Analysis of the effect of internal gas pressure of an anaerobic digester on biogas productivity of a mixture of cow dung and tofu liquid waste

Biogas is one of alternative energy for tackling the energy crisis the longer fossil-fired on the wane. Besides, biogas can cope with the problem of air pollution, such as methane gas. Pollution from methane gas can be utilized by biogas as fuel. This study discusses a brief analysis of the effect of the internal gas pressure of an anaerobic digester on biogas production. The substrate used in this research as producing biogas is a mixture of cow dung/tofu liquid waste ratio of 2 (v/v). Therefore, the two identical biogases reactor with different treatments were developed, with (controlled) and without (uncontrolled) internal gas pressure treatment. The parameters such as temperature and methane gas amount were evaluated for nine days; moreover, the biogas production was monitored daily using a calibrated methane gas sensor. The uncontrolled biogas reactor produced methane gas lower than the controlled biogas reactor, 92074 ppm versus 254451 ppm, respectively, after nine days of reaction time. The uncontrolled biogas reactor's internal gas pressure was higher than the internal gas pressure of the controlled biogas reactor, 89.29 kPa versus 29.84 kPa, respectively, after nine days reaction time. The retention time of uncontrolled biogas production was longer than the retention time of biogas production of controlled biogas reactor, six days versus five days, respectively. The obtained results can be used to design an efficient anaerobic digester for treating, processing, and effectively utilizing organic waste.