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The objective of this study was to examine some of the mechanisms responsible for thepassage of organic and inorganic solutes through nanofiltration/reverse osmosis (NF/RO) membranes by runningpermeation tests, developing hydraulic model and characterizing relevant membraneproperties. The materials used included Rhodamine-WT, a chemical with molecular weightof 480 Daltons and approved for use as a tracer chemical in drinking water. It was used as asurrogate for organic solutes. The inorganic solute studied was sodium arsenite, arelatively common water contaminant, which is hard to remove by most conventionalwater treatment techniques.Permeation tests involvedlab-scale experiments performed with a closed-loop system consisting of two flatleaf cells connected in series. Analytical methods involved measuringR-WT concentration using a Bowman Series 2 LuminescenceSpectrometer. An excitation wavelength of 555 nm andan emission wavelength of 585 nm were used. The minimum detection level was 50 ng/L. Partition experiments and Rutherford Backscattering (RBS) are discussed. Includes 4 references, tables, figures.

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Edition: Vol. - No. Published: 03/01/2005 Number of Pages: 8File Size: 1 file , 470 KB