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Enhanced Boron Rejection By Nf/Ro Membranes By Complexation With Polyols: Measurement And Mechanisms, Kha L. Tu, Allan R. Chivas, Long D. Nghiem
Enhanced Boron Rejection By Nf/Ro Membranes By Complexation With Polyols: Measurement And Mechanisms, Kha L. Tu, Allan R. Chivas, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
Boron rejection by nanofiltration (NF) and reverse osmosis (RO) membranes in the presence of glycerol, mannitol and sorbitol was investigated as a function of feed solution pH and boron:polyol molar ratio. In the presence of polyols, significant boron rejection improvement was obtained and the extent of the impact was directly related to the stability constant of the boron-polyol complex. Polyols could complex with boron in either the boric acid or borate anion forms; however the complexation between polyol and boric acid appeared to be incomplete. With and without the presence of polyols, boron rejection was strongly pH dependent. The increase …