Electrochemical Responses and Microbial Community Shift of Electroactive Biofilm to Acidity Stress in Microbial Fuel Cells

Microbial community changes in response to acid stress microbial fuel cells (MFCs) were studied. Acid mine drainage (AMD) wastewater is usually difficult treat because of the high concentration sulfate and heavy metals. MFCs, which have multiple functions based on principle synergistically treating organic metal while generating electrical energy, represent a promising direction for development new treatment technologies. Maintaining neutral or slightly alkaline pH MFCs facilitates growth electricity-producing microorganisms anode chamber. Studies electroactive biofilms acidic its correlation with AMD capacity not been reported. Results showed that anolyte 4.0 5.0 affected electron output electrogenic MFCs. In contrast, working at an 6.0 exhibited efficiency chemical energy conversion energy. The abundance diversity biofilm significantly by H+ medium when ambient acidity was continuously reduced. classic exoelectrogen Geobacter decreased gradually increase medium. addition, Cu2+ recovered from simulated cathodic chambers low pH, but removal rate as environment decreased. At 48 h, 86.2% removed cathode solution 5.0, 84.2%. Trace amounts Cu2O Cu3(OH)2[CO3]2 present cathode, reduced amount precipitated carbon cloth. Conversely, catholyte rapidly, 36 no detectable solution. This study will provide researchers valuable information regarding optimal resource recovery