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
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.
