Electron Transfer Mechanism of Mixed Consortia from Oilfield

摘要

@@1.INTRODUCTION Interest in microbial fuel cells (MFCs) is gaining momentum worldwide with global energy crisis and environment deterioration. There are two types of microbes used in MFC,single strain and mixed consortia. The known electron transfer mechanisms of the single strains involved: extracellular cytochrome,self-secreted electron shuttles or metabolites,and cilia or pili (microbial nanowires).Notwithstanding their high electron transfer rate,single strains often exhibit low growth rate and rigorous selectivity for substrates.Mixed consortia have more advantages,such as strong ability of anti-shock,extensive substrates source,high degradation rate and energy conversion efficiency.Rabaey etc have studied microbial consortia with self-mediating capacity using cyclic voltammetry (CV) to determine the electrochemical activity of bacteria. The aims of this work were to develop an air-cathode microbial fuel cell (ACMFC) using mixed consortia isolated from oilfield soil; to discuss the electrochemical activity and the electron transfer mechanism through electrochemical technique such as,CV and electrochemical impedance spectroscopy (EIS),etc.