Journal
WASTE MANAGEMENT
Volume 78, Issue -, Pages 509-520Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2018.06.017
Keywords
Anaerobic digestion; Food waste; Microbial community structure; Two-phase system; Uncontrolled pH operation
Categories
Funding
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) through Human Resources Program in Energy Technology - Ministry of Trade, Industry and Energy, Republic of Korea [20164030201010]
- Basic Science Research Program through National Research Foundation of Korea (NRF) - Ministry of Education, Republic of Korea [2017R1D1A1B03035489]
- National Research Foundation of Korea [2017R1D1A1B03035489] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study compared single- versus two-phase systems for semi-continuous anaerobic digestion of food waste without pH control at varying organic loading rates (OLRs). The methanogenic reactors of both systems required trace element supplementation for stable operation at 3.0 g VS (volatile solids)/L.d or higher OLRs. Under trace-element supplemented conditions, both systems achieved stable and efficient performance at OLRs up to 4.0 g VS/L.d. The two-phase system outperformed the single-phase system at 1.0-4.0 g VS/L.d OLRs, but it failed at an OLR of 5.0 g VS/L.d. Meanwhile, the single-phase system maintained the stable performance and reached its maximum methane production at this OLR. These results suggest that a single-phase configuration is more advantageous for robust treatment of food waste without pH control at high organic and hydraulic loads. Hydrogenotrophic methanogens dominated the methanogen community throughout the experiment in both systems. Microbial community structure shifts correlated with reactor operation and performance characteristics. (C) 2018 Elsevier Ltd. All rights reserved.
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