Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/3003
Título: Soil remediation time to achieve clean-up goals II: influence of natural organic matter and water contents
Autor: Alvim-Ferraz, Maria da Conceição M.
Albergaria, José Tomás
Delerue-Matos, Cristina
Palavras-chave: Soil vapour extraction
Soil water content
Natural organic matter content
Process efficiency
Remediation time
Contaminant distribution
Data: 2006
Editora: Elsevier
Relatório da Série N.º: Chemosphere; Vol. 64, Issue 5
Resumo: This work reports a relatively rapid procedure for the forecasting of the remediation time (RT) of sandy soils contaminated with cyclohexane using vapour extraction. The RT estimated through the mathematical fitting of experimental results was compared with that of real soils. The main objectives were: (i) to predict the RT of soils with natural organic matter (NOM) and water contents different from those used in experiments; and (ii) to analyse the time and efficiency of remediation, and the distribution of contaminants into the soil matrix after the remediation process, according to the soil contents of: (ii1) NOM; and (ii2) water. For sandy soils with negligible clay contents, artificially contaminated with cyclohexane before vapour extraction, it was concluded that: (i) if the NOM and water contents belonged to the range of the prepared soils, the RT of real soils could be predicted with relative differences not higher than 12%; (ii1) the increase of NOM content from 0% to 7.5% increased the RT (1.8–13 h) and decreased the remediation efficiency (RE) (99–90%) and (ii2) the increase of soil water content from 0% to 6% increased the RT (1.8–4.9 h) and decreased the RE (99–97%). NOM increases the monolayer capacity leading to a higher sorption into the solid phase. Increasing of soil water content reduces the mass transfer coefficient between phases. Concluding, NOM and water contents influence negatively the remediation process, turning it less efficient and more time consuming, and consequently more expensive.
Peer review: yes
URI: http://hdl.handle.net/10400.22/3003
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S0045653505012804
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