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| Analysis of the enhancement of denitrification efficiency in vertical flow constructed wetlands by supported nanoscale zero valent iron(nZVI) |
| Received:April 12, 2017 |
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| KeyWord:supported nanoscale zero-valent iron;denitrification;C/N ratio;vertical flow constructed wetlands |
| Author Name | Affiliation | E-mail | | LIN Fan-da | College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China | | | SONG Xin-shan | College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China | newmountain@163.com | | ZHAO Zhi-miao | College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China | | | ZHAO Yu-feng | College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China | | | WANG Yu-hui | College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China | | | DONG Guo-qiang | College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China | | | WANG Bo-di | College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China | |
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| Abstract: |
| In the treatment of low C/N sewage, the shortage of electron donors is a major factor inhibiting denitrification efficiency. Through the addition of supported nanoscale zero valent iron(nZVI) to the anoxic denitrification zone in vertical flow constructed wetlands(CWs), we examined the influence of the dosage of supported nZVI on the denitrification efficiency for different C/N ratios in the influent. The results showed that the addition of 4 g supported nZVI into CW experimental equipment was optimal; when the C/N of the influent was 6, the hydraulic retention time was 1 day, and the NO3--N concentration of the influent was 50 mg·L-1. Additionally, the removal rate of NO3--N was 15% high when adding 4 g supported nZVI to the CW experimental equipment than that in a CW reactor without the addition of supported nZVI. The pH and concentrations of NH4+-N and NO2--N in the effluent of CWs showed an increasing trend following the addition of supported nZVI. The removal efficiency of NO3--N increased as the C/N ratio increased from 0 to 6. There was a synergistic effect between C/N and the dosage of supported nZVI; thus, the presence of carbon sources could promote the involvement of supported nZVI in denitrification in CWs. |
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