BioChem - DOS

Enhancing the performance of dark fermentative hydrogen production using a reduced pressure fermentation strategy

International journal of hydrogen energy

Lee, K.S.; Tseng, T.S.; Liu, Y.W.; Hsiao, Y.D.

The partial pressure of hydrogen is an extremely important factor for hydrogen generation. This study investigated the effect of reduced pressure (via vacuum) on hydrogen production in a CSTR reactor. The results show that the reduced pressure condition is more effective in enhancing H<SUB>2</SUB> production at lower HRT (e.g., 8-4 h) than at higher HRT (e.g., 12 h). The optimal hydrogen yield and overall hydrogen production efficiency occurred at a HRT of 6 h with a value of 4.50 mol H<SUB>2</SUB>/mol sucrose and 56.2%, respectively. Meanwhile, at HRT 6 h the hydrogen production rate was 0.937 mol/L/d. In addition, the HPR could be further improved to 1.196 mol/L/d when the HRT was shortened to 4 h, obtaining a 37-271% increase in HPR when compared with that described in the relevant reports. For all experiments, butyrate and acetate were the two primary soluble metabolites, accounting for 85-99% of total soluble microbial products. Predominant production of acetate and butyrate demonstrates the efficient H<SUB>2</SUB> fermentation with reduced pressure processes.

2012

Pergamon Press ; Elsevier Science Ltd

0360-3199

1879-3487

37

20

pp.15556-15562

10.1016/j.ijhydene.2012.04.039

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART64069827

Biohydrogen production; Dark fermentation; H2 partial pressure; Vacuum operation