SONGXin-yu,LIDa-peng,LIUSong-qi.Nitrogen Removal Effect and Greenhouse Gas Emission in Fe-C Based Intermittent Aeration Constructed Wetlands[J].China Water & Wastewater,2025,41(21):10-16.
铁炭基间歇曝气人工湿地脱氮和温室气体排放规律
- Title:
- Nitrogen Removal Effect and Greenhouse Gas Emission in Fe-C Based Intermittent Aeration Constructed Wetlands
- Keywords:
- intermittent aeration constructed wetland; greenhouse gas; pyrite; biochar; deep nitrogen removal of tailwater
- 摘要:
- 受尾水中可利用碳源不足以及低温影响，传统人工湿地的总氮（TN）去除效率偏低，且伴随大量温室气体（N2O、CO2和CH4）释放。采用生物炭和黄铁矿作为基质，探究铁炭基间歇曝气人工湿地对低碳氮比（C/N）的污水处理厂尾水的脱氮效果、温室气体排放情况以及温度对脱氮效果的影响。结果显示，在10和25 ℃条件下，铁炭基人工湿地对TN的去除率比普通砾石人工湿地分别提高了17.1%和11.5%，同时产生的温室效应并没有显著高于普通砾石人工湿地；温度对氨氮（NH4+-N）的去除效果无影响，但低温不利于硝态氮（NO3--N）去除，致使TN去除效率不高。系统中微生物的硝化功能基因amoA和反硝化功能基因nosZ丰度不受低温影响，对应的氨单加氧酶（AMO）和氧化亚氮还原酶（NOS）活性降低，是限制TN去除效率的关键原因。
- Abstract:
- The removal efficiency of total nitrogen (TN) in traditional constructed wetlands (CWs) is limited by the insufficient availability of carbon sources in tailwater and low-temperature conditions, which is also accompanied by significant greenhouse gas (GHG) emissions, including N2O, CO2, and CH4. Biochar and pyrite were employed as substrates to investigate the nitrogen removal performance and GHG emissions of Fe-C based intermittent aeration CWs for treating tailwater with a low carbon-to-nitrogen (C/N) ratio. Additionally, the impact of temperature on the nitrogen removal efficiency of Fe-C based intermittent aeration CWs was evaluated. Results showed that the Fe-C based CW achieved 17.1% and 11.5% higher TN removal than conventional gravel CW at 10 ℃and 25 ℃, respectively, without contributing to additional GHG emissions. Temperature had no significant effect on ammonia nitrogen (NH4+-N) removal, but low temperatures hindered nitrate nitrogen (NO3--N) removal, leading to inefficient TN removal. The abundance of nitrification functional genes (amoA) and denitrification functional genes (nosZ) in the system remained unaffected by low temperatures. However, the decreased activities of ammonia monooxygenase (AMO) and nitrous oxide reductase (NOS) were identified as the key factors limiting TN removal performance.
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