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Asphalt roofing plants
The manufacture
of asphalt paper and shingles consists of impregnating felt with
preheated asphalt. The impregnation is accomplished by continuously
saturating a sheet of felt paper in an asphalt bath heated to
200 to 260ºC. The saturation
fumes are sucked out by an exhaust fan and expelled into the
atmosphere. These fumes can be divided into two (2) categories:
- Gaseous and condensable organic compounds, in the
form of a fine tar mist, produced by the felt saturation process,
including small amounts of polycyclic aromatic compounds;
- Gaseous and particulate compounds produced
by the drying of organic products used in manufacturing.
The main source of air pollution comes from a cloud of white
fumes resulting from the evaporation and subsequent condensation
of the COCs from the asphalt. Since 1992, Biothermica has been
supplying the patented BIOTOX® process adapted for the
treatment of asphalt paper and asphalt shingle fumes. It is
recognized as a world leader in this particular application.
Improvements made to the basic technology consist primarily
in a fume recirculation system and an innovative control philosophy. |
