Evaluation of boron uptake by anion exchange resins in tap and geothermal water matrix. (2018)

• Record Type: Journal Article
• Authors: Kalaitzidou, K.; Tzika, A.M.; Simeonidis, K.; Mitrakas, M.
• Is Part Of: Materials today. Volume 5:Number 14(2018)Part 1
• Page Start: 27599
• Page End: 27606
• Publication Date: 2018
• Subjects: Boron removal -- Ion-exchange -- Tap water -- Geothermal water; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2018.09.080
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: The efficiency of commercial basic anion exchange resins (Amberlite IRA743, Purolite S108, Purolite A200, Dowex 1x8) in the removal of boron from natural water samples was evaluated under typical conditions of water treatment. Batch ion exchange experiments using distilled water spiked with 5 mg B/L at pH 7, indicated that weakly basic N-methylglucamine functionalized resins (Amberlite IRA743, Purolite S108) were able to reduce boron concentration below 1 mg/L, whereas strong base quaternary ammonium resins (Purolite A200, Dowex 1x8) were found completely ineffective to capture boron. The study of pH dependence of uptake efficiency suggests an optimum range of pH 4-9 for both Amberlite IRA743 and Purolite S108. The ion-exchange capacity for both resins was estimated by ion exchange column experiments to be around 3.5 mg B/g for residual concentration 1 mg B/L in tap and geothermal water matrix. Regeneration of the columns was achieved by acid washing followed by stabilization of the resin using NaOH, NaHCO3 and mixed NaHCO3 /Na2 SO4 solutions. Enhancement of ion exchange capacity was observed after the stabilization by NaHCO3 /Na2 SO4 solution. The efficiency of Purolite S108 resin was maintained for at least 4 ion exchange cycles without significant losses. Furthermore, in case of geothermal water from Anthemounta basin, which does not contain NO3 -, the stabilization by the mixed 20 g/L NaHCO3 / Na2 SO4 solution optimized selectivity to boron and improved uptake capacity to 4.3 mg/g at breakthrough concentration 1 mg/L.