{"type": "FeatureCollection", "features": [{"id": "10.1016/j.cej.2022.138949", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-25T16:15:59Z", "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. Responsible consumption", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://cris.unibo.it/bitstream/11585/897560/1/Botti%20et%20al_Chemical%20Engineering%20Journal_2023_451-138949.pdf"}, {"href": "https://doi.org/10.1016/j.cej.2022.138949"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Chemical%20Engineering%20Journal", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.cej.2022.138949", "name": "item", "description": "10.1016/j.cej.2022.138949", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.cej.2022.138949"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2023-01-01T00:00:00Z"}}, {"id": "10.1007/s10705-007-9098-2", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-25T16:15:06Z", "type": "Journal Article", "created": "2007-04-05", "title": "Reduced Nitrate Concentrations In Shallow Ground Water Under A Non-Fertilised Grass Buffer Strip", "description": "In this paper the suitability of a buffer strip to reduce nitrate concentrations in the upper groundwater was tested for a sandy arable soil in The Netherlands during two consecutive leaching seasons. The bufferstrip was a 3.5\u00a0m wide unfertilised grass strip adjacent to a ditch on an arable field. In total 24 groundwater wells were installed in 4 transects perpendicular to the ditch to determine Cl, NO3 and \u03b415N concentrations. Piezometers were installed to assess the groundwater flow, which was in the direction of the ditch with small downward leakage across a peat layer at about 3\u00a0m depth. Nitrogen was dominantly present as nitrate (NO3). The NO3-N concentrations under the bufferstrip were significantly lower than under the adjacent arable field. The lower concentrations were due to dilution, uptake by grass and denitrification. Nitrate was actively removed in the bufferstrip, since the Cl/NO3 ratios were higher in the bufferstrip than in the remainder of the field. Furthermore, \u03b415N data indicated that denitrification occurred in the groundwater and increased with decreasing distance to the ditch. NO3-N loads to the ditch were estimated at 8.5\u00a0kg\u00a0ha\u22121yr\u22121, which is relatively low for this area. We can, however, not determine whether these relatively low NO3-N loads were causally related to the reduced NO3-N concentrations in the bufferstrip. Nevertheless, the results of the present study are promising and justify additional research on the efficiency of bufferstrips to reduce NO3 concentrations in shallow groundwater, and subsequently reduce NO3 loading of surface water, under Dutch conditions.", "keywords": ["coastal-plain", "Soil Science", "netherlands", "dynamics", "04 agricultural and veterinary sciences", "01 natural sciences", "6. Clean water", "riparian zone", "surface waters", "nitrogen removal", "quality", "sandy soil", "0401 agriculture", " forestry", " and fisheries", "movement", "Agronomy and Crop Science", "agriculture", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1007/s10705-007-9098-2"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Nutrient%20Cycling%20in%20Agroecosystems", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s10705-007-9098-2", "name": "item", "description": "10.1007/s10705-007-9098-2", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s10705-007-9098-2"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2007-04-06T00:00:00Z"}}, {"id": "10.1016/j.biteb.2022.100975", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-25T16:15:56Z", "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.ese.2020.100013", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-25T16:16:16Z", "type": "Journal Article", "created": "2020-01-13", "title": "Microbial electrochemistry for bioremediation", "description": "Lack of suitable electron donors or acceptors is in many cases the key reason for pollutants to persist in the environment. Externally supplementation of electron donors or acceptors is often difficult to control and/or involves chemical additions with limited lifespan, residue formation or other adverse side effects. Microbial electrochemistry has evolved very fast in the past years - this field relates to the study of electrochemical interactions between microorganisms and solid-state electron donors or acceptors. Current can be supplied in such so-called bioelectrochemical systems (BESs) at low voltage to provide or extract electrons in a very precise manner. A plethora of metabolisms can be linked to electrical current now, from metals reductions to denitrification and dechlorination. In this perspective, we provide an overview of the emerging applications of BES and derived technologies towards the bioremediation field and outline how this approach can be game changing.", "keywords": ["0301 basic medicine", "AUTOTROPHIC DENITRIFICATION", "elecetrobioremediation", "Bioremediaci\u00f3", "FUEL-CELLS", "Environmental technology. Sanitary engineering", "Microbial biotechnology", "01 natural sciences", "POLYCYCLIC AROMATIC-HYDROCARBONS", "03 medical and health sciences", "WASTE-WATER", "DECHLORINATION", "TD Environmental technology. Sanitary engineering", "Electrochemistry", "POLLUTANTS", "GE1-350", "TD1-1066", "0105 earth and related environmental sciences", "NITRATE-CONTAMINATED GROUNDWATER", "ENVIRONMENTAL REMEDIATION", "Q Science (General)", "QR Microbiology", "NITROGEN REMOVAL", "6. Clean water", "Environmental sciences", "Electroqu\u00edmica", "ORGANIC", "BIOELECTROCHEMICAL SYSTEMS", "13. Climate action", "Earth and Environmental Sciences", "Perspective", "Biotecnologia microbiana", "Bioremediation"]}, "links": [{"href": "https://iris.cnr.it/bitstream/20.500.14243/540323/1/1-s2.0-S2666498420300053-main.pdf"}, {"href": "https://doi.org/10.1016/j.ese.2020.100013"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Environmental%20Science%20and%20Ecotechnology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.ese.2020.100013", "name": "item", "description": "10.1016/j.ese.2020.100013", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.ese.2020.100013"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2020-01-01T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=NITROGEN+REMOVAL&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=NITROGEN+REMOVAL&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=NITROGEN+REMOVAL&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=NITROGEN+REMOVAL&offset=4", "hreflang": "en-US"}], "numberMatched": 4, "numberReturned": 4, "distributedFeatures": [], "timeStamp": "2026-07-26T04:10:13.316694Z"}