under Anaerobic Digestion Treatment

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

Citation:  Paper number  032268,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.14972) @2003
Authors:   Cecília de Fátima Souza, José Humberto Teixeira Santos, Williams P. M. Ferreira, Ricardo André Fiorotti Peixoto, Ilda de Fátima Ferreira Tinôco
Keywords:   Volatile solids reduction, modeling, anaerobic digester

Nowadays, the production processes already incorporate as basic elements, concepts of reduction of the pollution and of the environmental impact. Besides, in world level it happens the search for alternative sources of energy. In that context, to assist such needs, stands out the anaerobic digestion. In spite of being known since the century XVIII, the anaerobic digestion began to only be applied recently, being this fact attributed to the physical, chemistries and microbiological demands of the process. Several factors interfere in the success of the result, among which stand out the temperature and the hydraulic retention time, that are fundamental in the design of the system. In this work it was made analysis of the anaerobic digestion with purpose of determining parameters of design of the structures used in the process. For that, a laboratory scheme was used, consisting of 24 digesters whose total volume was 14 liters, being each one supplied with 10 liters of ending swine wastes, with initial total solids concentration of 6%. The system was submitted at four hydraulic retention times and three temperatures. As specific result, for the conditions of accomplishment of the experiment, a model of estimate of efficiency of the process was defined with base in the reduction of the volatile solids concentration, in function of the hydraulic retention time and temperature of the substratum.

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