Publikation:
Quantification and isotherm modelling of competitive phosphate and silicate adsorption onto micro-sized granular ferric hydroxide

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dc.contributor.authorHilbrandt, Inga
dc.contributor.authorLehmann, Vito
dc.contributor.authorZietzschmann, Frederik
dc.contributor.authorRuhl, Aki Sebastian
dc.date.accessioned2024-06-16T14:37:38Z
dc.date.available2024-06-16T14:37:38Z
dc.date.issued2019
dc.description.abstractAdsorption onto ferric hydroxide is a known method to reach very low residual phosphate concentrations. Silicate is omnipresent in surface and industrial waters and reduces the adsorption capacity of ferric hydroxides. The present article focusses on the influences of silicate concentration and contact time on the adsorption of phosphate to a micro-sized iron hydroxide adsorbent (nGFH) and fits adsorption data to multi-component adsorption isotherms. In Berlin drinking water (DOC of approx. 4 mg L-1) at pH 7.0, loadings of 24 mg g-1 P (with 3 mg L-1 initial PO43--P) and 17 mg L-1 Si (with 9 mg L-1 initial Si) were reached. In deionized water, phosphate shows a high percentage of reversible bonds to nGFH while silicate adsorption is not reversible probably due to polymerization. Depending on the initial silicate concentration, phosphate loadings are reduced by 27, 33 and 47% (for equilibrium concentrations of 1.5 mg L-1) for 9, 14 and 22 mg L-1 Si respectively. Out of eight tested multi-component adsorption models, the Extended Freundlich Model Isotherm (EFMI) describes the simultaneous adsorption of phosphate and silicate best. Thus, providing the means to predict and control phosphate removal. Longer contact times of the adsorbent with silicate prior to addition of phosphate reduce phosphate adsorption significantly. Compared to 7 days of contact with silicate (c0 = 10 mg L-1) prior to phosphate (c0 = 3 mg L-1) addition, 28 and 56 days reduce the nGFH capacity for phosphate by 21 and 43%, respectively. Quelle: https://pubs.rsc.orgen
dc.format.extent1 Onlineressource (Seiten 23642-23651)
dc.format.mediumonline resource
dc.identifier.doihttps://doi.org/10.60810/openumwelt-1147
dc.identifier.urihttps://openumwelt.de/handle/123456789/5125
dc.language.isoeng
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.titleQuantification and isotherm modelling of competitive phosphate and silicate adsorption onto micro-sized granular ferric hydroxide
dc.typeWissenschaftlicher Artikel
dc.type.dcmitext
dc.type.mediumcomputer
dspace.entity.typePublication
local.bibliographicCitation.journalTitleRSC Advances
local.bibliographicCitation.originalDOI10.1039/C9RA04865K
local.bibliographicCitation.volume9 (2019), Heft 45
local.collectionAufsätze
local.contributor.authorId02181689
local.contributor.authorId02182723
local.contributor.authorId02180854
local.identifier.catalogId02468476
local.ingest.leader04920naa a2200000uu 4500
local.jointTitleQUANTIFICATION AND ISOTHERM MODELLING OF COMPETITIVE PHOSPHATE AND SILICATE ADSORPTION ONTO MICROSIZED GRANULAR FERRIC HYDROXIDE
local.reviewtrue
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relation.isAuthorOfPublication94c1139a-1828-4d1c-bf3e-f6f519e3d4e8
relation.isAuthorOfPublication.latestForDiscovery94c1139a-1828-4d1c-bf3e-f6f519e3d4e8
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