Biofilm re-vitalization using hydrodynamic shear stress for stable power generation in microbial fuel cell

Microbial community diversity changes during voltage reversal repair in a 12-unit microbial fuel cell

“…On the other hand, biofilms appeared to recover with time when enforcing less frequent circuit interruptions (e.g., days 0-28, 30-38 and 42-58, see Fig. 3), as compared to earlier more frequent interruptions (weeks leading up to the incident [19] starting in this work with days 0-2 (Fig. 2A) before irreversible voltage reversal actually occurred on day 3 (Fig.…”

“…MFC-Stacks are also often plagued with multiple voltage oscillations unrelated to the previously described obvious voltage reversals. These may arise from non-constant feeding [17], bioturbation by aquatic life within benthic MFC stacks [18] and degrading biofilms [19]. In addition, very small imbalances perceived as voltage oscillations was previously observed at all possible potential levels [20].…”

On-Line Monitoring of Biofilm Accumulation on Graphite-Polypropylene Electrode Material Using a Heat Transfer Sensor

“…Ge and He [ 42 ] have investigated the long-term performance of MFCs with wastewater and reported an unstable and deteriorating performance. To stabilize the MFC performance Islam and coworkers have therefore applied two different biofilm control mechanisms in microbial fuels cells with ultrasound [ 43 ] or with flushing [ 44 ] in order to control the biofilm thicknesses accumulated on the electrodes. The herein described sensor can be used as a trigger for the application biofilm control mechanisms.…”

Enhancing the anode performance of microbial fuel cells in the treatment of oil-based drill sludge by adjusting the stirring rate and supplementing oil-based drill cuttings

“…To overcome the harmful effects of low interaction e ciency between bacteria and anode material, studies have shown that high shear rates (below the tensile strength level) lead to stronger microbial aggregation and more compact bacterial colony structures (Jones &Buie 2019, Pham et al 2008, Pinck et al 2020. High shear can be realized by prolonging hydraulic retention times (Gao et al 2019), rotating anode electrodes (Pan et al 2019) and applying agitation to the cathode chamber (Islam et al 2019). For instance, it has been reported that the power and current densities of polydimethylsiloxane (PDMS)-based microscale MFCs increase with increasing ow rate and that maximum power densities and current densities were 0.71 mW/m 2 and 1.8 mA/m 2 , respectively, which higher than that were realized by previous PDMS-based micro MFCs (Yoon et al 2018).…”