Fig. 6.
Selenium removal with iron functionalized membranes in different water matrix under convective flow condition. [Se]0=1.3±0.1 mg/L in scrubber water, [Fe]0=8.4 mg (20.7 % weight gain), [TDS]0=12 g/L ([SO42−]0=11.7 mM or 1120 mg/L); [Se]0=52.3 μg/L in NF permeate-1 (positively charged NF membrane), [Fe]0=9.9 mg (23 % weight gain), [TDS]0=2.4 g/L ([SO42−]0=292 μM or 28 mg/L); [Se]0=11.0 μg/L in NF permeate-2 (negatively charged NF membrane), [Fe]0=9.2 mg (23 % weight gain), [TDS]0=0.92 g/L ([SO42−]0=0.094 μM or 9 mg/L); [Se]0=2.0±0.2 mg/L in DI water, [Fe]0=4.0 mg (12.5 % weight gain). pH of feed solution: 4.5–5.5.