Key Laboratory of Agro-ecological Processes in Subtropical Regions, Changsha Research Station for Agricultural & Environmental Monitoring, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan 410125, PR China.
Key Laboratory of Agro-ecological Processes in Subtropical Regions, Changsha Research Station for Agricultural & Environmental Monitoring, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan 410125, PR China.
Bioresour Technol. 2019 Oct;289:121687. doi: 10.1016/j.biortech.2019.121687. Epub 2019 Jun 19.
Pilot scale three-stage surface flow constructed wetlands (SFCWs) were constructed to study nitrous oxide (NO) emissions from swine wastewater with different nitrogen levels. The SFCWs had mean total nitrogen (TN) removal efficiencies and removal rates of 84.6-97.1% and 0.6-2.4 g N m d respectively. The NO emissions and nitrate nitrogen (NO-N) concentration both peaked at a TN value of approximately 100 mg N L. NO emissions had a positive correlation with NO-N concentration (p < 0.001). This correlation suggests that the effect of TN loading on NO emissions may be related to NO-N in aquatic environment. Significant correlation was observed between NO emission and the gene abundance of NO reductase (nosZ; p < 0.05). The general linear model revealed that TN loading affected nosZ gene abundance. These results suggest that pollution loading should be considered to balance nitrogen removal and NO emissions when designing constructed wetlands.
采用中试规模三级表面流人工湿地（SFCWs）研究不同氮水平猪废水中一氧化二氮（NO）的排放。SFCWs 的总氮（TN）去除效率和去除率分别为 84.6-97.1%和 0.6-2.4 g N m d。NO 排放量和硝酸盐氮（NO-N）浓度均在 TN 值约为 100 mg N L 时达到峰值。NO 排放量与 NO-N 浓度呈正相关（p < 0.001）。这种相关性表明，TN 负荷对 NO 排放的影响可能与水生环境中的 NO-N 有关。NO 排放与一氧化二氮还原酶（nosZ）基因丰度之间存在显著相关性（p < 0.05）。一般线性模型表明 TN 负荷影响 nosZ 基因丰度。这些结果表明，在设计人工湿地时，应考虑污染负荷以平衡氮去除和 NO 排放。
