以氮掺杂石墨烯(NG)催化微生物燃料电池(MFCs)的阴极,同时多级串并联方式连接MFCs与流动电极电容去离子(FCDI)装置,用以处理含盐废水。结果表明,NG-MFCs的产电脱氮性能明显提升,其最大输出电压为523 m V,NH_4^+-N的去除率达到92.7%;并...以氮掺杂石墨烯(NG)催化微生物燃料电池(MFCs)的阴极,同时多级串并联方式连接MFCs与流动电极电容去离子(FCDI)装置,用以处理含盐废水。结果表明,NG-MFCs的产电脱氮性能明显提升,其最大输出电压为523 m V,NH_4^+-N的去除率达到92.7%;并联方式下的MFCs产电输出更加稳定,处理Na Cl质量浓度2 g/L的盐溶液,MFCs-FCDI装置的除盐率达到30%。因此,NG-MFCs以其输出能量FCDI进行除盐,可达到能源利用与污水处理的双重效果。展开更多
A microbial fuel cell （MFC） is a device that converts chemical energy to electrical energy during substrate oxidation by microorganisms. The characterization and identification of these microbial communities will al...A microbial fuel cell （MFC） is a device that converts chemical energy to electrical energy during substrate oxidation by microorganisms. The characterization and identification of these microbial communities will allow better control of this electricity generation with simultaneous removal of carbon and nitrogen. This study aims to investigate the role of natural bacteria in electricity generation by studying three different sources of wastewater： the raw wastewater （RW）, wastewater from an aeration tank （AEW） and returned activated sludge （RAS） from an activated sludge treatment plant. The result showed that after the MFC treatment, the number of bacterial strains was reduced from twenty strains to eight strains. Microscopic observation further showed that fifteen isolate before the treatment were gram-positive, and five were gram-negative whereas all isolates after the treatment were gram-positive rods or cocci The four strains isolated from the RAS inoculums, β-Comamonas sp., γ-Enterobacter sp., Bacillus cereus sp. and Clostridium sp. produced the highest power density of 67.57 mW/m^2 which made them potential candidates for electrochemically active bacteria in MFCs. However, the level of chemical oxygen demand （COD） removal was 20% and the total kjeldahl nitrogen （TKN） removal was 66.7%. Key words：展开更多
Recently microbial fuel cells (MFCs) have been considered as an alternative power generation technique by utilizing organic wastes. In this study, an experiment was carried out to generate bioelectricity from co-diges...Recently microbial fuel cells (MFCs) have been considered as an alternative power generation technique by utilizing organic wastes. In this study, an experiment was carried out to generate bioelectricity from co-digestion of organic waste (kitchen waste) and sewage sludge as a waste management option using microbial fuel cell (MFC) in anaerobic process. A total of five samples with different sludge-waste ratio were used with zinc (Zn) and cupper (Cu) as cell electrodes for the test. The trends of voltage generation were different for each sample in cells such as 350 mV, 263 mV, 416 mV maximum voltage were measured from sample I, II and III respectively. It was observed that the MFC with sewage sludge showed the higher values (around 960 mV) of voltages with time whereas 918 mV obtained with organic waste. Precisely comparing cases with varying the organic waste and sewage sludge ratio helps to find the best bioelectricity generation option. Using MFCs can be appeared as the solution of electricity scarcity along the world as an efficient and eco-friendly manner as well as organic solid waste and sewage sludge management.展开更多
Microbial fuel cell(MFC)coupled constructedwetland(CW)is regarded as a promising green technology due to its simultaneous removal performance for the co-occurrence of various contaminants in wastewater.In this study,t...Microbial fuel cell(MFC)coupled constructedwetland(CW)is regarded as a promising green technology due to its simultaneous removal performance for the co-occurrence of various contaminants in wastewater.In this study,the simultaneous removal performance of sulfamethazine(SMZ)and hexavalent chromium Cr(VI)in the CW and MFC-CW systems was investigated.The removal efficiencies of total nitrogen(N),total phosphorus(P),and chemical oxygen demand(COD)were also examined.The results demonstrated that Cr(VI)was effectively eliminated with an excellent removal efficiency of>98.0%,followed by SMZ with a removal efficiency of 70.3%-85.6%.Additionally,during the long-term operation period,the average removal efficiency for N,P,and COD ranged from 74.0%to 96.1%,83.6%to 94.1%,and 91.1%to 95.3%,respectively.The microbial community and antibiotic resistance genes(ARGs)in the anode and cathode were also analyzed separately to evaluate the SMZ and Cr(VI)removal performance of MFC-CW.The abundance of corresponding ARGs was slightly different in the anode and cathode regions.The average abundance of sul4 in the SMZ+Cr(VI)treatment MFC-CW was significantly higher than that of other sul1-3.This study offers valuable insights for the simultaneous removal of SMZ and Cr(VI)from wastewater by MFC-CW.展开更多
