Unlocking synergy in thermophilic co-digestion of rice straw and food waste: boosting biogas production through accelerated kinetics and substrate biodegradability

作者：Yaqian Liu, Ryoya Watanabe, Qian Li, Yutong Luo, Naohito Tsuzuki, Yu Qin, Rong Chen, Yu-You Li · 发表于：Journal of Environmental Management · 年份：2025 · DOI：10.1016/j.jenvman.2025.127700 · 被引用次数：3 · 研究领域：Anaerobic Digestion and Biogas Production、Biofuel production and bioconversion、Microbial Metabolic Engineering and Bioproduction

This study investigated the mesophilic and thermophilic anaerobic digestion (AD) systems of rice straw (RS) (40 %–100 %) and food waste, comparing biogas production performance, organic matter degradation characteristics, and energy balance assessment. Results showed that thermophilic conditions exhibited excellent hydrolysis kinetics, and especially at 100 % RS ratio, with significantly higher biogas production rate and methane yield (154.1 vs. 94.5 mL/g total solids). However, both temperature regimes maintained biogas production stability, which may be attributed to the supply of non-ammonia alkalinity. Furthermore, energy balance assessment revealed that mesophilic conditions had higher energy recovery potential at 40 % RS ratio, while thermophilic systems achieved superior net energy output at higher RS ratio, as increased methane production offset additional heating requirements. This study reveals the key influence of temperature conditions on AD technology for lignocellulosic waste, providing a technical foundation for sustainable green agricultural development. • Co-digestion of rice straw and food waste was evaluated under 35 °C and 55 °C. • Revealed non-ammonia alkalinity as key potential buffer in straw mono-digestion. • Demonstrated lignocellulose degradation kinetics shift across RS ratios. • Identified temperature-dependent divergence in AD reaction rate patterns. • Established energy trade-off framework linking temperature with RS content.