Advanced Water Management Centre, Gehrmann Building, The University of Queensland, Brisbane, QLD 4072, Australia.
Bioresour Technol. 2010 Feb;101(4):1233-8. doi: 10.1016/j.biortech.2009.09.054. Epub 2009 Oct 24.
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.
正在开发策略以从处理生活污水产生的废弃污泥中获取能源含量。污泥可以水解和发酵，产生挥发性脂肪酸（VFAs）的混合物。基于这种发酵液的组成，为微生物燃料电池（MFC）中的 VFA 转化创建并测试了合成培养基。在混合 VFA 系统中，主要乙酸盐和丙酸盐被用作电子供体，产生的功率密度为 49+/-1 mW L（NAC）（-1）。其他 VFAs（丁酸酯/戊酸酯/己酸）也被去除，尽管去除率较低。在单一 VFA 测试中，每种 VFA 都可以被去除，但特别是异丁酸并没有提供显著的电流生成。PCR-DGGE 表明，微生物群落结构高度取决于进料 VFA，而不是初始接种物。群落主要由 Geobacter、Comamonas、Pseudomonas 和 Pelobacter 等属的 Proteobacteria 主导。这项研究证明了使用发酵污泥水解物中存在的脂肪酸来产生电流的可行性。
