Bioelectrochemically enhanced autotrophic Feammox for ammonium removal via the Fe(ii)/Fe(iii) cycle

Abstract

Autotrophic anaerobic ammonium oxidation coupled to Fe(III) reduction (Feammox) is a potential technology for removing ammonium from low-C/N wastewater, but it requires a continuous supply of Fe(III) source. To reduce the supply, a microbial electrolysis cell (MEC) was employed to allow iron recycling in Feammox under different voltages (0.2 V, 0.6 V, and 1.0 V). Results showed that the optimal voltage was 0.6 V, with a maximum efficiency for ammonium oxidation of 71%. The ammonium oxidation rate achieved 2.5 ± 0.1 mg N L−1 per day, which was 3 times that of conventional Feammox. Cyclic voltammetry confirmed that ammonium oxidation and iron redox occurred on the anode. The bacterial population had a unique evolutionary direction at 0.6 V, with Geobacteraceae becoming the dominant family. Positive interactions between nitrogen-related bacteria and iron-related bacteria enhanced the autotrophic Feammox process. This study will further advance Feammox in the treatment of ammonium-containing wastewater.

Graphical abstract: Bioelectrochemically enhanced autotrophic Feammox for ammonium removal via the Fe(ii)/Fe(iii) cycle

Supplementary files

Article information

Article type
Paper
Submitted
30 Jan 2024
Accepted
07 Apr 2024
First published
19 Apr 2024

Environ. Sci.: Water Res. Technol., 2024, Advance Article

Bioelectrochemically enhanced autotrophic Feammox for ammonium removal via the Fe(II)/Fe(III) cycle

T. Wang, J. Zhang, Z. Wang, Q. Zhao, Y. Wu, N. Li, X. Jiang and X. Wang, Environ. Sci.: Water Res. Technol., 2024, Advance Article , DOI: 10.1039/D4EW00074A

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