Asphalt Batch & Drum Mix Plants
Asphaltic concrete plants are significant sources of particulate, combustion, and trace organic emissions. These emissions usually include NOx, CO, SOx, TOG, ROG, TSP, PM10, arsenic, beryllium, cadmium, chromium, hexavalent chromium, lead, manganese, mercury, nickel, zinc, benzene, formaldehyde, toluene, Xylenes, and various polycyclic aromatic hydrocarbons (PAH's). Asphalt production consists of several interrelated processes including aggregate storage areas, conveyors, aggregate transfer points, a rotary aggregate dryer, weigh hoppers, asphaltic cement (oil) heating & storage, screens, pugmills, product storage silos, drop zones, and haul roads. The dryer, weigh hoppers, pugmill, and asphalt storage silos are typically vented to a common baghouse.