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dc.contributor.authorPolat, Hürriyet
dc.contributor.authorVengosh, Avner
dc.contributor.authorPankratov, Irena
dc.contributor.authorPolat, Mehmet
dc.date.accessioned2016-06-13T11:52:43Z
dc.date.available2016-06-13T11:52:43Z
dc.date.issued2004-04
dc.identifier.citationPolat, H., Vengosh, A., Pankratov, I., and Polat, M. (2004). A new methodology for removal of boron from water by coal and fly ash. Desalination, 164(2), 173-188. doi:10.1016/S0011-9164(04)00176-6en_US
dc.identifier.issn0011-9164
dc.identifier.urihttp://doi.org/10.1016/S0011-9164(04)00176-6
dc.identifier.urihttp://hdl.handle.net/11147/4761
dc.description.abstractHigh levels of boron concentrations in water present a serious problem for domestic and agriculture utilizations. The recent EU drinking water directive defines an upper limit of 1 mgB/I. In addition, most crops are sensitive to boron levels >0.75 mg/1 in irrigation water. The boron problem is magnified by the partial (∼60%) removal of boron in reverse osmosis (RO) desalination due to the poor ionization of boric acid and the accumulation of boron in domestic sewage effluents. Moreover, high levels of boron are found in regional groundwater in some Mediterranean countries, which requires special treatment in order to meet the EU drinking water regulations. Previous attempts to remove boron employed boron-specific ion-exchange resin and several cycles of RO desalination under high pH conditions. Here, we present an alternative methodology for boron removal by using coal and fly ash as adsorbents. We conducted various column and batch experiments that explored the efficiency of boron removal from seawater and desalinated seawater using several types of coal and fly ash materials under controlled conditions (pH, liquid/solid ratio, time of reaction, pre-treatment, regeneration). We examined the effect of these factors on the boron removal capacity and the overall chemical composition of the residual seawater. The results show that the selected coal and fly ash materials are very effective in removing boron such that the rejection ratio of boron can reach 95% of the initial boron content under certain optimal conditions (e.g., pH = 9, L/S = 1/10, reaction time > 6 h). Our experiments demonstrated that use of glycerin enables regeneration of boron uptake into coal, but the boron uptake capacity of fly ash reduces after several cycles of treatment-reaction. The boron removal is associated with Mg depletion and Ca enrichment in the residual seawater and conversely with relative Mg enrichment and Ca depletion in the residual fly ash. We propose that the reaction of Ca-rich fly ash with Mg-rich seawater causes co-precipitation of magnesium hydroxide in which boron is co-precipitated. The new methodology might provide an alternative technique for boron removal in areas where coal and fly ash are abundant.en_US
dc.description.sponsorshipBOROMED EVKl-CT-2000-00046en_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.isversionof10.1016/S0011-9164(04)00176-6en_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectDesalinationen_US
dc.subjectBoronen_US
dc.subjectCoalen_US
dc.subjectFly ashen_US
dc.subjectMg-oxideen_US
dc.subjectReverse osmosisen_US
dc.subjectSeawateren_US
dc.subjectWater treatmenten_US
dc.titleA new methodology for removal of boron from water by coal and fly ashen_US
dc.typearticleen_US
dc.contributor.authorIDTR6387en_US
dc.contributor.authorIDTR20247en_US
dc.contributor.institutionauthorPolat, Hürriyet
dc.contributor.institutionauthorPolat, Mehmet
dc.relation.journalDesalinationen_US
dc.contributor.departmentIzmir Institute of Technology. Chemical Engineeringen_US
dc.contributor.departmentIzmir Institute of Technology. Chemistryen_US
dc.identifier.volume164en_US
dc.identifier.issue2en_US
dc.identifier.startpage173en_US
dc.identifier.endpage188en_US
dc.identifier.wosWOS:000220555100008
dc.identifier.scopusSCOPUS:2-s2.0-1842635199
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US


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