Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/2940
Título: Soil vapor extraction in sandy soils: influence of airflow rate
Autor: Albergaria, José Tomás
Alvim-Ferraz, Maria da Conceição M.
Delerue-Matos, Cristina
Palavras-chave: Airflow rate
Remediation efficiency
Remediation time prediction
Soil vapor extraction
Data: 2008
Editora: Elsevier
Relatório da Série N.º: Chemosphere; Vol. 73, Issue 9
Resumo: Airflow rate is one of the most important parameters for the soil vapor extraction of contaminated sites, due to its direct influence on the mass transfer occurring during the remediation process. This work reports the study of airflow rate influence on soil vapor extractions, performed in sandy soils contaminated with benzene, toluene, ethylbenzene, xylene, trichloroethylene and perchloroethylene. The objectives were: (i) to analyze the influence of airflow rate on the process; (ii) to develop a methodology to predict the remediation time and the remediation efficiency; and (iii) to select the most efficient airflow rate. For dry sandy soils with negligible contents of clay and natural organic matter, containing the contaminants previously cited, it was concluded that: (i) if equilibrium between the pollutants and the different phases present in the soil matrix was reached and if slow diffusion effects did not occur, higher airflow rates exhibited the fastest remediations, (ii) it was possible to predict the remediation time and the efficiency of remediation with errors below 14%; and (iii) the most efficient remediation were reached with airflow rates below 1.2 cm3 s 1 standard temperature and pressure conditions.
Peer review: yes
URI: http://hdl.handle.net/10400.22/2940
ISSN: 0045-6535
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S004565350801000X
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