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.
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: No. 51678471, No. 51978556
Funding source: Shaanxi Science Fund for Distinguished Young Scholars
Award Identifier / Grant number: No.2019JC-31
Funding source: The Key Research and Development Program in Shaanxi Province
Award Identifier / Grant number: 2018ZDXM-SF-029
Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: This research work was partly supported by the National Natural Science Foundation of China (NSFC) (No.51678471, No.51978556), Shaanxi Science Fund for Distinguished Young Scholars (No.2019JC-31) and The Key Research and Development Program in Shaanxi Province (2018ZDXM-SF-029).
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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