The aim of this work was to evaluate the interference of a diet based on sorghum in substitution of corn in the compound and treatment of waste. Twenty four batch digesters of bench with capacity of 12 liters, from which 12 were provided with swine waste that were fed with a diet base on corn and the others with a diet based on sorghum. At every 30 days, 3 digesters of each diet were emptied, in a total of 4 hydraulic retention times (HRT): 30; 60; 90 and 120 days. For evaluating the efficiency of anaerobic biodigestion process, reduction of total solids, total volatile solids, chemical demand of oxygen, biochemical demand of oxygen, the most probably number (NMP) of total and thermo tolerant coliforms, besides potentials of biogas and methane production were evaluated. Results showed that swine waste that were fed with diets based on sorghum, presented a smaller efficiency of the process, mainly for potentials of biogas and methane production. In average, potentials were 8.6% smaller (P<0.01) than potentials that were obtained from biodigestors provided with swine waste that were fed with diet based on corn. Regarding to NMP of total and thermo tolerant coliforms, only significative reductions were observed as increase HRT.
swine breeding; tannin; methane; coliforms
