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Correlation between monochloramines (NHsub2/subCl) and membrane solute rejection andproductivity based on data from an extensive pilot study are summarized in this paper.Decreasing salt rejection was observed during selection of CSF pretreatment, whichincluded Actiflo-Rapid Sand Filtration (RSF), Super Pulsator (SP)-RSF and Zenonsubmersed micro-filter. Decreasing productivity was observed in the long term phase ofthe project. Varying salt rejection and productivity indicated loss of membrane integrityand was correlated to NHsub2/subCl mass loading.During phase II, 4 LPRO membranes were tested using Actiflo-RSF and Zenon microfiltrationand chloramination. The performance of eight membranes wasmonitored continuously over 6 months. Membrane productivity and solute mass transfermass loading models were developed from this data set and incorporated NHsub2/subCl massloading in an overall mass transfer coefficient that incorporates time of operation andchloramine dose. Productivity and solute mass transfer coefficient changed with timedue to natural film degradation, oxidation (NHsub2/subCl), fouling (NPDOC or UV-254)turbidity). NHsub2/subCl were found statistically significant correlation to membrane slowdegradation. Includes 3 references, tables, figures.

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Edition: Vol. - No. Published: 03/01/2007 Number of Pages: 10File Size: 1 file , 400 KB