Tang Xifang, You Shaowen, Jiao Chengfan, Li Qian, Li Yu-You, Chen Rong
Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an 710055, PR China.
Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an 710055, PR China; International S & T Cooperation Center for Urban Alternative Water Resources Development, Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an 710055, PR China.
Bioresour Technol. 2025 Nov;435:132872. doi: 10.1016/j.biortech.2025.132872. Epub 2025 Jun 22.
Anaerobic membrane bioreactors (AnMBRs) incorporating biochar (BC) offer a promising solution for food waste (FW) treatment; however, further BC dosage optimization is needed. This study assessed the effects of BC on AnMBR performance through experiments with multiple BC dosages (0-20 g/L), computational fluid dynamics (CFD) simulations, and microbial analysis comparing the optimal dose (10 g/L) with the control group. Optimal BC addition at 10 g/L increased methane production, maintained chemical oxygen demand (COD) removal at > 98 %, and reduced transmembrane pressure by 53.6 %. CFD modeling revealed enhanced turbulence at this dosage (peak dynamic pressure 0.43 kPa), promoting foulant scouring while inhibiting extracellular polymeric substance (EPS) adhesion. Microbial profiling revealed that BC enriched Chloroflexi and Methanosaeta populations, promoting direct interspecies electron transfer (DIET) and upregulating genes associated with acetoclastic methanogenesis. Excessive BC (≥15 g/L) worsened fouling due to particle deposition. The findings suggest a BC dosage strategy to balance efficiency and fouling mitigation in AnMBR-based FW treatment systems.
结合生物炭（BC）的厌氧膜生物反应器（AnMBR）为食物垃圾（FW）处理提供了一个有前景的解决方案；然而，还需要进一步优化生物炭的投加量。本研究通过多种生物炭投加量（0 - 20 g/L）的实验、计算流体动力学（CFD）模拟以及将最佳剂量（10 g/L）与对照组进行比较的微生物分析，评估了生物炭对AnMBR性能的影响。添加10 g/L的最佳生物炭量可提高甲烷产量，将化学需氧量（COD）去除率维持在>98%，并使跨膜压力降低53.6%。CFD建模显示，在此剂量下湍流增强（峰值动压0.43 kPa），促进了污垢冲刷，同时抑制了胞外聚合物（EPS）的附着。微生物分析表明，生物炭使绿弯菌属和甲烷八叠球菌属种群富集，促进了种间直接电子转移（DIET），并上调了与乙酸裂解产甲烷相关的基因。过量的生物炭（≥15 g/L）由于颗粒沉积而加剧了污染。研究结果表明了一种生物炭投加量策略，以平衡基于AnMBR的食物垃圾处理系统的效率和污染缓解。
