Determination of Emission Characteristics during Thermal Treatment of Lube Oil and Heavy Metal Co-Contaminated Soil by Fluidized Bed Combustion

Abstract

AbstractThis 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 (11.5–17.9 cm/s), 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 13.7–17.9 cm/s, 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 as...