Hydrogen and methane production in extreme thermophilic conditions in two-stage (upflow anaerobic sludge bed) UASB reactor system

► H2 and CH4 were produced in two stage UASB reactor system at 70 °C. ► Extreme thermophilic micro-organisms can also be found in mesophilic environments. ► Hydrogen yield was 0.73 mol/mol glucoseadded. ► Methane yield was 117.5 ml/g CODadded.