Studying the Impact of Wall Shear Stress on the Development and Performance of Electrochemically Active Biofilms

Moß, Christopher; Jarmatz, Niklas; Hartig, Dave; Schnöing, Lukas; Scholl, Stephan; Schröder, Uwe

doi:10.1002/cplu.202000544

Cited by 8 publications

(6 citation statements)

References 73 publications

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“…[28] It is also doubtful that the observed voltage loss was due to EAB erosion because the shear stress was only (0.5 mPa) at the flow rates until this point, which is well below the values used in previous work. [23,29] The microfluidic MFC was also designed to prevent O2 contamination and ferricyanide crossover to the anolyte flow stream, but we do not rule out accidental contamination during syringe replacement or from slow O2 leaks through faults in the device gas-protection layer, fluid connects or even through the porous graphite electrodes. Other possibilities include biological contamination and metabolically inactive outer layers, as recently reported.…”

Section: Experimental Timeline (Transition To Compromised Performance and Hydrodynamic Interventions)mentioning

confidence: 99%

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Microbial fuel cell power overshoot studied with microfluidics: from quantification to elimination

Amirdehi

Gong

Khodaparastasgarabad

et al. 2021

Preprint

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Power overshoot can hinder determination of maximum power densities in microbial fuel cells (MFCs). In this work, a microfluidic approach was used to study overshoot in an MFC containing a pure culture of electroactive biofilms (EAB) containing Geobacter sulfurreducens. After 1-month operation under constant flow of an ideal nutrient medium, the MFC health began to degrade, marked by voltage loss and the appearance of anomalies in the power density curves. One such anomaly was a chronic power overshoot, accompanying a loss of both measured power and current density on the high-current side of the power density curve. The degree of power overshoot was quantified while certain flow-based interventions were applied, notably the shear erosion of the EAB outer layer. Next, two approaches to acclimation were demonstrated to treat the remaining overshoot. The standard approach, which acclimates the MFC to high currents before a standard polarization test, eliminated the remaining overshoot and returned maximum power densities to initial levels, but maximum current density remained lower than the initial level. A microfluidic-assisted “long-hold polarization test” enabled efficient in situ acclimation of each external resistor during the measurement. Despite the health-compromised MFC, this method provided long-term stability during the polarization test, resulting in power and current density measurements that exceeded those made on the healthy MFC using the standard polarization test. We conclude that slower electron transfer kinetics in unhealthy MFCs can provoke overshoot by prolonging the time to reach steady state during the polarization test, but a properly designed measurement overcomes this problem.

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Section: Experimental Timeline (Transition To Compromised Performance and Hydrodynamic Interventions)mentioning

confidence: 99%

“…[39] This may reflect amplified stresses, e.g., those due to flow-enhanced transport of low concentration O2 in solution to the EAB, as other literature examples typically show an increase to power with flow. [29,40]…”

Section: The Role Of Polarization Test Stability In Measurements Featuring Power Overshootmentioning

confidence: 99%

Microbial fuel cell power overshoot studied with microfluidics: from quantification to elimination

Amirdehi

Gong

Khodaparastasgarabad

et al. 2021

Preprint

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“…In addition, predictable experimental conditions make the microfluidic format ideal for numerical modeling, [12][13][14] which often complements and extrapolates from experimental studies. 9,[15][16][17] Following the reductive approach in successful application of microfluidics to other fields (e.g., organ-on-a-chip, microfluidic bioreactors, etc. ), microfluidic MFCs should aim to maximize simplicity in design and operation in order to focus on essential features or mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Optimized design and protocols eliminate power density gap between microbial fuel cells at different scales

Khodaparastasgarabad

Sonowane

Gong

et al. 2023

Preprint

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In addition to offering a promising approach for niche applications in environmental sensing and portable power sources, microfluidic microbial fuel cells (MFCs) can also accelerate the development of mainstream energy applications through studies into fundamental mechanisms and optimization, without complications from nutrient cycling, membrane fouling, or uncontrollable concentration gradients. However, the main hurdle in leveraging microfluidic MFCs for discovery and optimization is their underperformance compared to macrosystems on certain key metrics, notably area-normalized power. To bridge this gap, we showcase a strategy that focuses on (i) technology improvements, (ii) establishment of new performance benchmarks, and (iii) presentation of a universally applicable normalization method for direct comparisons across all MFC scales and that complements areal power densities. Using a pure-culture Geobacter sulfurreducens electroactive biofilm (EAB) applied to a new system that adheres to the strategy above, we observed optimal anode colonization, resulting in the highest recorded power density for a microfluidic MFC of 3.88 W m-2 (24.37 kW m-3) and a normalized energy recovery (0.21 kWh m-3) that nearly matches the average value observed in macrosystems. With these results, the performance gap between micro- and macroscale MFCs is closed, and a road map to move forward is presented.

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“…Keeping in mind, Orlu et al [32] described the study on the fluctuating wall shear stress in zero pressure-gradient turbulent boundary layers flow. Recently, Mob et al [33] present a paper in which they describe the study of the impact of wall-shear stress on the evolution and execution of electrochemically alive biofilm. The author referred to some recent contributions in the field [34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Wall Shear Stress on Two Phase Fluctuating Flow of Dusty Fluids by Using Light Hill Technique

Khan

Rahman

Ali

et al. 2021

Water

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Due to the importance of wall shear stress effect and dust fluid in daily life fluid problems. This paper aims to discover the influence of wall shear stress on dust fluids of fluctuating flow. The flow is considered between two parallel plates that are non-conducting. Due to the transformation of heat, the fluid flow is generated. We consider every dust particle having spherical uniformly disperse in the base fluid. The perturb solution is obtained by applying the Poincare-Lighthill perturbation technique (PLPT). The fluid velocity and shear stress are discussed for the different parameters like Grashof number, magnetic parameter, radiation parameter, and dusty fluid parameter. Graphical results for fluid and dust particles are plotted through Mathcad-15. The behavior of base fluid and dusty fluid is matching for different embedded parameters.

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Studying the Impact of Wall Shear Stress on the Development and Performance of Electrochemically Active Biofilms

Cited by 8 publications

References 73 publications

Microbial fuel cell power overshoot studied with microfluidics: from quantification to elimination

Microbial fuel cell power overshoot studied with microfluidics: from quantification to elimination

Optimized design and protocols eliminate power density gap between microbial fuel cells at different scales

The Effect of Wall Shear Stress on Two Phase Fluctuating Flow of Dusty Fluids by Using Light Hill Technique

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