Volatile and semivolatile emissions from the pyrolysis of almond shell loaded with heavy metals

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Título: Volatile and semivolatile emissions from the pyrolysis of almond shell loaded with heavy metals
Autor/es: Martín-Lara, María Ángeles | Ortuño García, Nuria | Conesa, Juan A.
Grupo/s de investigación o GITE: Residuos, Energía, Medio Ambiente y Nanotecnología (REMAN)
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Ingeniería Química | Universidad de Alicante. Instituto Universitario de Ingeniería de los Procesos Químicos
Palabras clave: Almond shell | Metal | PAHs | Pyrolysis | Semivolatiles
Área/s de conocimiento: Ingeniería Química
Fecha de publicación: 1-feb-2018
Editor: Elsevier
Cita bibliográfica: Science of The Total Environment. 2018, 613-614: 418-427. doi:10.1016/j.scitotenv.2017.09.116
Resumen: Heavy metal-loaded almond shell was subjected to pyrolysis to understand the effect of the presence of different heavy metals on its thermal degradation. Pyrolysis behavior of native and metal-loaded samples was studied by thermogravimetric analysis. Similar shapes of thermogravimetric curves indicate that the presence of cadmium (Cd), chromium (Cr), copper (Cu), nickel (Ni) and lead (Pb) did not change the main degradation pathways of almond shell. However, the temperature at which the decomposition in each stage takes place at a higher rate and char yield was considerably modified by the presence of Cr and Ni. Then, pyrolysis tests of the almond shell samples were performed in a moving tubular reactor at 700 °C. Gases and volatile organic compounds were collected using Tedlar bags and semivolatile organic compounds were collected using a resin as adsorbent. Significant changes were obtained in the composition of the gaseous fraction as a result of the metal impregnation. The main changes in the composition of the gas were observed for Ni-loaded sample, which presented the highest H2 and CO yields. Also, the yields of most of the light hydrocarbons decrease in the presence of metal, while the rest remain quite similar. The total PAH yields reached 103 μg/g for nickel-loaded sample (Nisingle bondAS), 164 μg/g for copper-loaded sample (Cusingle bondAS), 172 μg/g for lead-loaded sample (Pbsingle bondAS), 245 μg/g for native sample (AS), 248 μg/g for cadmium-loaded sample (Cdsingle bondAS) and 283 μg/g for chromium-loaded sample (Crsingle bondAS). Nickel is the most effective in the higher aromatic tar reduction, followed by Cu and Pb, whereas the presence of Cd does not affect the total emissions of PAHs. Finally, the carcinogenic potency of the samples was calculated. Native sample and the sample loaded with Cr presented slightly higher values associated to the presence of small amounts of benzo(a)pyrene.
Patrocinador/es: This work was supported by the University of Granada, Spain [project PP20I5-12 “Characterization and management of byproducts generated in the gasification process of a metal-loaded waste after its use as heavy metal bioadsorbent”); the Ministry of Economy and Competitiveness, Spain [project CTQ2016-76608-R]; and the Valencian Community Government, Spain [project PROMETEOII/2014/007].
URI: http://hdl.handle.net/10045/69267
ISSN: 0048-9697 (Print) | 1879-1026 (Online)
DOI: 10.1016/j.scitotenv.2017.09.116
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © 2017 Published by Elsevier B.V.
Revisión científica: si
Versión del editor: http://dx.doi.org/10.1016/j.scitotenv.2017.09.116
Aparece en las colecciones:INV - REMAN - Artículos de Revistas

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