Landfill leachate treatment by solar-driven AOPs

Sanitary landfill leachate resulting from the rainwater percolation through the landfill layers and waste material decomposition is a complex mixture of high-strength organic and inorganic compounds which constitutes serious environmental problems. In this study, different heterogeneous (TiO 2/UV, T...

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Veröffentlicht in:	Solar energy 2011-01, Vol.85 (1), p.46-56
Hauptverfasser:	Rocha, Elisangela M.R., Vilar, Vítor J.P., Fonseca, Amélia, Saraiva, Isabel, Boaventura, Rui A.R.
Format:	Artikel
Sprache:	eng
Schlagworte:	ACIDIFICATION Applied sciences AROMATICS CHEMICAL REACTION KINETICS Chemical reactions Chemistry CONSUMPTION RATES Decomposition DOSES EFFICIENCY ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION Exact sciences and technology Fe 2+/H 2O 2/UV General and physical chemistry HYDROGEN PEROXIDE Inorganic chemistry IRON IRON IONS Landfill Landfills LEACHATES Leaching MINERALIZATION Natural water pollution PH VALUE PHOTOCATALYSIS Photochemistry Physical chemistry of induced reactions (with radiations, particles and ultrasonics) Pilot Plant with CPCs Pollution Rainwaters, run off water and others Reaction kinetics REDUCTION Sanitary landfill leachate SANITARY LANDFILLS SOLAR ENERGY Solar-driven AOPs SOLUTIONS TiO 2/H 2O 2/UV Titanium dioxide TITANIUM OXIDES ULTRAVIOLET RADIATION UV/H 2O 2 Waste materials WASTE WATER Water treatment and pollution
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description	Sanitary landfill leachate resulting from the rainwater percolation through the landfill layers and waste material decomposition is a complex mixture of high-strength organic and inorganic compounds which constitutes serious environmental problems. In this study, different heterogeneous (TiO 2/UV, TiO 2/H 2O 2/UV) and homogenous (H 2O 2/UV, Fe 2+/H 2O 2/UV) photocatalytic processes were investigated as an alternative for the treatment of a mature landfill leachate. The addition of H 2O 2 to TiO 2/UV system increased the reduction of the aromatic compounds from 15% to 61%, although mineralization was almost the same. The DOC and aromatic content abatement is similar for the H 2O 2/UV and TiO 2/H 2O 2/UV processes, although the H 2O 2 consumption is three times higher in the H 2O 2/UV system. The low efficiency of TiO 2/H 2O 2/UV system is presumably due to the alkaline leachate solution, for which the H 2O 2 becomes highly unstable and self-decomposition of H 2O 2 occurs. The efficiency of the TiO 2/H 2O 2/UV system increased 10 times after a preliminary pH correction to 4. The photo-Fenton process is much more efficient than heterogeneous (TiO 2, TiO 2/H 2O 2/UV) or homogeneous (H 2O 2/UV) photocatalysis, showing an initial reaction rate more than 20 times higher, and leading to almost complete mineralization of the wastewater. However, when compared with TiO 2/H 2O 2/UV with acidification, the photo-Fenton reaction is only two times faster. The optimal initial iron dose for the photo-Fenton treatment of the leachate is 60 mg Fe 2+ L −1, which is in agreement with path length of 5 cm in the photoreactor. The kinetic behaviour of the process (60 mg Fe 2+ L −1) comprises a slow initial reaction, followed by a first-order kinetics ( k = 0.020 L kJ UV - 1 , r 0 = 12.5 mg kJ UV - 1 ), with H 2O 2 consumption rate of k H2O2 = 3.0 mmol H 2O 2 kJ UV - 1 , and finally, the third reaction period, characterized by a lower DOC degradation and H 2O 2 consumption until the end of the experiment, presumably due to the formation of low-molecular-weight carboxylic groups. A total of 306 mM of H 2O 2 was consumed for achieving 86% mineralization (DOC final = 134 mg L −1) and 94% aromatic content reduction after 110 kJ UV L −1, using an initial iron concentration of 60 mg Fe 2+ L −1.
