AWWA ACE58191

The objective of this study was to investigate the pore size distribution (PSD) of nanofiltration (NF) membranes using gasadsorption and Atomic Force Microscopy (AFM) methods and to elucidate the mechanisms responsible for thepassage of different solutes (Rhodamine-WT, arsenious acid and sodium chloride)through nanofiltration (NF) membranes. Rhodamine-WT (R-WT), a fluorescent chemical withmolecular weight of 480 Daltons and approved for use as a tracer chemical in drinkingwater, was used as a surrogate for organic solutes. R-WT concentrations were measuredusing a Bowman Series 2 Luminescence Spectrometer.An excitation wavelength of 550 nm and emission wavelength of 570-700 nm were used.The minimum quantification level was 50 ng/L. Two inorganic solutes were also studied,sodium chloride and sodium arsenite. Chloride ion was analyzed by ion chromatographyStandard Method 4110B using a Dionex Ion Chromatograph Model DX-300, and the concentration of arsenious acid was determined by a ThermoElemental ExCell Inductively Coupled Plasma/Mass Spectrometry (ICP-MS) using Yttrium as an internal standard.Lab-scale experiments were performed with a closed-loop system consisting of two flat-leaf cells connected in series. Each flat-leaf cell consisted of two stainless steel316 plates, separated by a membrane coupon sealed by two o-rings placed in the bottomplate. Feed water went into each cell and circulated through a feed channel in the bottomplate parallel to the membrane surface. Experiments were performed with small coupons cut from a sheet ofESNA or TFCS NF membranes. Includes 2 references, table, figures.

Product Details

Edition:

Vol. - No.

Published:

06/15/2003

Number of Pages:

8

File Size:

1 file , 430 KB