Modeling the Kinetics of Methane Production from Slaughterhouse Waste and Salvinia Molesta: Batch Digester Operating at Ambient Temperature

摘要

The aim of this study is to analyze the biogas production by fermentation of Slaughterhouse Waste and Organic waste. Data used are collected through three experiments at ambient temperatures of study site. The method used allows determining the physicochemical characteristics of substrates and the composition of the biogas produced. In addition, a comparative study of six kinetics models of cumulative methane production was carried out. Physicochemical characteristics of the substrates showed that the substrates, which have high content of volatile solids, showed almost no methane production potential, contrariwise the substrates, which have a volatile solids content of about 50%, showed significantly high methane production potential. Cow rumen fluid (CRF) and cow manure (CM) are the only ones that showed significant methane production potential at ambient conditions compared with other substrates. Sheep manure (SM) and Salvinia molesta (SAM) showed the longest delay phase, implying that they are not easily degradable. The digestion temperature has the same profile as the ambient temperature whatever the substrate. Also, the obtained pH range (6.1 - 7.2) is within the desirable operating range. All models has attained significant prediction of the methane potential. The best rRMSE (0.076 and 0.162) and R~(2) (0.998 and 0.991) were observed for Logistic and Gompertz models, respectively. Hashimoto's model presented the best estimation of kinetic parameters.