Abstract
In this study, hybrid constructed wetlands (HCW) with functional substrates (vermiculite-tourmaline modified polyurethane) were constructed to investigate nitrogen removal efficiency and metabolic cooperation mechanisms for treating rural contaminated surface water with natural temperature fluctuations. The results show that within a natural temperature fluctuation range of 9–25 °C, the HCW achieved an average nitrate nitrogen removal efficiency of 98 % and a total nitrogen removal efficiency of 76 %, with effluent total nitrogen less than 5 mg/L. The rational secretion of extracellular polymeric substance and the analysis of microbial community structure revealed that functional substrate favors biofilm formation, increases the activity of Candidatus_Brocadia and Thauera, and enhances ammonia and nitrate reduction. These findings elucidate the ecological patterns exhibited by microorganisms during the process of functional substrate intensification. Overall, this study offers valuable guidance for constructing HCW to treat contaminated surface water.
Published Version
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