ENHANCED PROCESS FOR SELECTIVE SALT RECOVERY FROM WASTEWATER, WASTE SALTS, AND BRINES
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United States of America Patent
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Issued Date -
Feb 1, 2018
app pub date -
Jul 26, 2017
filing date -
Jul 28, 2016
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Abstract
A process for treating wastewater or waste brines that include sodium and chloride ions. The waste brine is concentrated and thereafter directed to a Mirabilite crystallizer that produces hydrated sulfate salt crystals and a first solution. The hydrated crystals are melted to form an aqueous sulfate solution that is directed to a sodium sulfate crystallizer which produces sodium sulfate salt crystals. The first solution produced by the Mirabilite crystallizer is directed to a nanofiltration device which produces a permeate stream and a reject stream containing sulfate removed by the nanofiltration device. The permeate stream is directed to a sodium chloride crystallizer that produces sodium chloride salt crystals. The reject stream is recycled to the Mirabilite crystallizer.
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