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. 2020 Jan 11;25(2):296. doi: 10.3390/molecules25020296

Figure 5.

Figure 5

Cumulative methane yield of the solid fraction obtained after pretreatment of GL waste with H2SO4 (a), HCl (b), H3PO4 (c) and NaOH (d), at the concentrations of 2, 10 and 20 g/100 gTS, respectively.