Produ??o de biogás por dejetos de ruminantes e monogástricos co-digeridos com manipueira

摘要

The aim of this study was to evaluate ruminant and monogastric animal manure co-digested with 10 % of manipueira through process monitoring parameters and biogas production. In this study, eight semi-continuous digesters, with a capacity of 7.8 liters of substrate in fermentation, operated with 30 days of hydraulic retention time, were used. Monitoring analyses were performed in order to assess: pH, total ammonia nitrogen (TAN) concentration, partial alkalinity (PA), content and biogas yield (m3·kg·Volatile Solids (VS)added-1). There was no statistic difference for all the pH values, which reached values around 6.8 to 8.0. For PA, all the substrates reached higher than 1.200 mg·L-1 values as recommended. During the process, there was no risk of failure due to TAN concentration. The average biogas productions accumulated per week were 0.00676; 0.01167; 0.01515 and 0.01856 m3 for substrates composed by dairy cattle, sheep, poultry and swine manure co-digested with manipueira, respectively. The biogas yield for those respective substrates were 0.122; 0.275; 0.535 e 0.843 m3·kg·VSadded-1. The highest biogas yield was obtained for anaerobic co-digestion of swine manure with 10 % (volume/volume) of manipueira.