Fe^(2+)对UASB厌氧发酵效能的影响研究

Effects of Ferrous Ion on Anaerobic Fermentation Capacity of UASB Reactor

以蔗糖为底物,通过UASB反应器外加铁源的对照试验,研究了Fe^(2+)在7~15 mg/L的范围内对厌氧发酵过程的影响。结果表明,Fe^(2+)对厌氧发酵有一定的促进作用。随着Fe^(2+)浓度的升高,COD去除率由86.3%提高至90.6%。厌氧发酵受抑制时,Fe^(2+)浓度较高的UASB推迟发生严重酸化的时间。经测定UASB反应器出水的铁含量始终小于1 mg/L。进水Fe^(2+)浓度降低后,厌氧污泥中的铁含量也随之降低。对荧光光谱图的解析表明,随着Fe^(2+)浓度的增加,出水中类蛋白、辅酶F420和类胡敏酸的荧光强度显著增强,且解析得到的色氨酸、酪氨酸、辅酶NADH和辅酶F420的荧光强度得分均有所提高。

Using sucrose as a substrate, the effect of Fe^2＋ （ranging from 7 to 15 rag/L）in anaerobic fermentation was studied by control experiments of iron addition in upflow anaerobic sludge blanket （UASB） reactor. The results showed that Fe^2＋ could enhance the anaerobic fermentation. The removal of COD was improved from 86.3% to 90.6% with an increase in Fe^2＋ concentration. When the anaerobic fermentation process was inhibited, severe acidification was postponed in the UASB with a higher concentration of Fe^2＋. The concentration of iron in the effluent of the UASB reactor was always less than 1 mg/ L. Iron content in the sludge declined with the decrease of the Fe^2＋ concentration in influent. Adding Fe^2＋ led to the enhancement of fluorescence intensity of protein, coenzyme F420, and humic acids. The fluorescence intensity of tryptophan, tyrosine, coenzyme F420 and coenzyme NADH were also intensified through analyzing fluorescence spectra results.