Thermodynamic efficiency of carbon capture and utilisation in anaerobic batch digestion process

Oh, Sungtaek; Martin, Alastair

doi:10.1016/j.jcou.2016.07.006

Cited by 11 publications

(8 citation statements)

References 20 publications

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“…They are relatively 'passive donors' of molecular hydrogen, providing as much as the hydrolytic fermentative taxon requires, and they obtain ATP energy building a two-layer structured bioflocs [19]. This is readily observed in a state of electrochemical equilibrium [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…Observed hydrogen partial pressures have been interpreted as the consequences of 'product inhibition' in acetogens, and the acetogenic efficiency depends strongly on the removal rate of molecular hydrogen in hydrogenophilic methanogenic species [24,25]. Oh and Martin [11,20,26] also reported that the metabolic reaction in acetogenic taxon (ii) is only thermodynamically spontaneous (∆G <<0) in the presence of methanogenic archaebacteria, and identified the consortia depending on electrochemical potential (ψ). The electrochemical reaction relies strongly on the syntrophic bacteria.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical communication in anaerobic digestion

Kang

Azizi

2018

Chemical Engineering Journal

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Anaerobic microbial consortia in AD or fermentation oxidise or reduce a target organics (including nutrients) in order to share (i.e. extract and utilise) thermodynamic enthalpy energy (i.e. ATP with thermal energy). Herein, the oxidation and reduction (i.e. electrochemical reaction) is a type of biochemical reaction that involves a transfer of electrons or hydrogens between two species and or taxa. The review discusses an electrochemical communication in the bacterial communal society leading to a 'bacterial cartel' which can be a type of struggling for life (to obtain the biochemical energy constantly). Interestingly, syntrophic bacteria (mostly acetogenic bacteria) bind or flocculate the AD bacterial consortia and build two-layer biofilms or bioflocs to obtain the energy while producing a peculiar profile of fatty acids. The hydrolytic fermentative bacteria also dissociate with acidogenic bacteria for an association with the syntrophic bacteria when ∆ψ approaches at between-200 and-250 mV. Three examples (singlemethanogenesis, long-chain fatty acid (LCFA) degradation and acid-fermentation process) explain in the electrochemical origin. This concept remains quite controversial, but if true, may have major implications in broad areas of environmental and biological processes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrochemical communication in anaerobic digestion

Kang

Azizi

2018

Chemical Engineering Journal

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“…The assumption was based on the fundamental knowledge of chemical transport phenomena, which are much faster than the conventional microbial growth kinetics, including cellular differentiation [14,31]. The microorganisms having anaerobic respiration were also assumed to exchange a couple of intra/extracellular mediators (NAD + /NADH) [12,14,15,[31][32][33], so as to share their metabolites. One mmole of NADH was added as the mediator, which was further assumed to be used in a citric acid cycle (CAC) and oxidative phosphorylation.…”

Section: Model Developmentmentioning

confidence: 99%

“…This second stage is theoretically reversible, but it always observes a thermodynamic limitation (∆G>0 and ∆H>0). In this case, both these first and second stages are readily able to bond spontaneously by themselves and build a two-layer structured (fermentative-acidogenic) biofilm [15], which can readily be observed in acidfermentation on organic particles.…”

Section: Introductionmentioning

confidence: 99%

Thermoplastic starch wastes are converted and stored into acetone through butanol in a depressurised digester

Martin

Kang

2018

Chemical Engineering Journal

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A biofilm containing both hydrolytic fermentative bacteria and acidogenic bacteria (including acetogenic and acetoclastic bacteria) was developed for the treatment of plastic wastes in a twophase, batch digester. The biotransformation and further degradation were electrochemically observed. It was found that the organic wastes were initially fermented in a single-phase (i.e. liquid phase) digester, where it entirely obeyed microbial growth kinetics in accumulating acetate. As the carbonates produced were vaporised, the single-phase became a two-phase fermentation (gas and liquid) accumulating volatile fatty acids (VFAs), where it obeyed a proton driving force based on Le Chatelier's principle. Interestingly, as the digester was depressurised to the saturated vapour pressure of water, the accumulated VFAs were rapidly transformed into acetone via butanol, so that the VFAs forms were not observable. It was found that in extreme conditions, the organic feeds were converted and stored into acetone, via butanol.

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“…However, this CCS technology has several problems such as high cost, additional energy requirements, stability, and storage limitations. Therefore, carbon capture and utilization (CCU) technology is expected to replace it 4–6 , and is advantageous in economic and environmental view because it can prevent CO 2 emissions, and convert them into useful materials. There are various strategies for CO 2 utilization.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of layered perovskite Sr2TiO4 for improved CO2 photoreduction with H2O to CH4

Kwak

Yeon

Park

et al. 2017

Sci Rep

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Layered perovskite Sr2TiO4 photocatalyst was synthesized by using sol-gel method with citric acid. In order to increase the surface area of layered perovskite Sr2TiO4, and thus to improve its photocatalytic activity for CO2 reduction, its surface was modified via hydrogen treatment or exfoliation. The physical and chemical properties of the prepared catalysts were characterized by X-ray diffraction, high-resolution transmission electron microscopy, elemental mapping analysis, energy-dispersive X-ray spectroscopy, N2 adsorption-desorption, UV-Vis spectroscopy, X-ray photoelectron spectroscopy, photoluminescence, and electrophoretic light scattering. CO2 photoreduction was performed in a closed reactor under 6 W/cm2 UV irradiation. The gaseous products were analyzed using a gas chromatograph equipped with flame ionization and thermal conductivity detectors. The exfoliated Sr2TiO4 catalyst (E-Sr2TiO4) exhibited a narrow band gap, a large surface area, and high dispersion. Owing to these advantageous properties, E-Sr2TiO4 photocatalyst showed an excellent catalytic performance for CO2 photoreduction reaction. The rate of CH4 production from the photoreduction of CO2 with H2O using E-Sr2TiO4 was about 3431.77 μmol/gcat after 8 h.

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Thermodynamic efficiency of carbon capture and utilisation in anaerobic batch digestion process

Cited by 11 publications

References 20 publications

Electrochemical communication in anaerobic digestion

Electrochemical communication in anaerobic digestion

Thermoplastic starch wastes are converted and stored into acetone through butanol in a depressurised digester

Surface modification of layered perovskite Sr2TiO4 for improved CO2 photoreduction with H2O to CH4

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