title: Autotrophic nitrogen removal from ammonium at low applied voltage in a single-compartment microbial electrolysis cell.
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.
authors.affiliation: Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
authors.forename: Guoqiang
authors.initials: G
authors.lastname: Zhan
authors.forename: Lixia
authors.initials: L
authors.lastname: Zhang
authors.forename: Daping
authors.initials: D
authors.lastname: Li
authors.forename: Wentao
authors.initials: W
authors.lastname: Su
authors.forename: Yong
authors.initials: Y
authors.lastname: Tao
authors.forename: Junwei
authors.initials: J
authors.lastname: Qian
mesh_terms: D052818:Autotrophic Processes / Q000187:drug effects / Q000502:physiology*; D001673:Biodegradation, Environmental / Q000187:drug effects; D001674:Bioelectric Energy Sources / Q000382:microbiology*; D004560:Electricity; D055664:Electrochemical Techniques; D004572:Electrolysis / Q000295:instrumentation*; D009566:Nitrates / Q000032:analysis; D009573:Nitrites / Q000032:analysis; D009584:Nitrogen / Q000032:analysis / Q000302:isolation & purification*; D010100:Oxygen / Q000494:pharmacology; D000644:Quaternary Ammonium Compounds / Q000032:analysis / Q000737:chemistry* / Q000494:pharmacology; D014865:Waste Disposal, Fluid
chemical_list: D009566:Nitrates; D009573:Nitrites; D000644:Quaternary Ammonium Compounds; D009584:Nitrogen; D010100:Oxygen