An upflow mode membrane-less microbial fuel cell （ML-MFC） was designed for wastewater treatment. Granular graphite electrodes, which are flexible in size, were adopted in the ML-MFC. Microbes present in anaerobic ac...An upflow mode membrane-less microbial fuel cell （ML-MFC） was designed for wastewater treatment. Granular graphite electrodes, which are flexible in size, were adopted in the ML-MFC. Microbes present in anaerobic activated sludge were used as the biocatalyst and artificial wastewater was tested as substrate. During the electrochemically active microbe enrichment stage, a stable power output of 536 mW.m-3 with reference to the anode volume was generated by the ML-MFC running in batch mode. The voltage output decreased from 203 mV to about 190 mV after the ML-MFC was changed from batch mode to normally continuous mode, indicating that planktonic electrochemically active bacterial strains in the ML-MFC may be carried away along with the effluent. Cyclic voltammograms showed that the attached microbes possessed higher bioelectrochemical activity than the planktonic microbes. Forced aeration to the cathode benefited the electricity generation obviously. Higher feeding rate and longer electrode distance both increased the electricity generation. The coulombic yield was not more than 20% throughout the study, which is lower than that of MFCs with membrane. It is proposed that dissolved oxygen diffused from the cathode to the anode may consume part of the substrate.展开更多
采用Fenton—混凝沉淀法处理锂电池盖板冲洗废水,研究其最佳反应条件,并探讨各因素的影响机理。结果表明:室温条件下,在Fenton反应阶段,30%H_2O_2投加量为12.5 m L/L、FeSO_4·7H_2O投加量为4.0 g/L、pH为2.5、反应时间为1 h时,COD...采用Fenton—混凝沉淀法处理锂电池盖板冲洗废水,研究其最佳反应条件,并探讨各因素的影响机理。结果表明:室温条件下,在Fenton反应阶段,30%H_2O_2投加量为12.5 m L/L、FeSO_4·7H_2O投加量为4.0 g/L、pH为2.5、反应时间为1 h时,COD去除率可达91.81%;Fenton反应出水用PAC混凝沉淀法进行再处理,pH为中性或偏碱性、PAC投加量为80 mg/L条件下,最终出水COD去除率可达93.9%。展开更多
基金Supported by the National Natural Science Foundation of China （20306029, 20576137）.
文摘An upflow mode membrane-less microbial fuel cell （ML-MFC） was designed for wastewater treatment. Granular graphite electrodes, which are flexible in size, were adopted in the ML-MFC. Microbes present in anaerobic activated sludge were used as the biocatalyst and artificial wastewater was tested as substrate. During the electrochemically active microbe enrichment stage, a stable power output of 536 mW.m-3 with reference to the anode volume was generated by the ML-MFC running in batch mode. The voltage output decreased from 203 mV to about 190 mV after the ML-MFC was changed from batch mode to normally continuous mode, indicating that planktonic electrochemically active bacterial strains in the ML-MFC may be carried away along with the effluent. Cyclic voltammograms showed that the attached microbes possessed higher bioelectrochemical activity than the planktonic microbes. Forced aeration to the cathode benefited the electricity generation obviously. Higher feeding rate and longer electrode distance both increased the electricity generation. The coulombic yield was not more than 20% throughout the study, which is lower than that of MFCs with membrane. It is proposed that dissolved oxygen diffused from the cathode to the anode may consume part of the substrate.
