Figure 1: Main pathways for anaerobic degradation of organic matter used in the Angelidaki et al. [12] model (A) hydrolysis of undissolved carbohydrates; (B) hydrolysis of of undissolved proteins; (1) glucose-fermenting acidogens; (2) lipolytic bacteria; (3) long chain fatty acid (LCFA)-degrading acetogens; (4) amino acid-degrading acidogens; (5) propionate (HPr)- degrading acetogens; (6) butyrate (HBut)-degrading acetogens; (7) valerate (HVal)-degrading acetogens; (8) aceticlastic (HAc)-degrading methanogens.