doi_str_mv	10.1016/j.solener.2010.11.001
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In this study, different heterogeneous (TiO 2/UV, TiO 2/H 2O 2/UV) and homogenous (H 2O 2/UV, Fe 2+/H 2O 2/UV) photocatalytic processes were investigated as an alternative for the treatment of a mature landfill leachate. The addition of H 2O 2 to TiO 2/UV system increased the reduction of the aromatic compounds from 15% to 61%, although mineralization was almost the same. The DOC and aromatic content abatement is similar for the H 2O 2/UV and TiO 2/H 2O 2/UV processes, although the H 2O 2 consumption is three times higher in the H 2O 2/UV system. The low efficiency of TiO 2/H 2O 2/UV system is presumably due to the alkaline leachate solution, for which the H 2O 2 becomes highly unstable and self-decomposition of H 2O 2 occurs. The efficiency of the TiO 2/H 2O 2/UV system increased 10 times after a preliminary pH correction to 4. The photo-Fenton process is much more efficient than heterogeneous (TiO 2, TiO 2/H 2O 2/UV) or homogeneous (H 2O 2/UV) photocatalysis, showing an initial reaction rate more than 20 times higher, and leading to almost complete mineralization of the wastewater. However, when compared with TiO 2/H 2O 2/UV with acidification, the photo-Fenton reaction is only two times faster. The optimal initial iron dose for the photo-Fenton treatment of the leachate is 60 mg Fe 2+ L −1, which is in agreement with path length of 5 cm in the photoreactor. 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In this study, different heterogeneous (TiO 2/UV, TiO 2/H 2O 2/UV) and homogenous (H 2O 2/UV, Fe 2+/H 2O 2/UV) photocatalytic processes were investigated as an alternative for the treatment of a mature landfill leachate. The addition of H 2O 2 to TiO 2/UV system increased the reduction of the aromatic compounds from 15% to 61%, although mineralization was almost the same. The DOC and aromatic content abatement is similar for the H 2O 2/UV and TiO 2/H 2O 2/UV processes, although the H 2O 2 consumption is three times higher in the H 2O 2/UV system. The low efficiency of TiO 2/H 2O 2/UV system is presumably due to the alkaline leachate solution, for which the H 2O 2 becomes highly unstable and self-decomposition of H 2O 2 occurs. The efficiency of the TiO 2/H 2O 2/UV system increased 10 times after a preliminary pH correction to 4. The photo-Fenton process is much more efficient than heterogeneous (TiO 2, TiO 2/H 2O 2/UV) or homogeneous (H 2O 2/UV) photocatalysis, showing an initial reaction rate more than 20 times higher, and leading to almost complete mineralization of the wastewater. However, when compared with TiO 2/H 2O 2/UV with acidification, the photo-Fenton reaction is only two times faster. The optimal initial iron dose for the photo-Fenton treatment of the leachate is 60 mg Fe 2+ L −1, which is in agreement with path length of 5 cm in the photoreactor. The kinetic behaviour of the process (60 mg Fe 2+ L −1) comprises a slow initial reaction, followed by a first-order kinetics ( k = 0.020 L kJ UV - 1 , r 0 = 12.5 mg kJ UV - 1 ), with H 2O 2 consumption rate of k H2O2 = 3.0 mmol H 2O 2 kJ UV - 1 , and finally, the third reaction period, characterized by a lower DOC degradation and H 2O 2 consumption until the end of the experiment, presumably due to the formation of low-molecular-weight carboxylic groups. A total of 306 mM of H 2O 2 was consumed for achieving 86% mineralization (DOC final = 134 mg L −1) and 94% aromatic content reduction after 110 kJ UV L −1, using an initial iron concentration of 60 mg Fe 2+ L −1.</description><subject>ACIDIFICATION</subject><subject>Applied sciences</subject><subject>AROMATICS</subject><subject>CHEMICAL REACTION KINETICS</subject><subject>Chemical reactions</subject><subject>Chemistry</subject><subject>CONSUMPTION RATES</subject><subject>Decomposition</subject><subject>DOSES</subject><subject>EFFICIENCY</subject><subject>ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION</subject><subject>Exact sciences and technology</subject><subject>Fe 2+/H 2O 2/UV</subject><subject>General and physical chemistry</subject><subject>HYDROGEN PEROXIDE</subject><subject>Inorganic chemistry</subject><subject>IRON</subject><subject>IRON IONS</subject><subject>Landfill</subject><subject>Landfills</subject><subject>LEACHATES</subject><subject>Leaching</subject><subject>MINERALIZATION</subject><subject>Natural water pollution</subject><subject>PH VALUE</subject><subject>PHOTOCATALYSIS</subject><subject>Photochemistry</subject><subject>Physical chemistry of induced reactions (with radiations, particles and ultrasonics)</subject><subject>Pilot Plant with CPCs</subject><subject>Pollution</subject><subject>Rainwaters, run off water and others</subject><subject>Reaction kinetics</subject><subject>REDUCTION</subject><subject>Sanitary landfill leachate</subject><subject>SANITARY LANDFILLS</subject><subject>SOLAR