Fig. 6

Difference decrease in the fast 1st phase and difference increase in biogas produced from the slow 2nd phase. a Kinetic analysis and fitted data (solid line). Analysis was for the slow 2nd phase based on values recorded between day 7 and day 34 in Fig. 5. b Resulting percent net differences at different time points for the separated initial fast phase (grey bars), and the second slow phase (black bars) of BMP-LC/IES as compared to BMP-LC. At approximate day 9, there is no net difference in biogas production from easily accessible material consumed in the fast phase. In contrast, in the slow phase of biogas production from hydrolysis of less accessible material, the net difference between BMP-LC/IES and BMP-LC increases until day 34. To facilitate comparison to the non-separated experimentally collected data, b is plotted with the same time evolution as in Fig. 5