REMOVAL OF BORON FROM SALINE WATER USING ALKALIZED NF MEMBRANE PRETREATMENT

摘要

The removal of boron from saline water based using alkalized NF membrane pretreatment can be adopted at 90% recovery and pH 8-9.5 to produce softened and alkalized NF permeate having SDI<1 with significant reduction in feed boron, TDS and scale-forming ions, depending on the properties of the NF membrane polymer structure. NF process acts as a softening process, as well as a boron removal process. An additional RO membrane alkalization can be adopted at a wide range of RO feed at pH 8.5-10, resulting in production of desalinated water with almost nil boron content.