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New insight for purifying polluted river water using the combination of large-scale rotating biological contactors and integrated constructed wetlands in the cold season

文献类型： 外文期刊

作者： Huang, Lei 1 ; Bao, Jun'an 1 ; Zhao, Fang 1 ; Liang, Yinkun 1 ; Chen, Yucheng 1 ;

作者机构： 1.Southwest Univ, Key Lab Three Gorges Reservoir Reg Ecoenvironm, Minist Educ, Coll Resources & Environm, Chongqing 400715, Peoples R China

2.Chongqing Key Lab Agr Resources & Environm, Chongqing 400716, Peoples R China

关键词： Rotating biological contactor; Constructed wetland; Polluted river water; Purification effect; Microbial community; Cold season

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.0； 五年影响因子：7.9 ）

ISSN： 0301-4797

年卷期： 2022 年 324 卷

页码：

收录情况： SCI

摘要： Ecological treatment technologies, applied to deal with polluted river water in the low temperature season, remain limited. In this study, a new insight was put forward for purifying polluted river water using a combination system (CS) of large-scale rotating biological contactors (RBCs) and integrated constructed wetlands in autumn and winter. The treatment performance, average removal contribution (RC), nitrification and denitrification rates, microbial community structure, and ecosystem service value were considered to estimate the combination system. Results revealed that the average removal efficiencies of ammonium (NH4+-N), total nitrogen (TN), total phosphorus (TP), and chemical oxygen demand (COD) reached 93.9%, 20.8%, 36.5%, and 37.1%, respectively. The combination system showed excellent removal efficiency of NH4+-N regardless of the effect of low temperature. The maximum values of nitrification and denitrification rates were 59.57 g N/(m(3).cl) and 0.78 g N/(m(2).d), respectively. Considerable differences in bacterial community diversity, richness and relative abundance of functional microbes were observed in the main treatment units, resulting in different average RC to pollutants. The unit capital cost of CS purifying polluted river water was 260 USD/m(3) and the operation and maintenance cost was 0.144 million USD/yr. Meanwhile, the ecosystem service value of the CS was 0.334 million USD in autumn and winter. CS not only possessed excellent pollutant purifying efficiencies, but also achieved high ecological service value in the cold season.

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