title: Performance and microbial community of a membrane bioreactor system - Treating wastewater from ethanol fermentation of food waste.
abstract: In this study, a lab-scale biological anaerobic/anaerobic/anoxic/membrane bioreactor (A3-MBR) was designed to treat wastewater from the ethanol fermentation of food waste, a promising way for the disposal of food waste and reclamation of resources. The 454 pyrosequencing technique was used to investigate the composition of the microbial community in the treatment system. The system yielded a stable effluent concentration of chemical oxygen demand (202±23mg/L), total nitrogen (62.1±7.1mg/L), ammonia (0.3±0.13mg/L) and total phosphorus (8.3±0.9mg/L), and the reactors played different roles in specific pollutant removal. The exploration of the microbial community in the system revealed that: (1) the microbial diversity of anaerobic reactors A1and A2, in which organic pollutants were massively degraded, was much higher than that in anoxic A3and aerobic MBR; (2) although the community composition in each reactor was quite different, bacteria assigned to the classes Clostridia, Bacteroidia, and Synergistia were important and common microorganisms for organic pollutant degradation in the anaerobic units, and bacteria from Alphaproteobacteria and Betaproteobacteria were the dominant microbial population in A3and MBR; (3) the taxon identification indicated that Arcobacter in the anaerobic reactors and Thauera in the anoxic reactor were two representative genera in the biological process. Our results proved that the biological A3-MBR process is an alternative technique for treating wastewater from food waste.
authors.affiliation: Beijing University of Chemical Technology, College of Chemical Engineering, Beijing 100029, China. Electronic address: zhuxiaobiao@mail.buct.edu.cn.
authors.forename: Xiaobiao
authors.initials: X
authors.lastname: Zhu
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Mengqi
authors.initials: M
authors.lastname: Li
authors.affiliation: Key Laboratory of Water Science and Technology of Zhejiang Province, Jiaxing 314006, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zheng
authors.affiliation: Key Laboratory of Water Science and Technology of Zhejiang Province, Jiaxing 314006, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Liu
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China; Key Laboratory of Water Science and Technology of Zhejiang Province, Jiaxing 314006, China. Electronic address: chenlj@mail.tsinghua.edu.cn.
authors.forename: Lujun
authors.initials: L
authors.lastname: Chen
mesh_terms: D019149:Bioreactors / Q000382:microbiology*; D000431:Ethanol; D005285:Fermentation; D005374:Filtration / Q000379:methods; D005735:Garbage; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry
chemical_list: D000431:Ethanol; D062065:Wastewater
keywords: Bacterial diversity; Food waste; MBR; Microbial composition