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• W2078162218 abstract "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 (TiO2/UV, TiO2/H2O2/UV) and homogenous (H2O2/UV, Fe2+/H2O2/UV) photocatalytic processes were investigated as an alternative for the treatment of a mature landfill leachate. The addition of H2O2 to TiO2/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 H2O2/UV and TiO2/H2O2/UV processes, although the H2O2 consumption is three times higher in the H2O2/UV system. The low efficiency of TiO2/H2O2/UV system is presumably due to the alkaline leachate solution, for which the H2O2 becomes highly unstable and self-decomposition of H2O2 occurs. The efficiency of the TiO2/H2O2/UV system increased 10 times after a preliminary pH correction to 4. The photo-Fenton process is much more efficient than heterogeneous (TiO2, TiO2/H2O2/UV) or homogeneous (H2O2/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 TiO2/H2O2/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 Fe2+ L−1, which is in agreement with path length of 5 cm in the photoreactor. The kinetic behaviour of the process (60 mg Fe2+ L−1) comprises a slow initial reaction, followed by a first-order kinetics (k = 0.020 LkJUV-1, r0 = 12.5 mg kJUV-1), with H2O2 consumption rate of kH2O2 = 3.0 mmol H2O2 kJUV-1, and finally, the third reaction period, characterized by a lower DOC degradation and H2O2 consumption until the end of the experiment, presumably due to the formation of low-molecular-weight carboxylic groups. A total of 306 mM of H2O2 was consumed for achieving 86% mineralization (DOCfinal = 134 mg L−1) and 94% aromatic content reduction after 110 kJUV L−1, using an initial iron concentration of 60 mg Fe2+ L−1." @default.
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• W2078162218 date "2011-01-01" @default.
• W2078162218 modified "2023-10-17" @default.
• W2078162218 title "Landfill leachate treatment by solar-driven AOPs" @default.
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• W2078162218 doi "https://doi.org/10.1016/j.solener.2010.11.001" @default.
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