National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu (SEPSORSLD), State Environmental Protection Key Laboratory for Lake Pollution Control, State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; College of Environmental Science and Engineering, Liaoning Technical University, Fuxin 123000, China.
School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China.
J Environ Sci (China). 2022 Jan;111:249-262. doi: 10.1016/j.jes.2021.03.028. Epub 2021 Apr 14.
A pilot-scale multistage constructed wetland-pond (MCWP) system with a "pre-ecological oxidation pond, two-stage horizontal subsurface flow constructed wetland (HSCW) and surface flow constructed wetland (SFCW) as the core and postsubmerged plant pond" as the process was used to treat actual polluted river water in the field, and the variation in nitrogen removal from summer to winter was investigated. The results showed that the average total nitrogen (TN) removal efficiency in the MCWP was approximately 40.74%. The significant positive correlation between the daily highest temperature and the TN removal efficiency of the whole system was fitted with a nonlinear curve (R = 0.7192). The TN removal load rate in the HSCWs was 2.7-3.7 times that in the SFCW. The SFCW, which had high-density plants (35 plants/m), increased the proportion of nitrogen removed by plant harvesting and microbial function. The TN transformed by Iris pseudacorus L. accounted for 54.53% in the SFCW. Furthermore, bacteria completed the nitrogen cycle in the SFCW through a variety of nitrogen removal pathways. This research not only investigated the TN removal performance in an MCWP system but also made it possible to predict the TN removal efficiency according to the daily highest temperature from summer to winter in the field.
采用前置生态氧化塘-两段水平潜流人工湿地（HSCW）-表面流人工湿地（SFCW）为核心，后置潜流植物塘的中试规模多级组合湿地（MCWP）系统对实际受污染河水进行现场处理，并研究了从夏季到冬季氮去除的变化。结果表明，MCWP 的平均总氮（TN）去除效率约为 40.74%。整个系统的日最高温度与 TN 去除效率之间存在显著的正相关关系，拟合出一条非线性曲线（R=0.7192）。HSCWs 的 TN 去除负荷率是 SFCW 的 2.7-3.7 倍。SFCW 中植物密度较高（35 株/m），通过植物收割和微生物功能增加了氮的去除比例。SFCW 中鸢尾属植物（Iris pseudacorus L.）转化的 TN 占比为 54.53%。此外，细菌通过多种氮去除途径完成了 SFCW 中的氮循环。本研究不仅考察了 MCWP 系统中的 TN 去除性能，还根据现场从夏季到冬季的日最高温度预测了 TN 去除效率。
