MABR process development downstream of a carbon redirection unit: opportunities and challenges in nitrogen removal processes

Mehrabi, Sadaf; Houweling, Dwight; Dagnew, Martha

doi:10.1080/09593330.2022.2079998

Cited by 6 publications

(2 citation statements)

References 47 publications

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“…Such contradictions can be alleviated to some extent by the increase in biofilm thickness and controlling C:N ratio in proper ranges, thanking to the counter-diffusion mass transport mechanisms in MABR. In addition, some operation strategies like intermittent aeration, are applied in MABR operation to enhance SND with MABR [4,36,39] which is indeed one of our future works.…”

Section: Discussionmentioning

confidence: 99%

Unraveling the role of inert biomass in membrane aerated biofilm reactors for simultaneous nitrification and denitrification

Ghasemi,

Chang,

Sivaloganathan

2024

Math Appl Sci Eng

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This study presents an innovative 2D spatio-temporal model that sheds light on the intricate formation of biofilms, incorporating two essential biomass decay pathways: cell lysis and endogenous respiration. The model encompasses heterotrophic bacteria (HB), anaerobic heterotrophic bacteria (AHB), and autotrophic bacteria (AB), offering a comprehensive understanding of multi-species biofilm development. Through meticulous simulations, we explore the primary mechanisms behind inert biomass formation in biofilms, revealing the key roles played by the lysis of HB, AHB, and AB, as well as the endogenous respiration of HB. Moreover, the simulations reveal how species of higher abundance contribute significantly to inert biomass generation, reshaping our understanding of biofilm dynamics. Crucially, this study highlights the indispensability of considering biofilm inert biomass when modeling the nitrification and denitrification behaviors of a membrane aerated biofilm reactor (MABR). The distribution of oxygen and acetate across biofilm thickness is remarkably different when inert biomass is factored in, underscoring the necessity for a more holistic approach to modeling biofilm behavior. With the introduction of the inert biomass inclusive biofilm model, our simulations explore the interactive effects of key process conditions - bulk concentrations of oxygen ($O_{\infty}$), ammonium nitrogen ($N_{1\infty}$), acetate ($A_{\infty}$), and biofilm thickness - on the nitrification and denitrification performance of MABR. A compelling correlation emerges between higher bulk concentrations of oxygen and ammonium nitrogen and optimal nitrification rates, achieving an impressive range of 0.3 to 1.1 g ammonium/$m^{2}/d. Delving into denitrification, we observe that high $O_{\infty}$, low $N_{1\infty}$, and either high or low $A_{\infty}$ levels impede AHB formation and consequently hinder denitrification. Our findings provide a roadmap for achieving simultaneous nitrification and denitrification, contingent on specific conditions: $10[gm^{-3}] < O_{\infty} < 15[gm^{-3}]$, $12[gm^{-3}] < N_{1\infty} < 20[gm^{-3}]$, $A_{\infty}$ ranging from $3[gm^{-3}]$ to $12[gm^{-3}]$, and a biofilm thickness $> 1.4[mm]$. While our study reveals promising avenues for simultaneous nitrification and denitrification, denitrification rates still lag behind nitrification rates under the same conditions. As a result, we advocate for further investigations to devise strategies that can enhance denitrification in MABR systems. In conclusion, this study advances our knowledge of biofilm dynamics by introducing a comprehensive model and illuminating the key factors driving nitrification and denitrification performance in MABRs. These findings pave the way for improved biofilm engineering and wastewater treatment strategies, opening new horizons for sustainable environmental practices.

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Section: Discussionmentioning

confidence: 99%

Unraveling the role of inert biomass in membrane aerated biofilm reactors for simultaneous nitrification and denitrification

Ghasemi,

Chang,

Sivaloganathan

2024

Math Appl Sci Eng

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“…13 Benefiting from aeration flexibility via adjusting pressure or flowrate, MAB can achieve nitrification only or simultaneous nitrification and denitrification. [14][15][16] High dissolved oxygen concentrations facilitate NOB growth in MAB, thus limiting stable nitritation. Recent studies on the pilot and full scale application of MAB for municipal wastewater treatment, [16][17][18] where aeration membrane modules were directly submerged into the anoxic tank of the anaerobic-anoxic-oxic activated sludge process, demonstrated that MAB could achieve full nitrification with an oxygen utilization efficiency of more than 80% and denitrifying bacteria in activated sludge could achieve full denitrification at the same time, thus eliminating internal reflux for denitrification.…”

Section: Introductionmentioning

confidence: 99%

Low strength and COD/N wastewater treatment via controlled nitrification by a membrane aerated biofilm, partial denitrification by activated sludge, and anaerobic ammonia oxidation by granular sludge

Rong

Jiang

Luo³

et al. 2023

Environ. Sci.: Water Res. Technol.

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Exploring Aeration Strategies for Enhanced Simultaneous Nitrification and Denitrification in Membrane Aerated Bioreactors: A Computational Approach

Ghasemi,

Chang,

Sivaloganathan

2024

Bull Math Biol

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MABR process development downstream of a carbon redirection unit: opportunities and challenges in nitrogen removal processes

Cited by 6 publications

References 47 publications

Unraveling the role of inert biomass in membrane aerated biofilm reactors for simultaneous nitrification and denitrification

Unraveling the role of inert biomass in membrane aerated biofilm reactors for simultaneous nitrification and denitrification

Low strength and COD/N wastewater treatment via controlled nitrification by a membrane aerated biofilm, partial denitrification by activated sludge, and anaerobic ammonia oxidation by granular sludge

Exploring Aeration Strategies for Enhanced Simultaneous Nitrification and Denitrification in Membrane Aerated Bioreactors: A Computational Approach

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