Application of Ion Exchange Resin in Desalination of Papermaking Wastewater
In this study,732 hydrogen type cation exchange resin(cation resin)and 201×7 hydroxide anion exchange resin(anion resin)were used for the desalination of papermaking wastewater.The adsorption properties of the resin for ions in papermaking wastewater during the static adsorption and dynamic adsorption were studied.The results showed that cation resin had obvious removal effect on Na+,Ca2+,Mg2+,and Fe3+in the papermaking wastewater,and anion resin had obvious removal effect on Cl-and SO42-.The optimal static adsorption time was 15 min,and the desalting effect was best when combined with cation resin and anion resin mass ratio was 1.2∶1.4.In the process of dynamic adsorption,with the increase of flow velocity,the removal effect of resin on ions gradually weakened.The appropriate dynamic adsorption velocity of cation resin should be 4～12 BV/h,and the appropriate dynamic adsorption velocity of anion resin should be 4～10 BV/h.The op-timal regeneration conditions of cation resin were the dynamic adsorption velocity of regenerated liquid 4 BV/h,the concentration of 4%,the volume of 3 BV,and the regeneration rate of 94%.The optimal regeneration conditions of cation resin were the dynamic adsorption velocity of regenerated liquid 4 BV/h,the concentration of 5%,the volume of 3 BV,and the regeneration rate of 84%.When the resin was fully regenerated several times after saturated adsorption,the regeneration rate of cation resin was kept above 90%,and that of anion resin was kept above 80%.
ion exchange resindesalinationpapermaking wastewater
万方数据
维普
