Influences of dissolved oxygen concentration on biocathodic microbial communities in microbial fuel cells

Rago, Laura; Cristiani, Pierangela; Villa, Federica; Zecchin, Sarah; Colombo, Alessandra; Cavalca, L.; Schievano, Andrea

doi:10.1016/j.bioelechem.2017.04.001

Cited by 111 publications

(62 citation statements)

References 71 publications

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“…The decreasing phenomenon of DO in the cathode of the MFCs might be because of the reduction reaction, where the oxygen is used for the production of water as end product. The higher the oxygen reduced (less DO), the better will be the power production of the MFC . So according to this substantiation, anaerobic SMFC had the minimum cathode DO of 3.4 ppm compared to 3.6 ppm in activated sludge SMFC and control revealing the reason for its enhanced performance.…”

Section: Resultsmentioning

confidence: 59%

Sludge selection on the performance of sediment microbial fuel cells

et al. 2018

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Summary Sediment microbial fuel cells (SMFCs) are being constructed and operated to produce renewable power for remote monitoring. They are highly advantageous than typical MFCs. In this study, 2 kinds of sludge (activated sludge and anaerobic sludge) were used in SMFCs for investigating their performance characteristics such as the power density production and chemical oxygen demand (COD) removal. The performance of the SMFC with anaerobic sludge was found to be better than that of activated sludge. Experimental results revealed that the maximum power density and COD removal were reported in anaerobic sludge SMFC (10.36 mW/m2, 62%) and the activated sludge SMFC produced 3.97 mW/m2, with a COD removal of 58.2%. The dissolved oxygen values for activated and anaerobic sludge were 3.45 and 0.75 ppm respectively. Control SMFC was run without sediment, and its performance was inferior compared to the SCMFCs with sludge. Generally, the anaerobic SMFC had 2.52 times better power density production than the activated SMFC and control. Moreover, the COD removal was 19% higher than the control. Results concluded that the selection of sludge plays an important role in the SMFC performance. The findings of this study will be useful for the practical applications of SMFCs in real wastewater treatment plants and energy production in the future.

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Section: Resultsmentioning

confidence: 59%

Sludge selection on the performance of sediment microbial fuel cells

et al. 2018

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“…From Figure 7, the Bacteroidetes phylum was the second dominant microorganism in MFCs; it was present the most in A1 (30%) and the least in A3 (19%). The presence of Bacteroidetes was previously reported in fermentative bioelectrochemical biofilms due to their ability to biodegrade polymeric proteins and carbohydrates [44,45]. The Firmicutes phylum was often retrieved in bioelectrochemical systems, associated with the electrogenic activity.…”

Section: High-throughput Sequencing and Microbial Community Analysismentioning

confidence: 88%

Adding Zero-Valent Iron to Enhance Electricity Generation during MFC Start-Up

Zhou

He³

et al. 2020

IJERPH

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The low power generation efficiency of microbial fuel cells (MFCs) is always a barrier to further development. An attempt to enhance the start-up and electricity generation of MFCs was investigated by adding different doses of zero-valent iron into anaerobic anode chambers in this study. The results showed that the voltage (289.6 mV) of A2 with 0.5 g of zero-valent iron added was higher than the reference reactor (197.1 mV) without dosing zero-valent iron (A4). The maximum power density of 27.3 mW/m2 was obtained in A2. CV analysis demonstrated that A2 possessed a higher oxidation–reduction potential, hence showing a stronger oxidizing property. Meanwhile, electrochemical impedance analysis (EIS) also manifested that values of RCT of carbon felts with zero-valent iron supplemented (0.01–0.03 Ω) were generally lower. What is more, SEM images further proved and illustrated that A2 had compact and dense meshes with a hierarchical structure rather than a relatively looser biofilm in the other reactors. High-throughput sequencing analysis also indicated that zero-valent iron increased the abundance of some functional microbial communities, such as Acinetobacter, Ignavibacteriales, Shewanella, etc.

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“…These values are higher than the working voltage (12-170 mV) from a photosynthetic algal MFC fed with food waste [9] or domestic wastewater [23]. The maximum values, rather than the average values for the parameters relative to electricity generation (e.g., working voltage, open circuit voltage/potential, current density), have traditionally been used in most studies [8][9][10]12,13]. Because those parameters vary remarkably with the change in DO caused by the different growth status of microalgae in the microalgae biocathode; for example, DO is usually very low in the start-up period or after replacement of the substrate in cathode chamber [9,10,12] and easily fluctuates with the shift in light/dark periods [8,12].…”

Section: Effect Of the Proportion Of Cathode Electrode Submerged On Wmentioning

confidence: 99%

“…Many studies have demonstrated that the bioelectricity generation was correlated with oxygen availability in the cathode as O 2 is the electron acceptor [8][9][10]. Due to the high DO generated from photosynthesis, power generation of MFC with microalgae biocathode was reported to be higher than that of MFC with mechanical aeration cathode [8,11], abiotic-cathode, or air-cathode [12,13].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Stability of Microalgae Biocathode by a Partially Submerged Carbon Cloth Electrode for Bioenergy Production from Wastewater

Ling

et al. 2019

Energies

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The electricity output from microbial fuel cell (MFC) with a microalgae assisted cathode is usually higher than that with an air cathode. The output of electricity from a photosynthetic microalgae MFC was positively correlated with the dissolved oxygen (DO) level in the microalgae assisted biocathode. However, DO is highly affected by the photosynthesis of microalgae, leading to the low stability in the electricity output that easily varies with the change in microalgae growth. In this study, to improve the electricity output stability of the MFC, a partially submerged carbon cloth cathode electrode was first investigated to use oxygen from both microalgae and air, with synthetic piggery wastewater used as the anolyte and anaerobically digested swine wastewater as the catholyte. When the DO levels dropped from 13.6–14.8 to 1.0–1.6 mg/L, the working voltages in the MFCs with partially submerged electrodes remained high (256–239 mV), whereas that for the conventional completely submerged electrodes dropped from 259 to 102 mV. The working voltages (average, 297 ± 26 mV) of the MFCs with the 50% submerged electrodes were significantly (p < 0.05) higher than with other partially or completely submerged electrodes. The associated maximum lipid production from wastewater was 250 ± 42 mg/L with lipid content of 41 ± 6% dry biomass. Although the partially submerged electrode had no significant effects on lipid production or nitrogen removal in wastewater, there was significant improvement in the stability of the electricity generated under variable conditions.

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Influences of dissolved oxygen concentration on biocathodic microbial communities in microbial fuel cells

Cited by 111 publications

References 71 publications

Sludge selection on the performance of sediment microbial fuel cells

Sludge selection on the performance of sediment microbial fuel cells

Adding Zero-Valent Iron to Enhance Electricity Generation during MFC Start-Up

Enhancing Stability of Microalgae Biocathode by a Partially Submerged Carbon Cloth Electrode for Bioenergy Production from Wastewater

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