二价铁离子对UASB反应器厌氧发酵产氢效能的影响

金属离子Fe2+在生物产氢机制中起着重要作用.以红糖为底物,研究了Fe2+在0～1 650 mg·L-1范围内对UASB发酵产氢效能的影响.结果表明,适当浓度的二价铁离子对产氢具有一定的促进作用.当Fe2+浓度为0～450 mg·L-1时,发酵产气量及其氢气含量都随着Fe2+浓度的增加而增加;且当Fe2+浓度为450 mg·L-1时,获得最大生物气体积为17.72 L,较空白组提高了40.75%,此时氢气含量60.01%.而当外加的Fe2+浓度大于450 mg·L-1时,则开始呈下降趋势.因此,Fe2+可以成为调控发酵制氢的工程措施之一.

Effect of Fe2+ on Fermentation Hydrogen Production in an UASB

Fe²⁺ has an important effect on the production of hydrogen in a biological way. With the brown sugar as the substrate, the effect of biotechnology hydrogen production capacity of the Fe²⁺ concentration ranging from 0-1650 mg·L^-1 on the condition of anaerobic fermentation was studied. The results showed that appropriate divalent ions had the ability to enhance the hydrogen production. Biogas amounts and hydrogen content increased with increasing Fe²⁺ concentration from 0-450 mg·L^-1. Compared with the control group increased by 40.75%, the maximum biogas amount of 17.72 L was obtained at Fe²⁺ concentration of 450 mg·L^-1. And at the same time,the hydrogen content was 60.01 percent. Biogas amounts and hydrogen content decreased gradually when the concentration of Fe²⁺ was higher than 450 mg·L^-1. Therefore Fe²⁺ is one of important engineering parameters for the fermentative hydrogen production.