Chae Soryong, Murugesan Brindha, Kim Hyunsik, Duvvuru Dilip Kumar, Lee Tae, Choi Yang-Hun, Baek Mi-Hwa, Nadagouda Mallikarjuna N
Department of Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, Ohio 45221, United States.
Department of Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, Ohio 45221, United States; U.S. Environmental Protection Agency, ORD, CESER, WID, CMTB, Cincinnati, Ohio 45268, United States.
ACS ES T Water. 2021 Jul 13;1(8). doi: 10.1021/acsestwater.0c00300.
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 (MgCO)-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 MgCO column decreased from 10 L/d to 2.5 L/d, the phosphorus recovery rate of the MgCO-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 MgCO column. The anoxic/aerobic MBR introduction provided efficient removal of TSS, organic matter, and ammonia nitrogen before the MgCO column. The combination of MBR with the MgCO column achieved 73.1% phosphorus recovery from municipal wastewater without physical clogging. The P recovery capacity of the MgCO-based pellets was maintained at 0.47 mg ortho-P/g MgCO-based pellet during the continuous operation. Physical and chemical properties of MgCO-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.
从城市废水中有效回收磷可能是保护水生环境免受富营养化影响并节约天然磷资源的最佳实际选择之一。本文重点验证基于碳酸镁（MgCO）的颗粒与实验室规模的缺氧/好氧膜生物反应器（MBR）系统相结合，用于从城市废水中深度回收磷。随着进入MgCO柱的废水流量从10 L/d降至2.5 L/d，基于MgCO的颗粒的磷回收率从54.3%提高到93.5%。然而，由于通过MgCO柱对总悬浮固体（TSS）的高去除率（约82%），在运行13天后发现该柱严重堵塞。引入缺氧/好氧MBR在MgCO柱之前有效去除了TSS、有机物和氨氮。MBR与MgCO柱的组合实现了从城市废水中73.1%的磷回收率，且无物理堵塞。在连续运行期间，基于MgCO的颗粒的磷回收能力维持在0.47 mg正磷酸盐/克基于MgCO的颗粒。使用带有能量色散X射线光谱（EDX）的扫描电子显微镜（SEM）、X射线衍射（XRD）和布鲁诺尔-埃米特-泰勒（BET）表面积分析仪对实验前后基于MgCO的颗粒的物理和化学性质进行了表征。
