151Alternative Processing Options
re-rening). Although some road oiling is still common in many areas of the world,
its popularity has declined in recent years because of reductions in the proportion
of unpaved roadways, problems due to contaminants in used oils (such as PCBs,
polychlorinated dibenzodioxins [PCDDs], polychlorinated dibenzofurans [PCDFs]),
competition from other used oil end uses (re-rening), availability of alternative dust
suppression substitutes (calcium chloride and surfactants), and precluding environ-
mental regulations. In fact, studies suggest that the potential effects generated by
road oiling on health and the environment are severe enough to discourage or pro-
hibit such practice. Road oiling with contaminated oil ...