Abstract
The objective of this study was to determine the quantity and quality of biogas produced by co-digesting flushed dairy manure (FDM) and turkey processing wastewater (TPW) as part of a broader study by our research group to develop a biomass inventory for the state of Virginia to assess their potential as alternative energy sources. This study is directed at identifying a way to make biogas production tenable in small dairies with less than 150 milking cows. An attached growth digester with 15 L working volume and 3 L head space was operated at a 5 d hydraulic retention time using five feed mixes containing 100, 67, 50, 33, and 0% FDM by volume. The volume of biogas produced from feeds with more than 50% TPW were 2 to 3 times higher than the volume of biogas from feed with less than 50% TPW. The biogas yield increased as the proportion of TPW in the feed increased. The biogas yield for feeds A, B, C, D, and E were 0.072, 0.132, 0.272, 0.42, and 0.8 m3 [kg VS] - 1, respectively. Thus, the study showed that augmenting FDM with TPW increased both the quantity and quality of biogas.
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