Journal
WATER RESEARCH
Volume 70, Issue -, Pages 224-234Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2014.11.047
Keywords
Adenosine triphosphate; Biopolymers; Fouling; LC-OCD; Ozone/biologically active carbon; filtration; Ultrafiltration
Funding
- Region of Peel
- Ontario Research Fund (ORF)
- Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant
- Deutsche Forschungsgemeinschaft (DFG) postdoctoral fellowship [SI 1772/2-1]
- Industrial Research Chair in Water Treatment at the University of Waterloo
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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. (C) 2014 Elsevier Ltd. All rights reserved.
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