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

Zhenyong Zhao, Ammaiyappan Selvam, Jonathan W C WONG*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)345-350
Number of pages6
JournalJournal of Hazardous Materials
Volume190
Issue number1-3
DOIs
Publication statusPublished - 15 Jun 2011

Scopus Subject Areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

User-Defined Keywords

  • Acinetobacter calcoaceticus BU03
  • Biodegradation
  • Bioslurry
  • Biosurfactant
  • PAH

Fingerprint

Dive into the research topics of 'Synergistic effect of thermophilic temperature and biosurfactant produced by Acinetobacter calcoaceticus BU03 on the biodegradation of phenanthrene in bioslurry system'. Together they form a unique fingerprint.

Cite this