End of Life Tires as a Possible Source of Toxic Substances Emission in the Process of Combustion

Irina Glushankova, Aleksandr Ketov, Marina Krasnovskikh, Larisa Rudakova and Iakov Vaisman
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Irina Glushankova: Department of Environmental Engineering, Perm National Research Polytechnic University, Perm 614990, Russia
Aleksandr Ketov: Department of Environmental Engineering, Perm National Research Polytechnic University, Perm 614990, Russia
Marina Krasnovskikh: Department of Inorganic Chemistry, Chemical Technology and Technosphere Safety, Perm State National Research University, Perm 614000, Russia
Larisa Rudakova: Department of Environmental Engineering, Perm National Research Polytechnic University, Perm 614990, Russia
Iakov Vaisman: Department of Environmental Engineering, Perm National Research Polytechnic University, Perm 614990, Russia

Resources, 2019, vol. 8, issue 2, 1-10

Abstract: Several million tons of end of life tires (ELTs) are piled annually as a result of human activities. Various methods have been proposed for the extraction and recycling of the resource potential of ELTs. The chemical composition of ELTs seems to enable their usage as a fuel after mechanical separation of a steel cord. Indeed, in the rubber of ELTs, up to 90 mass% accounts for carbon and hydrogen. Currently, it is by incineration that a significant proportion of ELTs is utilized. However, ELTs contain not only sulfur, which is used for vulcanization, but also nitrogen-containing additives. The behavior of these heteroatoms during oxidation is poorly investigated. It has been shown that the pyrolysis liquid fuel obtained from ELTs contains such sulfur compounds as mercaptans and nitrogen in the form of hydrocyanic acid and cyanogen. Deep oxidation of ELTs results in the oxidation of sulfur compounds to dioxide, but the oxidation products have been found to contain traces of cyanogen. Taking this into account, one should pay attention to the ways of transforming heteroatoms during the process of ELT oxidation and the products of ELT pyrolysis as potential sources of highly toxic gas emissions.

Keywords: end of life tires; thermal methods; energy resource; heteroatoms; ecology (search for similar items in EconPapers)
JEL-codes: Q1 Q2 Q3 Q4 Q5 (search for similar items in EconPapers)
Date: 2019
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