This paper describes research to evaluate the significance of thin-film composite membrane surface morphology on water productivity. Flat-sheet experiments were conducted with silicon dioxide, titanium dioxide, and cerium dioxide nanoparticles. The polyamide thin-film active layer exhibited a morphology that was directly related to the surface roughness, and was found to contribute to particle accumulation causing a higher flux decline than in other membrane surfaces. Reverse osmosis and nanofiltration membrane flux decline was not affected by particle type when the feed water was laboratory grade water; however, when pretreated diluted seawater served as feed water it was found that cerium oxide addition resulted in the least observable flux decline, followed by silicon dioxide and titanium dioxide.
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- Steven Duranceau, PhD, PE
- University of Central Florida
- AMTA/AWWA Membrane Technology Conference, San Antonio, TX
- AMTA/AWWA Membrane Technology Conference
- nanofiltration; nanoparticles; reverse osmosis; water productivity