Ammonium concentration in stream sediments resulting from decades of discharge from a wastewater treatment plant
Entity
UAM. Departamento de Geología y GeoquímicaPublisher
ElsevierDate
2023-11-01Citation
10.1016/j.heliyon.2023.e21860
Heliyon 9.11 (2023): e21860
ISSN
2405-8440 (online)DOI
10.1016/j.heliyon.2023.e21860Subjects
ammonium; clay sediment; Geo-indicator; wastewater; WWTP; GeologíaRights
© 2023 The AuthorsEsta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Abstract
A study of ammonium pollution in the sediments of a stream that receives wastewater treatment plant (WWTP) discharge has been carried out. It is urgently necessary to find environmental indicators that can help prevent and detect potential contamination of water, as water is an increasingly scarce resource. To understand the behaviour of ammonium ions introduced by a historical (50-year) contamination process, vertical boreholes were drilled in the stream banks to depths between 30 and 120 cm. Moisture, pH, ammonium (soluble and exchangeable), and clay fraction content were analysed. The variation profile of these parameters was evaluated as a function of depth to determine factors related to the distribution of ammonium in several locations along the stream banks. The ammonium concentration was asymmetrically distributed among samples collected in near-surface locations, with ammonium concentrations between 0.3048 mmol/kg soil and 0.0007 mmol/kg soil. Ammonium was typically concentrated at sediment depths of 30–40 cm, which also exhibited the highest clay fraction content. High positive correlations were detected (r > 0.8; p < 0.0001) among the different ammonium variables (exchanged and dissolved species). No contamination effect was observed below 60–70 cm depth, which was due to ammonium retention in a natural barrier layer of clayey sediment. The clays in our study area (previously identified as smectite, a 2:1 sheet silicate) were able to control the contamination by retaining ammonium in the interlayers, which retarded nitrification. It is suggested that clay could serve as a geo-indicator of ammonium pollution evolution
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Google Scholar:Martín, María Tijero
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Valdepeñas Polo, Lucía
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González Yélamos, Javier
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Cuevas Rodríguez, Jaime Fernando
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