Controle da volatilização de nitrogênio por meio da adição de superfosfato simples na compostagem de aves mortas e cama de frangos.

Abstract

In the intention of evaluating the composting as alternative of treatment and recycle the residues generated by broiler chicken, as well as minimizing the losses of the fraction nitrogen during the process, this work were development. Were evaluated the effects of the addition of simple superphosphate (SS) in the doses of 0, 5, 10 and 15% on the losses of N during the composting. SS was previously added the poultry litter, in respective doses, when drums, disposed in alternate layers with the birds died, in the proportion of 3:1 (poultry litter and birds, respectively). With the product of pre-composting were formed composting piles and monitored total solids (TS), volatile (VS), N, C, MOC and MORC (matter organic compostable and composting resistant, respectively), and COD (chemical oxygen demand). Were verified as results: increase of C/N relation in all treatments, independent of the doses SS added, contents of MORC above 40.0 %, during the period and medium reduction of 3.4% in the final concentration of COD, in relation to initial concentration. The largest reductions (P <0.05) of the amounts of N, ST and SV occurred in the treatments in that SS was added, in comparison with the treatment that didn't contain SS.