A pilot-scale study was performed to evaluate a coagulant dose which had been optimized for biopolymer (i.e., foulant) removal on subsequent ultrafiltration (UF) fouling, as well as disinfection by-product (DBP) precursor removal. Polyaluminum chloride (PACl) dosages were selected based on a point of diminishing returns for biopolymer removal (0.5 mg/L) and directly compared to that applied at full-scale (6 mg/L). Membrane fouling (reversible and irreversible) was measured as resistance increase over a 48 hour filtration period. DBP formation potential (total trihalomethanes (TTHMs), haloacetic acids (HAA9) and total adsorbable organic halides (AOX)) were measured in both raw and treated waters. Results of the study indicate that application of a PACl dose optimized for biopolymer reduction (0.5 mg/L) resulted in 65% less irreversible UF fouling when compared to 6 mg/L. The addition of PACl prior to the membrane resulted in up to a 14% reduction in DBP precursors relative to the UF membrane alone. A similar level of DBP precursor reduction was achieved for both 0.5 and 6 mg/L dosages. The results have implications for cost savings, which may be realized due to decreased chemical use, as well as increased membrane life associated with lower irreversible fouling rates.
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Research Article|
October 26 2015
Coagulation optimization for DOC removal: pilot-scale analysis of UF fouling and disinfection byproduct formation potential Available to Purchase
Heather E. Wray;
1Department of Civil Engineering, University of British Columbia, 6250 Applied Science Lane, Vancouver, BC V6T 1Z4, Canada
E-mail: [email protected]
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Robert C. Andrews;
Robert C. Andrews
2Department of Civil Engineering, University of Toronto, 35 St. George Street, Toronto, ON M5S 1A4, Canada
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Pierre R. Bérubé
Pierre R. Bérubé
1Department of Civil Engineering, University of British Columbia, 6250 Applied Science Lane, Vancouver, BC V6T 1Z4, Canada
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Water Supply (2016) 16 (2): 473–480.
Article history
Received:
June 29 2015
Accepted:
October 13 2015
Citation
Heather E. Wray, Robert C. Andrews, Pierre R. Bérubé; Coagulation optimization for DOC removal: pilot-scale analysis of UF fouling and disinfection byproduct formation potential. Water Supply 1 April 2016; 16 (2): 473–480. doi: https://doi.org/10.2166/ws.2015.157
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