Relationship between denitrification and anammox rates and N-2 production with substrate consumption and pH in a riparian zone

文献类型： 外文期刊

第一作者： Li, Shuangjian

作者： Li, Shuangjian;Xie, Xuefei;Xue, Dongmei;Li, Shuangjian;Li, Hu;Xue, Dongmei

作者机构：

关键词： Denitrification rate; anammox rate; slurry-based N-15 tracer incubation; quantitative relationship; nitrogen mass balance

期刊名称：ENVIRONMENTAL TECHNOLOGY （ 影响因子：2.8； 五年影响因子：2.8 ）

ISSN： 0959-3330

年卷期： 2023 年

页码：

收录情况： SCI

摘要： Denitrification and anaerobic ammonium oxidation (anammox) are the key processes to quantitatively remove nitrate (NO3-) and balance the nitrogen (N) budget of the ecosystem. In this paper, a slurry-based N-15 tracer approach was used to study the correlation and quantitative relation of substrate consumption and pH with rates of denitrification and anammox in a riparian zone. The results showed that the fastest rates of 0.93 mu g N h(-1) and 0.32 mu g N h(-1) for denitrification (Denitrif-N-2) and anammox (Denitrif-N-2), respectively. N-2 produced by denitrification occupied 74.04% and produced by anammox occupied 25.96% of the total N-2, proving denitrification is the dominant process to remove NO3-. The substrate content (NO3-, NH4+ and TOC) and pH varied during incubation and were significantly correlated with Dentrif-N-2 and Anammox-N-2. Nitrate and TOC as the substrates of denitrification demonstrated a significant correlation with Anammox-N-2, which was associated with the products of denitrification involved in the anammox process. This proved a coupling of denitrification and anammox. A quantitative relationship was observed between Dentrif-N-2 and Anammox-N-2 in the range of 2.75-2.90 when TOC, NH4+ and NO3- consumption per unit mass or pH changed per unit. Nitrogen mass balance analysis showed that 1 mg N substrate (NO3-+NH4+) consumption in the denitrification and anammox can produce 1.05 mg N-2 with a good linear relationship (r(2 )= 0.9334). This could be related to other processes that produced extra N-2 in denitrification and anammox system.

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