Avoiding propionic acid accumulation in the anaerobic process for biohydrogen production
Avoiding propionic acid accumulation in the anaerobic process for biohydrogen production
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DOI：
10.1016/j.biombioe.2005.11.010
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发表时间：
2006-02
影响因子：
6
通讯作者：
Lei Wang;Qi Zhou;Fengting Li
中科院分区：
文献类型：
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作者：
Lei Wang;Qi Zhou;Fengting Li
由于丙酸的产乙酸速率低，丙酸在厌氧过程中的积累将导致产甲烷相的低效率，因此导致低的废水处理效率。探讨了产酸相丙酸积累的原因及其与产氢的关系，并提出了避免厌氧产氢过程中丙酸积累的策略。实验结果表明，改变pH和氧化还原电位（ORP）可导致发酵类型的变化，维持较低的ORP和避免pH为5.5可减少厌氧过程中丙酸的积累。较高的生物产氢速率并不总是伴随着丙酸的积累。在两相分离厌氧工艺产酸反应器中，pH值在4.5以下的乙醇型发酵能产生更多的生物氢，但不积累丙酸。因此，乙醇型发酵是一个更好的选择时，使用产酸反应器的两相分离厌氧工艺，以有效地产生生物氢，同时有机废水预处理。
The accumulation of propionic acid in the anaerobic process will result in low efficiency of the methanogenic phase due to the low acetogenic rate of propionic acid, and hence low wastewater treatment efficiency. The reasons for propionic acid accumulation in the acidogenic phase and the relationship between the accumulation and biohydrogen generation were studied and a strategy for avoiding propionic acid accumulation in the anaerobic process for biohydrogen generation is also introduced. The experimental results indicate that changing pH and oxidation–reduction potential (ORP) can result in the variation of fermentation type, and maintaining lower ORP and avoiding pH of 5.5 will reduce the accumulation of propionic acid in the anaerobic process. Higher biohydrogen generation rate is not always accompanied with the accumulation of propionic acid. In the acidogenic reactor of two-phase separated anaerobic process, ethanol type fermentation, in which pH at 4.5 below, can produce much more biohydrogen but without accumulation of propionic acid. Thus, ethanol-type fermentation is a better selection when using an acidogenic reactor of a two-phase separated anaerobic process to efficiently produce biohydrogen with simultaneous organic wastewater pre-treatment.