Primary fermenters and Secondary fermenters Primary fermenters: consume glucose to a variety of fermentation products(acetate propionate, butyrate, succinate, alcohols hydrogen and CO2 Secondary fermenters: key organisms in the conversion of complex organic materials to methane(espacially the H2-producing fatty acid oxidizing bacteria)Primary fermenters and Secondary fermenters Primary fermenters: consume glucose to a variety of fermentation products (acetate, propionate, butyrate, succinate, alcohols, hydrogen and CO2. Secondary fermenters: key organisms in the conversion of complex organic materials to methane (espacially the H2-producing fatty acid￾oxidizing bacteria)