【摘要】 着重对发酵法生物制氢反应系统的丁酸型发酵的运行稳定性进行了研究分析。结果表明,在有机负荷大于21kgCOD/m3·d的条件下,丁酸型发酵具有不稳定性,在负荷冲击下容易转变为丙酸含量较高的发酵类型,从而导致系统产氢能力的下降。分析认为,NADH/NAD+的平衡调节能力是影响系统运行稳定性的一个关键因素。在高负荷条件下,由于丁酸型发酵的产丁酸过程不能氧化过剩的NADH+H+,导致产乙酸过程生成的剩余NADH+H+在系统内大量积累,使反应系统难以达到氧化还原的平衡状态,最终影响了系统的稳定运行。更多还原

【Abstract】 The operational stability of butyric acid type fermentation was investigated in H2-producing process by fermentation. Butyric acid type fermentation was unstable when organic loading rate (OLR) was over 21kgCOD/m3·d. Another fermentation type would be transferred with higher propionic acid production and less hydrogen production at a shock loading. The ability of regulation equilibrium of NADH/NAD+ was a key factor affecting operational stability of hydrogen production system. The butyric acid producing pathway could not oxidize the excessive NADH+H+ , the accumulation of NADH+H+ occurred under high OLR condition. The unbalance of NADH/NAD+ was affected stable operation of the system eventually.更多还原