Emissions of polycyclic aromatic hydrocarbons (PAHs) from the pyrolysis of scrap tires

Shui Jen Chen, Hung Bin Su, Juu En Chang, Wen Jhy Lee, Kuo Lin Huang, Lien Te Hsieh, Yi Chu Huang, Wen Yinn Lin, Chih Chung Lin

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78 Citations (Scopus)

Abstract

This work investigated the PAHs generated in a waste-tire pyrolysis process and the PAHs removal by a wet scrubber (WSB) and a flare. IND, DBA, and BaP were found to dominate in the powders of scrap tires before the pyrolysis. The PAHs in the carbon blacks formed in the pyrolysis were mainly 2-, 3-, 6-, and 7-ring PAHs. Nap was the most predominant water-phase PAH in the WSB effluent. About 40% of the water-phase total-PAHs in the WSB effluent were contributed by nine carcinogenic PAHs. NaP, IND, and COR displayed higher mean gas- and particulate-phase concentrations than the other PAHs in the flare exhaust. The mean removal efficiencies of individual PAHs, total-PAHs, and high carcinogenic BaP+IND+DBA were 39.1-90.4%, 76.2%, and 84.9%, respectively for the WSB. For the flare, the mean removal efficiencies of gaseous, particulate, and combined (gaseous+particulate) total-PAHs were 59.8%, 91.2%, and 66.8%, respectively, whereas the removal efficiencies were 91.0%, 80.1%, and 89.1%, respectively for the total-BaPeq. However, the gaseous BaA displayed a negative mean removal efficiency. The total PAH emission rate and factor estimated for the scrap tire pyrolysis plant were 42.3 g d-1 and 4.00 mg kg-tire-1, respectively.

Original languageEnglish
Pages (from-to)1209-1220
Number of pages12
JournalAtmospheric Environment
Volume41
Issue number6
DOIs
Publication statusPublished - 2007 Feb

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Atmospheric Science

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