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    • In Situ Methane Enrichment in Methanogenic Energy Crop Digesters 

      Richards, Brian K.; Herndon, Frederick G.; Jewell, William J.; Cummings, Robert J.; White, Thomas E. (1994-01)
      A simple in situ technique to enrich digester offgas, which normally contains 30-50% carbon dioxide (CO,) by volume, was developed to take advantage of the differing solubilities of CO, and methane (CH,). Dissolved CO, was ...