Fig. 1

Cumulative methane production reactors fed with untreated birch without bioaugmentation (closed triangles), steam-exploded birch without bioaugmentation (open triangles, as well as steam-exploded birch with applied bioaugmentation at different C. bescii loadings (2% v/v open circles; 5% v/v crosses; 10% v/v open squares; and 15% v/v closed circles)