Pous Narcís, Bañeras Lluis, Corvini Philippe F-X, Liu Shuang-Jiang, Puig Sebastià
Laboratory of Chemical and Environmental Engineering (LEQUiA), Institute of the Environment, University of Girona, Carrer Maria Aurèlia Capmany, 69, E-17003, Girona, Spain.
Group of Environmental Microbial Ecology, Institute of Aquatic Ecology, University of Girona, C/Maria Aurèlia Capmany, 40, E-17003, Girona, Spain.
Environ Sci Ecotechnol. 2023 Feb 16;15:100253. doi: 10.1016/j.ese.2023.100253. eCollection 2023 Jul.
It has been recently suggested that use a previously unknown pathway to convert ammonium into dinitrogen gas (Dirammox) via hydroxylamine (NHOH). This fact alone already implies a significant decrease in the aeration requirements for the process, but the process would still be dependent on external aeration. This work studied the potential use of a polarised electrode as an electron acceptor for ammonium oxidation using the recently described strain HO-1 as a model heterotrophic nitrifier. Results indicated that strain HO-1 requires aeration for metabolism, a requirement that cannot be replaced for a polarised electrode alone. However, concomitant elimination of succinate and ammonium was observed when operating a previously grown strain HO-1 culture in the presence of a polarised electrode and without aeration. The usage of a polarised electrode together with aeration did not increase the succinate nor the nitrogen removal rates observed with aeration alone. However, current density generation was observed along a feeding batch test representing an electron share of 3% of the ammonium removed in the presence of aeration and 16% without aeration. Additional tests suggested that hydroxylamine oxidation to dinitrogen gas could have a relevant role in the electron discharge onto the anode. Therefore, the presence of a polarised electrode supported the metabolic functions of strain HO-1 on the simultaneous oxidation of succinate and ammonium.
最近有人提出，利用一种此前未知的途径，通过羟胺（NHOH）将铵转化为氮气（双氨氧化）。仅这一事实就已经意味着该过程的曝气需求将大幅降低，但该过程仍将依赖外部曝气。这项工作研究了使用极化电极作为铵氧化的电子受体的潜在用途，以最近描述的HO-1菌株作为模型异养硝化菌。结果表明，HO-1菌株的代谢需要曝气，这一需求不能仅由极化电极来替代。然而，在极化电极存在且无曝气的情况下，对先前培养的HO-1菌株进行操作时，观察到琥珀酸盐和铵的同时去除。极化电极与曝气一起使用并没有提高单独曝气时观察到的琥珀酸盐去除率或氮去除率。然而，在一个进料分批试验中观察到了电流密度的产生，在有曝气的情况下，电流占去除铵的3%，在无曝气的情况下占16%。额外的试验表明，羟胺氧化为氮气可能在电子向阳极放电过程中起相关作用。因此，极化电极的存在支持了HO-1菌株对琥珀酸盐和铵同时氧化的代谢功能。
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