5.The risk of the applications of wastes-recycled materials to human health and the environment
Cyclical resources, Waste incineration residues, Recycle, Environmental risk
Slag of municipal solid waste incineration residues has been applied as concrete and asphalt aggregates. In this study, the risk of inhalation intake of slag that contained in abrasion dust from slag asphalt was assessed. The particle size distribution of abrasion dust from slag asphalt was comparable with that of reference asphalt. Composition ratio of slag in abrasion dust was estimated by two methods, which were respectively based on peak intensity of X-ray diffraction and difference of heavy metal contents. Composition ratio of slag in abrasion dust depends on dust size. The slag composition ratio of fine dust less than 75 ¦Ģm was lower than the composition ratio of slag in slag-asphalt material. For medium-sized dust from 150 ¦Ģm to 1 mm, its slag ratio was higher than the slag ratio of slag-asphalt. This means that slag is hardly abraded rather than natural aggregates. The risk of inhalation intake of slag in abrasion dust was assessed to be negligible.
|image”§Fig. The composition ratio of slag in abrasion dust from slag asphalt