期刊
WASTE AND BIOMASS VALORIZATION
卷 13, 期 6, 页码 2881-2888出版社
SPRINGER
DOI: 10.1007/s12649-022-01702-3
关键词
Anaerobic fermentation; Co-digestion; Food waste; Methane; Spent mushroom substrate
资金
- National Key R&D Program of China [2018YFC1900903, 2018YFC1900904]
The co-digestion of food waste and spent mushroom substrate under high temperature anaerobic conditions showed a positive synergistic effect on methane production, with the best results observed at a mixing ratio of 7:3. The co-digestion system exhibited higher hydrolysis rate constant and system stability compared to single fermentation.
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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