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EFFECTS OF CHLORAMINATION AND SITE SPECIFIC ISSUES ON NANOFILTRATION FLUX LOSS AND FOULANT CHARACTERISTICS
Citation:
Speth*, T F., C J. Parrett*, S M. Harmon*, AND K. C. Kelty*. EFFECTS OF CHLORAMINATION AND SITE SPECIFIC ISSUES ON NANOFILTRATION FLUX LOSS AND FOULANT CHARACTERISTICS. Smith, D.W., Mavinic, D.S. (ed.), JOURNAL OF ENVIRONMENTAL ENGINEERING AND SCIENCE. National Research Council Canada, 1(5):371-381.
Description:
The presence of chloramines or free ammonium ion was found to have little effect on the final specific flux and fouling cake-layer characteristics of nanofiltration membrances fed pretreated Little Miami Aquifer water. The system fed chloraminated water had the greatest amount of specific flux recovered with chemical cleaning, indicating that chloramination can render the foulant layer more amendable to detergent cleaning perhaps due to a lack of viable microbes and their obligatory extracellular materials. However, the fouling material quickly reestablished itself in the chloraminated system as shown by the rapid decline in short-term specific flux following cleaning. The expected proteinaceous cake-layer with chloramination was not observed in this study indicating that this previously observed effect is a site-, and possibly seasonally-specific issue. The membrane fouling at this location was found to have large seasonal variations with the greatest flux loss and cake-layer formation occurring during the October to December study. This was likely due to a change in the nature of the organic matter as indicated by differences in the cake layers between studies as determined by pyrolysis-GC/MS.