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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.

How Temperature Affects Wastewater Nitrate Removal in a Bioelectrochemically Assisted Constructed Wetland System