Tratamento anaeróbico da fração sólida da cama de frango, após diluição, para obtenção de biogás e biofertilizante.

The current agricultural production model, despite constant advancements, still relay much on chemical fertilizers which usually comes from non renewable sources. For that fact, the use of organic fertilizers obteined from the anaerobic treatment of poultry slurry have been growing significantly, with the additional benefit of biogas production. A common practice in this method is the mixture of the poultry residue with water and subsequent segregation between the solid and liquid parts, from where the solution goes into biogestors and the solid part, which composition of thick particles and, therefore, low decomposition rate, is usually discarted without further use nor even proper neutralization. Aiming the assessment of the anaerobic processing of that solid part, the present paper describes the poultry slurry/water mixture by 3 distinct proportions, 1:3, 1:5 and 1:7, subsequent segregation using 2.36 mm mesh sieve, and subsequently anaerobic treatment of the withheld particles for 60 days. The experiment was conducted under completely randomized design with 3 repetitions. The results indicated the 1:3 partition as with the best whole solids grade and volatile solids on the liquid fraction, as well as the best reduction of organic carbon grade on the solids after the anaerobic digestion, proving to have the greater potencial in terms of biogas generation. Coincidentally, the 1:3 mixture provided a hydrogenionic potential within the suggest control parameters and the greatest reduction on organic carbon grade during the biodigestion process, indicating the best efficiency among the tested proportions and consequently preferable agronomic application. The anaerobic treatment for all proportions has shown to be evenly efficient for the reduction of the organic carbon grade of the solid fraction, although, the percentiles of whole solids and volatiles, before and after the digestion, had indicated that the material wasn't completely stabilized at 60 days, demanding corrections on the system for efficient treatment and harnessing of the biomass.