title: Characterization of dissolved organic matter in landfill leachate during the combined treatment process of air stripping, Fenton, SBR and coagulation.
abstract: A combined treatment process of air stripping+Fenton+sequencing batch reactor (SBR)+ coagulation was performed to remove the pollutants in landfill leachate. Molecular weight (MW) distribution and fractions of dissolved organic matter (DOM) were discussed to study the characteristics. The experiment showed that the removal rate of chemical oxygen demand (COD), five day biological oxygen demand (BOD5) and ammonia nitrogen (NH3N) by the combined process were 92.8%, 87.8% and 98.0%, respectively. Humic acid (HA) and fulvic acid (FA) were the main fractions in raw leachate with 81.8% of the total COD concentration, while hydrophilic organic matter (HyI) was the dominant fraction in the final effluent of the combined process with 63.5% of the total COD concentration. After the combined treatment process, the removal rate of DOM and fractions HA, FA, HyI were 91.9%, 97.1%, 95.8% and 71.7%, respectively. Organic matters of MW<2k and MW>100k were removed with 90.5% and 97.9% COD concentration after the treatment. The ultraviolet-visible spectra (UV-vis), Fourier transform infrared spectra (FTIR) and three-dimensional excitation-emission matrices spectra (EEMs) indicated that benzene materials and phenol compounds were preferentially removed in air stripping. High MW matters, aromatic rings, conjugated moieties and some functional groups were mainly removed by Fenton. While smallMW fractions, carboxylic acids, alcohols and protein-like materials were preferentially biodegraded via SBR. Fulvic-like and humic-like materials were mainly destroyed via Fenton oxidation and coagulation.
authors.affiliation: Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, People's Republic of China; Faculty of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400020, People's Republic of China. Electronic address: liulqs@163.com.
authors.forename: ZhiPing
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Faculty of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400020, People's Republic of China.
authors.forename: WenHui
authors.initials: W
authors.lastname: Wu
authors.affiliation: Faculty of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400020, People's Republic of China.
authors.forename: Ping
authors.initials: P
authors.lastname: Shi
authors.affiliation: Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400045, People's Republic of China.
authors.forename: JinSong
authors.initials: J
authors.lastname: Guo
authors.affiliation: Faculty of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400020, People's Republic of China.
authors.forename: Jin
authors.initials: J
authors.lastname: Cheng
mesh_terms: D001673:Biodegradation, Environmental; D019149:Bioreactors; D002681:China; D004784:Environmental Monitoring; D006812:Humic Substances / Q000032:analysis; D006861:Hydrogen Peroxide / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D009930:Organic Chemicals / Q000032:analysis* / Q000737:chemistry; D010084:Oxidation-Reduction; D012037:Refuse Disposal; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: C045076:Fenton's reagent; D006812:Humic Substances; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D006861:Hydrogen Peroxide; D007501:Iron
keywords: Combined treatment process; Dissolved organic matter; Fraction; Landfill leachate; Spectra