Use of advanced oxidation processes to improve the biodegradability of mature landfill leachates.
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.
de Morais
Josmaria Lopes
JL
Grupo de Desenvolvimento de Técnicas Avançadas para Tratamento de Resíduos (TECNOTRATER), Departamento de Química, Universidade Federal do Paraná, 81531-990 Curitiba, Brazil.
Zamora
Patricio Peralta
PP
D001673:Biodegradation, Environmental; D002384:Catalysis; D006861:Hydrogen Peroxide; D010084:Oxidation-Reduction; D010777:Photochemistry / Q000379:methods; D012037:Refuse Disposal / Q000379:methods*; D014466:Ultraviolet Rays
D006861:Hydrogen Peroxide