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Microbial community acclimatization for enhancement in the methane productivity of anaerobic co-digestion of fats, oil, and grease
October 2019
October 2019
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Abstract
<p class="first" id="d12838051e107">The methane productivity and long chain fatty
acids (LCFAs) degradation capability
of unacclimatized seed sludge (USS) and acclimatized seed sludge (ASS) at different
substrate ratios of fats oil and grease (FOG) and mixed sewage sludge were investigated
in this study. Biogas produced in ASS in initial phase of anaerobic digestion had
higher methane content (65-76%) than that in USS (26-73%). The degradation of major
LCFAs in the ASS was 22-80%, 33-191%, and 7-64% higher for the substrate ratios of
100:10, 100:20, and 100:30, respectively, as compared to the LCFAs' degradation in
USS. Microbial acclimatization increased the population of Firmicutes (40%), Bacteroidetes
(32%), Synergistetes (10%), and Euryarchaeota (8%) in ASS, which supported the faster
rate of LCFAs degradation for its later conversion to methane. The significant abundance
of Syntrophomonas and Methanosarcina genera in ASS supported faster generation rate
of methane in an obligatory syntrophic relationship.
</p>