AWWA ACE70747

This powerpoint presentation begins by presenting study goals that include: gain understanding of natural organic matter (NOM) character in Mississippi River water and its fate through conventional treatment processes that serve as pretreatment to ultrafiltration (UF); assess how NOM is partitioned by UF and how effective UF fouling management methods are for membrane-retained NOM; and, assess conventional treatment processes, as currently operated and optimzed, to control the cycling up of NOM fractions contained in UF and GMF backwash wastes if recycled. The study location and facilities are presented, along with NOM and methods used in NOM characterization, and membrane 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 complementary NOM characterization techniques, providing a means of 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 was comparable; lime softening is a key treatment process for biopolymer removal prior to the membrane system; hydraulic backwashing with air scour was effective in removing retained NOM of both a humic-like and protein-like character; more BW/AS during high-NOM spring runoff may be advantageous; backwash waste recycle is not expected to result in significant cycling up of NOM no additional waste treatment steps appear necessary, however optimization of coagulation process could improve NOM removal. Includes tables, figures.