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Insights into solar photo-Fenton reaction parameters in the oxidation of a sanitary landfill leachate at lab-scale.
J Environ Manage. 2015 Dec 01; 164:32-40.JE

Abstract

This work evaluates the effect of the main photo-Fenton (PF) reaction variables on the treatment of a sanitary landfill leachate collected at the outlet of a leachate treatment plant, which includes aerated lagooning followed by aerated activated sludge and a final coagulation-flocculation step. The PF experiments were performed in a lab-scale compound parabolic collector (CPC) photoreactor using artificial solar radiation. The photocatalytic reaction rate was determined while varying the total dissolved iron concentration (20-100 mg Fe(2+)/L), solution pH (2.0-3.6), operating temperature (10-50 °C), type of acid used for acidification (H2SO4, HCl and H2SO4 + HCl) and UV irradiance (22-68 W/m(2)). This work also tries to elucidate the role of ferric hydroxides, ferric sulphate and ferric chloride species, by taking advantage of ferric speciation diagrams, in the efficiency of the PF reaction when applied to leachate oxidation. The molar fraction of the most photoactive ferric species, FeOH(2+), was linearly correlated with the PF pseudo-first order kinetic constants obtained at different solution pH and temperature values. Ferric ion speciation diagrams also showed that the presence of high amounts of chloride ions negatively affected the PF reaction, due to the decrease of ferric ions solubility and scavenging of hydroxyl radicals for chlorine radical formation. The increment of the PF reaction rates with temperature was mainly associated with the increase of the molar fraction of FeOH(2+). The optimal parameters for the photo-Fenton reaction were: pH = 2.8 (acidification agent: H2SO4); T = 30 °C; [Fe(2+)] = 60 mg/L and UV irradiance = 44 WUV/m(2), achieving 72% mineralization after 25 kJUV/L of accumulated UV energy and 149 mM of H2O2 consumed.

Authors+Show Affiliations

LSRE - Laboratory of Separation and Reaction Engineering - Associate Laboratory LSRE/LCM, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal. Electronic address: tania.silva@fe.up.pt.LSRE - Laboratory of Separation and Reaction Engineering - Associate Laboratory LSRE/LCM, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.LSRE - Laboratory of Separation and Reaction Engineering - Associate Laboratory LSRE/LCM, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.LSRE - Laboratory of Separation and Reaction Engineering - Associate Laboratory LSRE/LCM, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal; Programa de Pós-Graduação em Engenharia Química da Universidade Estadual de Maringá, Av. Colombo 5790, Maringá-PR, Brazil.Efacec Engenharia e Sistemas S.A. (Unidade de Negócios Ambiente), SA, Rua Eng. Frederico Ulrich - Guardeiras, Apartado 3003, 4471-907 Moreira da Maia, Portugal.Efacec Engenharia e Sistemas S.A. (Unidade de Negócios Ambiente), SA, Rua Eng. Frederico Ulrich - Guardeiras, Apartado 3003, 4471-907 Moreira da Maia, Portugal.LSRE - Laboratory of Separation and Reaction Engineering - Associate Laboratory LSRE/LCM, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.LSRE - Laboratory of Separation and Reaction Engineering - Associate Laboratory LSRE/LCM, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal. Electronic address: vilar@fe.up.pt.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26342264

Citation

Silva, Tânia F C V., et al. "Insights Into Solar photo-Fenton Reaction Parameters in the Oxidation of a Sanitary Landfill Leachate at Lab-scale." Journal of Environmental Management, vol. 164, 2015, pp. 32-40.
Silva TF, Ferreira R, Soares PA, et al. Insights into solar photo-Fenton reaction parameters in the oxidation of a sanitary landfill leachate at lab-scale. J Environ Manage. 2015;164:32-40.
Silva, T. F., Ferreira, R., Soares, P. A., Manenti, D. R., Fonseca, A., Saraiva, I., Boaventura, R. A., & Vilar, V. J. (2015). Insights into solar photo-Fenton reaction parameters in the oxidation of a sanitary landfill leachate at lab-scale. Journal of Environmental Management, 164, 32-40. https://doi.org/10.1016/j.jenvman.2015.08.030
Silva TF, et al. Insights Into Solar photo-Fenton Reaction Parameters in the Oxidation of a Sanitary Landfill Leachate at Lab-scale. J Environ Manage. 2015 Dec 1;164:32-40. PubMed PMID: 26342264.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Insights into solar photo-Fenton reaction parameters in the oxidation of a sanitary landfill leachate at lab-scale. AU - Silva,Tânia F C V, AU - Ferreira,Rui, AU - Soares,Petrick A, AU - Manenti,Diego R, AU - Fonseca,Amélia, AU - Saraiva,Isabel, AU - Boaventura,Rui A R, AU - Vilar,Vítor J P, Y1 - 2015/09/03/ PY - 2015/05/21/received PY - 2015/08/17/revised PY - 2015/08/21/accepted PY - 2015/9/7/entrez PY - 2015/9/8/pubmed PY - 2016/6/1/medline KW - Ferric ion speciation diagrams KW - Lab-scale prototype KW - Photo-Fenton parameters KW - Sanitary landfill leachate SP - 32 EP - 40 JF - Journal of environmental management JO - J Environ Manage VL - 164 N2 - This work evaluates the effect of the main photo-Fenton (PF) reaction variables on the treatment of a sanitary landfill leachate collected at the outlet of a leachate treatment plant, which includes aerated lagooning followed by aerated activated sludge and a final coagulation-flocculation step. The PF experiments were performed in a lab-scale compound parabolic collector (CPC) photoreactor using artificial solar radiation. The photocatalytic reaction rate was determined while varying the total dissolved iron concentration (20-100 mg Fe(2+)/L), solution pH (2.0-3.6), operating temperature (10-50 °C), type of acid used for acidification (H2SO4, HCl and H2SO4 + HCl) and UV irradiance (22-68 W/m(2)). This work also tries to elucidate the role of ferric hydroxides, ferric sulphate and ferric chloride species, by taking advantage of ferric speciation diagrams, in the efficiency of the PF reaction when applied to leachate oxidation. The molar fraction of the most photoactive ferric species, FeOH(2+), was linearly correlated with the PF pseudo-first order kinetic constants obtained at different solution pH and temperature values. Ferric ion speciation diagrams also showed that the presence of high amounts of chloride ions negatively affected the PF reaction, due to the decrease of ferric ions solubility and scavenging of hydroxyl radicals for chlorine radical formation. The increment of the PF reaction rates with temperature was mainly associated with the increase of the molar fraction of FeOH(2+). The optimal parameters for the photo-Fenton reaction were: pH = 2.8 (acidification agent: H2SO4); T = 30 °C; [Fe(2+)] = 60 mg/L and UV irradiance = 44 WUV/m(2), achieving 72% mineralization after 25 kJUV/L of accumulated UV energy and 149 mM of H2O2 consumed. SN - 1095-8630 UR - https://www.unboundmedicine.com/medline/citation/26342264/Insights_into_solar_photo_Fenton_reaction_parameters_in_the_oxidation_of_a_sanitary_landfill_leachate_at_lab_scale_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0301-4797(15)30234-6 DB - PRIME DP - Unbound Medicine ER -