Cathodic biofouling control by microbial separators in air-breathing microbial fuel cells

Li, Chao; Yi, Kexin; Hu, Sujuan; Yang, Wulin

doi:10.1016/j.ese.2023.100251

Cited by 23 publications

(20 citation statements)

References 67 publications

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“…To reveal how the cathode potential tuned the microbial community composition, high-throughput sequencing was conducted at the end of the stable operation. The coverage values reached more than 0.99, indicating that most of the species had been well sequenced . Compared with the gaps among experimental groups (Bio-OCP, Bio-0.8 V, and Bio-1.0 V), the replicative samples distributed closely according to the principal component analysis (PCA) (Figure S15a), indicating their smaller difference in the microbial community structure.…”

Section: Resultsmentioning

confidence: 99%

“…The coverage values reached more than 0.99, indicating that most of the species had been well sequenced. 33 Compared with the gaps among experimental groups (Bio-OCP, Bio-0.8 V, and Bio-1.0 V), the replicative samples distributed closely according to the principal component analysis (PCA) (Figure S15a), indicating their smaller difference in the microbial community structure. Consistent with this, analysis of similarities (ANOSIM) also revealed smaller differences in the replicative than in experimental groups (R = 0.3004, P = 0.004) (Figure S15b), indicative of a crucial impact of cathodic potential on the microbial community structure.…”

Section: ■ Introductionmentioning

confidence: 99%

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Insights into the Electron Transfer Behaviors of a Biocathode Regulated by Cathode Potentials in Microbial Electrosynthesis Cells for Biogas Upgrading

Tian

Liang

et al. 2023

Environ. Sci. Technol.

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Bioelectrochemical-based biogas upgrading is a promising technology for the storage of renewable energy and reduction of the global greenhouse gas emissions. Understanding the electron transfer behavior between the electrodes and biofilm is crucial for the development of this technology. Herein, the electron transfer pathway of the biofilm and its catalytic capability that responded to the cathode potential during the electromethanogenesis process were investigated. The result suggested that the dominant electron transfer pathway shifted from a direct (DET) to indirect (IDET) way when decreasing the cathode potential from −0.8 V (Bio-0.8 V) to −1.0 V (Bio-1.0 V) referred to Ag/AgCl. More IDET-related redox substances and high content of hydrogenotrophic methanogens (91.9%) were observed at Bio-1.0 V, while more DET-related redox substances and methanogens (82.3%) were detected at Bio-0.8 V. H 2 , as an important electron mediator, contributed to the electromethanogenesis up to 72.9% of total CH 4 yield at Bio-1.0 V but only ∼17.3% at Bio-0.8 V. Much higher biogas upgrading performance in terms of CH 4 production rate, final CH 4 content, and carbon conversion rate was obtained with Bio-1.0 V. This study provides insight into the electron transfer pathway in the mixed culture constructed biofilm for biogas upgrading.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Insights into the Electron Transfer Behaviors of a Biocathode Regulated by Cathode Potentials in Microbial Electrosynthesis Cells for Biogas Upgrading

Tian

Liang

et al. 2023

Environ. Sci. Technol.

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“…At the start-up period, the anodes were inoculated with the effluent of MFCs that had been operated for more than half a year. During long-term operation, all reactors were fed with a medium composed of 1.0 g L –1 anhydrous sodium acetate (NaAc), 50 mM PBS, 12.5 mL L –1 trace minerals, and 5 mL L –1 vitamin solutions for more than half a year . During experiments, a stepwise reducing external resistance method (510, 200, and 100 Ω) was applied to culture EBs, and a constant resistor (200 Ω) was used as the external loading for long-term MFC operation.…”

Section: Methodsmentioning

confidence: 99%

Insight into the Pseudocapacitive Behavior of Electroactive Biofilms in Response to Dynamic-Controlled Electron Transfer and Metabolism Kinetics for Current Generation in Water Treatment

Li,

Hu,

et al. 2023

Environ. Sci. Technol.

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“…A new "air cathode and biotic separator" assembly was applied in an air cathode MFC, which largely eliminated biofouling in the cathode and enabled long-term sustainability of the air cathode. 58 Thus, biotic separators undoubtedly go beyond the functions of traditional abiotic separators (Figure 2b).…”

Section: Efficiency and Performance Of Biotic Separators In Mfcs 231 ...mentioning

confidence: 99%

“…Operating techniques, such as biofilm activity regulation, aeration strategy, and hydraulic flow modes, are also accepted for long-term stability. 17,58,145,146 In general, MFC devices have already achieved a low capital cost, a high efficiency, and long-term stability for practical applications.…”

Section: Cost Efficiency and Stability Of Pilot-scale Mfcsmentioning

confidence: 99%

Sorting Out the Latest Advances in Separators and Pilot-Scale Microbial Electrochemical Systems for Wastewater Treatment: Concomitant Development, Practical Application, and Future Perspective

Li,

Liang,

Tian

et al. 2024

Environ. Sci. Technol.

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To date, dozens of pilot-scale microbial fuel cell (MFC) devices have been successfully developed worldwide for treating various types of wastewater. The availability and configurations of separators are determining factors for the economic feasibility, efficiency, sustainability, and operability of these devices. Thus, the concomitant advances between the separators and pilot-scale MFC configurations deserve further clarification. The analysis of separator configurations has shown that their evolution proceeds as follows: from ion-selective to ion-non-selective, from nonpermeable to permeable, and from abiotic to biotic. Meanwhile, their cost is decreasing and their availability is increasing. Notably, the novel MFCs configured with biotic separators are superior to those configured with abiotic separators in terms of wastewater treatment efficiency and capital cost. Herein, a highly comprehensive review of pilot-scale MFCs (>100 L) has been conducted, and we conclude that the intensive stack of the liquid cathode configuration is more advantageous when wastewater treatment is the highest priority. The use of permeable biotic separators ensures hydrodynamic continuity within the MFCs and simplifies reactor configuration and operation. In addition, a systemic comparison is conducted between pilot-scale MFC devices and conventional decentralized wastewater treatment processes. MFCs showed comparable cost, higher efficiency, long-term stability, and significant superiority in carbon emission reduction. The development of separators has greatly contributed to the availability and usability of MFCs, which will play an important role in various wastewater treatment scenarios in the future.

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Cathodic biofouling control by microbial separators in air-breathing microbial fuel cells

Cited by 23 publications

References 67 publications

Insights into the Electron Transfer Behaviors of a Biocathode Regulated by Cathode Potentials in Microbial Electrosynthesis Cells for Biogas Upgrading

Insights into the Electron Transfer Behaviors of a Biocathode Regulated by Cathode Potentials in Microbial Electrosynthesis Cells for Biogas Upgrading

Insight into the Pseudocapacitive Behavior of Electroactive Biofilms in Response to Dynamic-Controlled Electron Transfer and Metabolism Kinetics for Current Generation in Water Treatment

Sorting Out the Latest Advances in Separators and Pilot-Scale Microbial Electrochemical Systems for Wastewater Treatment: Concomitant Development, Practical Application, and Future Perspective

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