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Methods for selectively producing hydrogen and methane from biomass feedstocks using an anaerobic biological system

  • US 8,246,828 B2
  • Filed: 08/04/2009
  • Issued: 08/21/2012
  • Est. Priority Date: 08/04/2009
  • Status: Expired due to Fees
First Claim
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1. A method for selective production of hydrogen and methane from a biomass feedstock in a reactor vessel maintained under anaerobic conditions, the method comprising:

  • a) introducing a pretreated biomass feedstock into a reactor vessel maintained under anaerobic conditions;

    b) introducing a bacterial inoculum into the reactor vessel to facilitate digestion of the biomass feedstock;

    c) setting a moisture concentration of contents of the reactor vessel at a first moisture level less than 85%;

    d) collecting hydrogen gas from the reactor vessel at the first moisture level;

    e) increasing the moisture concentration of the contents of the reactor vessel to a second moisture level greater than 90%; and

    f) collecting methane gas from the reactor vessel at the second moisture level.

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