School of Infrastructure, Indian Institute of Technology Bhubaneswar, Argul, Khordha, Odisha 752050, India.
Water Sci Technol. 2021 Jul;84(1):66-76. doi: 10.2166/wst.2021.213.
Ceramic separators have recently been investigated as low-cost, robust, and sustainable separators for application in microbial fuel cells (MFC). In the present study, an attempt was made to develop a low-cost MFC employing a clayware ceramic separator modified with silica. The properties of separators with varying silica content (10%-40% w/w) were evaluated in terms of oxygen and proton diffusion. The membrane containing 30% silica exhibited improved performance compared to the unmodified membrane. Two identical MFCs, fabricated using ceramic separators with 30% silica content (MFC) and without silica (MFC), were operated at hydraulic retention time of 12 h with real rice mill wastewater with a chemical oxygen demand (COD) of 3,200 ± 50 mg/L. The maximum volumetric power density of 791.72 mW/m and coulombic efficiency of 35.77% was obtained in MFC, which was 60.4% and 48.5%, respectively, higher than that of MFC. The maximum COD and phenol removal efficiency of 76.2% and 58.2%, respectively, were obtained in MFC. MFC fabricated with modified ceramic separator demonstrated higher power generation and pollutant removal. The presence of hygroscopic silica in the ceramic separator improved its performance in terms of hydration properties and proton transport.
陶瓷隔膜最近作为低成本、坚固且可持续的微生物燃料电池 (MFC) 隔膜受到了研究。本研究尝试采用经过二氧化硅改性的陶土陶瓷隔膜来开发低成本的 MFC。根据氧和质子的扩散情况，评估了不同二氧化硅含量（10%-40%w/w）的隔膜的性能。与未改性的膜相比，含有 30%二氧化硅的膜表现出了更好的性能。使用含有 30%二氧化硅的陶瓷隔膜（MFC）和不含二氧化硅的陶瓷隔膜（MFC）制造了两个相同的 MFC，在水力停留时间为 12 小时的情况下，以化学需氧量（COD）为 3200±50mg/L 的实际米厂废水进行操作。在 MFC 中获得了 791.72mW/m 的最大体积功率密度和 35.77%的库仑效率，分别比 MFC 高 60.4%和 48.5%。在 MFC 中分别获得了 76.2%和 58.2%的最大 COD 和苯酚去除效率。用改性陶瓷隔膜制造的 MFC 表现出更高的发电和污染物去除效率。陶瓷隔膜中吸湿二氧化硅的存在改善了其水合性能和质子传输性能。
