关键词: 丙烯酸树脂, 静态吸附, 脱硫废水, 氯离子

Abstract:

During the operation of the wet flue gas desulfurization system,the chlorine ions in the absorption tower slurry will gradually accumulate due to the circulation of absorbent,which will cause great harm to the desulfurization system and the surrounding environment. So the dechlorination of the desulfurization wastewater was researched.The acrylic acid strong base anion exchange resin has been used for removing Cl ^- from desulfurization wastewater,and the adsorption capacity of the anion exchange resin in static and dynamics state,the mass concentration of Ca ²⁺,Mg ²⁺ ion and the regeneration performance of the resin in dynamics state were contrasted and the influence of chelating agent and water softener on pH and the mass concentration of Cl ^-、Ca ²⁺ and Mg ²⁺ in the adsorption process was studied emphatically.The regeneration performance of the resin under static adsorption conditions was also investigated.The results showed that under dynamic adsorption conditions,the regeneration performance of the resin was greatly reduced due to the influence of flocculent precipitation.Under static adsorption conditions,the adsorption capacity of the anion exchange resin was about 30% less than that of the dynamic adsorption conditions.The addition of chelating agent and water softener was helpful not only to increase the adsorption capacity of resin but also to reduce pH and Cl ^- in the adsorption process.It could also help to reduce the influence of the flocculent precipitate produced by free calcium and magnesium ions on the adsorption performance of the resin and improve the regeneration performance of the resin.

Key words: acrylic anion exchange resin, static adsorption, desulfurization wastewater, chloride ion