Nitrous oxide emissions from pilot scale three-stage constructed wetlands with variable nitrogen loading
Nitrous oxide emissions from pilot scale three-stage constructed wetlands with variable nitrogen loading
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可变氮负荷中试规模三阶段人工湿地的一氧化二氮排放
DOI：
10.1016/j.biortech.2019.121687
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发表时间：
2019
影响因子：
11.4
通讯作者：
Wu Jinshui
中科院分区：
文献类型：
--
作者：
Zhang Shunan;Liu Feng;Luo Pei;Xiao Runlin;Zhu Huixiang;Wu Jinshui
构建了中试规模的三级表面流人工湿地，研究了不同氮素水平下养猪场废水中氧化亚氮(N2O)的排放。SFCW对总氮(TN)的平均去除效率为84.6~97.1%，总氮(TN)的平均去除效率为0.6~2.4 g N m−2d−1。N2O排放量和硝态氮(NO3--N)浓度均在TN值为100 mg N L−1左右时达到峰值。N2O排放量与NO3--N浓度呈正相关(p<； 0.001)。这种相关性表明，TN负荷对N2O排放的影响可能与水环境中的NO3--N有关。N2O排放量与N2O还原酶基因丰度(nosZ；p<； )显著相关。一般线性模型表明，TN含量影响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，以平衡脱氮和N2O排放。
Pilot scale three-stage surface flow constructed wetlands (SFCWs) were constructed to study nitrous oxide (N2O) 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−2d−1respectively. The N2O emissions and nitrate nitrogen (NO3–-N) concentration both peaked at a TN value of approximately 100 mg N L−1. N2O emissions had a positive correlation with NO3–-N concentration (p< 0.001). This correlation suggests that the effect of TN loading on N2O emissions may be related to NO3–-N in aquatic environment. Significant correlation was observed between N2O emission and the gene abundance of N2O reductase (nosZ;p< 0.05). The general linear model revealed that TN loading affectednosZgene abundance. These results suggest that pollution loading should be considered to balance nitrogen removal and N2O emissions when designing constructed wetlands.