Thermal treatment of soils contaminated with gas oil: influence of soil composition and treatment temperature
DOI: 10.1016/S0304-3894(02)00081-X
Title: Thermal treatment of soils contaminated with gas oil: influence of soil composition and treatment temperature
Journal Title: Journal of Hazardous Materials
Volume: 94
Issue: 3
Publication Date: 14 October 2002
Start Page: 273
End Page: 290
Published online: online 16 April 2002
ISSN: 0304-3894
Author: Juliana Piñ;a, Jeró;nimo Merino, Alberto F Errazu, Veró;nica Bucalá;
  • PLAPIQUI (UNS — CONICET), Camino La Carrindanga, Km 7 (8000), Bah??a Blanca, Argentina
  • Abstract: of two soils containing different organic matter contents, neat or contaminated with gas oil (diesel fuel oil) at 2.5 wt.% were heated from room temperature to different final temperatures (200–900 °C). The experiments, performed in an anaerobic media, simulate conditions pertinent to ex situ thermal desorptive and thermal destructive treatments. The products generated during the heating were collected and light gases were analyzed by gas chromatography. The results indicate that the chemical composition of the soil is a key factor since it strongly influences the quantity and composition of the off-gases. According to the liquid and light gas yields, the gas oil does not affect appreciably the generation of pyrolysis products of the own soil constituents and the gas oil does not suffer significant chemical transformations even at high operating temperatures (e.g. 900 °C). With surface areas of 16 000 cm2/g (Soil A) and 85 000 cm2/g (Soil B) based on the monolayer adsorbed model, 4 and 20%, respectively, of the original gas oil can be adsorbed. These values are in good agreement with experimental data. Even for high temperatures, the employed thermal treatment is capable to practically remove the gas oil from the soil bed without changing appreciably the original chemical composition of the contaminant.
    Accepted: 22 March 2002
    Received: 5 December 2001
    Revised: 13 March 2002
    Keywords: Soils; Gas oil contamination; Thermal desorption; Soil cleanup; Thermal destruction
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