关键词: 电辅助微生物, 五氯酚, 细胞色素c, 长程电子传递, 逆向传递

Abstract: Electrochemistry(electro-assisted)was introduced to the microbial reduction of PCP in order to resolve the lack of electron donor and the slow reduction rate.It was found that the PCP degradation efficiency of 97% in the electro-assisted microbial system was higher than the sum of that of 62% in the microbial system and that of 26% in the electrochemical system by about 10%.The cyclic voltammetry(CV)curves of the PCP reduction degradation in the electro-assisted microbial system and in the electrochemical system were compared.There were obvious redox peaks in the cyclic voltammetry curves of the electro-assisted microbial system and the electron transfer rate was 0.856 m穝^-1,the electron transfer coefficient was 2.024 in a two-electron transfer process,which conformed to the biodegradation characteristics.The electron given by the electric field did accelerate the electron transfer during the microbial respiration.There was reverse electronic transfer between the electrodes,cytochrome c,cty穊c1,NAD and pollutants in the electro-assisted microbial system and the long-range electron transfer processes of multiphase interface between the electrode,microorganisms and pollutants were implemented. The study provides a new concept of electrochemical synergy with microbial reduction for environmental pollution control.

Key words: electro-assisted microbial system, PCP, cytochrome c, long-range electron transfer, reverse transfer