2021
DOI: 10.1016/j.memsci.2020.118636
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Simulation of composition and mass transfer behaviour of a membrane biofilm reactor using a two dimensional multi-species counter-diffusion model

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Cited by 15 publications
(7 citation statements)
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“…Therefore, a more activated stress response was expected from Acinetobacter and Pseudomonas, generally in the EPS formation mediated by acyl homoserine lactones, ,, which was presented by a higher abundance and centrality of bin 9 than in the SMX group (Figure ). The increase in stress behavior might significantly promote filamentous microorganism proliferation , and further strengthen the filamentous and homogeneous characteristics of the biofilm structure, supported by the significantly higher abundance of Actinobacteria (typical filamentous microorganisms) and Flavobacterium (the dominant genus in homogeneous biofilms) in the CBZ group , than in the SMX groups (Figure S6). Dominated by the crossflow mode, the filamentous structure further weakened CBZ transfer to the deeper layers of the biofilm as revealed by the flow-field prediction models, , thereby restricting the effect of CBZ primarily to the outer layers of the biofilm and negligibly inhibiting the development and maturation (characterized by HD) of the entire biofilm (Figure b).…”
Section: Resultsmentioning
confidence: 99%
“…Therefore, a more activated stress response was expected from Acinetobacter and Pseudomonas, generally in the EPS formation mediated by acyl homoserine lactones, ,, which was presented by a higher abundance and centrality of bin 9 than in the SMX group (Figure ). The increase in stress behavior might significantly promote filamentous microorganism proliferation , and further strengthen the filamentous and homogeneous characteristics of the biofilm structure, supported by the significantly higher abundance of Actinobacteria (typical filamentous microorganisms) and Flavobacterium (the dominant genus in homogeneous biofilms) in the CBZ group , than in the SMX groups (Figure S6). Dominated by the crossflow mode, the filamentous structure further weakened CBZ transfer to the deeper layers of the biofilm as revealed by the flow-field prediction models, , thereby restricting the effect of CBZ primarily to the outer layers of the biofilm and negligibly inhibiting the development and maturation (characterized by HD) of the entire biofilm (Figure b).…”
Section: Resultsmentioning
confidence: 99%
“…To solve the PDE system (2.1) numerically, appropriate boundary conditions must be defined. As the considered computational domain is a small part of a continuously repeating larger domain, we define the homogeneous Neumann condition for all dependent variables at the lateral boundaries, x = 0, L, to preserve the continuity [19]. To describe the involved counter-diffusion mechanism, we assume oxygen is provided through the membrane placed at the bottom boundary, y = 0, and organic and inorganic nitrogen sources are added through the top segment of the computational domain, y = H. Hence, a nonhomogeneous Robin condition is imposed for oxygen at y = 0 and for ammonium and acetate at y = H. The homogeneous Neumann condition is defined for nitrogen sources at the bottom boundary to reflect a hydrophobic membrane which does not permit these substances to diffuse through the membrane.…”
Section: Computational Simulationmentioning
confidence: 99%
“…At t = 150, HB is formed in the outer surface where the concentration of acetate t=150 t=300 is higher and oxygen is not limited while oxygen depletion and consumption of acetate by AHB inhibit formation of HB at t = 300. It has been shown in [19,20] that initial arrangement of individual colonies changes the internal structure of the biofilm and spatial distribution of substrates nevertheless its effect on nitrification and denitrification is not considerable. To investigate whether formation of inert biomass is affected by initial inoculation of the substratum, we study development of biofilm with initial sparse inoculation (that needs a 2D modeling approach to be described) and plot snapshots of biofilm development and substrate distribution in Figures 5-6.…”
Section: 1mentioning
confidence: 99%
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“…These reduced cytochromes exist as a gradient across the biofilm, which is consistent with previous literature examining long-distance electron transfer by G. sulfurreducens (Liu & Bond, 2012 ). Other recent efforts to develop models of biofilm dynamics include mass transfer modeling in membrane biofilm reactors for wastewater treatment (Ghasemi et al, 2021 ), microalgal biofilm growth on photobioreactors (Huang et al, 2021 ), and multispecies oral biofilm development (Martin et al, 2017 ). In this vein, developing and validating models in other contexts will lead to improved reactor design.…”
Section: Remaining Questions and Challengesmentioning
confidence: 99%