Biodigestão anaeróbia de efluente de abatedouro avícola

Abstract

The aim of this work was to evaluate the process of anaerobic biodigestion on treatment of broiler slaughterhouse effluent, considering TRH of 7, 14 and 21 days, and also the adding of lypolitic enzyme to the substrata at concentrations of 0; 0.05; 0.10 and 0.15% of volume of load that supplied biodigestors. The influence of TRH and the adding of lypolitic enzyme to the substrata on anaerobic biodigestion process was evauated by biogas and CH4 production, potential production by DQO added and reduced, as well by reduction of contents of DQO, concentrations of N, P and K and of pH values. Obtained results showed that there was influence of TRH (in which TRH 7 expressed the best results, for weekly average production of biogas with 40,7 L and CH4 with 32,2 L) and of enzyme doses with the highest values of production for treatments 0,10 (24,6 L) and 0,15% (26,2 L), which did not differ among each other. Enzyme levels of 0,10 and 0,15% showed the greatest potentials of biogas (7,8 and 7,3 L, respectively) and methane (6,6 and 6,7 L, respectively) production per added DQO, when compared the levels of 0,05% (5,4 and 4,6 L, respectively) and 0 (4,9 and 3,8 L, respectively). The highest remotions of DQO were reached with the dose of 0,05% (83,3%) and TRH of 21 days (74,4%). The pH was influenced as by RRH (6,8; 7,0 and 7,0, for periods of 7, 14 and 21 days, respectively) as by enzyme doses (7,0; 7,0; 6,9 and 6,9 for levels 0; 0,05; 0,10 and 0,15, respectively), even so obtained values for both characteristics are inside considered ideal range (6,7 up to 7,5). However, for more efficiency on energetic recycling, it is recommended the use of levels up to 0,10% of enzyme and time of hydraulic retention of 7 days.