Remediation of sandy soils contaminated with hydrocarbons and halogenated hydrocarbons by soil vapour extraction

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:104

Article

Albergaria, Jose Tomas¹  Alvim-Ferraz, Maria da Conceicao M.²  Delerue-Matos, Cristina¹ 

[1] Inst Super Engn Porto, REQUIMTE, P-4200072 Oporto, Portugal

[2] Univ Porto, Fac Engn, Dept Engn Quim, LEPAE, P-4200465 Oporto, Portugal

关键词: Soil vapour extraction;    Sandy soils;    Water content;    Process efficiency;    Remediation time estimation;   

DOI  :  10.1016/j.jenvman.2012.03.033

来源: Elsevier

【 摘 要 】

This paper presents the study of the remediation of sandy soils containing six of the most common contaminants (benzene, toluene, ethylbenzene, xylene, trichloroethylene and perchloroethylene) using soil vapour extraction (SVE). The influence of soil water content on the process efficiency was evaluated considering the soil type and the contaminant. For artificially contaminated soils with negligible clay contents and natural organic matter it was concluded that: (i) all the remediation processes presented efficiencies above 92%; (ii) an increase of the soil water content led to a more time-consuming remediation; (iii) longer remediation periods were observed for contaminants with lower vapour pressures and lower water solubilities due to mass transfer limitations. Based on these results an easy and relatively fast procedure was developed for the prediction of the remediation times of real soils; 83% of the remediation times were predicted with relative deviations below 14%. (C) 2012 Elsevier Ltd. All rights reserved.

【 授权许可】

Free