Asphalt plants contribute to environmental pollution in many ways. Not only are there dust of particulate emissions from the tower and the aggregate dryer, but there are also blue smoke, odor pollution, and noise pollution. This paper considers the control equipment available for each of these pollutants. Consideration is given to the theory of operation, the applicability of the equipment, and the approximate efficiency ranges. The following types of equipment for dust collection are described: cyclonic separators, wet collectors, electrostatic collectors, and fabric filters. The methods considered for noise control include mechanical methods for noise reduction at the source, limiting a worker's exposure time, and the use of ear muffs. Two methods are described for blue smoke control: (1) installation of a scavenger air system around the pugmill to collect the blue smoke which is piped into an ordinary system for burning or a recently developed environmental type burner system with a recuperative chamber, where it can be oxidized without detrimental effects to the burner; and (2) capturing the blue smoke in a charcoal bed collector. To date the methods of odor control are limited and of doubtful effectiveness. The best solution for odor control appears to be locating the plant away from population centers.

  • Authors:
    • Lundy, J T
  • Publication Date: 1972

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  • Accession Number: 00096452
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 13 1975 12:00AM