The Fgd Electrodialysis Regeneration Film

One type of cation exchange membranes was made for the purpuse of electrodialysis process ,which regenerate NaHSO3 waste water desulfurized by membrane process. The cation exchange membrane was prepared by sulfonation of a preformed polymer film. The film of polystyrene(PS) and divinybenzene(DVB) used oil of vitriol as sulfonate reagent,Ag2SO4 as catalyst. The average water content of the membrane was 29%.The cation exchange capacity was about 2.09 mol kg-1.The membrane conductance was around 20 cm2, equilibrated in 0.1molL-1 NaCl solution. The membrane potential reached up to 14.5mV,equilibrated in 0.1molL-1Vo.2molL-1 KCl solution. Then calculated the ion transport number and permselectivity of the membrane by it. Experiments were carried out to regenerate NaHSO3 waste water by electrodialysis using this home-made membrane Found that increase the sulfonation time can enhance the efficiency of the electrodialysis process; but if sulfonation time exceeded 8 hour, the enhancement was very minute, and the membrane began to destroyed. Use bought membranes repeated the experiments above to compare with, then found the electro-performance of the home-made membranes was close to, even exceed bought membranes. In the condition of 31 V voltage,1mmol L-1 NaHSO3 solution, after 0.5 hour electrodialysis, the efficiency of home-made memebranes began to exceed that of bought membrane.