{"type": "FeatureCollection", "features": [{"id": "10.1016/j.envpol.2021.117927", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-22T16:15:49Z", "type": "Journal Article", "created": "2021-08-07", "title": "Groundwater antibiotic pollution and its relationship with dissolved organic matter: Identification and environmental implications", "description": "The occurrence of veterinary antibiotics and hydro-chemical parameters in eleven natural springs in a livestock production area is evaluated, jointly with the characterization of their DOM fingerprint by Orbitrap HRMS. Tetracycline and sulfonamide antibiotics were ubiquitous in all sites, and they were detected at low ng L-1 concentrations, except for doxycycline, that was present at \u03bcg L-1 in one location. DOM analysis revealed that most molecular formulas were CHO compounds (49 %-68\u00a0%), with a remarkable percentage containing nitrogen and sulphur (16 %-23\u00a0% and 11 %-24\u00a0%, respectively). Major DOM components were phenolic and highly unsaturated compounds (~90\u00a0%), typical for soil-derived organic matter, while approximately 11\u00a0% were unsaturated aliphatic, suggesting that springs may be susceptible to anthropogenic contamination sources. Comparing the DOM fingerprint among sites, the spring showing the most different profile was the one with surface water interaction and characterized by having lower CHO and higher CHOS formulas and aliphatic compounds. Correlations between antibiotics and DOM showed that tetracyclines positively correlate with unsaturated oxygen-rich substances, while sulfonamides relate with aliphatic and unsaturated oxygen-poor compounds. 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Electrochemical water softening as pretreatment for nitrate electro bioremediation. Sci. Total Environ. 806, 150433. https://doi.org/10.1016/J.SCITOTENV.2021.150433'.", "keywords": ["Nitrate-contaminated groundwater; Hardness removal; Denitrifying bioelectrochemical system; Polarity reversal", "Nitrates", "02 engineering and technology", "Bioremediaci\u00f3", "01 natural sciences", "6. Clean water", "12. 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Sustainable and resilient technologies are required for their treatment. The present study aims to evaluate microbial electrochemical technologies (METs) for treating groundwater contaminated with nitrate (NO3-) while containing arsenic (in form of arsenite (As(III)) as a co-contaminant. The treatment was based on the combination of nitrate reduction to dinitrogen gas and arsenite oxidation to arsenate (exhibiting less toxicity, solubility, and mobility), which can be removed more easily in further post-treatment. We operated a bioelectrochemical reactor at continuous-flow mode with synthetic contaminated groundwater (33 mg N-NO3- L-1 and 5 mg As(III) L-1) identifying the key operational conditions. Different hydraulic retention times (HRT) were evaluated, reaching a maximum nitrate reduction rate of 519 g N-NO3- m3Net Cathodic Compartment d-1 at HRT of 2.3 h with a cathodic coulombic efficiency of around 100 %. Simultaneously, arsenic oxidation was complete at all HRT tested down to 1.6 h reaching an oxidation rate of up to 90 g As(III) m-3Net Reactor Volume d -1. Electrochemical and microbiological characterization of single granules suggested that arsenite at 5 mg L-1 did not have an inhibitory effect on a denitrifying biocathode mainly represented by Sideroxydans sp. Although the coexistence of abiotic and biotic arsenic oxidation pathways was shown to be likely, microbial arsenite oxidation linked to denitrification by Achromobacter sp. was the most probable pathway. This research paves the ground towards a real application for treating groundwater with widespread pollutants.", "keywords": ["Nitrates", "Arsenites", "0211 other engineering and technologies", "02 engineering and technology", "Bioremediaci\u00f3", "01 natural sciences", "6. Clean water", "Arsenic", "12. Responsible consumption", "Bioelectrochemistry", "Biodegradation", " Environmental", "13. 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