Bacterial bioaugmentation for improving methane and hydrogen production from microalgae

Table 1 Calculated result using the modified gompertz equation for the cumulative methane production

Series	Treatment^a	Ultimate methane yieldP(ml/g-VS)	Maximum methane production rateR_max(ml/g VS?·?d)	Lag phase λ(d)	R²
Series 1	0%	317.8?±?3.0	23.11?±?0.84	0.83?±?0.20	0.996
	1%	375.4?±?4.4	25.36?±?1.08	1.62?±?0.25	0.996
	5%	387.7?±?5.1	27.38?±?1.32	2.07?±?0.28	0.994
	10%	402.8?±?3.8	33.14?±?1.30	3.61?±?0.21	0.997
Series 2	One-step	316.6?±?5.3	20.36?±?1.21	2.37?±?0.36	0.990
	Two-step	320.6?±?6.5	22.38?±?1.78	0?±?0.44	0.986

a: In series 1, Clostridium thermocellum was added by 0%, 1%, 5% and 10% (v/v) with 2 g VS/L of algal biomass and 3 g VS/L of methanogenic sludge. In series 2, 5% C. thermocellum was added with 3 g VS/L of algal biomass and 2 g VS/L of methanogenic sludge for one-step. For two-step, 3 g VS/L of algal biomass was first incubated with 5% (v/v) of C. thermocellum for hydrogen production and 2 g VS/L of methanogenic sludge was subsequently added to produce methane. The parameter standard error was obtained from the weighted regression.

ISSN: 2731-3654