title: Degradation of refractory organics in biotreated landfill leachate using high voltage pulsed discharge combined with TiO2.
abstract: The effect of high voltage pulsed discharge (HVPD) combined with TiO2on the degradation of refractory organic compounds in actual biotreated landfill leachate was investigated. The optimal chemical oxygen demand (COD) removal efficiency could achieve to 58.9% using HVPD+TiO2within 30min at 40kV, 400Hz, and the conductivity of 4.05mscm-1in gas-liquid pulsed discharge. The aromatic compounds decreased by 33.6% compared with HVPD alone according to the UV absorbance at 254nm. Moreover, the fluorescence intensity of humic and fulvic substances was greatly decreased. Active species such as OH radical and H2O2were enhanced in the presence of TiO2, resulting in more high molecular weight organic matter into small molecules or mineralized. In addition, possible degradation pathways was proposed based on acetophenone, which is effective for the degradation of organic matter in biotreated landfill leachate as long as the active species increased.
authors.affiliation: School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Zhang
authors.affiliation: School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China. Electronic address: liujianyong@shu.edu.cn.
authors.forename: Jianyong
authors.initials: J
authors.lastname: Liu
authors.affiliation: School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China.
authors.forename: Xiaojian
authors.initials: X
authors.lastname: Yang
authors.affiliation: Department of Chemistry, Shanghai University, 99 Shangda Road, Shanghai 200444, China. Electronic address: cwm213@staff.shu.edu.cn.
authors.forename: Weimin
authors.initials: W
authors.lastname: Cao
authors.affiliation: School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China.
authors.forename: Guangren
authors.initials: G
authors.lastname: Qian
mesh_terms: D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D004560:Electricity; D006841:Hydrocarbons, Aromatic / Q000032:analysis; D006861:Hydrogen Peroxide; D017665:Hydroxyl Radical; D009930:Organic Chemicals / Q000032:analysis*; D014025:Titanium / Q000494:pharmacology*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D006841:Hydrocarbons, Aromatic; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D017665:Hydroxyl Radical; D006861:Hydrogen Peroxide; D014025:Titanium
keywords: Biotreated landfill leachate; High voltage pulsed discharge; Refractory organics; TiO(2)