College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China.
Beijing Engineering Research Center of Environmental Material for Water Purification, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
Bioresour Technol. 2023 Sep;383:129251. doi: 10.1016/j.biortech.2023.129251. Epub 2023 Jun 1.
Constructed wetlands (CWs) have emerged as a promising environmentally sustainable technique for wastewater treatment. However, the susceptibility of CWs to disturbances caused by harmful algal blooms (HABs) raises concerns. This study aimed to investigate the impact of HABs on the pollutants' removal performance of CWs and the response of rhizosphere microbial community. Results revealed that CWs possessed an adaptive capacity that enabled them to recover caused by HABs. The rhizosphere was found to stimulate the occurrence of Acinetobacter, which played a critical role to help resist HABs disturbance. This study also observed an increased dissimilatory nitrate reduction metabolic pathway which promoted denitrification and enhanced the nitrogen removal efficiency of CWs. Additionally, the structural equation model further suggested that dissolved oxygen exerted a significant influence on the microbial activities and then affected the pollutants removal performance. Overall, our findings shed light on the mechanism for CW stability maintenance during HABs disturbance.
人工湿地（CWs）作为一种有前途的环境可持续废水处理技术已经出现。然而，CWs 容易受到有害藻类大量繁殖（HABs）的干扰，这引起了人们的关注。本研究旨在调查 HABs 对 CWs 污染物去除性能的影响以及根际微生物群落的响应。结果表明，CWs 具有适应能力，使其能够从 HABs 中恢复。发现根际会刺激不动杆菌的发生，不动杆菌对帮助抵抗 HABs 干扰起着关键作用。本研究还观察到异化硝酸盐还原代谢途径的增加，这促进了反硝化作用，并提高了 CWs 的氮去除效率。此外，结构方程模型进一步表明，溶解氧对微生物活性有显著影响，从而影响污染物的去除性能。总的来说，我们的发现揭示了 CW 在 HABs 干扰期间维持稳定性的机制。
