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Oxidation Kinetics of the Combustible Fraction of Construction and Demolition Wastes

^a Dep. of Environmental Engineering, National Cheng Kung Univ., Tainan, Taiwan, Republic of China
^b Dep. of Chemical Engineering, Wu-feng Institute of Technology, Chia-yi, Taiwan, Republic of China

View larger version (36K): [in a new window]   Fig. 1. Thermal gravimetric analysis (TGA) curves of (a) weight change (%) and (b) derivative weight (% K-1) for the oxidation of the combustible fraction of construction and demolition wastes (CCDW) (), wood (), and polyurethane (PU) () based on a heating rate of 10 K min-1.

View larger version (32K): [in a new window]   Fig. 2. Comparison of residual weight (%) with respect to different heating rates for the oxidation of the combustible fraction of construction and demolition wastes (CCDW) (2 K min-1 [], 6 K min-1 [], 10 K min-1 []).

View larger version (30K): [in a new window]   Fig. 3. Comparison of derivative weight (% K-1) with respect to different heating rates for the oxidation of the combustible fraction of construction and demolition wastes (CCDW) (2 K min-1 [], 6 K min-1 [], 10 K min-1 []).

View larger version (29K): [in a new window]   Fig. 4. Thermal gravimetric analysis (TGA) curves of the combustible fraction of construction and demolition wastes (CCDW) for illustrating the effect of different oxygen concentrations of 21% (), 15% (), and 10% () based on a heating rate of 10 K min-1.

View larger version (18K): [in a new window]   Fig. 5. Products in the flue gas identified by infrared spectra at (a) 900 K, (b) 700 K, (c) 500 K, and (d) 400 K (VC, vinylchloride; CO, carbon monoxide; CO2, carbon dioxide; H2O, water; resolution = 4 cm-1).

View larger version (83K): [in a new window]   Fig. 6. (a) X-ray powder diffraction (XRD) pattern and (b) scanning electron microscopy (SEM) micrograph of the incineration ash produced at 900 K (C, CaO; K, K2O; Q, quartz; U, CuO; Z, ZnO).

View larger version (43K): [in a new window]   Fig. 7. Mass and energy balance of the conceptual combustible fractions of construction and demolition waste (CCDW) incineration system.