Sipma Jan, Lettinga Gatze, Stams Alfons J M, Lens Piet N L
Sub-Department of Environmental Technology, Wageningen University, Bomenweg 2, Post Office Box 8129, 6700 EV Wageningen, The Netherlands.
Biotechnol Prog. 2006 Sep-Oct;22(5):1327-34. doi: 10.1021/bp0601084.
Thermophilic (55 degrees C) sulfate reduction in a gas lift reactor fed with CO gas as the sole electron donor was investigated. The reactor was inoculated with mesophilic granular sludge with a high activity of CO conversion to hydrogen and carbon dioxide at 55 degrees C. Strong competition for H(2) was observed between methanogens and sulfate reducers, while the homoacetogens present consumed only small amounts of H(2). The methanogens appeared to be more sensitive to pH and temperature shocks imposed to the reactor, but could not be completely eliminated. The fast growth rates of the methanogens (generation time of 4.5 h) enabled them to recover fast from shocks, and they rapidly consumed more than 90% of the CO-derived H(2). Nevertheless, steep increases in sulfide production in periods with low methane production suggests that once methanogenesis is eliminated, sulfate reduction with CO-rich gas as electron donor has great potential for thermophilic biodesulfurization.
研究了在以CO气体作为唯一电子供体的气升式反应器中嗜热（55℃）硫酸盐还原过程。该反应器接种了在55℃下具有将CO转化为氢气和二氧化碳高活性的嗜温颗粒污泥。在产甲烷菌和硫酸盐还原菌之间观察到对H₂的强烈竞争，而存在的同型产乙酸菌仅消耗少量H₂。产甲烷菌似乎对施加到反应器的pH和温度冲击更敏感，但不能被完全消除。产甲烷菌的快速生长速率（世代时间为4.5小时）使它们能够从冲击中快速恢复，并且它们迅速消耗了超过90%的源自CO的H₂。然而，在甲烷产量低的时期硫化物产量的急剧增加表明，一旦消除甲烷生成，以富含CO的气体作为电子供体的硫酸盐还原对于嗜热生物脱硫具有很大潜力。
