AWWA MTC64628

Correlation between monochloramines (NH₂Cl) 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 NH₂Cl 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 NH₂Cl 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 (NH₂Cl), fouling (NPDOC or UV-254)turbidity). NH₂Cl were found statistically significant correlation to membrane slowdegradation. Includes 3 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

03/01/2007

Number of Pages:

10

File Size:

1 file , 400 KB