Impact of operating mode variability on pollutant removal and microbial dynamics in a stacked hybrid constructed wetland: Implications for performance optimization

被引：0
|
作者：
Zhang, Qionghua [1 ,2 ]
Zhao, Tianbo [1 ,3 ]
Xie, Yadong [1 ,3 ]
Zhang, Haoming [1 ,3 ]
Wang, Xiaochang C. [1 ,2 ]
Dzakpasu, Mawuli [2 ,3 ]
机构：
[1] Key Lab of Northwest Water Resource, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an,710055, China
[2] International Science & Technology Cooperation Centre for Urban Alternative Water Resources Development, Xi'an University of Architecture and Technology, Xi'an,710055, China
[3] School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an,710055, China
来源：
Chemosphere | 2025年 / 372卷
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1016/j.chemosphere.2025.144130
中图分类号：
学科分类号：
摘要：
This study innovatively developed a stacked hybrid constructed wetland, integrating the advantages of both free-water surface and subsurface flow constructed wetlands for enhanced treatment of sewage plant effluent. The effects of three different operation modes–Anoxic subsurface flow, Oxic subsurface flow, and Oxic subsurface flow with step-feeding–on sewage plant effluent treatment were thoroughly examined. Results indicated that all three modes exhibited excellent pollutant removal capabilities. Notably, the average removal rates of NH4+-N, TP, and COD approached 100% under the Oxic subsurface flow with step-feeding mode, while the average removal rate of TN reached 48.18 ± 1.86%. Additionally, the findings show that different operating modes significantly influenced the primary functional microorganisms in the wetland system. Paenarthrobacter, Nitrospira, and Dechloromonas emerged as dominant bacteria in both the Oxic subsurface flow mode and the Oxic subsurface flow with step-feeding mode, contributing to a diversified nitrogen metabolism pathway. The stacked hybrid constructed wetland demonstrated robust pollutant removal efficiency and rich microbial diversity, making it suitable for the advanced treatment of sewage treatment plant effluents. © 2025 Elsevier Ltd
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