Effects of initial lactic acid concentration, HRTs, and OLRs on bio-hydrogen production from lactate-type fermentation
| Autor: | Yunhee Lee, Kwang-Hyeon Chang, Sun-Jin Hwang, Tae-Hyeong Kim |
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| Rok vydání: | 2011 |
| Předmět: |
Environmental Engineering
Time Factors Hydraulic retention time Hydrogen Continuous stirred-tank reactor chemistry.chemical_element Bioengineering chemistry.chemical_compound Bioreactors Bioreactor Food science Lactic Acid Waste Management and Disposal In Situ Hybridization Fluorescence Hydrogen production Renewable Energy Sustainability and the Environment General Medicine Lactic acid Kinetics Glucose Biochemistry chemistry Solubility Batch Cell Culture Techniques Yield (chemistry) Biofuels Fermentation |
| Zdroj: | Bioresource technology. 103(1) |
| ISSN: | 1873-2976 |
| Popis: | A batch test and continuous operation were performed to identify the effect of lactate on hydrogen production at pH 4.5. When the initial lactic acid concentration was increased from 0 to 8 g/L in the batch test, the hydrogen yield also increased from 1.41 to 1.72 mol-H2/mol-glucose. The system exhibited a long lag time and an insignificant hydrogen yield with 16 g-lactic acid/L. A continuous stirred tank reactor (CSTR) was operated at different organic loading rates (OLRs: 10, 15, 20 and 40 g/L/day) and hydraulic retention times (HRTs: 6, 12 and 24 h). At an OLR of 20 g-glucose/L/day and 12 h of HRT, the hydrogen yield was 1.2 mol-H2/mol-glucose. The yield decreased with a 24 h HRT. Even though lactate was one of the major constituents of volatile fatty acids (VFAs), hydrogen production was feasible throughout the operation. Clostridium sp. was the dominant hydrogen-producing bacteria in the system. |
| Databáze: | OpenAIRE |
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