BioChem - DOS

Hydrogen fermentation of different galactose-glucose compositions during various hydraulic retention times (HRTs)

International journal of hydrogen energy

Kumar, G.; Park, J.H.; Kim, M.S.; Kim, D.H.; Kim, S.H.

This study investigated the effects of sugar composition and hydraulic retention time (HRT) on continuous hydrogen fermentation. Continuously-stirred tank reactors (CSTRs) were inoculated with heat-treated digester sludge and fed with 15 g/L of glucose, galactose and galactose: glucose mixture (8:2 ratio-simulating the hydrolysate composition of macroalgae) at HRTs of 6-24 h. Peak hydrogen production rate (HPR) and hydrogen yield (HY) of 4.49 L/L/d and 1.62 mol/mol glucose<SUB>added</SUB> were attained while using glucose as feedstock at HRTs of 6 and 18 h, respectively. Meanwhile, galactose provided a peak HPR and HY of 2.35 L/L/d and 1.00 mol/mol galactose<SUB>added</SUB> during the HRTs of 12 and 24 h, respectively. In case of mixed sugars (galactose 8: glucose 2) the production performances were inferior to the sole sugar conditions due to the low substrate utilization of less than 65%, which showed a maximal HPR and HY of 2.75 L/L/d and 0.48 mol/mol carbohydrate<SUB>added</SUB> at the HRTs of 6 and 18 h, respectively.

2014

Pergamon Press

0360-3199

1879-3487

39

35

pp.20625-20631

10.1016/j.ijhydene.2014.08.137

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART70673815

Galactose; Glucose; Galactose:Glucose mixture; Hydrogen; Hydraulic retention time