Manure is one of the most common substrates for biogas production. Manure from dairy- and swine animals
are often considered to stabilize the biogas process by contributing nutrients and trace elements
needed for the biogas process. In this study two lab-scale reactors were used to evaluate the effects of
trace element addition during co-digestion of manure from swine- and dairy animals with industrial
waste. The substrate used contained high background concentrations of both cobalt and nickel, which
are considered to be the most important trace elements. In the reactor receiving additional trace elements,
the volatile fatty acids (VFA) concentration was 89% lower than in the control reactor. The lower
VFA concentration contributed to a more digested digestate, and thus lower methane emissions in the
subsequent storage. Also, the biogas production rate increased with 24% and the biogas production yield
with 10%, both as a result of the additional trace elements at high organic loading rates. All in all, even
though 50% of the feedstock consisted of manure, trace element addition resulted in multiple positive
effects and a more reliable process with stable and high yield
Manure is one of the most common substrates for biogas production. Manure from dairy- and swine animalsare often considered to stabilize the biogas process by contributing nutrients and trace elementsneeded for the biogas process. In this study two lab-scale reactors were used to evaluate the effects oftrace element addition during co-digestion of manure from swine- and dairy animals with industrialwaste. The substrate used contained high background concentrations of both cobalt and nickel, whichare considered to be the most important trace elements. In the reactor receiving additional trace elements,the volatile fatty acids (VFA) concentration was 89% lower than in the control reactor. The lowerVFA concentration contributed to a more digested digestate, and thus lower methane emissions in thesubsequent storage. Also, the biogas production rate increased with 24% and the biogas production yieldwith 10%, both as a result of the additional trace elements at high organic loading rates. All in all, eventhough 50% of the feedstock consisted of manure, trace element addition resulted in multiple positiveeffects and a more reliable process with stable and high yield
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