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AWWA MTC64628
- The Effect of Monochloramine on Membrane Degradation
- Conference Proceeding by American Water Works Association, 03/01/2007
- Publisher: AWWA
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Correlation between monochloramines (NH<sub>2</sub>Cl) 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 NH<sub>2</sub>Cl 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 NH<sub>2</sub>Cl 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 (NH<sub>2</sub>Cl), fouling (NPDOC or UV-254)turbidity). NH<sub>2</sub>Cl were found statistically significant correlation to membrane slowdegradation. Includes 3 references, tables, figures.
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