Study on fractional crystallization process of ammonium sulfate and sodium sulfate in high salt wastewater
The treatment of high salinity wastewater and the recycling of salt resources in wastewater are challenging task faced by enterprises.The liquid-solid equilibrium data of Na2SO4-(NH4)2SO4-H2O at 10,15,60 and 80℃were determined by isothermal solution equilibrium method,and the crystallization regions were divided based on phase equilibrium data.A fractional crystallization process was then proposed for the separation and recovery of(NH4)2SO4 and Na2SO4 based on the composition of the high salinity wastewater and the liquid-solid equilibrium data.The technological parameters of the crys-tallization process were designed and experimentally verified.The results showed that the purity of(NH4)2SO4 and Na2SO4 by three-step crystallization reached 99.2%and 98.9%respectively,which met the purity index of national standard of GB/T 535-2020 and GB/T 6009-2014.This study provided valuable reference for the recovery of(NH4)2SO4 and Na2SO4 from high salinity wastewater.
high salt wastewaterammonium sulfatesodium sulfatefractional crystallization
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NSTL
万方数据
维普
