Tags

Type your tag names separated by a space and hit enter

Evaluation of the biodegradability and toxicity of landfill leachates after pretreatment using advanced oxidative processes.
Waste Manag. 2018 Jun; 76:606-613.WM

Abstract

Leachate from urban solid waste landfills is a complex mixture of organic and inorganic substances that cause damage to the environment, due to the high concentration of recalcitrant organic matter and toxicity. The objective of this study was to apply advanced oxidation processes (AOP), namely the dark Fenton and solar photo-Fenton processes, to young and old landfill leachates prior to biological treatment. The leachates were obtained from the Seropedica and Gramacho landfill sites, respectively, located in Rio de Janeiro State, Brazil. For the two Fenton processes, different conditions of pH (1.5, 3.0 and 5.0) and Fe2+: H2O2 ratio (1:2, 1:5 and 1:10) were evaluated. Biodegradability was evaluated using the Zahn-Wellens methodology and Aliivibrio fischeri acute toxicity tests were conducted in order to predict the toxicity in the activated sludge. The best conditions for both Fenton processes were pH of 3.0 and Fe2+: H2O2 and CODRAW:H2O2 mass ratios of 1:5 and 1:1, respectively. The solar photo-Fenton process was more effective at improving the quality for both leachates, reaching COD, TOC and abs 254 nm reductions of 82%, 85% and 96.3%, respectively, for the Seropedica landfill leachate. In the case of the Gramacho landfill leachate, the corresponding reductions were 78.2, 80.7% and 91.1%, respectively. The biodegradability results for the untreated leachates from the Seropedica and Gramacho sites were 65% and 30% respectively. The biodegradability of both leachates was improved by the Fenton processes, especially the solar photo-Fenton process, which increased the leachate biodegradability to 89% (Seropedica) and 69% (Gramacho). For both leachates, a greater reduction in the acute toxicity was achieved with the solar photo-Fenton compared to the dark-Fenton process. The Seropedica landfill leachate showed high toxicity (EC50 = 33%, 15 min), after the dark Fenton and solar photo Fenton processes, with EC50 values of 81 and 91%, respectively. In the case of Gramacho landfill leachate toxicity, the EC50 value of the raw leachate was 13%, whereas after the dark Fenton and solar photo Fenton processes the corresponding values were 54% and 59%, respectively. These results indicate that the Fenton process (especially solar photo-Fenton), was efficient in terms of increasing the biodegradability and reducing the toxicity of the leachate. This is important in relation to protecting the microbiological community in the activated sludge process.

Authors+Show Affiliations

Castelo Branco University-1631 Santa Cruz Avenue, Realengo, 21710-250 Rio de Janeiro, RJ, Brazil; School of Chemistry, Federal University of Rio de Janeiro, 149 Athos da Silveira Ramos Avenue, room E206, 21941-909 Rio de Janeiro, RJ, Brazil.School of Chemistry, Federal University of Rio de Janeiro, 149 Athos da Silveira Ramos Avenue, room E206, 21941-909 Rio de Janeiro, RJ, Brazil.Department of Sanitary and Environment Engineering, State University of Rio de Janeiro, 524 São Francisco Xavier Street, room 5029-F, 20550-900 Rio de Janeiro, Brazil.School of Chemistry, Federal University of Rio de Janeiro, 149 Athos da Silveira Ramos Avenue, room E206, 21941-909 Rio de Janeiro, RJ, Brazil.School of Chemistry, Federal University of Rio de Janeiro, 149 Athos da Silveira Ramos Avenue, room E206, 21941-909 Rio de Janeiro, RJ, Brazil. Electronic address: juacyara@eq.ufrj.br.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29472151

