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EFFECT OF CHLORAMINATION AND SEASONAL WATER CHANGES ON NANOFILTRATION FOULING
Citation:
Speth*, T F., C J. Parrett*, S M. Harmon*, AND K. C. Kelty*. EFFECT OF CHLORAMINATION AND SEASONAL WATER CHANGES ON NANOFILTRATION FOULING. 2001 AWWA Membrane Technology Conference & Exhibition, San Antonio, TX, 3/4-7/01.
Description:
Nanofiltraton membrane studies conducted with Little Miami Aquifer water from the Indian Hill Water Works (OH) showed tht flux loss was highly seasonal in nature with the greatest fouling occurring during the highest water temperatures during drought conditions. The reason for the greater flux decline during the October/December study was likely due to a change in the nature of the organic matter due to surface-water influences as indicated by a strongly polyhydroxy-aromatic cake layer. The expected low final flux and increased proteinaceous cake layer with chloramination was not observed in this study as it had been in the past indicating that the benefits/detriments of using chloramination to control biogrowth and hence flux loss is a site and operationally specific issue. The increased flux recovery for the chloramine system with detergent cleaning indicated that chloramination can render the foulant layer more amenable to detergent cleaning perhaps due to a lack of viable microbes and their obligatory extracellular materials. This did not occur in the ammonia system, showing that the chloramine itself was responsible for the amenability to cleaning. The chloramine system did see greater flux declines between chemical cleanings resulting in similar final fluxes for all three systems.