Fig. 1. Methane production during anaerobic digestion of DECA wastewater in the presence of 2 g/L (A), 1 g/L (B), 0.5 g/L (C) or in the absence (D) of glucose. Methane production by the inoculum alone (control) was already subtracted. All values represent the mean of duplicate assays with maximum standard deviation of 3.8%.