Anaerobic Co-Digestion of Food Waste and Cow Dung in a Pilot Fixed-Dome Bio-digester for Biogas Production

Year 2022, Volume: 6 Issue: 3, 56 - 64, 30.09.2022

Peter Akhator , Bashir Musa

Abstract

This study investigated the anaerobic co-digestion of cow dung and food waste for biogas the production. A fixed-dome biogas digester was constructed using a modified Gobar digester design. The developed digester has a capacity of 6m3 with a retention time of 40 days. The entire biogas plant was constructed using reinforced concrete. The digester was charged with 100 kg blend of cow dung (CD) and food waste (FW) daily, mix with water in a ratio of 1:1:2 and the produced biogas ws collected using a 5m3 gasbag. Biogas production commenced after the 7th day of charging the digester with substrate. Performance test was done on the produced biogas to determine its composition and burnability. The percentage composition of produced biogas revealed a methane (CH4) content of 59.689%, carbon dioxide (CO2) content of 32.734% and nitrogen (N2) content of 7.547%. The biogas burnt with a stable blue flame during the burn test. The biogas was deployed for cooking purposes using a cook stove in a staff food restaurant. This study is relevant for the implementation of Sustainable Development Goals (SDGs) and strengthening of the bio-based economy with regards to energy security and solid waste management. This can promote environmental and socio-economic sustainability and contribute to reducing carbon footprint of solid waste accumulation.

Keywords

Anaerobic co-digestion, Biogas, Digester, Municipal solid waste, Waste management.

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