The practicality of intensifying organic matter capture for bioenergy recovery to achieve energy-neutral municipal wastewater treatment is hindered by the lack of sustainable methods. This study developed innovative processes integrating iron recycle-driven organic capture with a sidestream anaerobic membrane bioreactor (AnMBR). Iron-assisted chemically enhanced primary treatment achieved elemental redirection with 75.2% of chemical oxygen demand (COD), 20.2% of nitrogen, and 97.4% of phosphorus captured into the sidestream process as iron-enhanced primary sludge (Fe-PS). A stable and efficient biomethanation of Fe-PS was obtained in AnMBR with a high methane yield of 224 mL/g COD. Consequently, 64.1% of the COD in Fe-PS and 48.2% of the COD in municipal wastewater were converted into bioenergy. The acidification of anaerobically digested sludge at pH = 2 achieved a high iron release efficiency of 96.1% and a sludge reduction of 29.3% in total suspended solids. Ultimately, 87.4% of iron was recycled for coagulant reuse, resulting in a theoretical 70% reduction in chemical costs. The novel system evaluation exhibited a 75.2% improvement in bioenergy recovery and an 83.3% enhancement in net energy compared to the conventional system (primary sedimentation and anaerobic digestion). This self-reliant and novel process can be applied in municipal wastewater treatment to advance energy neutrality at a lower cost.

中文翻译：

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铁回收驱动的有机捕获和侧流厌氧膜生物反应器彻底改变城市废水处理中的生物能源发电


由于缺乏可持续的方法，强化有机物捕获以进行生物能源回收以实现能源中性的城市废水处理的实用性受到阻碍。这项研究开发了将铁回收驱动的有机捕获与侧流厌氧膜生物反应器（AnMBR）相结合的创新工艺。铁辅助化学强化初级处理实现了元素重定向，75.2% 的化学需氧量 (COD)、20.2% 的氮和 97.4% 的磷作为铁强化初级污泥 (Fe-PS) 捕获到侧流工艺中。在 AnMBR 中实现了稳定高效的 Fe-PS 生物甲烷化，甲烷产量高达 224 mL/g COD。因此，Fe-PS 中 64.1% 的 COD 和城市废水中 48.2% 的 COD 转化为生物能源。 pH = 2 时厌氧消化污泥的酸化实现了 96.1% 的高铁释放效率，污泥总悬浮固体减少了 29.3%。最终，87.4% 的铁被回收用于混凝剂的再利用，理论上化学品成本降低了 70%。与传统系统（初级沉淀和厌氧消化）相比，新型系统评估显示生物能回收率提高了 75.2%，净能提高了 83.3%。这种自力更生的新颖工艺可应用于城市废水处理，以较低的成本推进能源中和。