Membrane-assisted reactive crystallisation for the recovery of dissolved phosphorus in vivianite form from liquid effluents

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dc.contributor.authorJiménez-Robles, R.
dc.contributor.authorMartínez-Soria, V.
dc.contributor.authorIzquierdo Sanchis, M.
dc.contributor.authorChen, Lo-I
dc.contributor.authorLe Corre Pidou, Kristell
dc.contributor.authorMcAdam, Ewan
dc.date.accessioned2023-08-23T14:35:10Z
dc.date.available2023-08-23T14:35:10Z
dc.date.issued2023-08-21
dc.description.abstractNovel membrane crystallisation processes resolve the mixing challenge on conventional crystallisers, by providing fixed interfacial area over which supersaturation is controlled for nucleation. Moreover, the membrane surface is thought to reduce interfacial energy and encourage micromixing. In this regard, a novel membraneassisted reactive crystallisation (MARC) process was used in this work for the dissolved phosphorous recovery in form of vivianite crystals from a phosphate-rich solution by means of the dosing of iron (II). To characterise the role of the boundary layer in controlling nucleation, a batch lab-scale system was used for the crystallization tests, and different hydraulic conditions (Reynolds ranging from 105 to 395) and polymeric membranes were tested. The crystallisation process was influenced by the hydraulic conditions, in which a low liquid velocity led to a lower induction time and vivianite supersaturation, and therefore, higher nucleation rates. Membrane properties were characterised to establish their role in the modification of the critical free energy requirement for nucleation, and for the promotion of micromixing, as possible factors that can be used to modify nucleation kinetics. As result, the bulk induction time tended to decrease with the increase in membrane hydrophobicity, roughness, pore size and porosity. Spherical vivianite nanoparticles were always synthesised with a mean size around 35 nm and a narrow distribution independently of the hydraulic conditions and membrane used. Finally, the crystallisation kinetic conformed to a diffusion-dependent nucleation mechanism, in which higher residence times for mixing increased the ion collision probability for nucleation. Importantly, this study demonstrated that MARC is an attractive prospect for nutrient recovery from wastewaters where crystal nucleation can be easily controlled by setting the operational conditions and membrane properties, eliciting considerable process intensification over existing conventional crystalliser.en_UK
dc.description.sponsorshipEuropean Union funding: 714080en_UK
dc.identifier.citationJiménez-Robles R, Martínez-Soria V, Izquierdo Sanchis M, et al., (2023) Membrane-assisted reactive crystallisation for the recovery of dissolved phosphorus in vivianite form from liquid effluents, Separation and Purification Technology, Volume 326, December 2023, Article Number 124712en_UK
dc.identifier.eissn1873-3794
dc.identifier.issn1383-5866
dc.identifier.urihttps://doi.org/10.1016/j.seppur.2023.124712
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/20136
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectMembrane-assisted crystallisationen_UK
dc.subjectnanoparticlesen_UK
dc.subjectnucleation kineticen_UK
dc.subjectphosphorus recoveryen_UK
dc.subjectpolymeric membraneen_UK
dc.subjectvivianiteen_UK
dc.titleMembrane-assisted reactive crystallisation for the recovery of dissolved phosphorus in vivianite form from liquid effluentsen_UK
dc.typeArticleen_UK

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