Accelerating anaerobic digestion process with novel single chamber microbial electrochemical systems with baffle

Nguyen, Huong Thi Thu; Noori, Md. T.; Min, Booki

doi:10.1016/j.biortech.2022.127474

Cited by 17 publications

(7 citation statements)

References 45 publications

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“…[ 10,11 ] Autotrophic electroactive methanogens at the cathode utilize the electrons to synergistically enrich methane by in situ conversion of access CO 2 into methane. [ 12 ]…”

Section: Introductionmentioning

confidence: 99%

“…[10,11] Autotrophic electroactive methanogens at the cathode utilize the electrons to synergistically enrich methane by in situ conversion of access CO 2 into methane. [12] The process of enriching methane in MES is a series of oxidation and reduction reactions occurring at electrodes having biofilm, and thus the electron transfer between the microbes and electrode is important. Typically, the performance of MES is hindered by the inefficient electron uptake of microbes from the cathode.…”

Section: Introductionmentioning

confidence: 99%

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Optimum Magnetite–Zeolite Nanoparticles Loading on the Cathode of Microbial Electrochemical–Anaerobic Digestion System for Enhancing Methane Generation

Park,

Noori,

Thatikayala

et al. 2024

Energy Tech

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Microbial electrochemical systems (MESs) can enhance methane production in anaerobic digestion, but their performance is hindered by inadequate electron transfer between the cathode and microbes. Magnetite–zeolite (MZ)‐based catalysts accelerate electron exchange; however, the optimal loading of MZ is crucial for maximizing MES performance. In this study, different loadings of the MZ catalyst ranging from 0 to 2 mg cm−2 on the cathode were evaluated to obtain an optimum loading for maximizing methane recovery from MES. Electrochemical analyses demonstrated enhanced electrochemical reduction kinetics of the cathode with increased MZ loading from 0 to 2 mg cm−2. Among the tested loadings, the MES with 1 mg cm−2 MZ on the cathode exhibited the highest methane production rate at 548 mL L−1 d−1, surpassing other MES operations with 2 and 0.5 mg cm−2 (499 and 434 mL L−1 d−1, respectively). Additionally, the MES with 1 mg cm−2 MZ demonstrated the highest soluble chemical oxygen demand removal efficiency of 87% and total coulomb recovery of 1444.06C ± 42.60C, with the lowest amount of volatile fatty acids accumulation. Consequently, MZ is recommended as a superior catalyst for enhancing MES performance and suggested to utilize 1 mg cm−2 MZ loading on the cathode to maximize methane production.

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“…[ 10,11 ] Autotrophic electroactive methanogens at the cathode utilize the electrons to synergistically enrich methane by in situ conversion of access CO 2 into methane. [ 12 ]…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimum Magnetite–Zeolite Nanoparticles Loading on the Cathode of Microbial Electrochemical–Anaerobic Digestion System for Enhancing Methane Generation

Park,

Noori,

Thatikayala

et al. 2024

Energy Tech

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“…This promising strategy will not only reduce atmospheric CO 2 levels but will also address the difficulties of the current and upcoming energy crisis 5 . In this line, numerous methods, including thermochemical 6 , photocatalytic 7 , 8 , photoelectrochemical 9 , and electrochemical 10 – 17 , and microbial electrochemical processes 18 , 19 , have been proposed to transform CO 2 into value-added compounds. The electrochemical approach stands out as the best among all of these options because it is small in size and is simple to operate using electrode potentials 20 .…”

Section: Introductionmentioning

confidence: 99%

Copper foam supported g-C3N4-metal–organic framework bacteria biohybrid cathode catalyst for CO2 reduction in microbial electrosynthesis

Noori,

Mansi,

Sundriyal

et al. 2023

Sci Rep

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Microbial electrosynthesis (MES) presents a versatile approach for efficiently converting carbon dioxide (CO2) into valuable products. However, poor electron uptake by the microorganisms from the cathode severely limits the performance of MES. In this study, a graphitic carbon nitride (g-C3N4)-metal–organic framework (MOF) i.e. HKUST-1 composite was newly designed and synthesized as the cathode catalyst for MES operations. The physiochemical analysis such as X-ray diffraction, scanning electron microscopy (SEM), and X-ray fluorescence spectroscopy showed the successful synthesis of g-C3N4-HKUST-1, whereas electrochemical assessments revealed its enhanced kinetics for redox reactions. The g-C3N4-HKUST-1 composite displayed excellent biocompatibility to develop electroactive biohybrid catalyst for CO2 reduction. The MES with g-C3N4-HKUST-1 biohybrid demonstrated an excellent current uptake of 1.7 mA/cm2, which was noted higher as compared to the MES using g-C3N4 biohybrid (1.1 mA/cm2). Both the MESs could convert CO2 into acetic and isobutyric acid with a significantly higher yield of 0.46 g/L.d and 0.14 g/L.d respectively in MES with g-C3N4-HKUST-1 biohybrid and 0.27 g/L.d and 0.06 g/L.d, respectively in MES with g-C3N4 biohybrid. The findings of this study suggest that g-C3N4-HKUST-1 is a highly efficient catalytic material for biocathodes in MESs to significantly enhance the CO2 conversion.

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“…Whether or not the ion exchange membrane is added to the MEC, it can also be divided into single-and double-chamber MEC because the single-chamber MEC has a simple structure, low cost, easy installation and debugging, and low internal resistance. Therefore, the single-chamber MEC is the preferred choice for AD-MEC [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Carbon Felt Composite Electrode Plates Promote Methanogenesis through Microbial Electrolytic Cells

Xiao

Zhu

et al. 2023

Energies

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Bioelectrochemical systems are widely used in waste utilization processes. Among them, anaerobic digestion (AD) and microbial electrolytic cell coupling (MEC) are cost-effective and efficient waste-to-energy technologies. In this study, the proposal was made that a carbon felt composite electrode plate be applied to an AD-MEC reactor. The control experiment was conducted using an AD reactor (without the external power supply). The result shows that the carbon felt composite electrode plate increased the biogas production of the AD-MEC reactor by 15.4%, and the average methane content increased by 9.49% compared to the control AD reactor. The total methane production of the AD-MEC reactor and control reactor was 302.51 and 407.79 mL, respectively. The total methane production of the AD-MEC reactor was 34.8% higher than the control group. In addition, the authors found that Methanosarcina and Methanosaeta activities in the AD-MEC reactor were significantly increased. The carbon felt composite electrode plate applied in AD-MEC may have promoted the methanogenic microorganisms’ interspecific acetic acid transport process and increased biogas production and methane content.

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Accelerating anaerobic digestion process with novel single chamber microbial electrochemical systems with baffle

Cited by 17 publications

References 45 publications

Optimum Magnetite–Zeolite Nanoparticles Loading on the Cathode of Microbial Electrochemical–Anaerobic Digestion System for Enhancing Methane Generation

Optimum Magnetite–Zeolite Nanoparticles Loading on the Cathode of Microbial Electrochemical–Anaerobic Digestion System for Enhancing Methane Generation

Copper foam supported g-C3N4-metal–organic framework bacteria biohybrid cathode catalyst for CO2 reduction in microbial electrosynthesis

Carbon Felt Composite Electrode Plates Promote Methanogenesis through Microbial Electrolytic Cells

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