Abstract
This study investigated the effects of trace elements (TEs: Fe, Co, and Ni) on the anaerobic digestion of food waste in laboratory scale semi-continuously fed anaerobic digesters. The digesters were operated for approximately 460d at organic loading rates (OLRs) ranging from 1.0 to 5.0gVSL−1d−1 at 37°C. Results showed that methane production was severely inhibited when volatile fatty acids (VFAs) concentration was 30000mgL−1 at OLR of 4.0gVSL−1d−1 without the addition of TEs. However, the inhibition was gradually decreased and the methane production increased from 0.13 up to 0.44Lg−1VSadded when the TEs was added. Fe was proved to be the essential element in maintaining the stability of the digester. The conversion coefficient of substrate into biogas (YS/G) was 1.00 and 1.26gVSremovedL−1 biogas with and without TEs addition, respectively. The estimated biomass yield with feeding TEs (0.06gVSSg−1CODremoved) was higher three times than that without TEs (0.02gVSSg−1CODremoved).
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