Cheng Hui, Gu Kaiyi, Li Yemei, Guo Guangze, Chang Chang-Tang, Guo Wenshan, Li Yu-You
School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai, 200444, China.
School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai, 200444, China.
J Environ Manage. 2025 Sep;392:126652. doi: 10.1016/j.jenvman.2025.126652. Epub 2025 Aug 2.
This study extends the previous research focused on enhancing the sustainable flux of a high-solid anaerobic membrane bioreactor (AnMBR) for the food waste (FW) and sewage sludge (SeS) co-digestion. A control strategy was implemented by adjusting instantaneous flux and filtration-to-relaxation (F/R) ratio under different total solid (TS) concentrations. The maximum sustainable fluxes of 8.7 ± 0.1, 13.3 ± 0.2, 20.3 ± 0.2, and 20.3 ± 0.6 LMH were achieved at the TS concentrations of 30, 25, 20, and 15 g/L, respectively, with corresponding optimal F/R ratios of 3:1, 5:1, 9:1, and 9:1, respectively. These sustainable fluxes were significantly improved, 4.24, 3.33, 2.18, and 2.01 times of those observed in the mono FW digestion at the same TS concentrations. Furthermore, a mathematical simulation in the form of an exponential function was developed to forecast the optimal sustainable flux at other TS levels. The improved sustainable flux of FW and SeS co-digestion than mono FW digestion might due to (1) the lower apparent viscosity, (2) the larger particle size, and (3) the synergistic effect existed in this co-digestion system. Based on the control strategy of membrane filtration, a TS concentration of 20 g/L is recommended for the AnMBR in the anaerobic co-digestion of FW and SeS. This research provides a valuable guidance for optimizing working mode of high-solid AnMBRs.
本研究扩展了先前的研究，该研究聚焦于提高用于食物垃圾（FW）和污水污泥（SeS）共消化的高固体厌氧膜生物反应器（AnMBR）的可持续通量。通过在不同总固体（TS）浓度下调整瞬时通量和过滤与松弛（F/R）比来实施控制策略。在TS浓度分别为30、25、20和15 g/L时，实现的最大可持续通量分别为8.7±0.1、13.3±0.2、20.3±0.2和20.3±0.6 LMH，相应的最佳F/R比分别为3:1、5:1、9:1和9:1。这些可持续通量显著提高，是在相同TS浓度下单一FW消化中观察到的通量的4.24、3.33、2.18和2.01倍。此外，还开发了指数函数形式的数学模拟来预测其他TS水平下的最佳可持续通量。FW和SeS共消化的可持续通量比单一FW消化有所提高，这可能是由于（1）表观粘度较低，（2）粒径较大，以及（3）该共消化系统中存在协同效应。基于膜过滤的控制策略，建议在FW和SeS的厌氧共消化中，AnMBR的TS浓度为20 g/L。本研究为优化高固体AnMBR的工作模式提供了有价值的指导。
