Ultrafiltration Fouling Reduction With The Pilot-Scale Application Of Ozone Preceding Coagulation, Flocculation, And Sedimentation For Surface Water Treatment

Keywords

Coagulation; Fouling indices; Membrane; Ozone; Ultrafiltration

Abstract

An ultrafiltration (UF) membrane process integrating ozone oxidation prior to a coagulation, flocculation, and sedimentation (CFS) pretreatment configuration processing surface water has been evaluated at the pilot-scale. Unlike prior research limited to short-term bench-scale evaluations, this current study provides information regarding the application of ozone oxidation prior to a CFS-UF pilot process operating over a four-month period (2,800 pilot runtime hours). In this work, changes in the long-term fouling behavior of the UF membrane process in response to the application of ozone prior to CFS pretreatment were characterized using fouling indices. When an average of 2.5 mg L−1 of ozone was applied prior to coagulation requiring 27 mg L−1 of polyaluminum chloride and a UF operating water flux of 85 L h−1 m−2, the chemically reversible and hydraulically irreversible fouling indices increased by 59 and 40%, respectively. A reduction of chemically irreversible fouling concomitant with a continuous improvement of normalized specific flux was observed over 1,240 pilot runtime hours of ozone application. The total fouling index decreased by 41% as compared to the baseline CFS-UF configuration. This research indicates that the use of ozone oxidation prior to a CFS-UF configuration can reduce membrane fouling when integrated with conventional surface water treatment.

Publication Date

12-7-2016

Publication Title

Desalination and Water Treatment

Volume

57

Issue

57

Number of Pages

27433-27440

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1080/19443994.2016.1180266

Socpus ID

84965031175 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84965031175

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