{"type": "FeatureCollection", "features": [{"id": "10.1016/j.biteb.2022.100975", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-23T16:15:42Z", "type": "Journal Article", "created": "2022-02-05", "title": "Unveiling microbial electricity driven anoxic ammonium removal", "description": "Microbial electricity-driven anoxic ammonium removal could remove ammonium from wastewater without the presence of oxygen (aeration) using electricity. This study aims at unveiling the potential biologic pathways for the bioelectrochemical oxidation of ammonium to dinitrogen gas in an anaerobic bioelectrochemical system (BES). Known intermediate metabolites of this process (hydroxylamine, nitrite and nitrate) were monitored in two BES replicates. Ammonium was fully oxidized to dinitrogen gas without intermediates accumulation in the anodic chamber. Achromobacter sp. was the most abundant microorganism (up to 60%, according to sequence reads) in the mixed community. Hydroxylamine and nitrite oxidation were electroactive processes, reinforcing the role of the anodic electrode as the electron acceptor for ammonium oxidation. Taking it all together, ammonium can be removed in BES by a combination of different bio/electrochemical processes. A deeper understanding on how the different metabolisms are coupled together is required for increasing the current ammonium removal rates This work was funded through the European Union's Horizon 2020      project ELECTRA [no. 826244]. M. O-A. was supported by a grant from      University of Girona (IFUdG2018/50). S.P is a Serra H\u00fanter Fellow      (UdG-AG-575) and acknowledges the funding from the ICREA Academia      award. LEQUiA [2017-SGR-1552] and Ecoaqua [2017SGR- 548] have      been recognized as consolidated research groups by the Catalan      Governmen Open Access funding provided thanks to the CRUE-CSIC agreement with Elsevier", "keywords": ["Sewage -- Purification -- Nitrogen removal", "0301 basic medicine", "Bioelectrochemistry", "0303 health sciences", "03 medical and health sciences", "Aig\u00fces residuals -- Depuraci\u00f3 -- Desnitrificaci\u00f3", "13. Climate action", "Bioremediaci\u00f3", "Bioremediation", "6. Clean water", "Bioelectroqu\u00edmica"]}, "links": [{"href": "https://doi.org/10.1016/j.biteb.2022.100975"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Bioresource%20Technology%20Reports", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.biteb.2022.100975", "name": "item", "description": "10.1016/j.biteb.2022.100975", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.biteb.2022.100975"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-02-01T00:00:00Z"}}, {"id": "10.1016/j.cej.2022.138949", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-23T16:15:45Z", "type": "Journal Article", "created": "2022-09-01", "title": "Electrifying secondary settlers to enhance nitrogen and pathogens removals", "description": "Economic options to retrofit wastewater treatment plants (WWTPs) without tertiary treatments need to be explored. In this regard, bioelectrochemical systems (BES) can be hybridized with existing technologies, upgrading the removal performance of original techniques while avoiding replacement costs. Yet, few demonstrations of merged systems have been given. For the first time, in this work it was built a lab-scale model of a BES merged with a secondary settler, namely e-settler, to enhance the polishing performance of already existing WWTPs. In particular, to concomitantly increase nitrogen removal and perform wastewater (WW) disinfection, avoiding further tertiary treatments. In the e-settlers, nitrogen removal was increased through bioelectrochemical stimulation. Concomitant ammonium and nitrate removal without nitrite accumulation and a negligible amount of nitrous oxide emissions were observed. Ti-MMO as anode material showed a high disinfectant action. In conclusion, it was demonstrated how a simple bioelectrochemical set-up can upgrade existing WWTPs. The following step requires the study at a larger scale, identifying optimal operational and structural parameters for the in-situ application. The main limitations of the e-settlers were discussed, linking them to possible solutions that need to be deepened in a lab-scale model of conventional secondary treatments (activated sludge followed by secondary settler) This work was funded through: the ELECTRA project [grant agreement no. 826244], which was financially supported by the Horizon 2020 programme of the European Union; the NSFC-EU Environmental Biotechnology joint program (No. 31861133001); the Key Research and Development Project of Shandong Province (No. 2020CXGC011202). S.P is a Serra H\u00fanter Fellow (UdG-AG-575) and acknowledges the funding from the ICREA Academia award. LEQUiA [2017-SGR-1552] has been recognized as consolidated research group by the Catalan Government Open Access funding provided thanks to the CRUE-CSIC agreement with Elsevier", "keywords": ["Sewage -- Purification -- Nitrogen removal", "Bioelectrochemical system; Wastewater; Ammonium; Nitrate; Secondary treatments; Disinfection", "Aig\u00fces residuals -- Plantes de tractament", "Aig\u00fces residuals -- Depuraci\u00f3 -- Desnitrificaci\u00f3", "13. Climate action", "11. Sustainability", "0207 environmental engineering", "02 engineering and technology", "Sewage disposal plants", "01 natural sciences", "6. Clean water", "12. 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