On-line mini-column flow injection electrochemical method for researching on resuscitation and dehydration performance of deeply-fouled cation-exchange resins
Li Yong-Sheng, Li Qiao-Jing, Huang Bo, Gao Xiu-Feng
For rapidly and accurately obtaining the performance parameters of ion-exchange resins, an especial online column flow-injection electrochemical method and system (FIA-ECM) was designed. In the research, the waste strong acid type cation-exchange resin (WSCR) was used as test sample, which was again immersed in the saturated ferric trichloride solution and lubricant oil for long time and heated at 110°C to further deteriorate its ion-exchange performance. And then, the orthogonal and the single factor experiments on WSCR were conducted by using the FIA-ECM system. Under optimized conditions, the resuscitation rate of WSCR reached to 90% which can reuse in industry for various water treatments. Besides, a new conclusion was also obtained by using the FIA-ECM system, namely, exchange capacity of SCR being in drying state is higher than that in wetting state, and new SCR can be transported and saved in drying state, thus can notably reduce transport costs. The conclusion has very important significance in water treatment industry using resins. Merits of FIA-ECM were higher in automation extent, lower in reagent consumption in the test, inexistent in personal errors, and conducive to environmental protection. It can be extended to automatically and rapidly determine performances of various resins or new developed materials with cation-ion exchange capacity and screening of various revitalizers for resins.