基于串联离子交换树脂在糖浆脱色脱盐中的应用及脱盐再生液回用的可行性研究OA

This study aimed to enhance the decolorization and desalination efficiency of clarified juice syrup by optimizing the configuration of series-connected ion exchange resins and to investigate the feasibility of reusing nanofiltration-treated desalination regenerant for resin regeneration,thereby promoting resource recovery and reducing effluent discharge.The research initially screened anion(LX-958 hydroxide-type)and cation(LX-150 hydrogen-type)exchange resins at different ratios,identifying an optimal desalination ratio of 2.5︰1.Subsequently,various series configurations were constructed and evaluated through dynamic adsorption experiments for their treatment capacity.The"LX-975 chloride-type+LX-975 hydroxide-type+LX-958 hydroxide-type+LX-150 hydrogen-type"anion-anion-anion-cation series configuration was selected as the core process.For the acidic and alkaline waste generated from desalination resin regeneration,nanofiltration technology was employed.The obtained permeate,after supplementation with appropriate amounts of acid or alkali,was used as the recycled regenerant.A systematic comparison was conducted between conventional regeneration and recycled-regenerant regeneration regarding resin desalination performance,operational stability over multiple cycles,and changes in regenerant composition to evaluate the integrated process.The results demonstrated that the identified anion-anion-anion-cation series configuration exhibited optimal decolorization and desalination capabilities,achieving a single-run syrup treatment volume of 22 000 mL.This configuration maintained stable performance through five regeneration cycles.More importantly,resins regenerated with the recycled regenerant showed significantly superior desalination performance compared to those regenerated with fresh conventional regenerant.Over ten operational cycles,the average treatment capacity for the former(67 BV)was higher than that of the latter(60 BV).The anion-anion-anion-cation series ion exchange resin configuration can be efficiently applied for syrup decolorization and desalination,and the nanofiltration-based regenerant reuse technology is viable.This approach not only improves resin desalination efficiency but also enables the recycling of waste regenerant,providing an effective technical reference for sugar refineries to reduce wastewater treatment load and operational costs.