title: Coupling ARB-based biological and photochemical (UV/TiO2and UV/S2O82-) techniques to deal with sanitary landfill leachate.
abstract: The aim of this study was to provide an alternative way to remove bio-refractory organics and ammonical-nitrogen from mature municipal solid waste (MSW) landfill leachate by combining biological and photochemical processes. To achieve this objective, the effectiveness of anoxic aged refuse-based bioreactor (ARB) for biological leachate pretreatment followed by Advanced Oxidation Processes (AOPs) by heterogeneous photocatalysis (TiO2/UV) and persulfate (S2O82-) oxidation were tested. The results obtained after ARB based pre-treatment demonstrated a mean 72%, 81% and 92% degradation of COD, NH4N and TN, respectively. However, this treated leachate cannot be discharged without another treatment; hence, it was further treated by UV-mediated TiO2photocatalysis and S2O82-oxidation. An average 82% of COD was abated at optimum condition (1gL-1TiO2; pH 5) whereas, using an optimum 1.5gL-1persulfate at pH 5, 81% COD reduction occurred. Acidic and alkaline pH favored COD and NH4N removal respectively. The results of this study demonstrated that coupling ARB with AOPs is potentially applicable process to deal with bio-recalcitrant compounds present in mature landfill leachate.
authors.affiliation: Shanghai Key Laboratory for Urban Ecological Process and Eco-Restoration, School of Ecology & Environmental Science, East China Normal University, Shanghai 200241, PR China.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Hassan
authors.affiliation: Shanghai Key Laboratory for Urban Ecological Process and Eco-Restoration, School of Ecology & Environmental Science, East China Normal University, Shanghai 200241, PR China.
authors.forename: Xiaoyuan
authors.initials: X
authors.lastname: Wang
authors.affiliation: Shanghai Key Laboratory for Urban Ecological Process and Eco-Restoration, School of Ecology & Environmental Science, East China Normal University, Shanghai 200241, PR China.
authors.forename: Fei
authors.initials: F
authors.lastname: Wang
authors.affiliation: Shanghai Key Laboratory for Urban Ecological Process and Eco-Restoration, School of Ecology & Environmental Science, East China Normal University, Shanghai 200241, PR China.
authors.forename: Dong
authors.initials: D
authors.lastname: Wu
authors.affiliation: School of Environmental Science and Engineering, Donghua University, Shanghai 200051, PR China.
authors.forename: Asif
authors.initials: A
authors.lastname: Hussain
authors.affiliation: Shanghai Key Laboratory for Urban Ecological Process and Eco-Restoration, School of Ecology & Environmental Science, East China Normal University, Shanghai 200241, PR China. Electronic address: bxie@des.ecnu.edu.cn.
authors.forename: Bing
authors.initials: B
authors.lastname: Xie
mesh_terms: D001673:Biodegradation, Environmental; D006863:Hydrogen-Ion Concentration; D010084:Oxidation-Reduction; D014025:Titanium / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D014025:Titanium
keywords: Aged refuse-based bioreactor (ARB); Persulfate oxidation; Radicals; Sanitary landfill leachate; TiO(2) photocatalysis