초록
A two-stage thermophilic fermentation for hydrogen and methane production from wastewater of cassava rice and corn starch at different concentration (5,10 and 15g/L) was studied. The hydrogen production from cassava starch at concentrations of 5g/L gave the highest hydrogen yield and followed by cassava starch at a concentration 10g/L, rice starch at concentrations of 15g/L. The hydrogen and methane yields from cassava starch processing wastewater by two-stage was 81.5 L H<SUB>2</SUB> kgCOD<SUP>-1</SUP> and 310.5 L CH<SUB>4</SUB> kgCOD<SUP>-1</SUP>, respectively with total energy yield of 13363kJ kgCOD<SUP>-1</SUP>. Mixed hydrogen and methane (biohythane) production was 9.51 L biogas l<SUP>-1</SUP> with containing of 55% CH<SUB>4</SUB>, 11% H<SUB>2</SUB> and 34% CO<SUB>2</SUB>.