Sulfate removal from the sea by anion exchange process combined with k2 so4 precipitation

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Abstract

Sulfates can be removed from seawater by weak base anion exchanger which is regenerated with concentrated potassium chloride solution. The potassium sulfate was removed from the regeneration solution by adding solid KCl, which reduced the solubility of K2 SO4 causing its precipitation. Dilution of the regenerated solution was substantially reduced by using three displacement solutions with different KCl concentrations. Precipitation of potassium sulfate in the column during regeneration was prevented by heating the regeneration solution to 55°C. After the regeneration solution exited the column, it was cooled to achieve maximum precipitation of the K2 SO4 . The weight of the K2 SO4 obtained was about the same as that of the KCl used for regeneration. The concentration of sulfate in seawater was reduced from 34 mM to less than 15 mM. To produce one ton of potassium sulfate about 250 tons of seawater is needed. The volume of the solution disposed of to the drain approached zero.

Original languageEnglish
Pages (from-to)150-154
Number of pages5
JournalDesalination and Water Treatment
Volume201
DOIs
StatePublished - 1 Oct 2020

Keywords

  • Anion exchanger
  • Recycled regeneration
  • Seawater
  • Sulfate removal

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