The sparging effect on H2 production was studied. Continuous-flow stirred-tank reactors were operated using different sparging gases (biogas, CO2, N2) at various flow rates (100, 200, 300, 400 mL/min). External gas sparging showed a higher H2 production than internal and no sparging, suggesting that decrease of H2 partial pressure by external gas sparging has a beneficial effect on N2 fermentation. CO2 sparging showed a higher performance than N2 sparging in spite of low biomass concentration and glucose removal. Concentration and composition of butyrate, the main metabolic product of Clostridium sp., was higher in CO2 sparging. The isolated microorganisms in N2 sparging were very similar to control (no sparging) and internal biogas sparging, indicating that the increase of H2 production by N2 gas sparging was due to only the physical effect of lowering down N2 partial pressure without changing microbial community. This is an abstract of a paper presented at the 228th ACS National Meeting (Philadelphia, PA 8/22-26/2004).
|Number of pages||5|
|Journal||ACS, Division of Environmental Chemistry - Preprints of Extended Abstracts|
|Publication status||Published - 2004|
|Event||228th ACS National Meeting - Philadelphia, PA, United States|
Duration: 2004 Aug 22 → 2004 Aug 26
All Science Journal Classification (ASJC) codes