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Process phase separation for methane enrichment

This study explores the innovative use of microorganisms to improve methane enrichment through phase separation processes in biogas upgrading. Existing methods such as amine scrubbers, membrane systems, and cryogenic processes are compared with this new approach, highlighting its economic feasibility for large-scale applications. Experiments conducted with various substrates, including sugar-cellulose mixtures and pig manure, demonstrate the potential for achieving methane fractions up to 85%. This method demonstrates a relatively simple and cost-effective solution to enhance energy storage capacity in biogas systems, particularly in STR cascades.

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Process phase separation for methane enrichment

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  1. Process phase separation for methane enrichment using microorganismsabilities for biogas upgrading Flensburg, 12.09.2013 Torsten Stefan, B.Sc. Bioprocess Eng.

  2. Table of Contents • Motivation • Idea and Theory • Experiments • Results • Future aspects • Summary

  3. Motivation

  4. Separation of CO2 and CH4 mixtures • Water or polyglycol scrubbers • Amine scrubbers • Membrane systems • Cryogenicprocesses Economicallyfeasable in large scale (>1 MWel)

  5. Polymericmolecules Biogas process Monomers CO2, H2 H2S, NH3, N2 Volatile fattyacids CO2, H2 Formic/aceticacid, CO2, H2 CO2, CH4 digestate

  6. Hydrolysis Pictures:chemienet.info

  7. Acidogenesis

  8. Acetogenesis

  9. Methanogenesis

  10. Polymericmolecules Biogas process Monomers CO2, H2 H2S, NH3, N2 Volatile fattyacids CO2, H2 Formic/aceticacid, CO2, H2 CO2, CH4 digestate

  11. CO2solubility in water physical chemical

  12. Polymericmolecules Biogas process Monomers CO2, H2 H2S, NH3, N2 Volatile fattyacids CO2, H2 Formic/aceticacid, CO2, H2 CO2, CH4 digestate

  13. Experiments

  14. Results Substrate: Sugar-Cellulose-Mixture

  15. Results Substrate: Sour cheese whey

  16. Results Substrate: Pig-Manure

  17. ResultsfromLiterature Substrate: Soybean Processing Wastewater Resource: Zhu, G.F. ; Li, J.Z. ; Wu, P. ; Jin, H.Z. ; Wang, Z.: The performanceandphaseseparatedcharacteristicsof an anaerobicbaffledreactortreatingsoybeanproteinprocessingwastewater. In:Bioresourcetechnology 99 (2008), Nr. 17, S. 8027–8033

  18. Next steps • Examinemixturesofmanureandsouringsubstrates • Investigate semi-aerobichydrolysis • Upscalingto 200 L / 2 m³ • Prooveapplicabilityto STR cascades

  19. Summary • Phase separationusesnaturalsequencedbiogasprocessformethaneenrichment • Methanefractionupto 85% • Relatively simple andcheaptechnology • Enhancesenergystoragecapacitythroughhighermethanecontent • Applicableto STR cascades • Problems: slowlyhydrolysiblesubstratesandsubstrateswithhighalkalinity in mono-fermentation

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