title: Applying fermentation liquid of food waste as carbon source to a pilot-scale anoxic/oxic-membrane bioreactor for enhancing nitrogen removal: Microbial communities and membrane fouling behaviour.
abstract: Fermentation liquid of food waste (FLFW) was applied as an external carbon source in a pilot-scale anoxic/oxic-membrane bioreactor (A/O-MBR) system to enhance nitrogen removal for treating low COD/TN ratio domestic wastewater. Results showed that, with the FLFW addition, total nitrogen removal increased from lower than 20% to 44-67% during the 150days of operation. The bacterial metabolic activities were obviously enhanced, and the significant change in microbial community structure promoted pollutants removal and favored membrane fouling mitigation. By monitoring transmembrane pressure and characterizing typical membrane foulants, such as extracellular polymeric substances (EPS), dissolved organic matter (DOM), and inorganics and biopolymers in the cake layer, it was confirmed that FLFW addition did not bring about any additional accumulation of membrane foulants, acceleration of fouling rate, or obvious irreversible membrane fouling in the whole operation period. Therefore, FLFW is a promising alternative carbon source to enhance nitrogen removal for the A/O-MBR system.
authors.affiliation: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; International Science & Technology Cooperation Center for Urban Alternative Water Resources Development, Xi'an 710055, China.
authors.forename: Jialing
authors.initials: J
authors.lastname: Tang
authors.affiliation: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; International Science & Technology Cooperation Center for Urban Alternative Water Resources Development, Xi'an 710055, China; Engineering Technology Research Center for Wastewater Treatment and Reuse, Shaanxi Province, China. Electronic address: xcwang@xauat.edu.cn.
authors.forename: Xiaochang C
authors.initials: XC
authors.lastname: Wang
authors.affiliation: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; International Science & Technology Cooperation Center for Urban Alternative Water Resources Development, Xi'an 710055, China.
authors.forename: Yisong
authors.initials: Y
authors.lastname: Hu
authors.affiliation: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia.
authors.forename: Huu Hao
authors.initials: HH
authors.lastname: Ngo
authors.affiliation: Department of Civil and Environmental Engineering, Tohoku University, Sendai 9808579, Japan.
authors.forename: Yuyou
authors.initials: Y
authors.lastname: Li
authors.affiliation: International Science & Technology Cooperation Center for Urban Alternative Water Resources Development, Xi'an 710055, China; Engineering Technology Research Center for Wastewater Treatment and Reuse, Shaanxi Province, China.
authors.forename: Yongmei
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D019149:Bioreactors; D002244:Carbon; D058440:Denitrification; D005285:Fermentation; D008567:Membranes, Artificial; D009584:Nitrogen / Q000737:chemistry*; D014865:Waste Disposal, Fluid
chemical_list: D008567:Membranes, Artificial; D002244:Carbon; D009584:Nitrogen
keywords: A/O-MBR; Fermentation liquid of food waste (FLFW); Membrane fouling; Microbial community; Nitrogen removal