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Ozone chemically enhanced backwash for ceramic membrane fouling control in cyanobacteria-laden water

Stéphane Venne, Onita D. Basu and Benoit Barbeau

Article (2020)

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Abstract

Membrane fouling in surface waters impacted by cyanobacteria is currently poorly controlled and results in high operating costs. A chemically enhanced backwash (CEB) is one possible strategy to mitigate cyanobacteria fouling. This research investigates the potential of using an ozone CEB to control the fouling caused by Microcystis aeruginosa in filtered surface water on a ceramic ultrafiltration membrane. Batch ozonation tests and dead-end, continuous flow experiments were conducted with ozone doses between 0 and 19 mg O3/mg carbon. In all tests, the ozone was shown to react more rapidly with the filtered surface water foulants than with cyanobacteria. In addition, the ozone CEB demonstrated an improved mitigation of irreversible fouling over 2 cycles versus a single CEB cycle; indicating that the ozone CEB functioned better as the cake layer developed. Ozone likely weakens the compressible cake layer formed by cyanobacteria on the membrane surface during filtration, which then becomes more hydraulically reversible. In fact, the ozone CEB reduced the fouling resistance by 35% more than the hydraulic backwash when the cake was more compressed.

Uncontrolled Keywords

ceramic ultrafiltration; cyanobacteria fouling; ozone; chemical cleaning; chemically enhanced backwash

Subjects: 1000 Civil engineering > 1007 Water resources and supply
1500 Environmental engineering > 1501 Water quality, pollution
Department: Department of Civil, Geological and Mining Engineering
Funders: CRSNG/NSERC
Grant number: 315841
PolyPublie URL: https://publications.polymtl.ca/9406/
Journal Title: Membranes (vol. 10, no. 9)
Publisher: MDPI
DOI: 10.3390/membranes10090213
Official URL: https://doi.org/10.3390/membranes10090213
Date Deposited: 09 Feb 2023 16:33
Last Modified: 06 Apr 2024 10:17
Cite in APA 7: Venne, S., Basu, O. D., & Barbeau, B. (2020). Ozone chemically enhanced backwash for ceramic membrane fouling control in cyanobacteria-laden water. Membranes, 10(9), 213 (17 pages). https://doi.org/10.3390/membranes10090213

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