Fig. 2From: What could the entire cornstover contribute to the enhancement of waste activated sludge acidification? Performance assessment and microbial community analysisEffect of CS adjustment form on methane production from WAS (a 50:50%; b 65:35%) and the variation of pH values during WAS and CS co-digestion (a 50:50%; b 65:35%) (Note: error bars represent standard deviation; Panels in c and d represent the optimum pH range for methanogens)Back to article page