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Advisor(s)
Abstract(s)
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.
Description
Keywords
Airflow rate Remediation efficiency Remediation time prediction Soil vapor extraction
Citation
Publisher
Elsevier