| 刘桃涓,樊欣雨,赵龙,刘奋武.低C/N废水对人工湿地脱氮效果及温室气体排放的影响[J].农业环境科学学报,2026,45(2):468-475. |
| 低C/N废水对人工湿地脱氮效果及温室气体排放的影响 |
| Effects of low C/N ratio wastewater on nitrogen removal and greenhouse gases emissions in constructed wetlands |
| 投稿时间：2025-04-08 修订日期：2025-06-12 |
| DOI：10.11654/jaes.2025-0339 |
| 中文关键词: 人工湿地 C/N 湿地植物 温室气体排放 脱氮效率 |
| 英文关键词: constructed wetland C/N wetland plant greenhouse gas emission nitrogen removal efficiency |
| 基金项目:国家重点研发计划项目（2022YFC3204000，2022YFC3204004） |
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| 中文摘要: |
| 为探究湿地植物在低C/N废水中对人工湿地脱氮效果的强化作用及对温室气体排放效果的调控，以优化人工湿地的脱氮效能与温室气体减排能力，本试验以人工湿地小试系统为研究对象，研究了低 C/N 进水条件下，种植湿地植物（风车草）处理组与未种植物的对照组对人工湿地的脱氮效率及体系的温室气体（Greenhouse gases，GHGs）排放规律。结果表明：湿地植物的种植有助于提高人工湿地脱氮效率，随着进水 C/N 的降低，人工湿地对总氮（TN）、NO3--N 的去除率下降。人工湿地系统对 NH4+-N 的去除效果在不同 C/N 进水条件下无明显差异。当进水 C/N 为 6 时，人工湿地的脱氮效果最佳，对 TN、NO3--N、NH4+-N 的去除率分别为 92.82%、66.24%、95.00%，对化学需氧量的去除率达73.61%。此外，人工湿地中N2O的排放通量随进水C/N的提高而增加，而CH4的排放通量则呈现下降的趋势，且湿地植物的种植降低了N2O和CH4的排放通量。研究表明，湿地植物的种植提高了人工湿地的脱氮效率，同时降低了人工湿地的温室气体排放量，表明湿地植物可优化脱氮效能与调控温室气体排放，实现低C/N污水的高效处理。 |
| 英文摘要: |
| 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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