Salt production from wastewater

A method for salt production from a wastewater stream, comprising:

• a) providing a wastewater stream comprising sulfate ions and chloride ions;
• b) pretreating the wastewater stream with at least one unit operation selected from the group consisting of hardness removal, silica reduction, alkalinity reduction, total organic carbon reduction, and pH adjustment;
• c) feeding the wastewater stream to a first stage crystallizer, thereby precipitating and growing sodium sulfate crystals in a first mother liquor;
• d) separating the sodium sulfate crystals from the first mother liquor;
• e) collecting the first mother liquor and sending it to a chemical reaction vessel;
• f) dosing a reactive chemical to the chemical reaction vessel, thereby removing sulfate ion from solution in the wastewater stream as a precipitated solid and removing the precipitated solid to produce a purified sodium chloride brine;
• g) sending the purified sodium chloride brine into a second stage crystallizer, thereby precipitating and growing sodium chloride crystals in a second mother liquor;
• and
• h) separating the sodium chloride crystals from the second mother liquor.