Influence of the flow velocity on membrane-aerated biofilm reactors: Application of a rotating disk for local flow control

Shoji, Tadashi; Itoh, Ryuya; Nittami, Tadashi; Kageyama, Tatsuto; Noguchi, Michihiko; Yamasaki, A.

doi:10.1016/j.bej.2020.107771

Cited by 12 publications

(3 citation statements)

References 49 publications

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“…Higher bulk ammonia concentrations are needed to transfer the same ammonia flux that matches the oxygen supply. Similar results were reported in other studies (Shoji et al 2020;Chen et al 2021;Elsayed et al 2021;Pérez-Calleja et al 2022).…”

Section: Effect Of Liquid-biofilm Boundary Layer Thickness (Zbl)supporting

confidence: 92%

Available online sensors can be used to create fingerprints for MABRs that characterize biofilm limiting conditions and serve as soft sensors

Yang

Houweling

2022

Water Science and Technology

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Membrane aerated biofilm reactors (MABRs) are a promising biological wastewater treatment technology, whose industrial applications have dramatically accelerated in the recent five years. Increasing popularity and fast industrial adaptation are coupled with increased needs to monitor, optimize and control MABRs with available online sensors. Observations of commercial scale MABR installations have shown a distinctive and repetitive pattern relating oxygen purity in MABR exhaust gas to reactor ammonia concentrations. This provides an obvious opportunity for process monitoring and control which this paper investigates with the help of modelling. The relationship plots between the bulk ammonia concentration and the oxygen purity are defined as MABR fingerprint plots, which are described in the form of steady-state curves and dynamic trajectories. This study systematically investigated, analyzed and explained the behaviors and connections of steady-state curves and dynamic trajectories with a MABR model in SUMO®, and proposed a hypothesis about utilizing the MABR fingerprint plots to characterize MABR system performance, identify the limiting factor of biofilms and possibly develop a soft senor for MABR biofilm thickness monitoring and control.

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Section: Effect Of Liquid-biofilm Boundary Layer Thickness (Zbl)supporting

confidence: 92%

Available online sensors can be used to create fingerprints for MABRs that characterize biofilm limiting conditions and serve as soft sensors

Yang

Houweling

2022

Water Science and Technology

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“…Diffusion boundary layer thickness is reduced with increased liquid flow velocity, and biofilm detachment accelerates. As a result, the thinner diffusion boundary layer enhances the external mass transfer rate, providing higher overall removal rates (Shoji et al 2020). However, in a previous tracer experiment (Castrillo et al 2019), high flow velocities resulted in a non-optimal flow pattern, allowing no further enhancement of mass transfer.…”

Section: External Mass Transfermentioning

confidence: 96%

Recent progress using membrane aerated biofilm reactors for wastewater treatment

Wagner

Carlson

et al. 2021

Water Science and Technology

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The membrane biofilm reactor (MBfR), which is based on the counter diffusion of the electron donors and acceptors into the biofilm, represents a novel technology for wastewater treatment. When process air or oxygen is supplied, the MBfR is known as the membrane aerated biofilm reactor (MABR), which has high oxygen transfer rate and efficiency, promoting microbial growth and activity within the biofilm. Over the past few decades, lab-scale studies have helped researchers and practitioners understand the relevance of influencing factors and biological transformations in MABRs. In recent years, pilot- to full-scale installations are increasing along with process modeling. The resulting accumulated knowledge has greatly improved understanding of the counter-diffusional biological process, with new challenges and opportunities arising. Therefore, it is crucial to provide new insights by conducting this review. This paper reviews wastewater treatment advancements using MABR technology, including design and operational considerations, microbial community ecology, and process modeling. Treatment performance of pilot- to full-scale MABRs for process intensification in existing facilities is assessed. This paper also reviews other emerging applications of MABRs, including sulfur recovery, industrial wastewater, and xenobiotics bioremediation, space-based wastewater treatment, and autotrophic nitrogen removal. In conclusion, commercial applications demonstrate that MABR technology is beneficial for pollutants (COD, N, P, xenobiotics) removal, resource recovery (e.g., sulfur), and N2O mitigation. Further research is needed to increase packing density while retaining efficient external mass transfer, understand the microbial interactions occurring, address existing assumptions to improve process modeling and control, and optimize the operational conditions with site-specific considerations.

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“…The safety of water resources and tap water are directly related to the life and health of human beings (Shoji et al 2020). Since the distribution and transportation of living water is highly depended on the water supply networks and distribution systems, the security and stability of them are of great importance.…”

Section: Introductionmentioning

confidence: 99%

Effect of particulate matter on biofilm stability in water supply network

Zhao

Wang

et al. 2023

Preprint

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The safety of water supply network has always been a concern. The biofilm attached on the pipes will fall into pipe-water under the disturbance, which becomes a potential threat towards human health. Particulate matter can provide shelter for bacteria, and most bacteria in water will adhere to the surface of it, which is not easy to be killed by disinfectants. Therefore, the effect caused by particulate matters and extracellular polymer (EPS) on the stability of biofilm was investigated. This study revealed that the biofilms without particulate matters showed the highest biomass, that’s an order of magnitude more than have particulate matter bacteria, while those with abundant particulate matters and bacteria were more stable. The effect of shear stress towards the biofilm attached on the pipes was investigated through rotational speed experiments, and the results implied that the collision between bacterial polymers increased with the increasing of rotational speed, simultaneously with the formation of stale biofilm adhered inside the pipes. Besides, instead of protein and fatty chains, the hydroxyl bonds played vital roles during the combination of particulate matters and EPS.

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Influence of the flow velocity on membrane-aerated biofilm reactors: Application of a rotating disk for local flow control

Cited by 12 publications

References 49 publications

Available online sensors can be used to create fingerprints for MABRs that characterize biofilm limiting conditions and serve as soft sensors

Available online sensors can be used to create fingerprints for MABRs that characterize biofilm limiting conditions and serve as soft sensors

Recent progress using membrane aerated biofilm reactors for wastewater treatment

Effect of particulate matter on biofilm stability in water supply network

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