Abstract High NO3 − and Ni(II) concentrations in mining wastewater pose a risk to public health. In this study, the NO3 − and Ni(II) removal process was performed using a novel PDA@EDTA@Fe3O4 immobilization carrier. The effects of hydraulic retention time (HRT; 6, 8, and 10 h), along with Fe(II) (10, 15, and 20 mg/L) and Ni(II) (10, 20, and 30 mg/L) influent concentrations on the simultaneous removal of NO3 − and Ni(II) were investigated in immobilized biofilm reactors. Results showed that the highest NO3 − removal efficiency (97.78%) and Ni(II) removal efficiency (91.21%) were obtained in the immobilized biofilm reactor with PDA@EDTA@Fe3O4 under the conditions of 10 h HRT, influent Fe(II) concentrations of 20 mg/L and Ni(II) concentrations of 10 mg/L. High-throughput sequencing results confirmed that Cupriavidus sp.CC1 plays a major role in the functioning of the immobilized reactor. This process provides the potential for effective treatment of NO3 − and Ni(II) polluted water.

中文翻译：

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一种新型聚多巴胺@EDTA@Fe3O4 材料在固定化生物膜反应器中同时高效去除氮和镍的应用

摘要 采矿废水中高浓度的 NO3 - 和 Ni(II) 对公众健康构成威胁。在这项研究中，使用新型 PDA@EDTA@Fe3O4 固定载体进行 NO3 - 和 Ni(II) 去除过程。水力停留时间（HRT；6、8 和 10 小时）以及 Fe(II)（10、15 和 20 mg/L）和 Ni(II)（10、20 和 30 mg/L）的影响) 在固定化生物膜反应器中研究了同时去除 NO3 - 和 Ni(II) 的进水浓度。结果表明，在 PDA@EDTA@Fe3O4 固定化生物膜反应器中，在 HRT 10 h、进水 Fe(II) 条件下，NO3 - 去除效率最高（97.78%）和 Ni（II）去除效率（91.21%） 20 mg/L 的浓度和 10 mg/L 的 Ni(II) 浓度。高通量测序结果证实 Cupriavidus sp. CC1 在固定化反应器的功能中起主要作用。该过程提供了有效处理 NO3 - 和 Ni(II) 污染水的潜力。