Owing to their high flexibility and directional actuation capabilities,macro fiber composites(MFCs)have attracted significant attention for the active control of structures,especially in the nonlinear vibration suppre...Owing to their high flexibility and directional actuation capabilities,macro fiber composites(MFCs)have attracted significant attention for the active control of structures,especially in the nonlinear vibration suppression applications for large-scale flexible structures.In this paper,an MFC-based self-feedback system is introduced for the active control of geometrically nonlinear steady-state forced vibrations in functionally graded carbon nanotube reinforced composite(FG-CNTRC)plates subject to transverse mechanical loads.Based on the first-order shear deformation theory and the von Kármán nonlinear strain-displacement relationship,the nonlinear vibration control equations of the plate with MFC sensor and actuator layers are derived by Hamilton's principle.These equations are discretized by the finite element method(FEM),and solved by the Newton-Raphson and direct iterative methods.A velocity feedback control algorithm is introduced,and the effects of the control gain and the MFC actuator position on the nonlinear vibration active control effectiveness are analyzed.Additionally,a nonlinear resonance analysis is carried out,considering the effects of carbon nanotube(CNT)volume fraction and distribution type.The results indicate that the intrinsic characteristics of the structures significantly influence the vibration behavior.Furthermore,the appropriate selections of control gain and MFC position are crucial for the effective active control of the structures.The present work provides a promising route of the active and efficient nonlinear vibration suppression for various thin-walled structures.展开更多
文摘以氮掺杂石墨烯(NG)催化微生物燃料电池(MFCs)的阴极,同时多级串并联方式连接MFCs与流动电极电容去离子(FCDI)装置,用以处理含盐废水。结果表明,NG-MFCs的产电脱氮性能明显提升,其最大输出电压为523 m V,NH_4^+-N的去除率达到92.7%;并联方式下的MFCs产电输出更加稳定,处理Na Cl质量浓度2 g/L的盐溶液,MFCs-FCDI装置的除盐率达到30%。因此,NG-MFCs以其输出能量FCDI进行除盐,可达到能源利用与污水处理的双重效果。
文摘A microbial fuel cell （MFC） is a device that converts chemical energy to electrical energy during substrate oxidation by microorganisms. The characterization and identification of these microbial communities will allow better control of this electricity generation with simultaneous removal of carbon and nitrogen. This study aims to investigate the role of natural bacteria in electricity generation by studying three different sources of wastewater： the raw wastewater （RW）, wastewater from an aeration tank （AEW） and returned activated sludge （RAS） from an activated sludge treatment plant. The result showed that after the MFC treatment, the number of bacterial strains was reduced from twenty strains to eight strains. Microscopic observation further showed that fifteen isolate before the treatment were gram-positive, and five were gram-negative whereas all isolates after the treatment were gram-positive rods or cocci The four strains isolated from the RAS inoculums, β-Comamonas sp., γ-Enterobacter sp., Bacillus cereus sp. and Clostridium sp. produced the highest power density of 67.57 mW/m^2 which made them potential candidates for electrochemically active bacteria in MFCs. However, the level of chemical oxygen demand （COD） removal was 20% and the total kjeldahl nitrogen （TKN） removal was 66.7%. Key words：
文摘Recently microbial fuel cells (MFCs) have been considered as an alternative power generation technique by utilizing organic wastes. In this study, an experiment was carried out to generate bioelectricity from co-digestion of organic waste (kitchen waste) and sewage sludge as a waste management option using microbial fuel cell (MFC) in anaerobic process. A total of five samples with different sludge-waste ratio were used with zinc (Zn) and cupper (Cu) as cell electrodes for the test. The trends of voltage generation were different for each sample in cells such as 350 mV, 263 mV, 416 mV maximum voltage were measured from sample I, II and III respectively. It was observed that the MFC with sewage sludge showed the higher values (around 960 mV) of voltages with time whereas 918 mV obtained with organic waste. Precisely comparing cases with varying the organic waste and sewage sludge ratio helps to find the best bioelectricity generation option. Using MFCs can be appeared as the solution of electricity scarcity along the world as an efficient and eco-friendly manner as well as organic solid waste and sewage sludge management.
