How Temperature Affects Wastewater Nitrate Removal in a Bioelectrochemically Assisted Constructed Wetland System
Dan Xu1, 2, Enrong Xiao2, Peng Xu2, 3, Yin Zhou2, 3, Qiaohong Zhou2, Dong Xu2, Zhenbin Wu2
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1College of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, P.R. China
2State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology,
Chinese Academy of Sciences, Wuhan 430072, P.R. China
3Graduate University of Chinese Academy of Sciences, Beijing 100039, China
Submission date: 2017-03-20
Final revision date: 2017-07-17
Acceptance date: 2017-07-18
Online publication date: 2018-01-15
Publication date: 2018-01-26
Pol. J. Environ. Stud. 2018;27(2):953-958
A novel bioelectrochemically assisted constructed wetland system (BECW) was investigated using a laboratory-scale experimental apparatus for treating nitrate-contaminated water without an organic carbon source. The BECW was operated at 29 ±1 and 18 ±1ºC, respectively, to explore the effects of temperature on the autotrophic denitrification process. The results showed that higher TN removal efficiency (76.30 ±5.08%) was obtained at higher temperature when compared to a lower temperature (48.18 ±4.40%). The effluent concentrations of NO2--N and NH4+-N at 18 ±1ºC were 0.40 ±0.11 and 0.50 ±0.42 mg N L-1, whereas those at 29 ±1ºC could be neglected. Besides, significant accumulations of NO2--N and NH4+-N were observed in the cathode region at 18 ±1ºC through quantifying different forms of nitrogen that varied along the flow path.
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