Document Type : VSI: Honoring MB
Department of Process Engineering and Technology of Polymeric and Carbon Materials, Faculty of Chemistry, Wroclaw University of Science and Technology
Wroclaw University of Science and Technology
Chemical Engineering Department, Ege University
Chemical Engineering Department, Faculty of Engineering Bornova, Ege University
Management of the concentrated brine with high ion concentrations after reverse osmosis (RO) filtration of geothermal water is a serious environmental problem. In addition to the concentrated brine, the RO permeate of geothermal water is also problematic in terms of boron concentration as it is usually above the permissible limit value stated by WHO for drinking and irrigation water. In our present work, the RO process was integrated with hybrid method combining adsorption with ultrafiltration to remove boron from the geothermal water RO permeate (GW-ROP) while boron and arsenic removals from the geothermal re-injection water RO concentrate (GRIW-ROC). In this sense, novel chelating resins such as novel N-methyl-D-glucamine (NMDG) based resins (1JW and 2JW) along with boron selective core-shell based chelating resin (2PTN) were employed. According to the data obtained, the 2JW resin achieved 81.7% and 95.8% of boron removals from GW-ROP and GRIW-ROC solutions, respectively. The 2JW resin achieved a good success in the removal of boron compared with commercial Dowex XUS 43594.00 resin. In case of arsenic removal from GRIW-ROC, the 2JW resin showed a better performance than Dowex XUS 43594.00 resin at the same resin concentration. Boron removals from the GW-ROP were 72.0% with 1JW resin and 65.8% with 2PTN resin by achieving the permissible boron level set for drinking water. On the other hand, 2PTN resin could not reduce the boron concentration in the GRIW-ROC below the permissible values.