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  1. Pattra S, Sureewan Sittijunda
    Sains Malaysiana, 2017;46:51-58.
    Response surface methodology (RSM) with central composite design (CCD) was applied to optimize key factors affecting
    hydrogen production (HP) from diluted acid hydrolysate of water-hyacinth stem (WHS) by heat-treated anaerobic sludge
    in a batch fermentation process. Key factors affecting namely substrate concentration and initial pH was investigated.
    The results indicated that substrate concentration and initial pH had significantly effects on HP (p<0.05). A maximum HP
    hydrogen production rate and hydrogen yield of 182.7 mmol H2
    /L, 2.81 mmol H2
    /L h and 0.84 mol H2
    /mol hexose were
    obtained under the optimum conditions i.e. substrate concentration of 4.06 g/L and initial pH of 5.81. The total energy
    production from the fermentative of WHS hydrolysate was 1.97 kJ.
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