Performance Of An Acid Stable Nanofiltration
Membrane For Nickel Removal From
Aqueous Solutions: Effects Of Concentration,
Solution PH
And Ionic Strength
Author(s)
O. Agboola, J. J. Schoeman, J. Maree, R. Mbaya & A . Kolesnikov
Abstract
The performance of a nanofiltration membrane for the removal of the nickel ion
was studied as a function of the nickel concentration, solution pH, and the
background ionic strength of the solution. Nanofiltration is investigated as a
means to determine to what extent the nickel ions could be removed from acid
mine drainage; thus the effect of solution chemistry on nanofiltration
performance is investigated. Higher fluxes (47.6l/m²/h) were experienced at the
lower nickel concentration (10mg/l) than at the higher (28.9l/m²/h) nickel
concentration (100mg/l). Higher nickel ion rejections (97.3%) were obtained at
the higher nickel concentration (100mg/l) than at the lower nickel concentration
(93.6%). Higher flux was obtained at the higher pH (pH 4) with a 0.01M NaCl
background solution than at lower pH (pH 3) when a 0.05M NaCl was used as
background solution. Higher nickel ion rejections were obtained at higher pH
(pH 4) for the two ionic strength background solutions. Higher fluxes were also
obtained with the lower NaCl background solution. Slightly higher ion rejections
were obtained with the lower NaCl background concentration. It therefore
appears that this nanofiltration membrane should be successfully applied for the
removal of nickel ions from acid mine drainage.
Keywords: nanofiltration, acid mine drainage, nickel removal, nickel rejection,
fluxes, nickel concentrations, solution pH, ionic strength.
Keywords
nanofiltration, acid mine drainage, nickel removal, nickel rejection,
fluxes, nickel concentrations, solution pH, ionic strength.
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