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This study compared single- and two-stage mesophilic fermentation of Laminaria digitata. The two-stage system comprised a hydrolysis reactor (H1) with a hydraulic retention time (HRT) of 4days followed by two methanogenesis reactors M1 and M2 with HRT of 20 and 14days respectively. The single-stage reactor (M3) had an HRT of 24days. Specific methane yields of 176, 234 and 221L/kg VS were obtained...
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