title: Effect of ozone on biopolymers in biofiltration and ultrafiltration processes.
abstract: The focus of this full-scale study was to determine the effect of ozone on biopolymer concentrations in biofiltration and ultrafiltration (UF) processes treating surface water from Lake Ontario. Ozonation was out of service for maintenance for 9 months, hence, it was possible to investigate ozone's action on biologically active carbon contactors (BACCs) and UF, in terms of biopolymer removal. Given the importance of biopolymers for fouling, this fraction was quantified using a chromatographic technique. Ozone pre-treatment was observed to positively impact the active biomass in biofilters. However, since an increase of the active biomass did not result in higher biopolymer removal, active biomass concentration cannot be a surrogate for biofiltration performance. It was evident that increasing empty bed contact time (EBCT) from 4 to 19 min only had a positive effect on biopolymer removal through BACCs when ozone was out of service. However, as a mass balance experiment showed, ozone-free operation resulted in higher deposition of biopolymers on a UF membrane and slight deterioration in its performance.
authors.affiliation: NSERC Chair in Water Treatment, University of Waterloo, 200 University Ave West Waterloo, ON N2L 3G1, Canada. Electronic address: barbara.siembida@gmx.de.
authors.forename: Barbara
authors.initials: B
authors.lastname: Siembida-Lösch
authors.affiliation: NSERC Chair in Water Treatment, University of Waterloo, 200 University Ave West Waterloo, ON N2L 3G1, Canada.
authors.forename: William B
authors.initials: WB
authors.lastname: Anderson
authors.affiliation: NSERC Chair in Water Treatment, University of Waterloo, 200 University Ave West Waterloo, ON N2L 3G1, Canada.
authors.forename: Yulang Michael
authors.initials: YM
authors.lastname: Wang
authors.affiliation: Water Division, Public Works Peel Region, 920 East Avenue, Mississauga L5E 1W6, Canada.
authors.forename: Jane
authors.initials: J
authors.lastname: Bonsteel
authors.affiliation: NSERC Chair in Water Treatment, University of Waterloo, 200 University Ave West Waterloo, ON N2L 3G1, Canada.
authors.forename: Peter M
authors.initials: PM
authors.lastname: Huck
mesh_terms: D001704:Biopolymers / Q000737:chemistry*; D005374:Filtration / Q000379:methods*; D009864:Ontario; D010126:Ozone / Q000737:chemistry*; D014462:Ultrafiltration; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D001704:Biopolymers; D014874:Water Pollutants, Chemical; D010126:Ozone
keywords: Adenosine triphosphate; Biopolymers; Fouling; LC-OCD; Ozone/biologically active carbon filtration; Ultrafiltration