COMPARISON OF KINETIC MODELS FOR BIOGAS PRODUCTION RATE FROM SAW DUST

Manjula Das Ghatak, P. Mahanta

Abstract: In this study the effects of temperature on anaerobic co-digestion of saw dust with cattle dung is investigated. It also simulates the biogas production from saw dust with cattle dung at various temperatures. Results showed that high temperature could improve the anaerobic digestion and hence increase the biogas production rates. The operating temperatures used in this study were 35°C, 45°C, and 55°C. Modelling study revealed that exponential plot simulated better in both ascending and descending limb at all the three temperatures. However in ascending limb exponential plot was better for biogas production at 55°C and 35°C whereas in descending limb exponential plot was better for biogas production at 45°C. Gaussian plot had higher correlation at 35°C compared to other temperatures. Logistic growth model and modified Gompertz plot showed better correlation of cumulative biogas production than exponential rise to maximum plot for all the temperatures.

Keywords: anaerobic digestion, biogas production, kinetic model, simulation, co-digestion

DOI: https://doi.org/10.15623/ijret.2014.0307042