title: Bio-cathode materials evaluation and configuration optimization for power output of vertical subsurface flow constructed wetland - microbial fuel cell systems.
abstract: To optimize the performance of a vertical subsurface flow constructed wetland-microbial fuel cell (CW-MFC), studies of bio-cathode materials and reactor configurations were carried out. Three commonly used bio-cathode materials including stainless steel mesh (SSM), carbon cloth (CC) and granular activated carbon (GAC) were compared and evaluated. GAC-SSM bio-cathode achieved the highest maximum power density of 55.05 mWm(-2), and it was most suitable for CW-MFCs application because of its large surface area and helpful capillary water absorption. Two types of CW-MFCs with roots were constructed, one was placed in the anode and the other was placed in the cathode. Both planted CW-MFCs obtained higher power output than non-planted CW-MFC. Periodic voltage fluctuations of planted CW-MFCs were caused by light/dark cycles, and the influent substrate concentration significantly affected the amplitude of oscillation. The coulombic efficiencies of CW-MFCs decreased greatly with the increase of the influent substrate concentration.
authors: School of Energy and Environment, Southeast University, Nanjing 210096, China.
authors: Shentan
authors: S
authors: Liu
authors: School of Energy and Environment, Southeast University, Nanjing 210096, China.
authors: Hailiang
authors: H
authors: Song
authors: School of Energy and Environment, Southeast University, Nanjing 210096, China.
authors: Size
authors: S
authors: Wei
authors: School of Public Health, Central South University, Changsha 410078, China.
authors: Fei
authors: F
authors: Yang
authors: School of Energy and Environment, Southeast University, Nanjing 210096, China. Electronic address: lxn@seu.edu.cn.
authors: Xianning
authors: X
authors: Li
mesh_terms: D001421:Bacteria, Anaerobic / Q000378:metabolism*; D001674:Bioelectric Energy Sources; D019149:Bioreactors; D003246:Conservation of Energy Resources / Q000379:methods*; D004566:Electrodes; D007700:Kinetics; D010084:Oxidation-Reduction; D053833:Wetlands
keywords: Constructed wetland; Microbial fuel cell; Power density; Rhizosphere effect; Wastewater treatment