Caustic recovery of CIP streams in food, pharma and the textile industry is of significant importance as caustic is expensive and its disposal creates a hazardous waste treatment problem. The contaminated dilute caustic from these processes is commonly concentrated and recovered by evaporation, but evaporators cannot recover highly contaminated caustic. In the past, it had to be neutralized prior to disposal. However, the use of membrane technology can clarify highly contaminated caustic for reuse.
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