Trickling filter in a biocathode microbial fuel cell for efficient wastewater treatment and energy production

• 来源期刊: 中国科学:技术科学（英文版）
• 年，卷（期）: 2019,（10）
• 页码范围: 1703-1709
• 页数: 7页
• 语种: 英文

摘要

Aiming to reduce the energy input,oxygen supply by trickling filter was employed in a biocathode microbial fuel cell (MFC) to examine its performance of electricity production and sewage treatment.During batch operation,trickling MFC (TMFC) could start and aerate effectively (DO＞3.60 mg/L).During continuous operation,TMFC produced a maximum current density of 71.8 A/m3 and maximum power density of 26.2 W/m3 under the hydraulic retention time (HRT) of 10 h.By increasing the HRT to 15 h,90.6％ of COD and 99.0％ of ammonia in simulated domestic sewage were efficiently removed and the maximum power density was 19.4 W/m3.Continuous purification of real municipal wastewater achieved 85.9％ of COD removal rate and 91.6％ of ammonia removal rate.Sequencing result of biocathodic microorganisms indicated that it consisted of four major classes and the dominant class was γ-proteobacteria,which accounted for up to 84.38％.The dominant genus was Acinetobacter,which accounted for 57.81％.The phylogenetic tree showed different relationships among the 19 species ofbiocathode microorganisms and the predominant species was Acinetobacter calcoaceticus.