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| Effects of low C/N ratio wastewater on nitrogen removal and greenhouse gases emissions in constructed wetlands |
| Received:April 08, 2025 Revised:June 12, 2025 |
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| KeyWord:constructed wetland;C/N;wetland plant;greenhouse gas emission;nitrogen removal efficiency |
| Author Name | Affiliation | E-mail | | LIU Taojuan | College of Resources and Environment, Shanxi Agricultural University, Jinzhong 030801, China
Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | FAN Xinyu | College of Resources and Environment, Shanxi Agricultural University, Jinzhong 030801, China | | | ZHAO Long | Chinese Research Academy of Environmental Sciences, Beijing 100012, China | zhaolong1227@126.com | | LIU Fenwu | College of Resources and Environment, Shanxi Agricultural University, Jinzhong 030801, China | liufenwu@sxau.edu.cn |
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| Abstract: |
| This study aims to investigate the enhancing effect of wetland plants on nitrogen removal in constructed wetlands treating low C/N wastewater, as well as their regulatory role in greenhouse gas emissions, with the goal of optimizing the nitrogen removal performance and greenhouse gas mitigation capacity of constructed wetlands. This study investigated a bench-scale constructed wetland system to evaluate the effects of planting Cyperus alternifolius on nitrogen removal efficiency and greenhouse gas emissions under low C/N influent conditions, comparing vegetated systems with unplanted controls. Vegetated wetlands showed significantly improved nitrogen removal performance. Total N（TN）and NO3--N removal efficiencies decreased with decreasing influent C/N ratios, while NH4+-N removal remained stable under different C/N conditions. Optimal performance was achieved at an influent C/N ratio of 6, with TN, NO3--N, and NH +4-N removal rates reaching 92.82%, 66.24%, and 95.00%, respectively, and a chemical oxygen demand（COD）removal rate of 73.61%. Additionally, N2O emission fluxes increased with higher influent C/N ratios, while CH4 emission fluxes decreased. Planting vegetation significantly reduced the emission fluxes of both N2O and CH4. The cultivation of wetland plants enhanced the nitrogen removal efficiency of constructed wetlands while reducing greenhouse gas emissions, indicating that wetland plants can optimize denitrification performance and regulate greenhouse gas emissions, thereby enabling efficient treatment of low C/N wastewater. |
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