4.7 Article

Mn oxides changed nitrogen removal process in constructed wetlands with a microbial electrolysis cell

Journal

SCIENCE OF THE TOTAL ENVIRONMENT
Volume 770, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.scitotenv.2020.144761

Keywords

Microbial electrolysis cell; Constructed wetlands; Mn redox cycling; Nitrogen removal; Microbial community

Funding

  1. National Natural Science Foundation of China [51978385, 51720105013]
  2. Key Project of Natural Science Foundation of Shandong Province [ZR2018ZC08N4]
  3. Shandong Provincial Key Research and Development Program (Major Scientific and Technological Innovation Project) [2019JZZY010411]
  4. Shandong University Interdisciplinary Research and Innovation Team of Young Scholars [2020QNQT20]

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The study demonstrates that enhanced Mn redox cycling in constructed wetlands can improve nitrogen removal efficiency, and using Mn oxides as the matrix can accelerate the nitrogen removal process.
Intensified Mn redox cycling could enhance nutrient removal in constructed wetlands (CWs). In this study, Mn oxides (birnessite-coated sand) were used as the matrix in horizontal flow CWs (HFCWs) with amicrobial electrolysis cell (MEC) (E-B-CW) or without anMEC (B-CW). The model CWs were developed to investigate the capacities andmechanisms of nitrogen removal with increasedMn redox cycling. The results showed that E-B-CW had the highest average removal efficiencies for NH4-N, NO3-N and TN, followed by B-CW and control HFCW (C-CW). The Mn(III) oxides (MnOOH or Mn2O3) and the Mn(IV) oxide (MnO2) were all detected in E-B-CW and B-CW, while the matrix in E-B-CW had much more Mn(IV) oxides than B-CW. Interestingly, clustering heat map showed that ammonification and nitrate reduction were related to Mn-oxidizing bacteria and the relative abundance of Mn-oxidizing bacteria in E-B-CW was highest due to the re-oxidation of Mn(II) by the MEC. (C) 2021 Elsevier B.V. All rights reserved.

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