Thermophilic dark fermentation of acid hydrolyzed waste ground wheat for hydrogen gas production

✍ Scribed by Serpil Ozmihci; Fikret Kargi; Ayse Cakir

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 562 KB
• Volume: 36
• Category: Article
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2010.11.033

✦ Synopsis

Batch dark fermentation experiments were performed to investigate the effects of biomass and substrate concentration on bio-hydrogen production from acid hydrolyzed ground wheat at 55 C. In the first set of experiments, the substrate concentration was constant at 20 g total sugar L À1 and biomass concentration was varied between 0.52 and 2.58 g L À1 .

Total sugar concentration was varied between 4.2 and 23.7 g L À1 in the second set of experiments with a 1.5 g L À1 constant biomass concentration. The highest cumulative hydrogen formation (582 mL, 30 C, 1 atm), formation rate (5.43 mL h À1 ) and final total volatile fatty acid (TVFA) concentration (6.54 g L À1 ) were obtained with 1.32 g L À1 biomass concentration. In variable substrate concentration experiments, the highest cumulative hydrogen (365 mL) and TVFA concentration (4.8 g L À1 ) were obtained with 19.25 g L À1 initial total sugar concentration while hydrogen gas formation rate (12.95 mL h À1 ) and the yield (200 mL H 2 g À1 total sugar) were the highest with 4.2 g L À1 total sugar concentration.