Simultaneous Nitrification and Denitrification in Biofilm-Electrode Reactor

Abstract:

To study the nitrification and denitrification in compartmented biofilm-electrode reactor (C-BER) under limited oxygen, influence of mild electrolysis on nitrogen removal was investigated under low C/N (mole ratios) with dissolved oxygen about 1mg/ L. It was found that nitrogen removal was mainly through simultaneous nitrification and denitrification (SND). C/N ratio was 1, average total nitrogen (TN) removal efficiencies were 33% and 45% for electric current of 5 and 15mA. C/N was 0.5, electric current was 25mA and effluent was recirculated, TN removal efficiency increased to 60%, within which autotrophic denitrification accounted for about 51%. There was about 50% NH3-N reduced under 15mA when C/N ratio was 1, this increased to 70% for 25mA when C/N ratio was 0.5. Nevertheless, TN reduced between anode and cathodes accounted for 64% in all. The experimental results show that both higher electric current and effluent recirculation are good for SND process under oxygen-limited condition, nitrogen removal can be activated by mild electrolysis.

• Periodical: Advanced Materials Research (Volumes 652-654)
• Pages: 1633-1636
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.652-654.1633
• Online since: January 2013
• Authors: Xiao Liu, Mei Yang, Xian Huai Huang
• Keywords: Biofilm-Electrode Reactor, Mild Electrolysis, Simultaneous Nitrification and Denitrification

References

[1] Hibiya Kazuaki, Terada Akihiko, Tsuneda Satoshi, Hirata Akira: Journal of Biotechnol. Vol. 100(2003), p.23

[2] Kuroda M, Watanabe T, Umedu Y: Wat Sci Tech. Vol .34(1996), p.101

[3] Sakakibara Y, Araki K, Watanabe T et al: Wat Sci Tech. Vol. 36(1997), p.61

[4] X. H Huang, L. N. BAO, L. M. MA: J. of Harbin Institute of Technology. Vol. 35(2003), p.1486

[5] Prosnansky M, Sakskibara Y, Kuroda M: Wat Res. Vol. 6(2002) p.4801

[6] L. H. Zhang, J.P. Jia, Y.C. Zhu, N.W. Zhu, Y.L. Wang, J. Yang: Biochemical Engineering Journal. Vol. 22(2005). P.239

[7] Chinese NEPA: Water and wastewater monitoring methods, 4th, Chinese Environmental Science Publishing House, Beijing, (2003)