title: Use of advanced oxidation processes to improve the biodegradability of mature landfill leachates.
abstract: Two advanced oxidative processes (Fe2+/H2O2/UV and H2O2/UV systems) were used for the pre-treatment of mature landfill leachate with the objective of improving its overall biodegradability, evaluated in terms of BOD5/COD ratio, up to a value compatible with biological treatment. At optimized experimental conditions (2000 mgL(-1) of H2O2 and 10 mgL(-1) of Fe2+ for the photo-Fenton system, and 3000 mgL(-1) of H2O2 for the H2O2/UV system), both methods showed suitability for partial removal of chemical oxygen demand (COD), total organic carbon (TOC) and color. The biodegradability was significantly improved (BOD5/COD from 0.13 to 0.37 or 0.42) which allowed an almost total removal of COD and color by a sequential activated sludge process. In addition, gel permeation chromatography (GPC) has showed a substantial agreement on the cleavage of large organic compound into smaller ones.
authors.affiliation: Grupo de Desenvolvimento de Técnicas Avançadas para Tratamento de Resíduos (TECNOTRATER), Departamento de Química, Universidade Federal do Paraná, 81531-990 Curitiba, Brazil.
authors.forename: Josmaria Lopes
authors.initials: JL
authors.lastname: de Morais
authors.forename: Patricio Peralta
authors.initials: PP
authors.lastname: Zamora
mesh_terms: D001673:Biodegradation, Environmental; D002384:Catalysis; D006861:Hydrogen Peroxide; D010084:Oxidation-Reduction; D010777:Photochemistry / Q000379:methods; D012037:Refuse Disposal / Q000379:methods*; D014466:Ultraviolet Rays
chemical_list: D006861:Hydrogen Peroxide