Swirling fluidization in an anoxic membrane bioreactor as an antifouling technique

Ramírez, J. Ernesto; Esquivel-González, Saúl; López-Rebollar, Boris Miguel; Salinas, Humberto; Rangel-Méndez, J. Rene; Buitrón, Germán; Cervantes, Francisco J.

doi:10.1016/j.memsci.2020.117856

Cited by 6 publications

(2 citation statements)

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“…25 Moreover, extensive analysis has been conducted on the influence of the size and shape of fouling agents, 26 as well as microorganism type and particle concentration on cake compressibility. 27 Previous studies have concluded that cake compressibility also seems to influence reversible fouling characteristics. 28 Furthermore, changes in membrane fouling rates due to residual fouling have been reported, 29 although no significant changes in the cake structure due to residual fouling have been described so far.…”

Section: Introductionmentioning

confidence: 99%

“…Many authors have analyzed the compressibility of the cake and the synergies between different fouling control methods, such as relaxation, or shear effect . Moreover, extensive analysis has been conducted on the influence of the size and shape of fouling agents, as well as microorganism type and particle concentration on cake compressibility …”

Section: Introductionmentioning

confidence: 99%

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Influence of Air Scouring and Residual Fouling on Cake Build-Up and Compression in Membrane Bioreactors

Díaz,

González,

Vera

2024

Ind. Eng. Chem. Res.

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Compressible cake formation in membrane bioreactors, a key fouling mechanism in domestic wastewater reclamation, results from the deformable nature of foulants. This study investigates the combined impact of air scouring, shear stress, and consolidated residual fouling on compressible cake formation. A simple mathematical model is proposed that describes the net stress of attracted material on the membrane with a convective shear transport flux, which is dependent on applied shear stress and consolidated residual fouling. The convective flux is linked to the threshold flux, providing a straightforward relationship between step flux trials and cake formation. Results indicate that residual fouling reduces the effectiveness of membrane aeration and accelerates cake build-up. In addition, the cake's specific resistance decreases exponentially with the net attractive force of materials during its accumulation, influencing the compressibility coefficient. The proposed model identifies a threshold net material attraction flux, allowing fouling without exceeding an acceptable compressibility level.

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