Simple process for hardening desalinated water with Mg2+ ions

David Hasson*, Raphael Semiat, Hilla Shemer, Menachem Priel, Nissim Nadav

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


A simple easily controlled technique for adding Mg2+ ions to desalinated water is described. The Israeli Health Authority recommendation of adding of 20-30 mg/L of Mg2+ can be readily met by dissolution of magnesia pellets in a packed bed column. Experimental data are presented showing the effects of the specific flow velocity and CO2 acidification of the inlet desalinated water on the Mg2+ concentration in the product stream leaving the column. Acidification of the inlet feed water is shown to enhance considerably the dissolution process. A kinetic expression is presented enabling full design of a dissolution packed column with nonacidified water.

Original languageEnglish
Pages (from-to)924-929
Number of pages6
JournalDesalination and Water Treatment
Issue number4-6
StatePublished - 2013
Externally publishedYes


  • Desalinated water
  • Hardening
  • Kinetic model
  • Magnesia dissolution
  • Magnesium

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