【作者】 白艳霞； 李小虎； 樊耀亭； 侯红卫；

【Author】 Yanxia Bai;Xiaohu Li;Yaoting Fan;Hongwei Hou;The College of Chemistry and Molecular Engineering,Zhengzhou University;

【机构】 郑州大学化学与分子工程学院；

【摘要】 利用微生物电解池(MEC)技术可以将含糖和淀粉类废水、VFAs及醇类废水高效转化为清洁氢能,由此已引起人们浓厚的研究兴趣,最近已相继有文献报道。为了探讨MEC的产氢机制,本文以葡萄糖作为模型化合物,利用单室双阳极MEC反应器,对MEC产氢的关键参数进行了优化分析。在本文最佳条件下,在0.5V外加电压下,获得了7.2mol H2/mol-glucose的氢产量,产氢速率达到1.65±0.11m3/m3·d,当外加电压增大至0.8V时,氢产量和产氢速率分别达到了8.4 molH2/mol-glucose和2.39±0.3m3/m3·d,大大高于文献数据。动力学研究表明:葡萄糖在反应开始后的4h已消耗殆尽,VFAs含量随着反应时间的增加逐渐增加,达到最大值后呈逐渐减小趋势。生物膜和电极之间的电子传递主要是由生物膜中细菌细胞上的氧化还原物质(如与外膜结合的细胞色素)所控制,而非游离态的电子介体。更多还原

【Abstract】 In this paper, the single-chamber MECs with double anode arrangement were used to be evaluate bio-hydrogen production from glucose. The key operational parameters to effect MEC hydrogen production were optimized in the batch tests. A hydrogen yield of 7.2molH 2/mol-glucose was obtained at a rate of 1.65±0.11m3/m3·d(Eap=0.5V). When applied voltage increased to 0.8V, the hydrogen yield rose to 8.4mol H2 /mol-glucose, a nearly increase of 17%. At the same time the rate reached 2.39±0.3m3/m3·d, which was much higher than other reporters. The contents of glucose and VFAs(such as acetate, propionate, butyrate and ethanol) in bioreactor were analyzed by measurements of the liquid phase composition at each time interval. Glucose was almost removed within 4h. CVs analysis indicated that the main electron transfer in MEC was due to biofilm-bound redox compounds(e.g. outer-membrane bound cytochromes) rather than soluble electron shuttles.更多还原