CFD evaluation of mass transfer distribution heterogeneity along the membrane-liquid interface in stirred submerged membrane bioreactors

Vlaev, S. D.; Dzhonova-Atanasova, Daniela; Tsibranska, I.

doi:10.1016/j.cep.2019.107738

Cited by 7 publications

(4 citation statements)

References 49 publications

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“…Some studies have been carried out on a membrane filtration performance study in stirred membrane reactors, including physical properties of liquid and solid particles, , operation conditions such as temperature and pressure drop, , and hydrodynamic properties such as the agitation speed − and shear rate − near the membrane module. Except for the stirred dead-end filtration configuration, the earlier submerged stirred membrane reactor is the internal filtration bioreactor. − The work of Lee et al and Park et al indicated that the strong shear rate induced by the high agitation rate could remove the gel and cake layer of yeast cells.…”

Section: Introductionmentioning

confidence: 99%

“…However, the filtration did not reach the quasi-steady state. Furthermore, flow perpendicular to the membrane surface was proved to be favorable for mass transfer by Vlaev et al, , but the membrane fouling was not considered. In general, the literature described qualitatively mainly rather than quantitatively about the effects of hydrodynamics on membrane fouling in SMRs.…”

Section: Introductionmentioning

confidence: 99%

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Effects on the Performance of Filtration in a Constant-Pressure Stirred Membrane Reactor

Hui

Wang

Mao

et al. 2022

Ind. Eng. Chem. Res.

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Membrane fouling is a troublesome factor in the design and scale-up of stirred membrane reactors. Many efforts have been made to study the fouling mechanism in traditional membrane filtration. However, it is still ambiguous in stirred membrane reactors (SMRs). For this purpose, we investigated the effects of hydrodynamics on membrane filtration performance in SMRs under constant-pressure operation by combining experiment and computational fluid dynamics (CFD) simulation. The results indicate that the strong axial flow is beneficial in maintaining the stability of membrane permeation, while the strong radial flow works oppositely. In addition, the formation of the filtration cake increases the total membrane filtration resistance but keeps smaller particles from blocking the membrane surface channels, which leads to filtration resistance multiplying rapidly. Hence, the formation of the thick cake, strong axial flow, and weak radial flow is conducive to maintaining permeation flux in order to reduce the replacement of the membrane and improve the period of continuous production.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects on the Performance of Filtration in a Constant-Pressure Stirred Membrane Reactor

Hui

Wang

Mao

et al. 2022

Ind. Eng. Chem. Res.

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“…The potential of the CFD for application in an sMBR is most often realized in hydrodynamic studies, especially concerning membrane fouling and aeration (Tsibranska et al, 2018). Recent studies have reported CFD-combined hydrodynamic and mass transfer simulation of membrane modules with different configuration and stirred sMBRs (Haddadi et al, 2018;Vlaev et al, 2020).…”

Section: Gas Spargingmentioning

confidence: 99%

Anaerobic membrane bioreactors

Stuckey

2024

Anaerobic Treatment of Domestic Wastewater

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Anaerobic membrane bioreactors (AnMBRs) are a recent development in wastewater treatment driven by concerns about energy use and sludge disposal. It separates hydraulic retention time from solid retention time enabling short retention times (as low as 3–6 h, but normally 12–24 h), and excellent performance (85–95% chemical oxygen demand (COD) removal, no effluent solids and high bacterial/virus removal). It produces low-sludge yields (0.04–0.12 g sludge/g CODrem), and methane in both the gas and dissolved in the effluent (lower temperatures yield higher soluble methane). It can be net energy positive depending on its configuration, for example, using ‘dynamic membranes’, mechanically shaken membrane or a two-stage granular activated carbon (GAC) bed reactor. However, membranes ranging from ultrafiltration (0.04 μm) to microfiltration (0.4 μm) foul quite quickly, with Soluble Microbial Products (SMPs)/Extra Cellular Polymers (ECPs-which include extracellular polysaccharides) and cells depositing and growing on the surface. At a certain cell density Quorum Sensing (QS) occurs and there is a rapid increase in trans-membrane pressure (‘TMP jump’). Fouling can be ameliorated by managed gas sparging, mechanical shaking, addition of flocculants/adsorbents, for example, powdered activated carbon, or quorum quenching. Nevertheless, some fouling is important as it enhances membrane performance. Due to the membrane rejecting cells and many low molecular weight solutes, AnMBRs tolerate shock loads and toxins well, and enable microbial adaptation to occur. However, to improve performance more research is needed to minimize overall energy use, explore enhanced performance with bioaugmentation, enhance rates of solid hydrolysis, optimize its performance in the overall flowsheet (global optimization), use life-cycle analysis to reduce its environmental impact, control sulphate reduction and improve post-treatment of effluents to enable water recycling.

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Section: Gas Spargingmentioning

confidence: 99%

Anaerobic Treatment of Domestic Wastewater

2024

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The main challenge in wastewater treatment is changing the perception of wastewater as a waste product to be treated or disposed of, and instead seeing it as a source of energy and other valuable byproducts. This approach is in line with the basic principles of a circular economy, which replaces the ‘end-of-life’ concept with reducing, reusing, recycling, and recovering materials in production, distribution and consumption processes. The anaerobic treatment of wastewater aligns with these goals: energy, safe water and nutrients can all be recovered in the process. As a result, the anaerobic process could represent the best mainstream treatment option for domestic wastewater. The development of powerful technologies such as high-rate and membrane reactors is making anaerobic wastewater treatment more viable, especially in cold and moderate climate regions where the process is made more challenging due to the low process efficiency for dilute streams such as domestic wastewaters. Anaerobic Treatment of Domestic Wastewater: Present Status and Potentialities presents the current state of knowledge and future perspectives of the anaerobic process applied as a mainstream treatment method of domestic wastewater. 12 chapters cover engineering, microbiology, process monitoring and control, sustainability, life-cycle assessment, and techno-economic analysis. Topical areas of research, including the fate of microplastics and antibiotic resistance in the treatment line, are also discussed. This book provides all the necessary knowledge to analyse, evaluate, design, and implement anaerobic bioreactors for domestic wastewater treatment, making it essential reading for doctoral and master's students of water treatment subjects, and professionals or researchers in the water sector.

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CFD evaluation of mass transfer distribution heterogeneity along the membrane-liquid interface in stirred submerged membrane bioreactors

Cited by 7 publications

References 49 publications

Effects on the Performance of Filtration in a Constant-Pressure Stirred Membrane Reactor

Effects on the Performance of Filtration in a Constant-Pressure Stirred Membrane Reactor

Anaerobic membrane bioreactors

Anaerobic Treatment of Domestic Wastewater

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