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Enhanced simultaneous organics and nutrients removal in tidal flow constructed wetland using activated alumina as substrate treating domestic wastewater

Tan, Xu, Yang, Yanling, Liu, Yongwang, Li, Xing, Fan, Xiaoyan, Zhou, Zhiwei, Liu, Changjian, Yin, Wenchao
Bioresource technology 2019 v.280 pp. 441-446
aluminum oxide, ammonium nitrogen, biofilm, chemical oxygen demand, denitrifying bacteria, municipal wastewater, nitrifying bacteria, nitrogen, nutrients, phosphorus, shale, wastewater treatment, wetlands
A tidal flow constructed wetland (TFCW), a commonly applied system to clean wastewater, contains a substrate to assist pollutants removal, while the choice of substrate affects the formation of bacterial biofilms. Herein, activated alumina-TFCW (A-TFCW) with hydraulic load of 1.35 m³/(m²·d) parallel with shale ceramisite (S-TFCW) was investigated for treating domestic wastewater, aiming to enhance simultaneous long-term removal of organics, nitrogen and phosphorus. A-TFCW achieved significantly higher COD, NH₄⁺-N, TN and TP removal efficiency than S-TFCW, with the removal efficiency of 85.9% COD, 85.4% NH₄⁺-N, 72.8% TN and 96.4% TP respectively. Denitrifying bacteria dominated in both formed biofilms, with higher relative abundance of nitrifying bacteria and denitrifying bacteria in A-TFCW. These results demonstrated that AA substrate was more suitable to be applied in enhancing the removal performance in TFCW for the treatment of domestic wastewater.