Avaliação do pré-tratamento termoquímico de cama de frango para produção de biogás

Abstract

Poultry production has increased in large proportions in all of Brazil over the years, especially in the southern region of the country, being a producer of waste activity, such as poultry litter. One way of poultry litter the destination is used in digestion anaerobic processes for biogas production, however, their degradation by this process is time consuming mainly by the presence of lignocellulosic materials. Thus, this study aimed to evaluate the effect of thermochemical pretreatment in poultry litter using sodium hydroxide to generate methane by biochemical methane potential test (BMP). Poultry litter is pretreated by addition of 8 mL of sodium hydroxide with a concentration of 15 g L -1 for each 2 g of added total solids (6% NaOH g -1 ST added ) in three temperature conditions: 22 ° C for a period of 3 days at 70 ° C for 24 hours and 100 ° C for 24 hours. The poultry litter untreated and pretreated were subjected to test potential Biochemical Methane (BMP) for 18 days to evaluate production of methane. The bed pretreated chicken at 70°C showed cumulative volume of methane of approximately 1418 mL N , around 3.5 times greater than the cumulative yield of untreated poultry litter. The comparison between treated poultry litter and pretreated, indicated that the pre-treatment of poultry litter at 70 ° C is of the most appropriate option because the generation of methane per gram of volatile solids was higher than the other experiments.