基金supported by the National Natural Science Foundation of China(Nos.51968072 and 52160023)Xinjiang Science Fund for Distinguished Young Scholars(No.2021D01E15)+1 种基金the Tianshan Yingcai-Youth talent support program of Xinjiang(No.2022TSYCCX0010)the“Youth talent support program”of Xinjiang Normal University(No.XJNUQB2022-24).
文摘Microbial fuel cell(MFC)coupled constructedwetland(CW)is regarded as a promising green technology due to its simultaneous removal performance for the co-occurrence of various contaminants in wastewater.In this study,the simultaneous removal performance of sulfamethazine(SMZ)and hexavalent chromium Cr(VI)in the CW and MFC-CW systems was investigated.The removal efficiencies of total nitrogen(N),total phosphorus(P),and chemical oxygen demand(COD)were also examined.The results demonstrated that Cr(VI)was effectively eliminated with an excellent removal efficiency of>98.0%,followed by SMZ with a removal efficiency of 70.3%-85.6%.Additionally,during the long-term operation period,the average removal efficiency for N,P,and COD ranged from 74.0%to 96.1%,83.6%to 94.1%,and 91.1%to 95.3%,respectively.The microbial community and antibiotic resistance genes(ARGs)in the anode and cathode were also analyzed separately to evaluate the SMZ and Cr(VI)removal performance of MFC-CW.The abundance of corresponding ARGs was slightly different in the anode and cathode regions.The average abundance of sul4 in the SMZ+Cr(VI)treatment MFC-CW was significantly higher than that of other sul1-3.This study offers valuable insights for the simultaneous removal of SMZ and Cr(VI)from wastewater by MFC-CW.
基金Project supported by the National Natural Science Foundation of China(Nos.12072003 and 12372003)Beijing Natural Science Foundation of China(No.1222001)。
文摘Owing to their high flexibility and directional actuation capabilities,macro fiber composites(MFCs)have attracted significant attention for the active control of structures,especially in the nonlinear vibration suppression applications for large-scale flexible structures.In this paper,an MFC-based self-feedback system is introduced for the active control of geometrically nonlinear steady-state forced vibrations in functionally graded carbon nanotube reinforced composite(FG-CNTRC)plates subject to transverse mechanical loads.Based on the first-order shear deformation theory and the von Kármán nonlinear strain-displacement relationship,the nonlinear vibration control equations of the plate with MFC sensor and actuator layers are derived by Hamilton's principle.These equations are discretized by the finite element method(FEM),and solved by the Newton-Raphson and direct iterative methods.A velocity feedback control algorithm is introduced,and the effects of the control gain and the MFC actuator position on the nonlinear vibration active control effectiveness are analyzed.Additionally,a nonlinear resonance analysis is carried out,considering the effects of carbon nanotube(CNT)volume fraction and distribution type.The results indicate that the intrinsic characteristics of the structures significantly influence the vibration behavior.Furthermore,the appropriate selections of control gain and MFC position are crucial for the effective active control of the structures.The present work provides a promising route of the active and efficient nonlinear vibration suppression for various thin-walled structures.
