Abstract
In order to explore the co-digestion performance of food waste (FW) and spent mushroom substrate (SMS) under high temperature anaerobic conditions, the effects of FW and SMS co-digestion at different mixing ratios on methane production were investigated. Results shown that the co-digestion of FW and SMS had a positive synergistic effect [synergy index (SI) = 106.87–131.09% > 100%], and when the mixing ratio of FW/SMS (volatile solid basis) was 7:3, the methane production of the co-digestion system increased by 15.92% and 69% compared with the single fermentation of FW and SMS, respectively. Simulation results of first-order kinetic model and modified Gompertz model shown that the co-digestion of FW and SMS exhibited the highest hydrolysis rate constant (0.102 day-1) and shortest lag-phase time (4.90 days). Experimental results also demonstrate that co-digestion had lower total/free ammonia nitrogen, suitable pH and alkalinity value, and faster system stability compared with single fermentation. Therefore, co-digestion of FW and SMS to produce methane has certain technical feasibility.
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References
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Acknowledgements
The support from Sino-US-Japan Joint Laboratory on Organic Solid Waste Resource and Energy Technology of USTB is appreciated. The authors gratefully acknowledge support for this study from the National Environmental and Energy Base for International Science & Technology Cooperation.
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This research was financially supported by the National Key R&D Program of China (Grant Nos. 2018YFC1900903, 2018YFC1900904).
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XW and WG contributed to drafting the manuscript, planning, and performing the experiments. XM and SZ contributed to analyzing the data. QW contributed to reviewing and revising the manuscript. CW contributed to supervision and editing.
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Wang, X., Guan, W., Ma, X. et al. Enhancement of Food Waste Thermophilic Anaerobic Digestion with Supplementing Spent Mushroom Substrate: Synergistic Effect and Stability. Waste Biomass Valor 13, 2881–2888 (2022). https://doi.org/10.1007/s12649-022-01702-3
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DOI: https://doi.org/10.1007/s12649-022-01702-3