College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China.
School of Environment, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Sci Total Environ. 2023 Jun 15;877:162883. doi: 10.1016/j.scitotenv.2023.162883. Epub 2023 Mar 17.
Combination of constructed wetlands (CWs) and microalgae-based technologies has been proved as effective wastewater treatment option; however, little attention was paid to investigate the optimal combination ways. This study showed that the integrated system (IS) connecting microalgal pond with CWs exhibited improved pollutant-removal efficiencies and preferred carbon reduction effects compared to other alternatives such as coupled system or independent CWs. Microbial analysis demonstrated that core microorganisms (e.g., Acinetobacter and Thermomonas) of the IS were mostly associated with carbon, nitrogen, and energy metabolism. Based on co-occurrence networks, microbial quantity with denitrification function in the IS accounted for 71.01 % of the microorganism related to nitrogen metabolism, which was higher than that of 48.84 % in the independent CWs, indicating that the presence of microalgae in IS played important role in promoting biological denitrification. These findings provide insights into the microbial mechanism and highlights the complementary effects between microalgae and CWs.
组合湿地（CWs）和基于微藻的技术已被证明是有效的废水处理方法；然而，很少有人关注研究最佳的组合方式。本研究表明，与其他替代方案（如耦合系统或独立 CWs）相比，连接微藻塘和 CWs 的集成系统（IS）表现出了更高的污染物去除效率和更优的碳减排效果。微生物分析表明，IS 的核心微生物（如不动杆菌属和嗜热单胞菌属）主要与碳、氮和能量代谢有关。基于共现网络，IS 中具有反硝化功能的微生物数量占与氮代谢相关的微生物的 71.01%，高于独立 CWs 中的 48.84%，这表明 IS 中微藻的存在在促进生物反硝化方面发挥了重要作用。这些发现为微生物机制提供了新的见解，并强调了微藻和 CWs 之间的互补作用。
