Impact of liquid-to-gas hydrogen mass transfer on substrate conversion efficiency of an upflow anaerobic sludge bed and filter reactor
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A comparison of microbial and bioelectrochemical approaches for biogas upgrade through carbon dioxide conversion to methane
2021, Sustainable Energy Technologies and AssessmentsCitation Excerpt :Off-gas flow and composition were measured for each electrode compartment. The approach of in situ biogas upgrade by CO2 conversion to CH4 involved continuous injection of exogenously produced (e.g. by water electrolysis) H2 into the biogas recirculation loop of the anaerobic reactor shown in Fig. 1A. Previously, biogas recirculation was shown to improve anaerobic reactor performance by improving gas transfer characteristics [9]. In order to optimize reactor performance, key operating parameters affecting H2 supply and gas transfer characteristics such as H2 flow rate, stirrer speed, and the biogas recirculation rate, were varied in a series of tests based on a two-level full factorial design.
Enhancement of dark fermentative H<inf>2</inf> production by gas separation membranes: A review
2020, Bioresource TechnologyInfluence of liquid-phase hydrogen on dark fermentation by Thermotoga neapolitana
2019, Renewable EnergyCitation Excerpt :More specifically, headspace sparging with N2 or CO2 leads to an undesired dilution of the produced biogas [25], while the reduction of the total reactor pressure and vigorous stirring are extremely challenging in industrial applications and entail an inevitable increase of the reactor operation costs. Recirculation of biogas [21,26] has proven promising as it increases the area for gas-liquid mass transfer similar to inert gas sparging, without dilution of the final biogas. In addition, the application of bubble inducing objects in the reactor has revealed a high potential.
A novel gas separation integrated membrane bioreactor to evaluate the impact of self-generated biogas recycling on continuous hydrogen fermentation
2017, Applied EnergyCitation Excerpt :As concluded by Clark et al. [35], feasible reactor stripping – especially when thinking about scale-up – should be carried out with a gas produced onsite. Results on the effect of simple biogas recycling indicated relative enhancement of H2 formation compared to that attained under control circumstances [36,37]. However, even if the own biogas of the fermenter is applied for such a purpose, its composition can be a crucial factor to deal with.
Production of biogas via anaerobic digestion
2016, Handbook of Biofuels Production: Processes and Technologies: Second Edition