Highly efficient methane generation from untreated microalgae biomass

Table 2 Overview of mean biogas and methane productivities for the low-N and replete-N reactors

	Specific biogas productivity			Specific methane productivity
	(mL_N g⁻¹ VS day⁻¹)			(mL_N g⁻¹ VS day⁻¹)
	Replete-N BM	Low-N BM	Maize silage	Replete-N BM	Low-N BM	Maize silage
OLR 2 g VS L⁻¹ day⁻¹	634 ± 15	761 ± 12	740^a	416 ± 11	464 ± 9	404^a
OLR 4 g VS L⁻¹ day⁻¹	203 ± 50	750 ± 15	620^a	131 ± 33	462 ± 9	339^a

The values were summarized by distinct OLR-phases (OLR 2 = 2 g VS L⁻¹ day⁻¹, OLR 4 = 4 g VS L⁻¹ day⁻¹). Maize silage productivities were included for comparison as predominantly used renewable substrate for industrial scale fermentation. Error bars represent standard error (SE, n = 8)
N nitrogen, VS volatile solids
^aLiterature values for maize silage [41]

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