Citation

da Costa, Fabio Moraes, et al. "Evaluation of the Biodegradability and Toxicity of Landfill Leachates After Pretreatment Using Advanced Oxidative Processes." Waste Management (New York, N.Y.), vol. 76, 2018, pp. 606-613.
da Costa FM, Daflon SDA, Bila DM, et al. Evaluation of the biodegradability and toxicity of landfill leachates after pretreatment using advanced oxidative processes. Waste Manag. 2018;76:606-613.
da Costa, F. M., Daflon, S. D. A., Bila, D. M., da Fonseca, F. V., & Campos, J. C. (2018). Evaluation of the biodegradability and toxicity of landfill leachates after pretreatment using advanced oxidative processes. Waste Management (New York, N.Y.), 76, 606-613. https://doi.org/10.1016/j.wasman.2018.02.030
da Costa FM, et al. Evaluation of the Biodegradability and Toxicity of Landfill Leachates After Pretreatment Using Advanced Oxidative Processes. Waste Manag. 2018;76:606-613. PubMed PMID: 29472151.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Evaluation of the biodegradability and toxicity of landfill leachates after pretreatment using advanced oxidative processes. AU - da Costa,Fabio Moraes, AU - Daflon,Sarah Dario Alves, AU - Bila,Daniele Maia, AU - da Fonseca,Fabiana Valeria, AU - Campos,Juacyara Carbonelli, Y1 - 2018/02/19/ PY - 2017/10/13/received PY - 2018/01/06/revised PY - 2018/02/13/accepted PY - 2018/2/24/pubmed PY - 2018/8/11/medline PY - 2018/2/24/entrez KW - Biodegradability KW - Ecotoxicology KW - Fenton process KW - Leachate KW - Solar radiation SP - 606 EP - 613 JF - Waste management (New York, N.Y.) JO - Waste Manag VL - 76 N2 - Leachate from urban solid waste landfills is a complex mixture of organic and inorganic substances that cause damage to the environment, due to the high concentration of recalcitrant organic matter and toxicity. The objective of this study was to apply advanced oxidation processes (AOP), namely the dark Fenton and solar photo-Fenton processes, to young and old landfill leachates prior to biological treatment. The leachates were obtained from the Seropedica and Gramacho landfill sites, respectively, located in Rio de Janeiro State, Brazil. For the two Fenton processes, different conditions of pH (1.5, 3.0 and 5.0) and Fe2+: H2O2 ratio (1:2, 1:5 and 1:10) were evaluated. Biodegradability was evaluated using the Zahn-Wellens methodology and Aliivibrio fischeri acute toxicity tests were conducted in order to predict the toxicity in the activated sludge. The best conditions for both Fenton processes were pH of 3.0 and Fe2+: H2O2 and CODRAW:H2O2 mass ratios of 1:5 and 1:1, respectively. The solar photo-Fenton process was more effective at improving the quality for both leachates, reaching COD, TOC and abs 254 nm reductions of 82%, 85% and 96.3%, respectively, for the Seropedica landfill leachate. In the case of the Gramacho landfill leachate, the corresponding reductions were 78.2, 80.7% and 91.1%, respectively. The biodegradability results for the untreated leachates from the Seropedica and Gramacho sites were 65% and 30% respectively. The biodegradability of both leachates was improved by the Fenton processes, especially the solar photo-Fenton process, which increased the leachate biodegradability to 89% (Seropedica) and 69% (Gramacho). For both leachates, a greater reduction in the acute toxicity was achieved with the solar photo-Fenton compared to the dark-Fenton process. The Seropedica landfill leachate showed high toxicity (EC50 = 33%, 15 min), after the dark Fenton and solar photo Fenton processes, with EC50 values of 81 and 91%, respectively. In the case of Gramacho landfill leachate toxicity, the EC50 value of the raw leachate was 13%, whereas after the dark Fenton and solar photo Fenton processes the corresponding values were 54% and 59%, respectively. These results indicate that the Fenton process (especially solar photo-Fenton), was efficient in terms of increasing the biodegradability and reducing the toxicity of the leachate. This is important in relation to protecting the microbiological community in the activated sludge process. SN - 1879-2456 UR - https://www.unboundmedicine.com/medline/citation/29472151/Evaluation_of_the_biodegradability_and_toxicity_of_landfill_leachates_after_pretreatment_using_advanced_oxidative_processes_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0956-053X(18)30096-5 DB - PRIME DP - Unbound Medicine ER -