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Potential of the Swine Waste as Substrate in Anaerobic Biodigestion Under Different Temperatures and Hydraulic Retention Times

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

Citation:  2007 ASAE Annual Meeting  074156.(doi:10.13031/2013.23265)
Authors:   Cecília de Fátima Souza, Cláudia Ribeiro dos Santos,, Keles Regina Antony Inoue, Ilda de Fátima Ferreira Tinôco, Cinara Siqueira Carvalho,
Keywords:   biogas, swine production, waste treatment

This study was carried out to evaluate the influence of the hydraulic retention time (HRT) of 10, 15, 25 and 30 days at the temperatures (T) 25, 35 and 40ºC with and without agitation (Ag) of the substrate on anaerobic biodigestion of the swine waste. The experiment was carried out during 6-month period, and the reactor starting period was 70 days approximately. Twenty four laboratory biodigesters with 10L useful volume each one were used, whereas finishing- swine waste were diluted into water with 6% total solids and used as substrate. To obtaining the desired temperatures, three batteries provided with eight biodigesters each one were set up inside fibrocement boxes containing 270 L water approximately. Water was heated by electric resistances, whereas the control of temperature in each box was performed by thermostats. The agitation was accomplished by blender motors set up in half of the biodigesters in each battery. At continuous operation phase or daily loads', the production potential was higher at 35oC temperature without substratum agitation at 30-day HRT, as registering an average potential of 0.136 m3 biogas.kg-1 waste.

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