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Electrolysis-enhanced ecological floating bed and its factors influencing nitrogen and phosphorus removal in simulated hyper-eutrophic water

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Abstract

To enhance ammonia nitrogen (NH3-N) and phosphate (PO43−-P) removal in hyper-eutrophic water, electrolysis-enhanced ecological floating bed (EEEFB) was designed with a Mg–Al alloy anode, a Ir–Ta–Ti metal oxide-coated titanium anode, and an Fe anode with the same graphite cathode. The results showed that the Mg–Al alloy anode with graphite cathode had a better ability to enhance NH3-N and PO43−-P removal. When the current density was 0.37 mA·cm−2, the electrolysis time was 24 h/d, and the net removal rates of NH3-N and PO43−-P were 62% and 99.4%, respectively. In winter, the purification efficiencies of NH3-N and PO43−-P were as high as 7388.4 mg·m−2 and 4297.5 mg·m−2, respectively, by EEEFBs which were significantly higher than the traditional ecological floating bed (p < 0.05). Scanning electron microscopy (SEM) and X-ray spectrometry confirmed that the PO43−-P was deposited in the sediment of EEEFBs with Mg–Al alloy anode and Fe anode.

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Data availability

The datasets used and/or analyzed during the current study are available from the corresponding author. All data generated or analyzed during this study are included in this published article [and its supplementary information files].

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Funding

Funding was provided by the National Natural Science Foundation of China (51908277), the Natural Science Foundation of Jiangsu Province (BK20190320), and the China National Critical Project for Science and Technology on Water Pollution Prevention and Control (2017ZX07204002).

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Authors and Affiliations

  1. State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, People’s Republic of China

    Cheng Yan, Tangming Ma, Mingxuan Wang, Shunqing Yang, Liuyan Yang & Yan Gao

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  1. Cheng Yan
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  2. Tangming Ma
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  3. Mingxuan Wang
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  4. Shunqing Yang
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  5. Liuyan Yang
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  6. Yan Gao
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Contributions

Cheng Yan, Yan Gao, and Mingxuan Wang performed the electrolysis ecological floating bed design, and experiment setup and tested the water qualities. Yan Gao, Tangming Ma, and Shunqing Yang wrote the manuscript; Liuyan Yang directed the experiment and writing of the paper. All authors read and approved the final manuscript.

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Correspondence to Yan Gao.

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Yan, C., Ma, T., Wang, M. et al. Electrolysis-enhanced ecological floating bed and its factors influencing nitrogen and phosphorus removal in simulated hyper-eutrophic water. Environ Sci Pollut Res 28, 22832–22842 (2021). https://doi.org/10.1007/s11356-020-12261-2

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