碩士 / 逢甲大學 / 綠色能源科技碩士學位學程 / 102 / The biohydrogen production performance was investigated in both bioreactors. One is continuously stirred biohydrogen reactor (CSABR), and the other one is egg-shaped external circulation hydrogen production bioreactor (EEC-HPBR) by sugary wastewater substrate in this study. It was found that the biohydrogen production rate in EEC-HPBR was higher than that in CSABR when the hydraulic retention time (HRT) was varied from 8 to 2 h. This was due to the fact that the EEC-HPBR had a well mixing and less of the dead zone in the bioreactor by the external circulation system. However, the fast external circulation system resulted in the granular bioparticle cannot be easily formed in the bioreactor when the HRT was 1 h. Therefore, the wash-out phenomena appeared at HRT 1 h which resulted in operation failure of the EEC-HPBR. The hydrodynamic properties such as the bubble diameter bubble, rising velocity and phase holdups were conducted in a 2-D bioreactor to simulate the real 3-D bioreactor. The seed sludge in 2-D bioreactor was from the CSABR at the same operational condition with the substrate concentration of 20 g total sugar/L. It was found that the average bubble diameter was 0.33 mm with a mild change during the HRT from 8 to 1 h. The bubble rising velocity increased with linearly increasing of the substrate feeding rate. The gas (εg ) and solid (εs ) phase-holdups increased with decreasing of the liquid (εl ) phase-holdup when HRT was decreased. This was due to the fact that the biogas production rate increased with the organic loading rate increasing in the bioreactor when the HRT decreased. The bubble formed in the bioreactor was from the biogas production by the organic matter degradation. The flow regime and mass transfer effects will change according the bubble hydrodynamic properties in the bioreactor. Finally, this study reveals the parameters such as bubble diameter, bubble rising velocity and phase-holdups in biohydrogen production reactor for steady-state operation of the scaled-up bioreactor from sugary wastewater.
| Identifer | oai:union.ndltd.org:TW/102FCU05160008 |
| Date | January 2014 |
| Creators | Hsin Lo, 羅 欣 |
| Contributors | Chen-Yeon Chu, 朱正永 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 131 |
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