BioChem - DOS

Metabolic and energetic aspects of biohydrogen production of Clostridium tyrobutyricum: The effects of hydraulic retention time and peptone addition

Bioresource technology : biomass, bioenergy, biowastes, conversion technologies, biotransformations, production technologies

Whang, Liang-Ming; Lin, Che-An; Liu, I-Chun; Wu, Chao-Wei; Cheng, Hai-Hsuan

<P><B>Abstract</B></P><P>This study evaluates the microbial metabolism and energy demand in fermentative biohydrogen production using <I>Clostridium tyrobutyricum</I> FYa102 at different hydraulic retention times (HRT) over a period of 1&ndash;18h. The hydrogen yield shows a positive correlation with the butyrate yield, the <I>B</I>/<I>A</I> ratio, and the <SUB>YH2</SUB>/2(<SUB>YHAc</SUB>+<SUB>YHBu</SUB>) ratio, but a negative correlation with the lactate yield. A decrease in HRT, which is accompanied by an increased biomass growth, tends to decrease the <I>B</I>/<I>A</I> ratio, due presumably to a higher energy demand for microbial growth. The production of lactate at a low HRT, however, may involve an unfavorable change in e<SUP>&minus;</SUP> equiv distribution to result in a reduced hydrogen production. Finally, the relatively high hydrogen yields observed in the bioreactor with the peptone addition may be ascribed to the utilization of peptone as an additional energy and/or amino-acid source, thus reducing the glucose demand for biomass growth during the hydrogen production process.</P>

2011

0960-8524

102

18

pp.8378-8383

10.1016/j.biortech.2011.03.101

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART57183104

Butyrate; Lactate; B/A ratio; YH2/2(YHAc+YHBu) ratio; Energy demand