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Investigators from Arizona State University Have Reported New Data on Environmental Science and Technology (Membrane Fouling by Vesicles and...

August 15, 2014

Investigators from Arizona State University Have Reported New Data on Environmental Science and Technology (Membrane Fouling by Vesicles and Prevention through Ozonation)

By a News Reporter-Staff News Editor at Ecology, Environment & Conservation -- Research findings on Environmental Science and Technology are discussed in a new report. According to news originating from Mesa, Arizona, by VerticalNews correspondents, research stated, "Membrane fouling is a major challenge in water and wastewater treatment. Recent observations that ozone mitigates membrane fouling during filtration of secondary effluent prompted this study into the impact of preozonation on membrane fouling caused by biogenic colloids."

Our news journalists obtained a quote from the research from Arizona State University, "The focus of this study was on liposomes, synthetic vesicles composed of (phospho)lipid bilayers, which are representative of the diverse cellular vesicles present in all biologically impacted waters. The overarching hypothesis was that these biologically produced, nonrigid or 'soft' colloids (e.g., vesicles) present in wastewater give rise to unique fouling behavior that can be mitigated by preozonation."

According to the news editors, the research concluded: "Using dead-end ultrafiltration (UF) and batch ozonation tests, the key findings of this study were (1) liposomes fouled UF membranes faster (4-13 times membrane cake resistance (R-C) per mgC filtered) than polysaccharides, fatty acids, and NOM on a DOC-normalized basis; (2) based on the estimated carbon distribution of secondary effluent, liposome-like biogenic nanomaterials could be responsible for 20-60% of fouling during UF; and (3) preozonation reduces liposomal fouling during UF, likely due to the disruption of the liposome structure through cleavage of the fatty acid tails at carbon-carbon double bonds."

For more information on this research see: Membrane Fouling by Vesicles and Prevention through Ozonation. Environmental Science & Technology, 2014;48(13):7349-7356. Environmental Science & Technology can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society -; Environmental Science & Technology -

The news correspondents report that additional information may be obtained from M.C. Barry, Arizona State University, Polytechnic Sch, Ira A Fulton Sch Engn, Mesa, AZ 85212, United States. Additional authors for this research include K. Hristovski and P. Westerhoff.

Keywords for this news article include: Mesa, Arizona, United States, North and Central America, Environmental Science and Technology

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Source: Ecology, Environment & Conservation

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