AWWA ACE68689

The objectives of this powerpoint presentation include the following: examine rejections of nitrosamines and their precursors by nanofiltration (NF) andbrackish water reverse osmosis (BWRO) membranes; assess the effects of operating parameters on nitrosamine rejections; and, quantitatively analyze the transport parameters of nitrosamines. Experimental procedures are presented, along with nitrosamine filtration, modeling of nitrosamine filtration results, and nitrosamine precursor filtration. Presentation conclusions indicate that:NF membranesshowed relatively low rejections (9-75%) andwould not be a viable option, especially for low MW nitrosamines;BWRO membranesshowed much higher rejections (54-97%) and additional treatment steps would be required for low MW nitrosamines;rejection mechanism showed that rejections of nitrosamines (uncharged compounds) dominantlygoverned by size exclusion, relatively low rejections of low MW nitrosamines are primarily due toeffective diffusion through BWRO membranes, and transport of nitrosamines through BWRO membranes found to beproportional to aqueous diffusivity. Includes 8 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2008

Number of Pages:

27

File Size:

1 file , 1.6 MB