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<p>The challenge of inadequate carbon sources in wastewater effluent, known as tailwater, with a low carbon-to-nitrogen (C/N) ratio has garnered increasing attention due to its impact on the effectiveness of advanced treatment processes, particularly in nitrogen removal. This study is the first to investigate the use of electricity generated by CW‑MFCs to power constructed wetland microbial electrolysis cells (CW‑MECs), with the aim of enhancing pollutant removal from tailwater with a low carbon-to-nitrogen (C/N) ratio. The results indicate that a low C/N ratio in the tailwater hinders additional pollutant removal, particularly impacting the denitrification process. Introducing an external voltage in the CW-MEC enhanced the removal of chemical oxygen demand (COD) and total phosphorus (TP), with the anode region of the CW-MEC system being pivotal in COD and TP elimination. Furthermore, the applied voltage facilitates the conversion and elimination of NH₄⁺-N at the cathode through electrochemical reduction and hydrogen autotrophic denitrification, with optimal denitrification achieved at 2.0&#xa0;V. When powered by series-connected CW-MFCs with an output voltage ranging from 1741 to 1914&#xa0;mV, the CW-MEC achieved removal rates of 89.20 ± 1.80% for COD, 61.03 ± 0.60% for NH₄⁺-N, 94.82 ± 1.87% for NO₃⁻-N, and 83.60 ± 3.35% for TP in low C/N ratio tailwater. These findings indicate that the novel CW-MFC-powered CW-MEC system has the potential to achieve energy self-sufficiency during advanced treatment processes, thereby eliminating the need for external energy input and demonstrating strong potential for engineering applications.</p>

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Tailwater Treatment Using a Novel Coupled System of Microbial Electrolysis Cells Powered by Constructed Wetland-Microbial Fuel Cells

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Jinhui Zhao,
  • Lei Liu,
  • Qingquan Liu,
  • Tong Wu,
  • Yanxia Wang,
  • Jing Rui

摘要

The challenge of inadequate carbon sources in wastewater effluent, known as tailwater, with a low carbon-to-nitrogen (C/N) ratio has garnered increasing attention due to its impact on the effectiveness of advanced treatment processes, particularly in nitrogen removal. This study is the first to investigate the use of electricity generated by CW‑MFCs to power constructed wetland microbial electrolysis cells (CW‑MECs), with the aim of enhancing pollutant removal from tailwater with a low carbon-to-nitrogen (C/N) ratio. The results indicate that a low C/N ratio in the tailwater hinders additional pollutant removal, particularly impacting the denitrification process. Introducing an external voltage in the CW-MEC enhanced the removal of chemical oxygen demand (COD) and total phosphorus (TP), with the anode region of the CW-MEC system being pivotal in COD and TP elimination. Furthermore, the applied voltage facilitates the conversion and elimination of NH₄⁺-N at the cathode through electrochemical reduction and hydrogen autotrophic denitrification, with optimal denitrification achieved at 2.0 V. When powered by series-connected CW-MFCs with an output voltage ranging from 1741 to 1914 mV, the CW-MEC achieved removal rates of 89.20 ± 1.80% for COD, 61.03 ± 0.60% for NH₄⁺-N, 94.82 ± 1.87% for NO₃⁻-N, and 83.60 ± 3.35% for TP in low C/N ratio tailwater. These findings indicate that the novel CW-MFC-powered CW-MEC system has the potential to achieve energy self-sufficiency during advanced treatment processes, thereby eliminating the need for external energy input and demonstrating strong potential for engineering applications.