Preozonation Effects On Organic Foulants In A Coagulation-Ultrafiltration Membrane Process

Keywords

Coagulation; Fluorescence; Preozonation; Ultrafiltration

Abstract

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.

Publication Date

2-1-2017

Publication Title

Journal - American Water Works Association

Volume

109

Issue

2

Number of Pages

15-24

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.5942/jawwa.2017.109.0013

Socpus ID

85012181547 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85012181547

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