Microbial fuel cells operating on mixed fatty acids
Microbial fuel cells operating on mixed fatty acids
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DOI：
10.1016/j.biortech.2009.09.054
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发表时间：
2010-02-01
影响因子：
11.4
通讯作者：
Rabaey, Korneel
中科院分区：
文献类型：
--
作者：
Freguia, Stefano;Teh, Ee Hoi;Rabaey, Korneel
目前正在制定策略来收集生活废水处理过程中产生的废污泥中的能量。污泥可以水解和发酵，产生挥发性脂肪酸（VFA）的混合物。根据此类发酵流的组成，创建了合成培养基并测试了微生物燃料电池 (MFC) 中的 VFA 转化。在混合 VFA 系统中，主要首选乙酸盐和丙酸盐作为电子供体，产生的功率密度为 49 +/- 1 mW L-NAC(-1)。其他挥发性脂肪酸（丁酸盐/戊酸盐/己酸）也被去除，尽管去除率较低。在单个 VFA 测试中，每个 VFA 都可以被去除，但特别是异丁酸盐不能提供显着的电流生成。 PCR-DGGE 表明微生物群落结构很大程度上取决于饲喂的 VFA，而不是初始接种物。这些群落以变形菌门为主，例如地杆菌属、丛毛单胞菌属、假单胞菌属和球杆菌属。这项研究证明了使用发酵污泥水解产物中的脂肪酸用于当代的可行性。 (C) 2009 Elsevier Ltd. 保留所有权利。
Strategies are being developed to harvest the energy content of the wasted sludge generated from the treatment of domestic wastewater. Sludge can be hydrolysed and fermented, giving a mixture of volatile fatty acids (VFAs). Based on the composition of such a fermented stream, synthetic media were created and tested for VFA conversion in microbial fuel cells (MFCs). Mainly acetate and propionate were preferred as electron donors in the mixed VFA system, which generated a power density of 49 +/- 1 mW L-NAC(-1). The other VFAs (butyrates/valerates/caproic acid) were also removed, albeit at lower rates. In single VFA tests, each VFA could be removed, but particularly i-butyrate did not provide significant current generation. PCR-DGGE indicated that the microbial community structure was highly determined by the fed VFA, rather than by the initial inoculum. The communities were dominated by Proteobacteria such as Geobacter, Comamonas, Pseudomonas and Pelobacter species. This study demonstrated the feasibility of using fatty acids, as present in fermented sludge hydrolysates, for current generation. (C) 2009 Elsevier Ltd. All rights reserved.