Photocatalytic Treatment of Landfill Leachate Using W-Doped Nanoparticles
Publication: Journal of Environmental Engineering
Volume 143, Issue 9
Abstract
Leachate is a highly toxic wastewater produced in landfills that causes many environmental problems. One imperative action related to leachate management is the implementation of a leachate collection system and leachate treatment. Because leachate contains a wide range of contaminants, an interesting method that may be used in the future for the treatment of leachate is a photocatalytic treatment process using doped nanoparticles. In this study, the performance of tungsten-doped (W-doped ) nanoparticles in the photocatalytic treatment of landfill leachate under the fluorescent light irradiation was examined. For this purpose, four influential parameters on the photocatalytic process using doped nanoparticles (i.e., dopant content, calcination temperature, pH, and contact time of leachate with nanoparticles) were first experimentally investigated. Next, a quadratic regression equation using response surface methodology was used to predict the concentration of the leachate chemical oxygen demand (COD) in the aforementioned process. To ensure the validity of the model, eight basic assumptions of regression equations were investigated and attempted to be met. Using the model, the effect of each parameter on the photocatalytic treatment process was observed, and leachate COD concentration may be predicted with . Finally, optimal conditions were determined using the model to achieve maximum COD removal efficiency. The confirmatory experiment results show that 46% COD removal efficiency is achievable at optimal conditions (i.e., pH of 6.63, tungsten content of 2.64% by weight, calcination temperature of 472°C, and contact time of 34 h).
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Published In
Journal of Environmental Engineering
Volume 143 • Issue 9 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Oct 14, 2016
Accepted: Feb 8, 2017
Published online: May 12, 2017
Published in print: Sep 1, 2017
Discussion open until: Oct 12, 2017
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