Development of a Compact-Sized Biodigester for Pig Manure and Organic Wastes with Raspberry Pi-Based Temperature, Pressure, and pH Level Monitoring

Nowadays, biogas is more necessary to use than fossil fuels because it is a renewable energy. To produce biogas, a biomass feedstock should undergo fermentation known as anaerobic digestion. The purpose of this study is to create a raspberry pi-based temperature, pressure and pH level monitoring in a compact sized digester based from pig manure and organic wastes. The outputs of pig manure and a mixture of pig manure and organic materials separately in a compact-sized biogas digester were compared. This project will only use a compact size or small-scale biodigester. The study was conducted by first calibrating the sensors in 100:0 ratio test of pig manure to organic wastes. The procedure was then followed by gathering the measured data from an LCD display in which the parameters were given by the monitoring system. The significance of the test was the temperature condition of the slurry. For all ratios, the temperatures measured are all in a mesophilic condition. This condition ranges from 20 to 45 centigrade. This is the condition where methanogenesis occurs. Based from the data and the presence of biogas, the best ratio of pig manure to organic materials for the first set is 75:25 and 85:15 for the second.