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Cumulative methane yield of untreated (GL), thermally treated at 120 °C for 1h (TT (120)) or 80 °C for 24 h (TT (80)) and acid, with H2SO4 (a), HCl (b), H3PO4 (c) and alkali with NaOH (d), at the concentrations of 2, 10 and 20 g/100 gTS, respectively.
