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

Stéphane Venne, Onita D. Basu et Benoit Barbeau

Article de revue (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.

Mots clés

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

Sujet(s): 1000 Génie civil > 1007 Ressources et approvisionnement en eau
1500 Génie de l'environnement > 1501 Qualité de l'eau, pollution
Département: Département des génies civil, géologique et des mines
Organismes subventionnaires: CRSNG/NSERC
Numéro de subvention: 315841
URL de PolyPublie: https://publications.polymtl.ca/9406/
Titre de la revue: Membranes (vol. 10, no 9)
Maison d'édition: MDPI
DOI: 10.3390/membranes10090213
URL officielle: https://doi.org/10.3390/membranes10090213
Date du dépôt: 09 févr. 2023 16:33
Dernière modification: 18 mai 2023 21:41
Citer en 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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