采用由有机玻璃制成的上流式厌氧污泥床反应器(UASB),以糖蜜废水为发酵底物,投加适量氯化铵和磷酸二氢钾,研究在低pH值下系统的产氢性能.在系统启动初期,投加碳酸氢钠控制进水pH=6.75-7.15,使系统处于中性厌氧发酵,固定进水COD为4000 mg· L-1,HRT=8 h.系统运行20 d后,系统处于混合型发酵类型,随后停止投加碳酸氢钠.系统经过45 d的运行,乙醇和乙酸浓度占总浓度的79.39％,而丙酸的浓度只占总浓度的10.89％,形成了稳定的典型乙醇型发酵.第65天,乙醇和乙酸的浓度分别为840.56 mg· L-1、403.12 mg·L-1,乙醇与乙酸浓度占总浓度的93.2％,氢气含量为86.97％.在出水pH=2.81时,系统产氢性能最佳.氢气产率为2.079 mmol· L-1·h-1,氢气产量1.12 m3·m-3·d-1,氢气含量91.46％,是稳定期氢气含量的1.65倍.
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