Chapter Five

Pollution Mechanism of Contaminated Construction and Demolition Waste

Abstract

Absorption of single pollutants on the contaminated construction and demolition waste fits the first-order kinetics model whereas that of mixed metals fits the pseudo–second-order kinetic model, with adsorption and reaction rate of Pb and Cr are the highest. Heavy metal is gathered and fixed within 0–1 cm under the surface of waste by hydroxide precipitation, adsorption, and isomorphous replacement. Under multiple contamination, the heavy metals will penetrate much deeper while Cr can be detected around 3–4 cm under the surface, and Cd has the lowest migration capacity on the surface. The porosity of different construction materials can be ordered as brick ...

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