Mineral recovery from inland reverse osmosis concentrate using isothermal evaporation

Farah Mohammadesmaeili, Mostafa Kabiri Badr, Morteza Abbaszadegan, Peter Fox

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


Mineral recovery from reverse osmosis (RO) concentrate after concentration by a secondary sea water-type RO system with lime-soda pretreatment was the focus of this study. Lime-soda pretreatment removed Ca, Mg and Si allowing for the application of sea water-type RO resulting in a concentrate composed of sodium, potassium, sulfate and chloride. The overall objective was reduction in concentrate volume that will require disposal by evaporation while producing by-products with potential resale value. Thermodynamic phase equilibrium calculations using Pitzer's correlations for 25 °C, accurately predicted the solubility and evaporation path of the sodium sulfate minerals as potential by-products. Bench-scale evaporation experiments verified the model predictions and indicated that 81-88% of the sodium sulfate by-products were Na2SO4.

Original languageEnglish (US)
Pages (from-to)6021-6030
Number of pages10
JournalWater Research
Issue number20
StatePublished - Dec 2010


  • By-product
  • Concentrate
  • Evaporation
  • Mineral recovery
  • Reverse osmosis

ASJC Scopus subject areas

  • Ecological Modeling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution


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