Study of multicompound sorption of Lead and Pyrene on a reconstituted soil: batch and fixed bed column tests

Many polluted sites are simultaneously contaminated with polycyclic aromatic hydrocarbons and heavy metals. In the present study, batch and continuous column experiments were performed utilizing self-composition soil to describe the sorption behavior of two contaminants: lead (Pb 2+ ) and pyrene (PY...

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Bibliographic Details
Published in:Soil & sediment contamination 2017-05, Vol.26 (4), p.404-425
Main Authors: Aissaoui, Jihène, Kacem, Mariem, Dubujet, Philippe, Mgaidi, Arbi
Format: Article
Language:English
Subjects:
Adsorption
Aromatic compounds
Aromatic hydrocarbons
Composition
Contaminants
Engineering Sciences
Flow rates
Flow velocity
Heavy metals
Isotherms
Langmuir and Freundlich isotherms
Lead
lead and pyrene
Metals
Model accuracy
Organic matter
Organic soils
Polycyclic aromatic hydrocarbons
Pyrene
saturated soil
Soil
Soil contamination
Soil organic matter
Soil pollution
Sorption
Sorption kinetics
Temperature
Thomas and TSFO models
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Summary:Many polluted sites are simultaneously contaminated with polycyclic aromatic hydrocarbons and heavy metals. In the present study, batch and continuous column experiments were performed utilizing self-composition soil to describe the sorption behavior of two contaminants: lead (Pb 2+ ) and pyrene (PYR). Operational conditions such as contact time, bed depth, and flow rate were optimized. The effect of soil organic matter content on the process of adsorption of both contaminants was investigated. The presence of PYR in solution at neutral pH (6.0-7.5) decreased Pb 2+ sorption. Similar behavior was observed for PYR in the presence of Pb 2+ in solution. At room temperature, batch experimental data conducted as a function of contact time were analyzed using the Langmuir and Freundlich isotherms. Results revealed that Pb 2+ sorption isotherms were fitted better by the Langmuir model and PYR sorption isotherms were fitted better by the Freundlich model. Column adsorption experiments were carried out at room temperature and under operating parameters (bed depth, flow rate, and initial contaminant concentration). Breakthrough curves were well fitted to the two-site first-order kinetic model with a sum of square errors less than 0.14. The Pb 2+ adsorption kinetic data were processed also for the Thomas model with a good accuracy.
ISSN:1532-0383
1549-7887
DOI:10.1080/15320383.2017.1339667