Characterization of Newly Synthesized Nanofiltration Membranes by means of Sodium Diatrizoate Dihydrate Permeation Experiments
Nanofiltration (NF) membranes provide approximately rejections of 90-99% for a wide variety of organic compounds encountered in natural waters. However, some contaminants such as arsenic are not well rejected by existing NF membranes. New Rigid Start Amphiphiles (RSA) NF membrane promise the ability to have greater removal this kind of contaminants. Therefore, RSA-NF performance was characterized. Experiments were performed with sodium diatrizoate dihydrate (SDD) and arsenic (III). Water flux obtained experimentally was higher for the new RSA-NF membrane compared to those for the commercial membranes. Permeation experiments revealed the occurrence of stable SDD rejection by RSA-NF. Unfortunately, arsenic (III) was not reject as well by the RSA-NF membrane in comparison with commercial NF membranes. Arsenic (III) diffusion and SDD advection were found to the main mechanisms responsible for their permeation through the RSA-NF was deduced from NF transport model equation.
School:
University of Puerto Rico at Mayagüez
Department:
Chemical Engineering
Research Advisor:
Benito Mariñas
Department of Research Advisor:
Civil and Environmental Engineering
Year of Publication:
2006