| Autor: |
Li, Shuangjian1,2 (AUTHOR), Xie, Xuefei1 (AUTHOR), Li, Hu2 (AUTHOR), Xue, Dongmei1 (AUTHOR) xuedongmei@tjnu.edu.cn |
| Předmět: |
|
| Zdroj: |
Environmental Technology. May2024, Vol. 45 Issue 13, p2531-2540. 10p. |
| Abstrakt: |
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 15N 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 µg N h−1 and 0.32 µg N h−1 for denitrification (Denitrif-N2) and anammox (Denitrif-N2), respectively. N2 produced by denitrification occupied 74.04% and produced by anammox occupied 25.96% of the total N2, 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-N2 and Anammox-N2. Nitrate and TOC as the substrates of denitrification demonstrated a significant correlation with Anammox-N2, 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-N2 and Anammox-N2 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 N2 with a good linear relationship (r2 = 0.9334). This could be related to other processes that produced extra N2 in denitrification and anammox system. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
|
