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A dicyclic-type electrode-based biofilm reactor for simultaneous nitrate and Cr(VI) reduction

  • Siyuan Zhai
  • Yingxin Zhao
  • Min Ji
  • Wenfang Qi
Rapid Communication

Abstract

A dicyclic-type electrode-based biofilm-electrode reactor (BER) was investigated for simultaneous removal of nitrate and Cr(VI). In the absence of Cr(VI), almost complete denitrification of 50 mg/L NO3–N was achieved at a very low C/N ratio of 0.8 with the optimal current of 50 mA. Cr(VI) was removed by biological reduction and co-precipitation when Cr(VI) was taken as the only electron acceptor, and the removal efficiencies of Cr(VI) were 99.8%. In the coexistent system of nitrate and Cr(VI), nitrate removal was the result of the cooperation of hydrogenotrophic denitrification and heterotrophic denitrification. The methanol and H2 were also used as electron donors for biological reduction Cr(VI). The denitrification process was slightly inhibited by 1.00 mg/L Cr(VI) and 94.15% removal efficiency was achieved at current = 50 mA and HRT = 8 h. The present results show that the biofilm-electrode reactor is an effective way to simultaneous remove co-contaminants.

Graphical abstract

Keywords

Denitricfication Cr(VI) reduction Biofilm-electrode reactor Mechanism 

Notes

Acknowledgements

Authors are grateful for the financial support from the Tianjin Research Program of Application Foundation and Advanced Technology (Project No. 15JCQNJC08700, China), the National Natural Science Foundation of China (Project No. 21507101, China).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Siyuan Zhai
    • 1
  • Yingxin Zhao
    • 1
    • 2
  • Min Ji
    • 1
    • 2
  • Wenfang Qi
    • 1
  1. 1.School of Environmental Science and EngineeringTianjin UniversityTianjinChina
  2. 2.Tianjin Engineering Center of Urban River Eco-Purification TechnologyTianjinChina

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