Tracking the formation potential of vivianite within the treatment train of full-scale wastewater treatment plants
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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11
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Science of the Total Environment, Volume 912
Abstract
Phosphorus recovery is a vital element for the circular economy. Wastewater, especially sewage sludge, shows great potential for recovering phosphate in the form of vivianite. This work focuses on studying the iron, phosphorus, and sulfur interactions at full-scale wastewater treatment plants (Viikinmäki, Finland and Seine Aval, France) with the goal of identifying unit processes with a potential for vivianite formation. Concentrations of iron(III) and iron(II), phosphorus, and sulfur were used to evaluate the reduction of iron and the formation potential of vivianite. Mössbauer spectroscopy and X-ray diffraction (XRD) analysis were used to confirm the presence of vivianite in various locations on sludge lines. The results show that the vivianite formation potential increases as the molar Fe:P ratio increases, the anaerobic sludge retention time increases, and the sulfate concentration decreases. The digester is a prominent location for vivianite recovery, but not the only one. This work gives valuable insights into the dynamic interrelations of iron, phosphorus, and sulfur in full-scale conditions. These results will support the understanding of vivianite formation and pave the way for an alternative solution for vivianite recovery for example in plants that do not have an anaerobic digester.Description
Funding Information: The authors would like to thank Aino Peltola for assisting with laboratory analysis in Finland, and Jennifer Mas for assisting during sampling campaigns in France. The research was funded by Helsingin seudun ympäristöpalvelut (HSY), Maa-ja vesitekniikan tuki ry (MVTT), and by Syndicat interdépartemental pour l'assainissement de l'agglomération parisienne (SIAAP) in the framework of MOCOPEE program. Publisher Copyright: © 2023 The Authors
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Amin, L, Al-Juboori, R A, Lindroos, F, Bounouba, M, Blomberg, K, Viveros, M L, Graan, M, Azimi, S, Lindén, J, Mikola, A & Spérandio, M 2024, 'Tracking the formation potential of vivianite within the treatment train of full-scale wastewater treatment plants', Science of the Total Environment, vol. 912, 169520. https://doi.org/10.1016/j.scitotenv.2023.169520