【摘要】 本文构建了2.0L具有微生物隔膜的模块化生物阴极微生物燃料电池(MFC),以实际生活污水为底物,在连续流运行模式中,系统考察了微生物隔膜(MS)在MFC长期运行过程中的功能特征.结果表明:发育成熟的微生物隔膜可以稳定维持MFC阴阳极室间的溶解氧(DO)浓度梯度,使阳极室平均DO浓度低于0.5mg/L,同时使完全混合的阴极室COD浓度低于50mg/L,避免了电解液性质对于电极反应的抑制.微生物隔膜可以实现离子的跨隔膜迁移,进而平衡阴阳极室间的pH值;阴阳极室间存在的跨隔膜离子梯度意味着微生物隔膜完全分隔了两极室内不同的微生物代谢类型,阴极快速的好氧代谢可能导致了阴极室离子强度的降低.微生物隔膜对于MFC中COD和DO梯度的保持以及pH值的平衡起到了决定性作用,这将严格保证MFC的正常运行.同时,本文论述了在面向规模化应用的MFC中装配微生物隔膜的巨大技术与经济优势,综合评价了微生物隔膜的效能特征,为进一步推广面向实际废水处理的微生物电化学设备提供了技术支撑.更多还原

【Abstract】 2 litters modularized biocathode microbial fuel cells(MFCs) with microbial separator(MS) were designed and constructed for raw wastewater treatment in continuous flow mode, while the designed functions of MS were systemically investigated during the long-term operation. It was observed that the restriction of electrode reaction by electrolyte properties could be avoided by mature biofilm developed in MS, while the DO concentration could be well controlled below 0.5 mg/L in anode chamber and COD concentration was also below 50 mg/L in cathode chamber. Besides, the pH value between anode and cathode was also balanced by the ionic across-separator transfer. The low ionic strength of cathode may be caused by rapid aerobic metabolism process, while the difference of ionic across-separator concentration represented the great separating function of MS between anode and cathode chamber. In summary, the stable operation of MFC was attributed to the well-controlled COD, DO, and ionic cross-separator transfer. Furthermore, the technical and economic advantages of microbial separator were discussed and reviewed for pilot-scale application of MFC, which showed significant engineering meaning of practical application for microbial electrochemical equipment.更多还原