River Basin Research Center, Gifu University, 1-1 Yanagido, Gifu City 501-1193, Japan.
Bioresour Technol. 2012 Jun;114:303-7. doi: 10.1016/j.biortech.2012.02.124. Epub 2012 Mar 4.
Air-cathode single chamber microbial fuel cells (MFCs) were operated with swine wastewater. The maximum power density, the maximum current density, the average value of COD-removal efficiency, and the coulombic efficiency were 1-2.3 W/m(2), 6.0-7.0 A/m(2), 76-91%, and 37-47%, respectively. During operation, 70-82% of the phosphorus was removed from the influent, and some precipitations were observed on the surface of the liquid side of the cathodes. The amount of phosphorus contained in these precipitates was estimated to be equivalent 4.6-27% of the influent. The main component of these precipitates was revealed by X-ray diffraction analysis to be struvite. Furthermore, our results indicate that phosphorus in suspended solid form was first dissolved, and then precipitated on the cathode. By scanning electron microscope observation, the morphology of the precipitates was irregularly shaped, including crystals with hexagonal cross-section surfaces, and was different from the familiar needle-like ones. These results indicate that simultaneous recovery of electrical power and phosphorus from wastewater by microbial fuel cell is possible.
空气阴极单室微生物燃料电池（MFC）以猪废水为处理对象进行运行。最大功率密度、最大电流密度、COD 去除效率平均值和库仑效率分别为 1-2.3 W/m(2)、6.0-7.0 A/m(2)、76-91%和 37-47%。在运行过程中，废水中 70-82%的磷被去除，并且在阴极的液相表面观察到一些沉淀物。这些沉淀物中所含的磷估计相当于进水的 4.6-27%。X 射线衍射分析表明，这些沉淀物的主要成分是鸟粪石。此外，我们的结果表明，悬浮固体形式的磷首先溶解，然后在阴极上沉淀。通过扫描电子显微镜观察，沉淀物的形态不规则，包括具有六边形横截面的晶体，与常见的针状不同。这些结果表明，通过微生物燃料电池从废水中同时回收电能和磷是可能的。
