DESENVOLVIMENTO DE BIODIGESTOR E AVALIAÇÃO DO DESEMPENHO PARA TRATAMENTO DE RESÍDUO SÓLIDO ORGÂNICO

The present work aimed to build and evaluate the efficiency of an anaerobic digester, for degradation of removal of organic matter from cattle manure. The biodigester was operated in three cycles, in a batch process, and the hydraulic retention time varied according to each cycle, with an average duration of 21 to 35 days. The waste characterisation was performed by sampling at the beginning, middle and end of each cycle. The following parameters were analyzed: temperature, pH, total solids (TS), volatile solids (VS), fixed solids (FS), humidity, chemical oxygen demand (COD), ammonia and biogas production. The results indicated that the anaerobic biodigestion process was efficient to degrade organic matter of cattle manure. For TS, VS, FS, humidity and COD maximums removals of 43.31%, 39.75%, 59.38%, 9.88% and 96.27% were achieved, for the effluent resulting from the digester. There was a significant increase in the production of ammonia nitrogen, reaching an maximums of 43.10%. The flame test was performed, proving the production of biogas. However, it was not possible to quantify the biogas production, due to possible leaks.