MOE Key Laboratory of Pollution Processes and Environmental Criteria / Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China.
MOE Key Laboratory of Pollution Processes and Environmental Criteria / Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China.
Water Res. 2024 Nov 1;265:122225. doi: 10.1016/j.watres.2024.122225. Epub 2024 Aug 6.
Concerns regarding membrane fouling and suboptimal bioenergy recovery have constrained the implementation of anaerobic membrane bioreactor (AnMBR) for treating low-strength municipal wastewater. This study presents a novel anaerobic cathodic dynamic membrane bioreactor (AnCDMBR) designed to address these challenges. A self-formed cathodic dynamic membrane (CDM) on inexpensive carbon cloth was developed to function as both a membrane and biocathode to achieve dual-function effects of mitigating membrane fouling and accelerating organics conversion. Compared with common dynamic membrane (1.52 kPa/d) and commercial membranes (7.52 kPa/d), the developed CDM presented a significantly reduced fouling rate (1.02 kPa/d), exhibiting the potential as a substitute for high-cost conductive membranes. Furthermore, efficient and stable biomethanation occurred in AnCDMBR with a superior methane yield rate of 0.26 L-CH/g-COD (CH content > 95 %), which was 1.42 times higher than the control, linked to the higher activities of microbial metabolism and methanogenic-related key enzymes. Further analysis revealed that electrostimulation-induced niche differentiation of microbiota regulated interspecies interactions between electroactive microorganisms and complex anaerobic digestion microbiomes, facilitating organic matter conversion to methane and leading to superior bioenergy recovery. This study offered a new strategy for effectively mitigating fouling and recovering bioenergy from low-strength wastewater, potentially expanding the application of AnMBRs.
针对膜污染和生物能源回收效果不佳的问题，限制了厌氧膜生物反应器（AnMBR）在处理低浓度市政污水中的应用。本研究提出了一种新型的厌氧阴极动态膜生物反应器（AnCDMBR），旨在解决这些挑战。在廉价的碳纤维布上开发了自形成的阴极动态膜（CDM），用作膜和生物阴极，实现了缓解膜污染和加速有机物转化的双重功能。与普通动态膜（1.52 kPa/d）和商业膜（7.52 kPa/d）相比，所开发的 CDM 具有显著降低的污染速率（1.02 kPa/d），具有替代高成本导电膜的潜力。此外，AnCDMBR 中发生了高效且稳定的生物甲烷化作用，甲烷产率达到 0.26 L-CH/g-COD（CH 含量>95%），比对照提高了 1.42 倍，这与微生物代谢和产甲烷相关关键酶的更高活性有关。进一步分析表明，电刺激诱导的微生物群落生态位分化调节了电活性微生物与复杂厌氧消化微生物群落之间的种间相互作用，促进了有机物向甲烷的转化，从而实现了更好的生物能源回收。本研究为有效缓解低浓度废水的膜污染和回收生物能源提供了新策略，可能会扩大 AnMBR 的应用范围。
