Abstract
The present paper demonstrates the novel combinatorial approach to decrease the Boron concentration in RO permeate by making surface modification of polyamide layer and making a boron complex in feed water to achieve higher removal efficiency. Thin Film Composite Reverse Osmosis membrane was subjected to treatment with sodium hypochlorite of 2000mg/L for duration of 1h, 2h, 3h, and 4h respectively. The treatments resulted in increase in significant increase in water-flux with minor increase in boron rejection. Feed solution with 10mg/L boron was mixed with mannitol and methyl salicylate to form the complex with boron. It was observed that boron rejection increased 97.56% at 125psig (pounds per square inch gauge) and 97.81% at 400psig pressure when mannitol was added in feed at pH 10. The highest boron rejection with methyl salicylate was 92.84%, although the water flux with methyl salicylate addition in feed water were higher as compared to the feed water with mannitol or plain feed water. The formation of boron complex responsible for increased boron rejection was confirmed by FTIR and NMR spectra. The membrane samples were characterized to understand the change in chemical structure and morphology of the membrane by ATR-FTIR, SEM, AFM and XRD.
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