ENERGY</subject><subject>Solar-driven AOPs</subject><subject>SOLUTIONS</subject><subject>TiO 2/H 2O 2/UV</subject><subject>Titanium dioxide</subject><subject>TITANIUM OXIDES</subject><subject>ULTRAVIOLET RADIATION</subject><subject>UV/H 2O 2</subject><subject>Waste materials</subject><subject>WASTE WATER</subject><subject>Water treatment and pollution</subject><issn>0038-092X</issn><issn>1471-1257</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><recordid>eNqFkU2LFDEQhhtRcFz9CUKjiHvpsSqdj-6TLIuuwsB6UPAWqtPVbIae9JpkFvbfm2YGDx70FAhPPUm9b1W9RtgioP6w36Zl5sBxK2C9wy0APqk2KA02KJR5Wm0A2q6BXvx8Xr1IaV8Ag53ZVLCjME5-nuuZyd1R5jpHpnzgkOvhsS5mis0Y_QOH-ur2W3pZPZtoTvzqfF5UPz5_-n79pdnd3ny9vto1Tqo-N2oA6JFolLojmCblRC9QihY0kOB-IGJtVCtQD6OiwQjpEKRQcuh7DUN7Ub09eZeUvU3OZ3Z3bgmBXbbFBNgaKNT7E3Ufl19HTtkefHI8zxR4OSbbKSwf0EYX8vKfJBpjUEjsZEHf_IXul2MMZVvbCWFareTqUyfIxSWlyJO9j_5A8dEi2LUWu7fnWuxai0W0JfUy9-4sp-RoniIF59OfYdEaoVSvCvfxxHEJ-cEXS8mAg-PRxzWCcfH_eek38qChwQ</recordid><startdate>20110101</startdate><enddate>20110101</enddate><creator>Rocha, Elisangela M.R.</creator><creator>Vilar, Vítor J.P.</creator><creator>Fonseca, Amélia</creator><creator>Saraiva, Isabel</creator><creator>Boaventura, Rui A.R.</creator><general>Elsevier Ltd</general><general>Elsevier</general><general>Pergamon Press Inc</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7ST</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>KR7</scope><scope>L7M</scope><scope>SOI</scope><scope>7SU</scope><scope>7TG</scope><scope>7U6</scope><scope>KL.</scope><scope>OTOTI</scope></search><sort><creationdate>20110101</creationdate><title>Landfill leachate treatment by solar-driven AOPs</title><author>Rocha, Elisangela M.R. ; 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In this study, different heterogeneous (TiO 2/UV, TiO 2/H 2O 2/UV) and homogenous (H 2O 2/UV, Fe 2+/H 2O 2/UV) photocatalytic processes were investigated as an alternative for the treatment of a mature landfill leachate. The addition of H 2O 2 to TiO 2/UV system increased the reduction of the aromatic compounds from 15% to 61%, although mineralization was almost the same. The DOC and aromatic content abatement is similar for the H 2O 2/UV and TiO 2/H 2O 2/UV processes, although the H 2O 2 consumption is three times higher in the H 2O 2/UV system. The low efficiency of TiO 2/H 2O 2/UV system is presumably due to the alkaline leachate solution, for which the H 2O 2 becomes highly unstable and self-decomposition of H 2O 2 occurs. The efficiency of the TiO 2/H 2O 2/UV system increased 10 times after a preliminary pH correction to 4. The photo-Fenton process is much more efficient than heterogeneous (TiO 2, TiO 2/H 2O 2/UV) or homogeneous (H 2O 2/UV) photocatalysis, showing an initial reaction rate more than 20 times higher, and leading to almost complete mineralization of the wastewater. However, when compared with TiO 2/H 2O 2/UV with acidification, the photo-Fenton reaction is only two times faster. The optimal initial iron dose for the photo-Fenton treatment of the leachate is 60 mg Fe 2+ L −1, which is in agreement with path length of 5 cm in the photoreactor. The kinetic behaviour of the process (60 mg Fe 2+ L −1) comprises a slow initial reaction, followed by a first-order kinetics ( k = 0.020 L kJ UV - 1 , r 0 = 12.5 mg kJ UV - 1 ), with H 2O 2 consumption rate of k H2O2 = 3.0 mmol H 2O 2 kJ UV - 1 , and finally, the third reaction period, characterized by a lower DOC degradation and H 2O 2 consumption until the end of the experiment, presumably due to the formation of low-molecular-weight carboxylic groups. A total of 306 mM of H 2O 2 was consumed for achieving 86% mineralization (DOC final = 134 mg L −1) and 94% aromatic content reduction after 110 kJ UV L −1, using an initial iron concentration of 60 mg Fe 2+ L −1.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.solener.2010.11.001</doi><tpages>11</tpages></addata></record>
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subjects	ACIDIFICATION Applied sciences AROMATICS CHEMICAL REACTION KINETICS Chemical reactions Chemistry CONSUMPTION RATES Decomposition DOSES EFFICIENCY ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION Exact sciences and technology Fe 2+/H 2O 2/UV General and physical chemistry HYDROGEN PEROXIDE Inorganic chemistry IRON IRON IONS Landfill Landfills LEACHATES Leaching MINERALIZATION Natural water pollution PH VALUE PHOTOCATALYSIS Photochemistry Physical chemistry of induced reactions (with radiations, particles and ultrasonics) Pilot Plant with CPCs Pollution Rainwaters, run off water and others Reaction kinetics REDUCTION Sanitary landfill leachate SANITARY LANDFILLS SOLAR ENERGY Solar-driven AOPs SOLUTIONS TiO 2/H 2O 2/UV Titanium dioxide TITANIUM OXIDES ULTRAVIOLET RADIATION UV/H 2O 2 Waste materials WASTE WATER Water treatment and pollution
title	Landfill leachate treatment by solar-driven AOPs
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