Journal of East China Normal University(Natural Sc ›› 2018, Vol. 2018 ›› Issue (6): 59-67.doi: 10.3969/j.issn.1000-5641.2018.06.007

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Enhanced denitrification for rural domestic sewage by a vertical flow constructed wetland

CUI He1,2, LU Xin-yu1,2, CHANG Yue-ya1,2, HUANG Min-sheng1,2, LI Dan1,2, HE Yan1,2, CAO Cheng-jin1,2   

  1. 1. School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China;
    2. Shanghai Key Laboratory for Urban Ecological Processes and Eco-Restoration, East China Normal University, Shanghai 200241, China
  • Received:2018-09-04 Online:2018-11-25 Published:2018-12-01

Abstract: Two pilot-scale vertical flow artificial wetlands with "ceramic" as a single filler and "ceramic+zeolite" as composite fillers were studied, and their respective denitrification performance for rural domestic sewage was evaluated. To understand the denitrification mechanism of the two wetlands, the contribution rate of nitrogen removal by plant absorption and the diversity of the microbial community were analyzed. The object of this study was to provide a theoretical basis for the application of this wetland design to enhance denitrification at rural domestic sewage treatment plants. The results show that the mean removal rate of NH4+-N and TN by the vertical flow artificial wetland with "ceramic+zeolite" as composite fillers was 23% and 25% higher, respectively, than that of "ceramic" as single filler; the NH4+-N and TN concentration of the "ceramic+zeolite" wetland both attained Grade 1-B (GB 18918-2002). The contribution rate of plant absorption for nitrogen removal in the two wetlands was both less than 0.5%. Hence, nitrogen removal was primarily dependent on adsorption by the filler materialss and purification by microorganisms. The biofilm of plant roots and fillers in the wetland with "ceramic+zeolite" composite filler had better microbial community diversity. The concentration of bacteria with nitrogen removal capability (nitrification and denitrification) in the two vertical flow constructed wetlands were substantial, enabling enhanced denitrification of rural domestic sewage.

Key words: vertical flow constructed wetland, fillers combination, rural domestic sewage, enhanced denitrification, microbial community

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