Performance of low temperature Microbial Fuel Cells (MFCs)catalyzed by mixed bacterial consortia

• 作 者: Olga Tkach Thangavel Sangeetha
• 机 构: State Key Laboratory of Urban Water Resources and Environment(SKLUWRE), Harbin Institute of Technolo
• 出 处: 环境科学学报（英文版）
• 发表日期: 2017年2期
• 关键词: Microbial fuel cell Psychrophilic bacteria Shewanella Low temperature Bioelectro

Microbial Fuel Cells (MFCs) are a promising technology for treating wastewater in a sustainable manner.In potential applications,low temperatures substantially reduce MFC performance.To better understand the effect of temperature and particularly how bioanodes respond to changes in temperature,we investigated the current generation of mixed-culture and pure-culture MFCs at two low temperatures,10℃ and 5℃.The results implied that the mixed-culture MFC sustainably performed better than the pure-culture (Shetwanella) MFC at 10℃,but the electrogenic activity of anodic bacteria was substantially reduced at the lower temperature of 5℃.At 10℃,the maximum output voltage generated with the mixed-culture was 540-560 mV,which was 10％-15％ higher than that of Shewanella MFCs.The maximum power density reached 465.3 ± 5.8 mW/m2 for the mixed-culture at 10℃,while only 68.7 ± 3.7 mW/m2 was achieved with the pure-culture.It was shown that the anodic biofilm of the mixed-culture MFC had a lower overpotential and resistance than the pure-culture MFC.Phylogenetic analysis disclosed the prevalence of Geobacter and Pseudomonas rather than Shewanella in the mixed-culture anodic biofilm,which mitigated the increase of resistance or overpotential at low temperatures.