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Removal of COD from a stabilized landfill leachate by physicochemical and advanced oxidative process.

Abstract

This work investigated the effectiveness of a physicochemical and oxidative process for the removal of chemical oxygen demand (COD) from stabilized landfill leachates. The application of these technologies for landfill leachate treatment greatly depends on the optimal operating conditions for a specific leachate. Coagulation-flocculation followed by H2O2, Fenton and photo-Fenton processes was evaluated. Advanced oxidation processes were evaluated in the raw leachate and the leachate pretreated by coagulation-flocculation. Via the coagulation process, at 30 sec and a stirring speed of 150 rpm followed by flocculation and settling steps, 53% COD was removed at an optimal dose of 1400 mg L(-1) and pH 4.0. Moreover, from the POA evaluated, the Fenton process was determined to be the most effective process for removing COD from the leachate pretreated by coagulation-flocculation, reaching 83.3% COD removal with 1330 mg L(-1) of H2O2 and 266 mg L(-1) of Fe(2+). The photo-Fenton process applied directly to the raw effluent was effective for the removal of COD; a 75% reduction in COD was observed in tests using 2720 mg L(-1) of H2O2 and 544 mg L(-1) of Fe(2+). Due to the variability in the composition of the Gramacho landfill leachate, the combination of coagulation-flocculation and the Fenton process is an effective technology for reducing the COD in samples of this leachate.

Authors+Show Affiliations

a School of Chemistry , Federal University of Rio de Janeiro , Rio de Janeiro , Brazil.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

25320859

Citation

Cheibub, Ana F., et al. "Removal of COD From a Stabilized Landfill Leachate By Physicochemical and Advanced Oxidative Process." Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering, vol. 49, no. 14, 2014, pp. 1718-26.
Cheibub AF, Campos JC, da Fonseca FV. Removal of COD from a stabilized landfill leachate by physicochemical and advanced oxidative process. J Environ Sci Health A Tox Hazard Subst Environ Eng. 2014;49(14):1718-26.
Cheibub, A. F., Campos, J. C., & da Fonseca, F. V. (2014). Removal of COD from a stabilized landfill leachate by physicochemical and advanced oxidative process. Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering, 49(14), 1718-26. https://doi.org/10.1080/10934529.2014.951259
Cheibub AF, Campos JC, da Fonseca FV. Removal of COD From a Stabilized Landfill Leachate By Physicochemical and Advanced Oxidative Process. J Environ Sci Health A Tox Hazard Subst Environ Eng. 2014;49(14):1718-26. PubMed PMID: 25320859.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Removal of COD from a stabilized landfill leachate by physicochemical and advanced oxidative process. AU - Cheibub,Ana F, AU - Campos,Juacyara C, AU - da Fonseca,Fabiana V, PY - 2014/10/17/entrez PY - 2014/10/17/pubmed PY - 2015/5/13/medline KW - Fenton reaction KW - Landfill leachate KW - degradation KW - physicochemical process SP - 1718 EP - 26 JF - Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering JO - J Environ Sci Health A Tox Hazard Subst Environ Eng VL - 49 IS - 14 N2 - This work investigated the effectiveness of a physicochemical and oxidative process for the removal of chemical oxygen demand (COD) from stabilized landfill leachates. The application of these technologies for landfill leachate treatment greatly depends on the optimal operating conditions for a specific leachate. Coagulation-flocculation followed by H2O2, Fenton and photo-Fenton processes was evaluated. Advanced oxidation processes were evaluated in the raw leachate and the leachate pretreated by coagulation-flocculation. Via the coagulation process, at 30 sec and a stirring speed of 150 rpm followed by flocculation and settling steps, 53% COD was removed at an optimal dose of 1400 mg L(-1) and pH 4.0. Moreover, from the POA evaluated, the Fenton process was determined to be the most effective process for removing COD from the leachate pretreated by coagulation-flocculation, reaching 83.3% COD removal with 1330 mg L(-1) of H2O2 and 266 mg L(-1) of Fe(2+). The photo-Fenton process applied directly to the raw effluent was effective for the removal of COD; a 75% reduction in COD was observed in tests using 2720 mg L(-1) of H2O2 and 544 mg L(-1) of Fe(2+). Due to the variability in the composition of the Gramacho landfill leachate, the combination of coagulation-flocculation and the Fenton process is an effective technology for reducing the COD in samples of this leachate. SN - 1532-4117 UR - https://www.unboundmedicine.com/medline/citation/25320859/Removal_of_COD_from_a_stabilized_landfill_leachate_by_physicochemical_and_advanced_oxidative_process_ L2 - https://www.tandfonline.com/doi/full/10.1080/10934529.2014.951259 DB - PRIME DP - Unbound Medicine ER -