Figure 4From: An integrated approach for efficient biomethane production from solid bio-wastes in a compact system Organic loading rates (OLRs) and methane yields of the one-stage BSG-EGSB (white circle), two-stage BSG-ESGB (black circle), and PM-EGSB (black square). BSG, brewers’ spent grain; EGSB, expanded granular sludge bed; PM, pig manure.Back to article page