Institute of Wetland Ecology, School of Life Science, Nanjing University, Nanjing 210093, China.
Institute of Wetland Ecology, School of Life Science, Nanjing University, Nanjing 210093, China.
Bioresour Technol. 2020 Sep;311:123583. doi: 10.1016/j.biortech.2020.123583. Epub 2020 May 25.
The objective of this study was to identify the proper re-startup strategies (RSSs) for constructed wetlands (CWs) after long-term resting operation in terms of the recovery of pollutant removal efficiency (RE) and N-cycle gene abundance. The results suggested that backwashing increased the gene abundance without shortening the recovery time of gene abundance. The RSS involving excavation and washing performed better in terms of chemical oxygen demand (COD) RE, especially at the beginning, and performed slightly better or similarly in terms of N-cycle gene abundance and the REs of ammonia nitrogen (NH-N) and total nitrogen (TN). The abundance of the Amox gene was 66.1-92.8, 76.3-161.8 and 1550-2492 times larger than that of the napA, narG and amoA genes, respectively, and the anammox process was the dominant N removal pathway. Therefore, excavation and washing is recommended as the RSS for CWs with a long-term rest period.
本研究旨在从污染物去除效率（RE）和氮循环基因丰度的恢复角度出发，确定长期停产后人工湿地（CWs）的适当重启策略（RSS）。结果表明，反冲洗提高了基因丰度，而没有缩短基因丰度的恢复时间。挖掘和冲洗相结合的 RSS 在化学需氧量（COD）RE 方面表现更好，特别是在开始时，在氮循环基因丰度以及氨氮（NH-N）和总氮（TN）的 RE 方面表现稍好或相似。Amox 基因的丰度分别比 napA、narG 和 amoA 基因大 66.1-92.8、76.3-161.8 和 1550-2492 倍，厌氧氨氧化过程是主要的氮去除途径。因此，建议对长期休眠的 CWs 采用挖掘和冲洗作为 RSS。
