The effects of antifoaming agents on fermentative hydrogen production using galactose in batch and continuous operations were investigated. Batch hydrogen production assays with LS-303 (dimethylpolysiloxane), LG-109 (polyalkylene), LG-126 (polyoxyethylenealkylene), and LG-299 (polyether) showed that the doses and types of antifoaming agents played a significant role in hydrogen production. During batch tests, LS-303 at 100 μL/L resulted in the maximum hydrogen production rate (HPR) and hydrogen yield (HY) of 2.5 L/L-d and 1.08 mol H2/mol galactoseadded, respectively. The following continuously stirred tank reactor operated at 12 h HRT with LS-303 at 100 μL/L showed a stable HPR and HY of 4.9 L/L-d and 1.17 mol H2/mol galactoseadded, respectively, which were higher than those found for the control reactor. Microbial community analysis supported the alterations in H2generation under different operating conditions and the stimulatory impact of certain antifoaming chemicals on H2production was demonstrated.
All Science Journal Classification (ASJC) codes
- Environmental Engineering
- Renewable Energy, Sustainability and the Environment
- Waste Management and Disposal