Effective recovery of phosphorus from municipal wastewater could be one of the best practical alternatives to protect aquatic environments from eutrophication and save natural phosphorus resources. This paper focuses on validating magnesium carbonate (MgCO₃)-based pellets combined with a bench-scale anoxic/aerobic membrane bioreactor (MBR) system for advanced phosphorus recovery from municipal wastewater. As the flow rate of wastewater into the MgCO₃ column decreased from 10 L/d to 2.5 L/d, the phosphorus recovery rate of the MgCO₃-based pellets increased from 54.3 to 93.5%. However, the column’s severe clogging was found after a 13-days operation due to the high removal of total suspended solids (TSS) (∼82%) through the MgCO₃ column. The anoxic/aerobic MBR introduction provided efficient removal of TSS, organic matter, and ammonia nitrogen before the MgCO₃ column. The combination of MBR with the MgCO₃ column achieved 73.1% phosphorus recovery from municipal wastewater without physical clogging. The P recovery capacity of the MgCO₃-based pellets was maintained at 0.47 mg ortho-P/g MgCO₃-based pellet during the continuous operation. Physical and chemical properties of MgCO₃-based pellets before and after the experiment were characterized using scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and Brunauer–Emmett–Teller (BET) surface area analyzer.

中文翻译：

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使用缺氧/好氧膜生物反应器和碳酸镁基颗粒从城市废水中进行先进的磷回收

从城市废水中有效回收磷可能是保护水环境免受富营养化和节约天然磷资源的最佳实用替代方案之一。本文重点验证基于碳酸镁 (MgCO ₃ ) 的颗粒与小型缺氧/好氧膜生物反应器 (MBR) 系统相结合，以从城市废水中进行先进的磷回收。_{随着进入 MgCO 3}塔的废水流量从 10 L/d 降低到 2.5 L/d，MgCO ₃基球团的磷回收率从 54.3% 提高到 93.5%。_{然而，由于通过 MgCO 3}对总悬浮固体 (TSS) (~82%) 的高去除率，在运行 13 天后发现色谱柱严重堵塞柱子。_{引入缺氧/好氧 MBR 可在 MgCO 3}柱之前有效去除 TSS、有机物和氨氮。MBR 与 MgCO ₃柱的组合实现了城市废水中 73.1% 的磷回收率，而没有物理堵塞。在连续操作过程中，基于MgCO ₃的球团的P回收能力保持在0.47mg ortho-P/g MgCO _{3基球团。}使用扫描电子显微镜 (SEM) 结合能量色散 X 射线光谱 (EDX)、X 射线衍射 (XRD) 和 Brunauer-Emmett-Teller 对实验前后MgCO ₃基球团的物理和化学性质进行了表征(BET) 表面积分析仪。