http://dx.doi.org/10.1016/j.jhazmat.2011.03.042">
 

Document Type

Journal Article

Department/Unit

Department of Biology

Title

Synergistic effect of thermophilic temperature and biosurfactant produced by Acinetobacter calcoaceticus BU03 on the biodegradation of phenanthrene in bioslurry system

Language

English

Abstract

This study aimed at investigating the synergistic effect of temperature and biosurfactant on the biodegradation of phenanthrene in bioslurry. Bench-scale bioslurry experiments were conducted at 25 and 55°C. The desorption rate coefficients of phenanthrene (Kdes) obtained using the pseudo-first order model were 0.0026 and 0.0035kgmg-1h-1 at 25 and 55°C, respectively. Addition of 1500mgL-1 biosurfactant, produced by Acinetobacter calcoaceticus BU03, marginally increased the Kdes at 25°C since most of biosurfactant was sorbed onto soil; however, significantly increased the Kdes to 0.0087kgmg-1h-1 at 55°C as the thermophilic temperature reduced the adsorption of the biosurfactant onto soil and subsequently enhanced the desorption of phenanthrene. The biodegradation of phenanthrene well fitted pseudo-first order kinetics based on the assumption that biodegradation was limited by the desorption. About 78.7% of phenanthrene was degraded in 30 days at 25°C; and addition of biosurfactant did not affect the biodegradation. However, addition of the biosurfactant or inoculation of A. calcoaceticus BU03 at 55°C significantly enhanced the biodegradation by increasing the Kdes. Results indicate that synergistic application of thermophilic temperature and biosurfactant or inoculation of biosurfactant producing microorganisms is an effective and innovative method to enhance the efficiency of PAH degradation in bioslurry system. © 2011.

Keywords

Acinetobacter calcoaceticus BU03, Biodegradation, Bioslurry, Biosurfactant, PAH

Publication Date

2011

Source Publication Title

Journal of Hazardous Materials

Volume

190

Issue

3-1

Start Page

345

End Page

350

Publisher

Elsevier

ISSN (print)

03043894

ISSN (electronic)

18733336

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