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Enhanced glycerol conversion by Thermoanaerobacter strains
Magalhães, Carla Isabel Pereira; Ribeiro, Joaquim Alfredo França Martins; Guedes, Ana P.; Arantes, Ana Luísa; Sousa, Diana Zita MachadoGlycerol-rich waste streams produced as a surplus by the biodiesel industry can be treated and valorized by anaerobic microbial communities to produce biogas. Glycerol is a highly reduced compound. Its complete degradation to methane and carbon dioxide requires a syntrophic cooperation of anaerobic bacteria and archaea, either directly or through propionate, lactate or ethanol as intermediates. The aim of this ...
CH4 production at moderate H2/CO2 pressures - insights on the specific hydrogen...
Barbosa, Sónia G.; Alves, Joana I.; Arantes, Ana Luísa; Lopes, Marlene; Alves, M. M.CO2 is one of the main contributors to greenhouse gases (GHGs), being its emission to the atmosphere one of the major driver of global climate change. Biological methanation of CO2 using renewable H2 provides a promising approach to use of superplus renewable electrical power to produce a gaseous fuel. CH4 is considered an important renewable energy carrier, that has a wide range of applications such as natural...
Microbial propionate production from carbon monoxide a novel bioprocess
Moreira, João; Diender, Martijn; Arantes, Ana Luísa; Boeren, Sjef; Stams, Alfons Johannes Maria; Alves, M. M.; Alves, Joana I.; Sousa, Diana Z.Introduction: The fermentation of CO-rich gases by carboxidotrophic microbes is a promising way to produce valuable organic compounds. Propionate is a value-added compound with numerous industrial applications, e.g. as an antifungal agent in food and feed, and as a building block to produce plastics and herbicides. Propionate is currently produced by petrochemical processes, but it can be produced from ethanol ...
CH4 production at moderate H2/CO2 pressures insights on the use of anaerobic gr...
Barbosa, Sónia G.; Alves, Joana I.; Lopes, Marlene; Arantes, Ana Luísa; Alves, M. M.Introduction: The continuous increase in energy consumption and the intensive use of fossil fuels, lead to the emission of greenhouse gases (GHG) and, in particular, to an increase in the concentration of CO2 in the atmosphere. In this context, the improvement in global awareness and the demand for sustainable technologies and products strongly contribute to laid plans to combat climate change. CO2-to-CH4 conve...
Anaerobic granular sludge as biocatalyst for CH4 production at moderate H2/CO2 ...
Barbosa, Sónia G.; Alves, Joana I.; Lopes, Marlene; Arantes, Ana Luísa; Alves, Maria MadalenaUnprecedented environmental concerns related to the intensive use of fossil fuels has led to the use of alternative energy carriers for the production of biofuels/biochemicals. In this context, the development of alternative technologies for carbon capture and utilization has attracting more and more attention. Gas fermentation is a promising strategy for the production of bioproducts through the conversion of ...
Propionate production from carbon monoxide by synthetic cocultures of acetobact...
Moreira, João Paulo Carvalho; Diender, M.; Arantes, Ana Luísa; Boeren, S.; Stams, Alfons Johannes Maria; Alves, M. M.; Alves, Joana I.Gas fermentation is a promising way to convert CO-rich gases to chemicals. We studied the use of synthetic cocultures composed of carboxydotrophic and propionigenic bacteria to convert CO to propionate. So far, isolated carboxydotrophs cannot directly ferment CO to propionate, and therefore, this cocultivation approach was investigated. Four distinct synthetic cocultures were constructed, consisting of Acetobac...
Effect of sulfate on carbon monoxide conversion by a thermophilic syngas-fermen...
Alves, J. I.; Visser, Michael; Arantes, Ana Luísa; Nijsse, Bart; Plugge, Caroline M.; Alves, M. M.; Stams, Alfons Johannes MariaA syngas-degrading enrichment culture, culture T-Syn, was dominated by a bacterium closely related to Desulfofundulus australicus strain AB33T (98% 16S rRNA gene sequence identity). Culture T-Syn could convert high CO concentrations (from pCO 34 kPa to pCO 170 kPa), both in the absence and in the presence of sulfate as external electron acceptor. The products formed from CO conversion were H2 and acetate. With ...
Co-cultivation of Thermoanaerobacter strains with a methanogenic partner enhanc...
Magalhães, Carla Isabel Pereira; Ribeiro, Joaquim Alfredo França Martins; Guedes, Ana P.; Arantes, Ana Luísa; Sousa, Diana Zita MachadoGlycerolrich waste streams produced by the biodiesel, bioethanol and oleochemical industries can be treated and valorized by anaerobic microbial communities to produce methane. As current knowledge of the microorganisms involved in thermophilic glycerol conversion to methane is scarce, thermophilic glyceroldegrading methanogenic communities were enriched. A coculture of Thermoanaerobacter and Methanothermobacte...
Enrichment of anaerobic syngas-converting communities and isolation of a novel ...
Arantes, Ana Luísa; Moreira, João Paulo Carvalho; Diender, Martijn; Parshina, Sofiya N.; Stams, A. J. M.; Alves, M. M.; Alves, J. I.Syngas is a substrate for the anaerobic bioproduction of fuels and valuable chemicals. In this study, anaerobic sludge was used for microbial enrichments with synthetic syngas and acetate as main substrates. The objectives of this study were to identify microbial networks (in enrichment cultures) for the conversion of syngas to added-value products, and to isolate robust, non-fastidious carboxydotrophs. Enrichm...
Effect of sub-stoichiometric Fe(III) amounts on LCFA degradation by methanogeni...
Cavaleiro, Ana Júlia; Guedes, Ana P.; Silva, Sérgio Alves; Arantes, Ana Luísa; Costa, João Carlos Sequeira; Salvador, Andreia Filipa FerreiraLong-chain fatty acids (LCFA) are common contaminants in municipal and industrial wastewater that can be converted anaerobically to methane. A low hydrogen partial pressure is required for LCFA degradation by anaerobic bacteria, requiring the establishment of syntrophic relationships with hydrogenotrophic methanogens. However, high LCFA loads can inhibit methanogens, hindering biodegradation. Because it has bee...