Characteristics and mechanisms of phosphate adsorption on dewatered alum sludge

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dc.contributor.authorYang, Y.-
dc.contributor.authorZhao, Y.Q.-
dc.contributor.authorBabatunde, A.O.-
dc.contributor.authorWang, L.-
dc.contributor.authorRen, Y.X.-
dc.contributor.authorHan, Y.- Elsevier B.V.en
dc.identifier.citationSeparation and Purification Technologyen
dc.description.abstractThe adsorption characteristics of phosphate adsorption on the dewatered alum sludge were identified as a function of pH and ion strengths in solution. In addition, adsorption mechanisms were investigated by conducting batch tests on both the hydrolysis and P-adsorption process of the alum sludge, and making a comparative analysis to gain newer insights into understanding the adsorption process. Results show that the adsorption capacity decreased from 3.5 to 0.7 mg-P/g-sludge when the solution pH was increased from 4.3 to 9.0, indicating that adsorption capacity is largely dependent upon the pH of the system. The results of the competitive adsorption between phosphate and typical anions found in wastewater, such as SO42- and Cl-, onto alum sludge reveal that alum sludge can selectively adsorb phosphate ions. The insignificant effect of SO42- and Cl- on P-adsorption capacity indicates that phosphate adsorption is through a kind of inner-sphere complex reaction. During the adsorption process, the decrease of phosphate concentration in solution accompanied with an increase in pH values and concentrations of SO42-, Cl- and TOC (total organic carbon) suggests that phosphate replaced the functional groups from the surface of alum sludge which infers that ligand exchange is the dominating mechanism for phosphate removal. At the same time, the simultaneous decreases in PO43- and total aluminium concentration in solution indicate that chemical reaction and precipitation are other mechanisms of phosphate removal.en
dc.description.sponsorshipOther funderen
dc.format.extent408411 bytes-
dc.relation.requiresArchitecture, Landscape & Civil Engineering Research Collectionen
dc.relation.requiresCritical Infrastructure Group Research Collectionen
dc.relation.requiresUrban Institute Ireland Research Collectionen
dc.rightsThis is the author’s version of a work that was accepted for publication in Separation and Purification Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Separation and Purification Technology, 51 (2): 193-200 DOI 10.1016/j.seppur.2006.01.013.en
dc.subjectAdsorption mechanismsen
dc.subjectAlum sludgeen
dc.subjectLigand exchangeen
dc.subjectPhosphate removalen
dc.subjectSurface complexen
dc.subject.lcshPhosphates--Absorption and adsorptionen
dc.subject.lcshWater treatment plant residualsen
dc.subject.lcshWater--Purification--Phosphate removalen
dc.subject.lcshLigand exchange chromatographyen
dc.titleCharacteristics and mechanisms of phosphate adsorption on dewatered alum sludgeen
dc.typeJournal Articleen
dc.internal.availabilityFull text availableen
dc.statusPeer revieweden
dc.description.othersponsorshipEnvironmental Protection Agencyen
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Appears in Collections:Centre for Water Resources Research Collection
Urban Institute Ireland Research Collection
Critical Infrastructure Group Research Collection
Civil Engineering Research Collection
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