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Preozonation Effects on Organic Foulants in a Coagulation–Ultrafiltration Membrane Process
The effect of integrating ozone ahead of coagulation, flocculation, and sedimentation (CFS) as pretreatment to ultrafiltration (UF) membranes was investigated at the bench scale for treatment of a surface water containing organic foulants. Ozone was applied before a CFS–UF process and compared with a CFS–UF condition without ozone as the control. While CFS alone reduced turbidity by 27%, CFS increased turbidity by 61% while applying ozone. When integrated with CFS and UF, however, ozone reduced filtrate true color by 40%, ultraviolet absorbance (UVA) at 254 nm by 10%, and specific UVA by 30%, relative to the control, indicating that while ozone had impaired turbidity removal during CFS pretreatment, it had improved removal of aromatic‐rich organics. Fluorescent excitation–emission matrixes confirmed that humic acid‐like and fulvic acid‐like substances known to cause irreversible fouling were retained on the control membrane but were absent on the membrane when ozone was integrated with CFS pretreatment.
Preozonation Effects on Organic Foulants in a Coagulation–Ultrafiltration Membrane Process
The effect of integrating ozone ahead of coagulation, flocculation, and sedimentation (CFS) as pretreatment to ultrafiltration (UF) membranes was investigated at the bench scale for treatment of a surface water containing organic foulants. Ozone was applied before a CFS–UF process and compared with a CFS–UF condition without ozone as the control. While CFS alone reduced turbidity by 27%, CFS increased turbidity by 61% while applying ozone. When integrated with CFS and UF, however, ozone reduced filtrate true color by 40%, ultraviolet absorbance (UVA) at 254 nm by 10%, and specific UVA by 30%, relative to the control, indicating that while ozone had impaired turbidity removal during CFS pretreatment, it had improved removal of aromatic‐rich organics. Fluorescent excitation–emission matrixes confirmed that humic acid‐like and fulvic acid‐like substances known to cause irreversible fouling were retained on the control membrane but were absent on the membrane when ozone was integrated with CFS pretreatment.
Preozonation Effects on Organic Foulants in a Coagulation–Ultrafiltration Membrane Process
Biscardi, Paul G. (author) / Duranceau, Steven J. (author)
Journal ‐ American Water Works Association ; 109 ; 15-24
2017-02-01
10 pages
Article (Journal)
Electronic Resource
English
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