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<p>Constructed Wetland (CW) is a low-carbon, sustainable ecological treatment technology widely used for deep treatment of wastewater treatment plant tailwater. However, constrained by the lack of available carbon source in the tailwater, the traditional CWs often face the problem of low removal efficiency of total nitrogen (TN) in the treatment process, accompanied by the release of greenhouse gases (N<sub>2</sub>O, CO<sub>2</sub> and CH<sub>4</sub>). The removal effects of typical nitrogen pollutants NH<sub>4</sub><sup>+</sup>-N, NO<sub>3</sub><sup>−</sup>-N and TN (influent composition: C/<i>N</i> ≈ 0.5, TN = 14.14 ± 0.07&#xa0;mg/L, NO<sub>3</sub><sup>−</sup>-<i>N</i> = 8.68 ± 0.88&#xa0;mg/L, and NH<sub>4</sub><sup>+</sup>-<i>N</i> = 5.45 ± 0.93&#xa0;mg/L), as well as the degree of GHG emissions in the CW were compared under different volume ratios of biochar and pyrite. By studying the key enzyme activities of microorganisms in CW system and the ionic changes within the substrate, the mechanism of the influence of CW with different Fe-C substrate ratios on the process of deep denitrification of tailwater was preliminarily analyzed. The results showed that the most efficient nitrogen removal of this study was achieved in 50% pyrite and 30% biochar CW (P5B3), in which NO<sub>3</sub><sup>−</sup>-N removal increased from 42.7 ± 0.2% to 59.7 ± 0.8% and TN from 48.5 ± 0.5% to 57.4 ± 1.1% compared to the control. Nevertheless, Fe-C-based CWs did not reduce the GWP compared to the contr. This study showed that Fe-C-based CW can improve the nitrogen removal efficiency of municipal tailwater without promoting GWP. It is helpful to further promote the popularization and application of Fe-C-based CW.</p>

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Evaluating the Efficiency of Fe-C-Based Constructed Wetlands for Municipal Tailwater Treatment and Greenhouse Gas Emissions

  • 期刊论文

  • 发表日期：

    2025年11月20日

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  • Songqi Liu,
  • Xinyu Song,
  • Dapeng Li ,
  • Jingqiu Sun,
  • Sujie Shan,
  • Yao Xu

摘要

Constructed Wetland (CW) is a low-carbon, sustainable ecological treatment technology widely used for deep treatment of wastewater treatment plant tailwater. However, constrained by the lack of available carbon source in the tailwater, the traditional CWs often face the problem of low removal efficiency of total nitrogen (TN) in the treatment process, accompanied by the release of greenhouse gases (N2O, CO2 and CH4). The removal effects of typical nitrogen pollutants NH4+-N, NO3−-N and TN (influent composition: C/N ≈ 0.5, TN = 14.14 ± 0.07 mg/L, NO3−-N = 8.68 ± 0.88 mg/L, and NH4+-N = 5.45 ± 0.93 mg/L), as well as the degree of GHG emissions in the CW were compared under different volume ratios of biochar and pyrite. By studying the key enzyme activities of microorganisms in CW system and the ionic changes within the substrate, the mechanism of the influence of CW with different Fe-C substrate ratios on the process of deep denitrification of tailwater was preliminarily analyzed. The results showed that the most efficient nitrogen removal of this study was achieved in 50% pyrite and 30% biochar CW (P5B3), in which NO3−-N removal increased from 42.7 ± 0.2% to 59.7 ± 0.8% and TN from 48.5 ± 0.5% to 57.4 ± 1.1% compared to the control. Nevertheless, Fe-C-based CWs did not reduce the GWP compared to the contr. This study showed that Fe-C-based CW can improve the nitrogen removal efficiency of municipal tailwater without promoting GWP. It is helpful to further promote the popularization and application of Fe-C-based CW.