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dc.contributor.authorHermassi, Mehrez
dc.contributor.authorValderrama Angel, César Alberto
dc.contributor.authorMoreno Palmerola, Natalia
dc.contributor.authorFont Piqueras, Oriol
dc.contributor.authorQuerol Carceller, Xavier
dc.contributor.authorBatis, Narjes
dc.contributor.authorCortina Pallás, José Luís
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Química
dc.identifier.citationHermassi, M., Valderrama, C., Moreno, N., Font, O., Querol , X., Batis, N., Cortina, J. Fly ash as reactive sorbent for phosphate removal from treated waste water as a potential slow release fertilizer. "Journal of Environmental Chemical Engineering", 1 Febrer 2017, vol. 5, núm. 1, p. 160-169.
dc.description.abstractThere is interest in recovering phosphate (P(V)) from secondary sources, such as waste water streams for potential use as fertilizers reducing the environmental impacts of P(V) discharges and providing alternative phosphorus sources. The goal of this work was to provide an understanding of P(V) removal by fly ash (FA) from coal power plants. Phosphate removal using Ca(II) rich FA was evaluated in terms of i) sorption equilibrium, ii) sorption kinetics under the expected pH values and P(V) concentrations in wastewaters effluents, and iii) P(V) availability of the FAs in agricultural applications. At the pH values (6–9) expected for wastewater effluents, P(V) removal proceeds as a combination of CaO(s) dissolution and brushite (CaHPO4(s)) formation on the FA particles. This process avoids the formation of relatively insoluble Ca–phosphates, such as, hydroxyapatite (Hap) with limited fertilizing properties. High P-loadings were achieved (up to 50 mgP-PO4/g FA (5% P(V) by weight)) at a pH of 8. The removal kinetics data were well described as a diffusion-based process of phosphate ions (H2PO4- and HPO42-) on FA particles, and the CaO(s) dissolution process was discarded as the rate controlling step. The P(V) availability from loaded samples was determined via an agronomical assay with NaHCO3 solutions with P(V) release ratios of 10–30 mgP-PO4/g in FA, confirming the appropriateness of this material as a potential fertilizer, even in calcareous soils.
dc.format.extent10 p.
dc.subjectÀrees temàtiques de la UPC::Enginyeria química::Química del medi ambient
dc.subject.lcshChemical processes
dc.subject.otherPhosphate recovery
dc.subject.otherFly ash
dc.subject.otherSlow release fertilizer
dc.titleFly ash as reactive sorbent for phosphate removal from treated waste water as a potential slow release fertilizer
dc.subject.lemacAigües residuals
dc.subject.lemacAigües residuals -- Depuració
dc.subject.lemacFosfats -- Absorció i adsorció
dc.subject.lemacProcessos químics
dc.contributor.groupUniversitat Politècnica de Catalunya. SETRI - Grup de Tècniques de Separació i Tractament de Residus Industrials
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (author's final draft)
local.citation.authorHermassi, M.; Valderrama, C.; Moreno, N.; Font, O.; Querol, X.; Batis, N.; Cortina, J.
local.citation.publicationNameJournal of Environmental Chemical Engineering

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