Extended Evaluation of Unpaved Road Dust Suppressants in the Iron and Steel Industry

摘要

The report gives results of a study to measure the long-term control effectiveness of various dust suppressants used to mitigate particulate emissions from vehicular traffic on unpaved roads in the iron and steel industry. Control effectiveness was determined by measuring emissions, using an exposure profiling technique, before and after control application. Control effectiveness was determined for total particulate (TP) and for three particle size (aerodynamic diameter) fractions. Parameters affecting the cost-effectiveness of unpaved road dust suppressants were also quantified, and the trace element composition of uncontrolled unpaved road surface material and airborne dust emissions was examined. The three dust suppressants evaluated were: a 20% solution of Petro Tac (an emulsified asphalt), water, and a 20% solution of Coherex (a petroleum resin) followed by a repeat application of 12% solution 44 days later.