反硝化
湿地
硝酸盐
流出物
废水
环境工程
环境化学
环境科学
人工湿地
硝化作用
地下水流
沸石
化学
氮气
生态学
地下水
催化作用
地质学
生物
有机化学
生物化学
岩土工程
作者
Xuekang Cao,Lei Jiang,Hao Zheng,Yong Liao,Qian Zhang,Qiushi Shen,Yuanxiang Mao,Fangying Ji,Dezhi Shi
标识
DOI:10.1016/j.biortech.2021.126185
摘要
Constructed wetlands (CWs) offer a promising method to treat domestic wastewater in rural areas, but CWs usually limiting in nitrogen removal and large area. In this study, zeolite and pyrite were used to construct tidal wetlands to address the problems of insufficient oxygen supply and carbon source. The results show that the fully drained wetland achieved the highest ammonia removal load of 34.67 ± 1.72 g/(m2·d) with 8.57 ± 1.13 mg/L of effluent. Pyrite was found to compensate for the lack of carbon source in the denitrification process in half-drained wetland, which achieved a 78.36 ± 5.3% TN removal rate with 7.09 ± 1.85 mg/L effluent concentration. Pyrite released Fe(II) to promote nitrate reduction for denitrification in the subsequent flooded period. Microbial community analysis indicates that the tidal flow constructed wetlands simultaneously achieved nitrification and denitrification by the coupling of in-situ zeolite regeneration and Fe(II) oxidation denitrification.
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