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An innovative two-step methodology for struvite recovery from wastewater with high purity and agronomic potential

2024-11Artigo científico Acesso aberto
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dc.contributor.authorSantos, Andreia F.
dc.contributor.authorAbreu, Raquel L.
dc.contributor.authorAlvarenga, Paula
dc.contributor.authorGando-Ferreira, Licínio M.
dc.contributor.authorQuina, Margarida J.
dc.date.accessioned2025-01-28T14:11:40Z
dc.date.available2025-01-28T14:11:40Z
dc.date.issued2024-11
dc.description.abstractRecovering phosphorus (P) from wastewater is a central strategy for environmental protection and sustainable development, with a contribution to resource scarcity issues. This research aims to fill a gap in the understanding of selective calcium removal prior to struvite precipitation to increase its purity. A previous assessment showed that the stream before anaerobic digestion is the best hot spot for precipitate struvite, as it gathers the following conditions: soluble reactive P (orthophosphates) > 30 mg P/L, Mg/P molar ratio > 1, highest Mg/Ca molar ratio, and lowest Ca/P molar ratio. As expected, calcium had a major influence in the process, with 90 % of P recovered within the first 2.5 min of reaction in its presence. However, the magnesium removal efficiency was reduced to about 30 %, which affected the purity of the product (confirmed by microscopy). Increasing the Mg/Ca molar ratio to minimize the effect of Ca is not beneficial. The removal efficiency of Ca from the solution was not significantly affected by the increase of the molar ratio, despite more Mg removed associated with P. The presence of carbonate ions in the wastewater can reduce the purity of the precipitated solid, as it reacts with Ca. A two-step precipitation alternative was developed relying on pH changes to selectively precipitate Ca in the first step (pH 7), and precipitate Mg with P in the second step (pH 8). The solid obtained after the second step was mostly struvite, with a negligible contribution of Ca, which revealed good availability of P after soil application, measuring its extractability in incubation experiments.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationSantos, Andreia F., et al. “An Innovative Two-Step Methodology for Struvite Recovery from Wastewater with High Purity and Agronomic Potential.” Journal of Water Process Engineering, vol. 67, Nov. 2024, p. 106206.pt_PT
dc.identifier.doi10.1016/j.jwpe.2024.106206pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.5/97849
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionwww.elsevier.com/locate/jwpept_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/pt_PT
dc.subjectphosphoruspt_PT
dc.subjectstruvitept_PT
dc.subjectwastewaterpt_PT
dc.subjectprecipitationpt_PT
dc.subjectsoil extractable phosphorouspt_PT
dc.titleAn innovative two-step methodology for struvite recovery from wastewater with high purity and agronomic potentialpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPage106206pt_PT
oaire.citation.titleJournal of Water Process Engineeringpt_PT
oaire.citation.volume67pt_PT
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT

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