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Decreasing polycyclic aromatic hydrocarbons emission from bitumen using alternative bitumen production process
In 1988, the NIOSH (National Institute for Occupational Safety and Health) recommended that bitumen fumes should also be considered a potential occupational carcinogen and management practices such as engineering controls should be implemented. Changing the production process of bitumen, as a source control method, was investigated in the study. For the first time, a novel alternative process was used to produce paving grade bitumen with decreased PAH (polycyclic aromatic hydrocarbon) emissions as well as improved bitumen PG (performance grade). Post-consumer latex and NB (natural bitumen) were used as additives to obtain 60/70 modified bitumen directly from the VB (vacuum bottom) without any need for air-blowing. The emissions were produced by a laboratory fume generation rig and were sampled and analyzed by GC-Mass (gas chromatography mass spectrometry) and GC-FID as described in NIOSH method 5515. The PG of the resulting modified 60/70 bitumen in this study covers a wider range of climatic conditions and has higher total resistance against deformation than conventional 60/70 bitumen. The total PAH emissions from modified 60/70 bitumen (100.2619 ng/g) were decreased approximately to 50% of PAHs emitted from conventional 60/70 bitumen (197.696 ng/g). Therefore, it is possible to obtain modified bitumen with lower PAH emissions and better quality than conventional bitumen via additives and without air-blowing.
Decreasing polycyclic aromatic hydrocarbons emission from bitumen using alternative bitumen production process
In 1988, the NIOSH (National Institute for Occupational Safety and Health) recommended that bitumen fumes should also be considered a potential occupational carcinogen and management practices such as engineering controls should be implemented. Changing the production process of bitumen, as a source control method, was investigated in the study. For the first time, a novel alternative process was used to produce paving grade bitumen with decreased PAH (polycyclic aromatic hydrocarbon) emissions as well as improved bitumen PG (performance grade). Post-consumer latex and NB (natural bitumen) were used as additives to obtain 60/70 modified bitumen directly from the VB (vacuum bottom) without any need for air-blowing. The emissions were produced by a laboratory fume generation rig and were sampled and analyzed by GC-Mass (gas chromatography mass spectrometry) and GC-FID as described in NIOSH method 5515. The PG of the resulting modified 60/70 bitumen in this study covers a wider range of climatic conditions and has higher total resistance against deformation than conventional 60/70 bitumen. The total PAH emissions from modified 60/70 bitumen (100.2619 ng/g) were decreased approximately to 50% of PAHs emitted from conventional 60/70 bitumen (197.696 ng/g). Therefore, it is possible to obtain modified bitumen with lower PAH emissions and better quality than conventional bitumen via additives and without air-blowing.
Decreasing polycyclic aromatic hydrocarbons emission from bitumen using alternative bitumen production process
Rasoulzadeh, Y. (Autor:in) / Mortazavi, S.B. (Autor:in) / Yousefi, A.A. (Autor:in) / Khavanin, A. (Autor:in)
Journal of Hazardous Materials ; 185 ; 1156-1161
2011
6 Seiten, 6 Bilder, 6 Tabellen, 29 Quellen
Aufsatz (Zeitschrift)
Englisch
Bitumens and bitumen emissions, and some n- and s-heterocyclic polycyclic aromatic hydrocarbons
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