Figure 1From: Combined sodium hydroxide and ammonium hydroxide pretreatment of post-biogas digestion dairy manure fiber for cost effective cellulosic bioethanol productionSchematic representation of the pretreatment of post-biogas digestion manure fibers for cellulosic bioethanol production by NaOH and NH 4 OH. The inset shows (A) reference blank, (B) 0.25% conc. NH4OH (5Â mL), and (C) 0.25% conc. NaOH (2.5Â mL) plus 0.25% conc. NH4OH (2.5Â mL) [49].Back to article page