Decomposition of Spent Ion Exchange Resin Using Acid digestion, Fenton and Fenton-like Process

Fenton like oxidation method was used in this research to decompose the cationic and anionic resins. Acid digestion and fenton method was also studied to compare the results. Acid digestion and fenton methods did not show desirable results, so the research was focused on fenton like process. For this purpose the Cu۲+ was used as catalyst and H۲O۲ as oxidant. Five parameter including temperature, pH, Cu۲+ concentration, H۲O۲ addition flow rate and time were studied to obtain the optimum value for decomposition of fresh resin. It was found out that the optimum values was as: temperature:۷۵ C, Cu۲+ concentration:۰.۳ M, H۲O۲ addition flowrate:۰.۵ ml/min for cationic and ۰.۲۵ ml/min for anionic resin and time: ۲ hours. By optimization of the parameters decomposition weight percent of ۸۸% was obtained for cationic resin and ۸۳% for anionic resin. The optimum condition was applied for real sample which was a mix of cationic and anionic resin from Tehran research reactor. The decomposition percent of ۸۱% was achieved. The resins was characterized before and after decomposition by FTIR and SEM which showed the decomposition. COD analysis showed that only ۲% of decomposed resin maintained in the solution and ۹۸% was converted to CO۲ and H۲O.

کلیدواژه ها:

Fenton ، Fenton like ، Acid Digestion ، Decomposition ، Resin