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Huang L, Wang N, Deng C, Liang Y, Wang Q, Liu M, Chen Y. Interactive effect of carbon source with influent COD/N on nitrogen removal and microbial community structure in subsurface flow constructed wetlands. J Environ Manage 2019; 250:109491. [PMID: 31521034 DOI: 10.1016/j.jenvman.2019.109491] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 07/31/2019] [Accepted: 08/28/2019] [Indexed: 06/10/2023]
Abstract
Carbon source and influent COD/N (chemical oxygen demand: total nitrogen) pose distinct effects on nitrogen removal efficiency and microbial community structure of constructed wetlands. To investigate the interactive effect of carbon source with COD/N on nitrogen removal and microbial community structure in subsurface flow constructed wetlands, glucose (C6H12O6) and sodium acetate (C2H3NaO2) were used to determine five COD/N ratios in nine groups of constructed wetlands divided into glucose constructed wetlands and sodium acetate constructed wetlands. Results showed that efficiency in COD removal increased with COD/N, and peak value reached 92.7%. Interactive effect of carbon source with COD/N on system pH and ammonium removal was notably significant. Differences in ammonium removal performance between treatments were achieved by the variation of influent COD/N ratio and the change of system pH resulted from different carbon sources, and the result suggested that glucose was a better choice at high COD/N ratio. System microbial community structure was significantly affected by carbon source, influent COD/N ratio and their interaction. Microbial biomass in constructed wetlands significantly increased with increasing COD/N ratio. Higher density and diversity of fungus were observed in glucose constructed wetlands, particularly at COD/N ratio of 7 and 10.
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Affiliation(s)
- Lei Huang
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (Ministry of Education), College of Resource and Environment, Southwest University, Chongqing, 400715, PR China; Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing, 400716, PR China
| | - Ning Wang
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (Ministry of Education), College of Resource and Environment, Southwest University, Chongqing, 400715, PR China; Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing, 400716, PR China
| | - Chaoren Deng
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (Ministry of Education), College of Resource and Environment, Southwest University, Chongqing, 400715, PR China; Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing, 400716, PR China
| | - Yinkun Liang
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (Ministry of Education), College of Resource and Environment, Southwest University, Chongqing, 400715, PR China; Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing, 400716, PR China
| | - Qinghua Wang
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (Ministry of Education), College of Resource and Environment, Southwest University, Chongqing, 400715, PR China
| | - Maolin Liu
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (Ministry of Education), College of Resource and Environment, Southwest University, Chongqing, 400715, PR China
| | - Yucheng Chen
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (Ministry of Education), College of Resource and Environment, Southwest University, Chongqing, 400715, PR China; Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing, 400716, PR China.
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