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Fig. 3.3 Hydrogen production yield achieved from different mixing ratio of SLS and POME with
initial organic concentration of 7 g-VS added/L and 21 g-VS added/L, respectively.
3.4.3 Effect of NaHCO 3, Na 2HPO 4.12H 2O and EFB ash concentrations on biohydrogen
production
Batch experiments was conducted to investigate the effects of key factors including
NaHCO 3, Na 2HPO 4.12H 2O, and empty fruit brunch (EFB) ash concentrations on hydrogen
production yield using response surface methodology (RSM). Regression analysis of the data
from Table 3.5 resulted in the quadratic equation (Eq. (3.2)) as follows:
