International Sugar Journal

Cane sugar refineries: towards a ‘green’ process solution for fine liquor de-colorization* [Full subscriber]

Abstract         The most common way to remove sugar color in cane refineries is by using strong anionic resins, regenerated with brine (NaCl) solution.  This process generates significant volumes of salty and highly COD-loaded wastewaters.  Due to increasing environmental pressures, companies have developed different process solutions aiming at limiting this wastewater production, optimizing water and chemical consumption and maximizing recycling.  Those solutions are based on nanofiltration membrane technologies, the key process operation to separate salts from color bodies.  A single nanofiltration process was developed in the early 2000s to recover and recycle up to 75% of the brine.  Further improvements led…

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