Enhanced hydrogen production from waste activated sludge by cascade utilization of organic matter in microbial electrolysis cells
Enhanced hydrogen production from waste activated sludge by cascade utilization of organic matter in microbial electrolysis cells
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通过微生物电解池中有机物的梯级利用提高废活性污泥的产氢能力
DOI：
10.1016/j.watres.2011.11.073
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发表时间：
2012-03-15
期刊：
影响因子：
12.8
通讯作者：
Ren, Nanqi
中科院分区：
文献类型：
--
作者：
Lu, Lu;Xing, Defeng;Ren, Nanqi
利用废活性污泥（WAS）发酵制氢的H-2产率低，因为WAS中含有少量适合产氢细菌使用的碳水化合物。在这里，通过微生物电解细胞（MECs）来提高WAS的产氢量。在双室MECs （TMECs）中，原WAS的H-2产率为3.89 +/- 0.39 mg-H-2/g-DS (5.67 +/- 0.61 mg-H-2/g-VSS)，碱预处理WAS的H-2产率为6.78 +/- 0.94 mg-H-2/g-VSS （15.08 +/- 1.41 mg-H-2/g-VSS）。这比以前通过发酵获得的产量高出几倍。内阻较低的单室mec （SMECs）的H-2产率是碱预处理WAS时相似H-2产率的13倍。然而，在几个批次循环后检测到甲烷生成。产率平衡计算表明，碳水化合物不是电氢生成的唯一底物。蛋白质及其酸化产物，如挥发性脂肪酸，也是MEG中H-2生成的一部分原因。三维激发-发射矩阵（EEM）荧光光谱与平行因子分析表明，细胞外聚合物和细胞内物质发生了电氢反应。MEcs中有机物的级联利用增加了WAS的产氢量。MECs具有WAS产氢率高、H-2汇少、对温度不敏感等特点。优化MEG的配置和操作条件，改进WAS的预处理工艺是实现大规模实际应用的必要条件。(C) 2011 Elsevier Ltd.版权所有。
Fermentative hydrogen production from waste activated sludge (WAS) has low H-2 yield because WAS contains limited amounts of carbohydrate suitable for use by hydrogen-producing bacteria. Here, augmentation of hydrogen production from WAS by microbial electrolysis cells (MECs) was implemented. H-2 yields of 3.89 +/- 0.39 mg-H-2/g-DS (5.67 +/- 0.61 mg-H-2/g-VSS) from raw WAS and 6.78 +/- 0.94 mg-H-2/g-DS (15.08 +/- 1.41 mg-H-2/g-VSS) from alkaline-pretreated WAS were obtained in the two-chamber MECs (TMECs). This was several times higher than yields obtained previously by fermentation. Single-chamber MECs (SMECs) with low internal resistance showed a H-2 production rate that 13 times that of TMECs with similar H-2 yield when alkaline-pretreated WAS was used. However, methanogenesis was detected after several batch cycles. A yield balance calculation revealed that carbohydrates were not the only substrates for electrohydrogenesis. Protein and its acidification products, such as volatile fatty acids are also responsible for a portion of H-2 generation in MEG. Characterization of WAS in TMECs by three-dimensional excitation-emission matrix (EEM) fluorescence spectroscopy with parallel factor analysis indicated that electrohydrogenesis reacted on the extracellular polymeric substances and intracellular substances of WAS. Cascade utilization of organic matter in MEcs increased hydrogen production from WAS. MECs showed high hydrogen yield from WAS, fewer H-2 sinks, and insensitivity to temperature. Optimizing MEG configurations and operation conditions and improving the pretreatment processes of WAS are necessary before practical application can take place on a large scale. (C) 2011 Elsevier Ltd. All rights reserved.