In recent decades, the generation of bioenergy from wastes as a cost-effective and environmentally friendly source has attracted the attention of researchers. Among waste materials, sewage sludge contains a high amount of organic matter that can be stabilized and converted directly into electricity via microbial fuel cells. Here in this study, the effects of different concentrations of mixed liquor suspended solid (MLSS) and initial chemical oxygen demand (COD) concentration of the municipal sewage sludge (secondary excess sludge) on the electricity generation in an air cathode microbial fuel cells (MFCs) have been investigated. The results confirmed significant effects of MLSS and COD on the sludge stabilization and power generation. The secondary excess sludge when MLSS was 10000 mgL⁻¹ produced maximum power density and current density of 27.65 Wm^-3 and 473.5 mAm⁻³, respectively. The maximum MLSS removal efficiency for aerobic and anaerobic compartments was 50% and 36%, respectively. This result represented that the applied MFC is suitable for treating secondary excess sludge and energy recovery. Furthermore, the process in the cathode chamber was more efficient for sludge stabilization than the anodic process.

近几十年来，由废物产生的生物能源作为具有成本效益和对环境友好的资源已引起了研究人员的关注。在废物中，污水污泥包含大量有机物，这些有机物可以稳定下来并通过微生物燃料电池直接转化为电能。在此研究中，不同浓度的混合液悬浮固体（MLSS）和城市污水污泥（二次过量污泥）的初始化学需氧量（COD）浓度对空气阴极微生物燃料电池（MFCs）发电的影响）已被调查。结果证实了MLSS和COD对污泥稳定和发电的显着影响。MLSS为10000 mgL ^-1时的二次过量污泥产生的最大功率密度和电流密度分别为27.65 Wm ^-3和473.5 mAm ^-3。有氧和厌氧隔室的最大MLSS去除效率分别为50％和36％。该结果表明，所应用的MFC适合于处理二次过量污泥和能量回收。此外，在阴极室中进行污泥稳定处理要比阳极处理更为有效。