AWWA ACE70747

This powerpoint presentation begins by presenting study goals that include: gain understanding of natural organic matter (NOM) character in MississippiRiver water and its fate through conventional treatmentprocesses that serve as pretreatment to ultrafiltration (UF);assess how NOM is partitioned by UF and how effectiveUF fouling management methods are for membrane-retainedNOM; and,assess conventional treatment processes, as currentlyoperated and optimzed, to control the cycling up of NOMfractions contained in UF and GMF backwash wastes ifrecycled. The study location and facilities are presented, along withNOM and methods used in NOMcharacterization, andmembrane fouling/fouling management. Conclusions indicate that: by characterizing NOM fractions using advanced techniques, insight can be obtained on NOM behavior throughout the treatment process; LC-OCD and EEM are effective and complementaryNOM characterization techniques, providing a meansof determining which MW fractions are most important in UF fouling and overall treatment efficiency;despite differing NOM levels during the three campaigns, removal efficiency of NOM fractions wascomparable; lime softening is a key treatment process for biopolymerremoval prior to the membrane system; hydraulic backwashing with air scour waseffective in removing retained NOM of both ahumic-like and protein-like character; moreBW/AS during high-NOM spring runoff may beadvantageous; backwash waste recycle is not expected to result in significant cycling up of NOMno additional waste treatment steps appear necessary, however optimization of coagulationprocess could improve NOM removal. Includes tables, figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2009

Number of Pages:

30

File Size:

1 file , 2.5 MB