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Visitors in
The Ruhr: built on energy

RecShow '08

Middle East Recycling, Waste & Environmental
Management Exhibition & Congress

Successfully Concluded on Feb. 19th , 2008


Application for Participation (PDF)
Download Full Brochure (PDF)

Toxic compounds emission from fossil fuels in compression with alternative energies

F.Halek, A.Kavousi
Environmental group, Dept. of Energy
Materials and Energy Research Center
Email: f-halek[at]  -  fhalek[at]

Transportation sources are one of the leading contributors to hazardous air pollutants. The internal combustion engine emits a large percentage of pollutants, but gasoline and diesel in the liquid form also contribute chemical pollution in the form of vaporization of the fuel as it heats and cools within the gas tank. Polycyclic aromatic hydrocarbons (PAHs) are a group of organic compounds made up of two or more fused benzene rings in linear, angular or cluster arrangements. PAHs are considered highly toxic for human beings and several of these compounds are carcinogenic, mutagenic or teratogenic. A major source of PAH in Tehran related to traffic and the number of gasoline and diesel vehicles.

During nearly a 1-year period (throughout 2005) a comprehensive study have done in Tehran area in 21 stations. Sixteen PAHs were detected in all the samples for 2-6 rings PAHs. Concentration of individual compounds was found in the range of 0.76 - 10997.2 ng/m3.
Of the total analyzed PAHs (8089.35 ng/m3), the low molecular weight PAHs were the dominant species, corresponding to 87 % (7038.35 ng/m3)), while high molecular weight PAHs representing 13 % (1051.00 ng/m3) of the total detected PAHs.

Results of PAHs analysis indicated that existence of several of low molecular weights, like Fluoranthene, Fluorene and Phenantherene confirm role of diesel oil emissions in Tehran's atmosphere.

Biodiesel, a renewable energy source is the name for a variety of ester-basted oxygenated fuels (11% oxygen by weight) made from vegetable oils: sunflower, safflower, soybean, palm, cottonseed, rapeseed or peanut. The lifecycle production and use of biodiesel produces approximately 80% less carbon dioxide emissions, and almost 100% less sulphur dioxide. Combustion of biodiesel alone provide over a 90% reduction in total unburned hydrocarbons, and a 75-90% reduction in aromatic hydrocarbons. Biodiesel further provides significant reductions in particulates and carbon monoxide than petroleum diesel fuel. Based on mutagenicity tests, biodiesel provides a 90% reduction in cancer risks.


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