Avaliação da cama de aviário como substrato para digestão anaeróbia

Abstract

The poultry activity generates a lot of waste, among them, the aviary bed stands out. This residue, if not treated correctly, has a high potential to impact on the environment and public health. One of the ways of treatment for this residue is the biogas production by anaerobic biodigestion, process of degradation of the organic matter in absence of oxygen. In this context, the present work evaluated the process of biogas production through the liquid fraction, from the mixture of aviary bed with addition of water in different times of agitation. To perform this work, two bed samples, one of chicken and one of turkey were used, which were extracted in aviaries located in southwest of Paraná, reused by seven and four lots, respectively. The samples were submitted to mixing tests in the ratio of 1: 6.5 with a speed of 200 rpm and 3 different stirring times with the aid of the microprocessor stirrer. After that, analyzes of total solids (ST), fixed solids (SF) and volatile solids (SV) present in the two phases, supernatant and solid, were performed after shaking and also for in natura bed. Based on the results, it is concluded that the best stirring time for extracting the organic matter from the solid phase to the supernatant is 1 hour for the chicken bed and 0.5 and 1 hour for the turkey bed. The stirring time of 0.2 hour did not influence this extraction, because the volatile solids found were smaller than in natura bed.