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An assessment was carried out on the effect of temperature on the anaerobic digestion of Laminaria digitata biomass, in batch reactors (25, 35, 45 and 55 °C) with a hydraulic retention time of 40 days. The first order, modified Gompertz and logistics models were used to obtain the kinetic parameters of the biogas production process. Results indicate the chemical composition of the algae substrate could be written as CHONS, with a theoretical methane yield of 336 ± 0.86 L CH kg VS. Experimental methane yield obtained from the reactors for 25, 35, 45, and 55 °C were 318 ± 1.58, 293 ± 1.11, 271 ± 0.98 and 352 ± 0.63 mL CH/gVS respectively. Their R > 0.90 indicate both models fits well for predicating kinetics of methane production. The lowest k (0.31), high biodegradability index (0.96) and lag time (9.3-11.7 days) were obtained for 55 °C.

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International licence Newcastle University ePrints -eprint.ncl.ac.uk Membere E, Edwards S, Egwu U, Sallis P. Bio-methane potential test (BMP) using inert gas sampling bags with macroalgae feedstock.