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Enhanced Soil Remediation via Plant-Based Surfactant Compounds from Acanthophyllum Laxiusculum

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Published/Copyright: July 9, 2016
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Abstract

In the present study, an aqueous root-extract of Acanthophyllum laxiusculum (AREAL) was evaluated for phenanthrene removal from two samples of contaminated soil. AREAL showed a linear solubilization enhancement for phenanthrene with a weight solubilization ratio of 0.05. Batch soil washing experiments caused the removal of phenanthrene with efficiencies of 96.7 % and 78 % from soils with 0.78 % and 2.73 % organic carbon, respectively. Desorption kinetics of phenanthrene exhibited a two-phase pattern, namely, a rapid release as the initial phase and a slower removal as a subsequent phase. A two-compartment exponential model could adequately represent the two phases of the kinetic pattern of phenanthrene desorption. The rise of pH from acidic to basic levels, decreased phenanthrene removal due to changes in the micelle number of the surfactant phase. Maximum achievable yield of removal was 82 % phenanthrene in a column experiment at defined operational conditions. High removal efficiencies show the potential application of AREAL for improving the bioremediation of polycyclic aromatic hydrocarbons (PAHs) from contaminated soils.

Kurzfassung

In dieser Studie wird die Eignung des wässrigen Wurzelextrakts aus Acanthophyllum laxiusculum (AREAL) für die Entfernung von Phenanthren aus zwei kontaminierten Bodenproben bewertet. In AREAL steigerte sich die Löslichkeit von Phenanthren mit einem Verhältnis von Masse zu Löslichkeit von 0,5 linear. Bodenreinigungsexperimente im Batchverfahren lieferten eine Phenanthren-Entfernung von 96,7 % bzw. 78 % aus Böden mit 0,78 % bzw. 2,73 % organischem Kohlenstoffgehalt. Die Desorptionskinetik von Phenanthren zeigt ein zweiphasiges Verhalten, eine schnelle Phase zu Beginn, gefolgt von einer langsameren Phase. Ein Zweikomponenten-Exponentialmodell konnte die beiden Phasen des kinetischen Verlaufs der Phenanthren-Desorption adäquat wiedergeben. Mit Anstieg der pH-Werte aus dem sauren in den basischen Bereich sinkt die Phenanthren-Entfernung aufgrund der Änderungen der Mizellenzahl in der Tensidphase ab. Maximal konnten 82 % Phenanthren im Säulenexperiment unter definierten Betriebsbedingungen entfernt werden. Die hohe Entfernungseffizienz weist auf eine mögliche Anwendung von AREAL zur Verbesserung der Entfernung von polyzyklischen aromatischen Kohlenwasserstoffen (PAHs) aus kontaminierten Böden hin.


*Correspondence address, Dr. Tayebe Bahgeri Lotfabad, Department of Energy and Environmental Biotechnology, Institute of Industrial and Environmental Biotechnology (IIEB), National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran, Tel.: +9821-44787321, Fax: +9821-44787399, E-Mail:

T. B. Lotfabad, the corresponding author of this paper is the faculty member of National Institute of Genetic engineering and Biotechnology (NIGEB). She is graduated in chemical engineering (at PhD degree) from Sharif University of Technology (SUT). Her curriculum vitae and contact information is available at website of institute by this address: http://en.nigeb.ac.ir/c/document_library/get_file?uuid=54ede2d9-8129-4760-aed2-78fc8ed421cd&groupId=10125

S. Yaghmaei is a professor and faculty member at Chemical & Petroleum Engineering Department, Sharif University of Technology, Her curriculum vitae and contact information is available at website of Sharif University of Technology by this address: http://che.sharif.ir/index.html/index.php?Service=profile&Task=SHOW&Item=yaghmaei

H. Soltaninejad has been the student in chemical engineering at Chemical & Petroleum Engineering Department, Sharif University of Technology who contributed extensively to the work presented in this paper. Her email address is:


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Received: 2015-08-19
Accepted: 2016-03-11
Published Online: 2016-07-09
Published in Print: 2016-07-15

© 2016, Carl Hanser Publisher, Munich

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