Temperature dependence of bioelectrochemical CO2 conversion and methane production with a mixed-culture biocathode

Yang, Hou-Yun; Bao, Bai-Ling; Liu, Jing; Qin, Yuan; Su, Kuizu; Han, Jun-Cheng; Mu, Yang

doi:10.1016/j.bioelechem.2017.10.002

Cited by 45 publications

(20 citation statements)

References 49 publications

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“…The MgenA enrichments, contained Pseudomonas spp, which are known to mediate electron transfer to an anode by production of soluble redox mediators 15 . MgenA also contained Methanosaeta , which has been observed on biocathodes 56,57 . The NR enrichments were dominated by Paracoccus spp., which have been observed on denitrifying biocathodes 42 .…”

Section: Discussionmentioning

confidence: 76%

A variety of hydrogenotrophic enrichment cultures catalyse cathodic reactions

Saheb-Alam

Persson

Wilén

et al. 2019

Sci Rep

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Biocathodes where living microorganisms catalyse reduction of CO2 can potentially be used to produce valuable chemicals. Microorganisms harbouring hydrogenases may play a key role for biocathode performance since H2 generated on the electrode surface can act as an electron donor for CO2 reduction. In this study, the possibility of catalysing cathodic reactions by hydrogenotrophic methanogens, acetogens, sulfate-reducers, denitrifiers, and acetotrophic methanogens was investigated. The cultures were enriched from an activated sludge inoculum and performed the expected metabolic functions. All enrichments formed distinct microbial communities depending on their electron donor and electron acceptor. When the cultures were added to an electrochemical cell, linear sweep voltammograms showed a shift in current generation close to the hydrogen evolution potential (−1 V versus SHE) with higher cathodic current produced at a more positive potential. All enrichment cultures except the denitrifiers were also used to inoculate biocathodes of microbial electrolysis cells operated with H+ and bicarbonate as electron acceptors and this resulted in current densities between 0.1–1 A/m2. The microbial community composition of biocathodes inoculated with different enrichment cultures were as different from each other as they were different from their suspended culture inoculum. It was noteworthy that Methanobacterium sp. appeared on all the biocathodes suggesting that it is a key microorganism catalysing biocathode reactions.

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Section: Discussionmentioning

confidence: 76%

A variety of hydrogenotrophic enrichment cultures catalyse cathodic reactions

Saheb-Alam

Persson

Wilén

et al. 2019

Sci Rep

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“…This material was chosen given its mechanical and electrical properties, and its appropriate surface chemistry, suitable for biofilm growth, based on previous experience [25]. The ratio between electrodes surface and reactor volume (23.8 m 2 m −3 ) was within the range of values that could be calculated from previous EMG studies (10-40 m 2 m −3 ) [8,16,21,23,24]. The electric connection to the external circuit was made by current collectors in graphite/fluoropolymer composite material (SGL Group).…”

Section: Emg-bes Construction Operation and Characterizationmentioning

confidence: 99%

“…Moreover, at lower E cat it is possible to increase reaction kinetics and achievable CH 4 production rate ( Figure 1). [8,[14][15][16][17][18][19][20][21][22][23][24]. Surface specific methane production rate values are reported versus applied cathode potential.…”

Section: Introductionmentioning

confidence: 99%

Integration of Membrane Contactors and Bioelectrochemical Systems for CO2 Conversion to CH4

et al. 2019

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Anaerobic digestion of sewage sludge produces large amounts of CO2 which contribute to global CO2 emissions. Capture and conversion of CO2 into valuable products is a novel way to reduce CO2 emissions and valorize it. Membrane contactors can be used for CO2 capture in liquid media, while bioelectrochemical systems (BES) can valorize dissolved CO2 converting it to CH4, through electromethanogenesis (EMG). At the same time, EMG process, which requires electricity to drive the conversion, can be utilized to store electrical energy (eventually coming from renewables surplus) as methane. The study aims integrating the two technologies at a laboratory scale, using for the first time real wastewater as CO2 capture medium. Five replicate EMG-BES cells were built and operated individually at 0.7 V. They were fed with both synthetic and real wastewater, saturated with CO2 by membrane contactors. In a subsequent experimental step, four EMG-BES cells were electrical stacked in series while one was kept as reference. CH4 production reached 4.6 L CH4 m−2 d−1, in line with available literature data, at a specific energy consumption of 16–18 kWh m−3 CH4 (65% energy efficiency). Organic matter was removed from wastewater at approximately 80% efficiency. CO2 conversion efficiency was limited (0.3–3.7%), depending on the amount of CO2 injected in wastewater. Even though achieved performances are not yet competitive with other mature methanation technologies, key knowledge was gained on the integrated operation of membrane contactors and EMG-BES cells, setting the base for upscaling and future implementation of the technology.

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“…A high proportion of Proteobacteria was found in the reactor, which may be related to the formation of exoelectrogens and the increase of nitri cation and denitri cation bacteria [40] . These bacteria belong to the pylum of Proteobacteria.…”

Section: Bacterial and Archael Community Analysismentioning

confidence: 95%

Application of Bioelectrochemical Technique in Energy Recovery and CH4 Control From Constructed Wetland (CW) and Associated Biochemical Mechanisms

Zhang

Wang

et al. 2021

Preprint

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In the context of global warming, the bioelectrochemical method (microbial fuel cell MFC) was proposed for CH4 control from CWs. The main focus is to further explore the effect of plant roots location at the electrode, plant species on CH4 emissions, bioelectricity generation and the mechanism underlying competition between electrogenesis and methanogenesis at the anode. The results showed that the operation of MFC effectively reduced the CH4 emissions and promoted COD removal rates. CH4 emission was significantly higher in open circuit (6.2 mg m-2 h-1) than in closed circuit reactors (3.1 mg m-2 h-1). Plant roots at the cathode had the highest electricity generation and the lowest CH4 emissions. The highest power generation (0.49 V, 0.33 w m-3) and the lowest CH4 emissions (2.3 mg m-2 h-1) were observed in the reactors where Typha Orientalis was planted with plant roots at the cathode. The role of plants in strengthening electron acceptor was greater than that of plant rhizodeposits in strengthening electron donors. q-PCR and correlation analysis indicated that the mcrA genes and CH4 emissions were positively correlated (r=0.98, p<0.01), while no significant relationship between CH4 emissions and pmoA genes was observed. More nanowires, which are conductive to electron transfer, were found when plant roots were in cathode by scanning electron microscope (SEM). Illumina sequencing revealed that more abundant exoelectrogens and denitrifying bacteria (Geobacter, Desulfobulbu, Nitrospira and Anaerolinea) were observed when plant roots located in cathodes. Strictly acetotrophic archae (Methanosaetaceae) were likely main electron donor competitors with exoelectrogens. In addition, plant species played a more important role in CH4 emissions and electricity generation than the plant roots location at the electrode. Therefore, it is necessary to strengthen plant configuration to reduce CH4 emissions, so as to promote sustainable development of wastewater treatment.

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Temperature dependence of bioelectrochemical CO2 conversion and methane production with a mixed-culture biocathode

Cited by 45 publications

References 49 publications

A variety of hydrogenotrophic enrichment cultures catalyse cathodic reactions

A variety of hydrogenotrophic enrichment cultures catalyse cathodic reactions

Integration of Membrane Contactors and Bioelectrochemical Systems for CO2 Conversion to CH4

Application of Bioelectrochemical Technique in Energy Recovery and CH4 Control From Constructed Wetland (CW) and Associated Biochemical Mechanisms

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