Co-Digestion of Cow Manure and Crude Glycerin

Abstract

In this study,effective use of crude glycerin was investigated. Method included the mixing of crude glycerin with dairy waste in various percentages aiming to establish the best percentage of crude glycerin that should be mixed with dairy waste, for efficient fermentation. The mixture produced high biogas volume on fermentation which apparently indicated a high methane concentration in the biogas produced. When dairy waste was mixed with 4-6% of crude glycerin, the highest volume of methane generation could be observed. It was four times of the gas produced from dairy waste fermentation without incorporation of glycerin. From these results, it is evident that crude glycerin, which can be recycled, could be effectively used in thermophilic methane fermentation.