Journal of Ecology and Rural Environment ›› 2022, Vol. 38 ›› Issue (9): 1174-1180.doi: 10.19741/j.issn.1673-4831.2021.0679

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Enhanced Treatment of Polluted River Water by Rotating Biological Contactor Combined with Surface Flow Constructed Wetland at North Subtropical in Autumn and Winter

LIU Mao-lin1,2,3, XIAO Sheng-bai1,3, DENG Xiao-yue1,3, LIANG Yin-kun1,3, CHEN Yu-cheng1,3,4, HUANG Lei1,3,4   

  1. 1. College of Resources and Environment, Southwest University, Chongqing 400716, China;
    2. College of Environment and Ecology, Chongqing University, Chongqing 400030, China;
    3. Key Laboratory of the Three Gorges Reservoir Region's Eco-environment, Ministry of Education, Chongqing 400716, China;
    4. Chongqing Engineering Research Center of Rural Cleaning Engineering, Chongqing 400716, China
  • Received:2021-11-04 Online:2022-09-25 Published:2022-09-21

Abstract: Several problems such as poor treatment performance and easy to return to black and odor in autumn and winter are existing in the traditional technologies for the purification of urban polluted river water. By coupling rotating biological contactors (RBCs) and surface flow constructed wetlands (FWSCWs) technology, a bio-ecological combined process was constructed to explore the treatment effects on polluted river water in autumn and winter. The characteristics of microbial population are analyzed, and reveal the relationship between microbial community structure and pollutant enhanced treatment efficiency are revealed. The results show that the removal rates of ammonium (NH4+-N), total nitrogen (TN), total phosphorus (TP) and chemical oxygen demand (COD) were 83.83%, 3.32%, 11.09% and 20.52%, respectively. The effluent concentrations of NH4+-N and COD met with the Ⅲ class and Ⅴ class of the national Environmental Quality Standards for Surface Water (GB 3838-2002), respectively. Nitrospira, Nitrosomonas, Rhodobacter, Lactobacillus, Bacillius, Dechloromonas, Sphingomonas, Comamonas and Acinetobacter were dominant bacteria in the combined process. The abundance of Nitrosomonas and Nitrospira in RBCs was 2.69% and 22.16%, respectively, which ensured the normal nitrosation and nitrification processes in RBCs. The Dechloromonas and Comamonas, as the main denitrifying functional bacteria genus, accounted for 0.73% and 0.48% in FWSCWs, respectively, significantly higher than 0.04% and 0.21% in RBCs, which indicates that denitrification was mainly carried out in FWSCWs in autumn and winter.

Key words: constructed wetland, rotating biological contactor, polluted river water, microbial community, autumn and winter

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