Acetic acid is an essential industrial building block and can be produced by acetogenic bacteria from molecular hydrogen (H 2 ) carbon dioxide (CO ). When gasses are supplied as substrates, bioreactor design plays important role for their availability. Trickle-bed bioreactors (TBs) have enhanced gas-to-liquid mass transfer cells remain in the system forming a biofilm on carriers. So far, TBs be...

Thiobacillus ferrooxidans was used in fixed-film bioreactors to oxidize ferrous sulfate to ferric sulfate. Glass beads, ion-exchange resin, and activated-carbon particles were tested as support matrix materials. Activated carbon was tested in both a packed-bed bioreactor and a fluidized-bed bioreactor; the other matrix materials were used in packed-bed reactors. Activated carbon displayed the m...

Biomethane constitutes an important biofuel for the transition towards a biobased circular economy with sustainable energy sector. An environmentally friendly pathway its production is through gasification of 2nd generation biomass that generates syngas (H2, CO, and CO2), followed by biomethanation. A novel design thermophilic trickle bed bioreactor was successfully tested at semi-pilot scale. ...

This paper reports the effect of superficial liquid mass flow rate and bed void fraction on the pressure drop, dynamic liquid hold-up, mean liquid residence time and biofilm wetting, in a co-current down-flow xylene-removing trickle bed air biofilter (TBAB). The gas–liquid pressure drop increased with liquid mass flow rate and it also increased with diminishing bed void fraction, the effect bei...

the oxidation of ferrous iron (fe2+) in solution using acidithiobacillus ferrooxidans has industrial applications exclusively in the regeneration of ferric iron (fe3+) as an oxidizing agent for the removal of hydrogen sulfide from waste gases, desulfurization of coal, leaching of non-ferrous metallic sulfides and treatment of acid mine drainage. the aim of this investigation was to increase the...

Mathematical models are important tools for optimizing the design and operation of solid-state fermentation (SSF) bioreactors. Such models must describe the transport phenomena within the substrate bed and mass and energy exchanges between the bed and the other subsystems of the bioreactor, such as the bioreactor wall and headspace gases. The sophistication with which this has been done for SSF...