College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, PR China.
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, PR China.
Bioresour Technol. 2018 Aug;261:461-464. doi: 10.1016/j.biortech.2018.04.028. Epub 2018 Apr 10.
Nitrogen removal in vertical flow constructed wetlands (VFCWs) is still a key problem especially for treating low C/N wastewaters. In this study, nitrogen removal and nitrous oxide (NO) emission in biochar-amended aerated VFCWs were evaluated under the varying intermittent aeration (different aeration times and aeration rates). The results indicated that the optimal aeration time and rate were 2 h d and 0.6 L min, which could create alternant of aerobic and anaerobic conditions for the simultaneous nitrification and denitrification in VFCWs. Much higher removal efficiency of COD (95.9%), NH-N (96.6%), and TN (74.7%) was achieved under the optimal conditions, and moderate NO emission (282 μg m·h) was observed simultaneously. The results can be used to select the optimal aeration in the further design and application of biochar-amended aerated CW treatments.
在垂直流人工湿地（VFCWs）中去除氮仍然是一个关键问题，特别是对于处理低 C/N 废水而言。本研究在不同间歇曝气（不同曝气时间和曝气率）条件下，评估了生物炭改良曝气 VFCWs 中的氮去除和氧化亚氮（NO）排放情况。结果表明，最优曝气时间和速率分别为 2 h d 和 0.6 L min，这可为 VFCWs 中的同步硝化反硝化创造好氧和厌氧条件的交替。在最优条件下，COD（95.9%）、NH-N（96.6%）和 TN（74.7%）的去除效率更高，同时观察到适度的 NO 排放（282 μg m·h）。这些结果可用于在进一步设计和应用生物炭改良曝气 CW 处理时选择最佳曝气条件。
