Purification of synthetic wastewaters by nanofiltration
2009
Kertesz, Sz., University of Szeged, Szeged (Hungary). School of Environmental Sciences | Laszlo, Z., University of Szeged, Szeged (Hungary). Faculty of Engineering | Horvath Hovorkane, Zs., University of Szeged, Szeged (Hungary). Faculty of Engineering | Hodur, C., University of Szeged, Szeged (Hungary). Faculty of Engineering
The aim of the present work was to examine the filterability of an anionic surfactant and to determine the optimal parameters for the filtration process. The effect of different surfactant solutions on membrane permeability was examined at different pressures and temperatures. The performance of a DL nanofiltration flat sheet membrane for anionic detergent solutions was investigated. For this purpose, normalized flux values, fouling index (k) and retention (R) as a function of processing parameters (temperatures and pressures), were determined. The data were evaluated statistically in order to identify the parameters affecting the retention and flux. The retention was principally affected by the temperature, the highest retention being observed at the lowest temperature. The highest flux was measured at the highest temperature. The fouling index was mainly affected by the temperature, decreasing with increasing temperature. The ideal parameters for best surfactant retention at a reasonable flux and for minimal fouling in the nanofiltration process were 30 deg C and 30 bar or 40 bar. With increasing pressure there was an increase in membrane flux, but this phenomenon was overshadowed by the influence of the changes in gel-layer formation with increasing detergent concentration.
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