Autotrophic nitrogen removal from ammonium at low applied voltage in a single-compartment microbial electrolysis cell

Bioresource Technology
Guoqiang ZhanJunwei Qian

Abstract

A new approach was developed to achieve autotrophic nitrogen removal from ammonium at low applied voltage in a single-compartment 3-dimensional microbial electrolysis cell (MEC). The MEC consisted of anodic and cathodic electrodes, on which nitrifying and denitrifying biofilms, respectively, were attached. Nitrogen removal can be enhanced at an applied voltage in the MEC. Besides, the nitrogen removal efficiency gradually increased from 70.3% to 92.6% with the increase of applied voltage from 0.2 to 0.4V, as well as the maximum current was varied from 4.4 to 14 mA. The corresponding coulombic efficiency also increased from 82% to 94.4%, indicating that the increasing applied voltage could enhance electron extraction from ammonium during its oxidative removal. The DO was found to be a critical factor which affected the nitrogen removal in this MEC system. These results demonstrated that the MEC process was applicable to achieve autotrophic nitrogen removal from wastewater containing ammonium.

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Citations

Jan 7, 2014·Bioresource Technology·Patrick T Kelly, Zhen He
Oct 9, 2014·Environmental Technology·Abbas RezaeeHoshyar Hossini
Jan 1, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Yicheng WuZejie Wang
Oct 7, 2017·Microbial Biotechnology·Narcís PousSebastià Puig
Nov 30, 2020·The Science of the Total Environment·Hongbo LiuEric Lichtfouse
Aug 5, 2021·The Science of the Total Environment·Carlos R Chan-PachecoGuillermo Quijano

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