Abstract
Bubbleless gas transfer through a hollow fiber membrane (HFM) module was used to supply H2 to an anaerobic reactor for in situ biogas upgrading, and it creates a novel system that could achieve a CH4 content higher than 90 % in the biogas. The increase of CH4 content and pH, and the decrease of bicarbonate concentration were related with the increase of the H2 flow rate. The CH4 content increased from 78.4 % to 90.2 % with the increase of the H2 flow rate from 930 to 1,440 ml/(l day), while the pH in the reactor remained below 8.0. An even higher CH4 content (96.1 %) was achieved when the H2 flow rate was increased to 1,760 ml/(l day); however, the pH increased to around 8.3 due to bicarbonate consumption which hampered the anaerobic process. The biofilm formed on the HFM was found not to be beneficial for the process since it increased the resistance of H2 diffusion to the liquid. The study also demonstrated that the biofilm formed on the membrane only contributed 22–36 % to the H2 consumption, while most of the H2 was consumed by the microorganisms in the liquid phase.
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Acknowledgements
This study was funded by the individual postdoctoral grants from the Danish Council for Independent Research (12-126632), Hans Christian Ørsted Postdoc Program from Technical University of Denmark, and the InterReg IVA programme Biorefinery Øresund financed by EU. The authors thank Hector Garcia for technical assistance with the experiments.
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Luo, G., Angelidaki, I. Hollow fiber membrane based H2 diffusion for efficient in situ biogas upgrading in an anaerobic reactor. Appl Microbiol Biotechnol 97, 3739–3744 (2013). https://doi.org/10.1007/s00253-013-4811-3
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DOI: https://doi.org/10.1007/s00253-013-4811-3