A 10m3 Avenam biogas system built in Lagos, Nigeria to treat cow dung, the biogas produced is used as cooking gas, while the solids in the slurry is separated dried and used for solid organic fertilizer production, for farming purpose. It is composed of 1 number of 10m3 biogas plant and 5m3 biogas storage bags, 1 set of 5KW biogas generator.