Table 5.

Hydrogen yields, pH and COD balance from batch experiments with Sargassum sp. biomass.

Substrate	Z/I (g g−1)	Hydrogen yielda (mmol g−1)	pHb	COD balanceb (%)
Sargassum sp.	0.26	2.41 ± 0.04	6.60 ± 0.02	99 ± 9
	0.13	2.98 ± 0.28	6.59 ± 0.03	81 ± 8
	0.065	2.56 ± 0.23	6.60 ± 0.01	90 ± 1
	0 (control)	2.13 ± 0.03	6.56 ± 0.04	95 ± 4

The results are the average and standard deviations for duplicates.

^a expressed as mmol H₂ per g of Sargassum sp. (in VS).

^b at the end of batch experiment assays.