title: Integrated bicarbonate-form ion exchange treatment and regeneration for DOC removal: Model development and pilot plant study.
abstract: The application of bicarbonate-form anion exchange resin and sodium bicarbonate salt for resin regeneration was investigated in this research is to reduce chloride ion release during treatment and the disposal burden of sodium chloride regeneration solution when using traditional chloride-form ion exchange (IX). The target contaminant in this research was dissolved organic carbon (DOC). The performance evaluation was conducted in a completely mixed flow reactor (CMFR) IX configuration. A process model that integrated treatment and regeneration was investigated based on the characteristics of configuration. The kinetic and equilibrium experiments were performed to obtain required parameters for the process model. The pilot plant tests were conducted to validate the model as well as provide practical understanding on operation. The DOC concentration predicted by the process model responded to the change of salt concentration in the solution, and showed a good agreement with pilot plant data with less than 10% difference in terms of percentage removal. Both model predictions and pilot plant tests showed over 60% DOC removal by bicarbonate-form resin for treatment and sodium bicarbonate for regeneration, which was comparable to chloride-form resin for treatment and sodium chloride for regeneration. Lastly, the DOC removal was improved by using higher salt concentration for regeneration.
authors.affiliation: Department of Environmental Engineering Sciences, Engineering School of Sustainable Infrastructure & Environment (ESSIE), University of Florida, P.O. Box 116450, Gainesville, FL 32611-6450, USA. Electronic address: yuehu2013@ufl.edu.
authors.forename: Yue
authors.initials: Y
authors.lastname: Hu
authors.affiliation: School of Sustainable Engineering and The Built Environment (SSEBE), Arizona State University, P.O. Box 873005, Tempe, AZ, 85287-3005, USA. Electronic address: thboyer@asu.edu.
authors.forename: Treavor H
authors.initials: TH
authors.lastname: Boyer
mesh_terms: D001639:Bicarbonates; D007474:Ion Exchange; D012038:Regeneration; D014874:Water Pollutants, Chemical; D018508:Water Purification
chemical_list: D001639:Bicarbonates; D014874:Water Pollutants, Chemical
keywords: Bicarbonate; Completely mixed flow reactor (CMFR); Dissolved organic carbon (DOC); Drinking water treatment; Magnetic ion exchange (MIEX)