Anaerobic digestion for the production of renewable energy
Abstract
Besides treating effluents, biodigesters produce biogas for the generation of electrical or thermal energy. Few data on the operation of these full-scale reactor models are known. Current study evaluated an integrated system for primary separation of solids in a sieve, followed by anaerobic treatment of dairy cattle manure in a pond-type covered biodigester, at 32-day retention time and slug recirculation. Systems were operated on a full scale for 8 months. The volumetric production of biogas varied according to the applied organic loads (115 - 295 kg DQO d-1), with rates between 0.030 and 0.175 m³ m-3 d-1 and CH4 concentrations between 54 and 70%. Rates between 380 and 2,806 m³ month-1 were reported for monthly biogas production, equivalent to an energy potential between 2,070 and 19,168 kWh month-1. Mean removals of BOD5.20 and DQO were 75.8 and 70%, respectively. NH4 rates increased after anaerobic digestion process. Further, pH rates were always close to neutrality and alkalinity was maintained at rates favorable to anaerobiosis. Results indicated good treatment efficacy in the removal of organic matter. It also ensured energy and agricultural recovery of the effluent, shown by the reduction of production costs in the livestock sector with the benefit of renewable energy production.References
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