Comparative Evaluation of Two Packing Materials (Glass Pipe and Ceramic Ball) for Hydrogenothrophic Biomethanation (BHM)
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ORIGINAL PAPER
Comparative Evaluation of Two Packing Materials (Glass Pipe and Ceramic Ball) for Hydrogenothrophic Biomethanation (BHM) of CO2 S. Tugce Daglioglu1 · T. Ceren Ogut2 · Guven Ozdemir3 · Nuri Azbar2 Received: 4 May 2020 / Accepted: 10 September 2020 © Springer Nature B.V. 2020
Abstract Hydrogenothrophic biomethanation of CO2 is an attractive alternative method for either to increase biogas production or upgrading biogas in biogas plants as a carbon capture and utilization (CCU) technology. The use of various packaging materials providing efficient cell immobilization can increase hydrogenotrophic biomethanation efficiency. For this purpose, the effect of two packing materials (ceramic ball and glass pipe) on hydrogenotrophic biomethanation efficiency were investigated. It was found that glass pipe outcompeted ceramic ball in terms of both H 2 utilisation efficiency (55% for ceramic ball and 85% for the glass pipe), high C H4 content in the headspace (65% for ceramic ball and 78% for the glass pipe) and methane formation rates (MFR: 3.9 and 4.8 m3CH4/m3reactor/day for ceramic ball and glass pipe, respectively). Graphic Abstract
Keywords Biomethanation · Hydrogenotrophic methanation · Immobilization · CO2 utilization
* Nuri Azbar [email protected] Extended author information available on the last page of the article
Abbreviations CO2 Carbon dioxide H2 Hydrogen CH4 Methane
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MBBR Moving bed biofilm reactors TBR Trickle bed reactor UASB Up flow anaerobic sludge blanket TSS Total suspended solids GC Gas chromatograph VFA Volatile fatty acids MFR Methane formation rate Aeff Effective surface area Aspec Specific surface area
Statement of Novelty Packing materials are critical in terms of cell immobilisation, efficient contact time between gas bubbles and inoculum providing effective gas-hold up. In this regard, it is crucial to find and test new materials serving for better biomethanation purpose. In this study, two new and promising packing materials, namely ceramic ball and glass pipe were successfully tested for hydrogenotrophic biomethanation.
Introduction The biomethanation of gas substrates such as CO2 and H2 is carried out by the synergistic action of microorganisms in a mixed microbial consortium. These gaseous substrates are used as a carbon and energy source to synthesize a mixture of methane and carbon dioxide which is a strictly anaerobic process that operates at either mesophilic or thermophilic conditions. Biomethane conversion is realized by several microbial groups such as methanogenic archaea, acetogenic bacteria and hydrogenogenic bacteria among others, with all of them occurring in syntrophic association. As a result, a complex network of biochemical reactions mainly based on acetogenesis, hydrogenotrophic methanation, carboxydotrophic methanation and acetoclastic methanation takes place during biomethanation process. Use of mixed culture instead of pure culture is preferred due to the inherent merits of mixed cultures such as non-ste
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