Determination of the biochemical methane potential of swine hydrolyzate

Swine farming generates remains of births and animals that die during the process. Implementing a plan to eliminate these materials by hydrolysis process results in an animal by-product called swine hydrolyzate. The treatment of this by-product through its application in the anaerobic digestion process can also represent its conversion into a resource for energy production. Thus, the present study focuses on this by-product as a potential substrate for anaerobic digestion, evaluating the methane production potential. The results show biogas production with an average methane content of about 70%. Theoretical biochemical methane potential was 967.95 ± 0.11 mL g VS-1, which represented a bioconversion efficiency of 59.97 ± 3.54% and 62.26 ± 0.43%, considering the experimental results of 580.47 ± 34.29 mL g VS-1 and 602.67 ± 4.16 mL g VS-1, respectively. By comparing the experimental biochemical methane potential with the predicted value using the modified Gompertz model, it was possible to conclude that the maximum methane production rate was 73.46 ± 0.36 mL g VS-1 day-1, with a digestion time of 18 days to obtain 90% of the methane production potential.