Determination of Emission Characteristics during Thermal Treatment of Lube Oil and Heavy Metal Co-Contaminated Soil by Fluidized Bed Combustion
Publication: Journal of Environmental Engineering
Volume 141, Issue 10
Abstract
This paper aims to investigate the emission characteristics during the thermal treatment of co-contaminated soils containing lube oil and heavy metals (Cd, Cr, Cu, and Pb). Experiments were conducted using a laboratory-scale bubbling fluidized bed combustor under various fluidization parameters including temperature (500–800°C), air velocity (), and sand bed particle size (545–920 μm). The emission products from the system, including flue gas, fly ash, and bottom ash, were sampled, and the concentrations of heavy metals and organic pollutants (such as benzene, toluene, ethylbenzene, xylene, and polycyclic aromatic hydrocarbons) along with the metal leachability were determined. The average emissions were lowest at 800°C, air velocities were in the range of , and sand bed particle diameters were 770–920 μm. Removal of more than 99% and 48–85% of lube oil and heavy metals, respectively, was observed. Portions of the heavy metals were vaporized and attached to the fly ash, while the residual heavy metal fractions in bottom ash were supposed the effect of particle aggregated during thermal treatment. The experimental results showed that all heavy metals were concentrated in the bottom ash due to particle agglomeration; therefore, the metals leachability was in accordance with the standards.
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Acknowledgments
The financial support of the Taiwan National Science Council NSC-101-2221-E-033-081 is gratefully acknowledged.
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Journal of Environmental Engineering
Volume 141 • Issue 10 • October 2015
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© 2015 American Society of Civil Engineers.
History
Received: Jun 12, 2014
Accepted: Jan 21, 2015
Published online: Mar 20, 2015
Discussion open until: Aug 20, 2015
Published in print: Oct 1, 2015
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