Improved Hydrogen Production in the Microbial Electrolysis Cell by Inhibiting Methanogenesis Using Ultraviolet Irradiation
Improved Hydrogen Production in the Microbial Electrolysis Cell by Inhibiting Methanogenesis Using Ultraviolet Irradiation
复制标题
通过紫外线照射抑制产甲烷作用提高微生物电解池的产氢量
DOI：
10.1021/es501202e
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发表时间：
2014-09-02
影响因子：
11.4
通讯作者：
Fu, Shiyu
中科院分区：
文献类型：
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作者：
Hou, Yanping;Luo, Haiping;Fu, Shiyu
抑制甲烷生成是提高微生物电解池（MEC）氢（H-2）产率和能量回收率的必要条件。在本研究中，提出了紫外（UV）照射作为控制单室MEC产甲烷的有效方法。在MEC中，紫外线照射30个循环后，H-2浓度保持在较高水平（约91%），而没有紫外线照射时，CH4浓度显著升高，最高可达94%。在MEC中，UV照射下H-2产率在2.87 +/- 0.03 ~ 3.70 +/- 0.11 mol H-2/mol醋酸酯之间，无UV照射时H-2产率在3.78 +/- 0.12 ~ 0.03 +/- 0.004 mol H-2/mol醋酸酯之间。受到紫外线照射的MEC的平均能源效率是没有受到紫外线照射的MEC的1.5倍。在没有紫外线照射的情况下，MEC的产能是一个负产能过程，因为随着时间的推移产生了大量的CH4，这主要是由于阴极氢营养化甲烷生成。我们的研究结果清楚地表明，紫外线照射可以有效地抑制甲烷的发生，提高MEC生产H-2的性能。
Methanogenesis inhibition is essential for the improvement of hydrogen (H-2) yield and energy recovery in the microbial electrolysis cell (MEC). In this study, ultraviolet (UV) irradiation was proposed as an efficient method for methanogenesis control in a single chamber MEC. With 30 cycles of operation with UV irradiation in the MEC, high H-2 concentrations (>91%) were maintained, while without UV irradiation, CH4 concentrations increased significantly and reached up to 94%. In the MEC, H-2 yields ranged from 2.87 +/- 0.03 to 3.70 +/- 0.11 mol H-2/mol acetate with UV irradiation and from 3.78 +/- 0.12 to 0.03 +/- 0.004 mol H-2/mol acetate without UV irradiation. Average energy efficiencies from the UV-irradiated MEC were 1.5 times of those without UV irradiation. Energy production from the MEC without UV irradiation was a negative energy yield process because of large amount of CH4 produced over time, which was mainly attributable to cathodic hydrogenotrophic methanogenesis. Our results clearly showed that UV irradiation could effectively inhibit methanogenesis and improve MEC performance to produce H-2.