Optimization of phenol degradation by Antarctic bacterium Rhodococcus sp.

Tengku Athirrah Tengku-Mazuki, Kavilasni Subramaniam, Nur Nadhirah Zakaria, Peter Convey, Khalilah Abdul Khalil, Gillian Li Yin Lee, Azham Zulkharnain, Noor Azmi Shaharuddin, Siti Aqlima Ahmad

研究成果: Review article査読

6 被引用数 (Scopus)

抄録

This study focused on the ability of the Antarctic bacterium Rhodococcus sp. strain AQ5-14 to survive exposure to and to degrade high concentrations of phenol at 0.5 g l-1. After initial evaluation of phenol-degrading performance, the effects of salinity, pH and temperature on the rate of phenol degradation were examined. The optimum conditions for phenol degradation were pH 7 and 0.4 g l-1 NaCl at a temperature of 25°C (83.90%). An analysis using response surface methodology (RSM) and the Plackett-Burman design identified salinity, pH and temperature as three statistically significant factors influencing phenol degradation. The maximum bacterial growth was observed (optical density at 600 nm = 0.455), with medium conditions of pH 6.5, 22.5°C and 0.47 g l-1 NaCl in the central composite design of the RSM experiments enhancing phenol degradation to 99.10%. A central composite design was then used to examine the interactions among these three variables and to determine their optimal levels. There was excellent agreement (R2 = 0.9785) between experimental and predicted values, with less strong but still good agreement (R2 = 0.8376) between the predicted model values and those obtained experimentally under optimized conditions. Rhodococcus sp. strain AQ5-14 has excellent potential for the bioremediation of phenol.

本文言語English
ページ(範囲)486-495
ページ数10
ジャーナルAntarctic Science
32
6
DOI
出版ステータスPublished - 2020 12

ASJC Scopus subject areas

  • 海洋学
  • 生態、進化、行動および分類学
  • 地質学

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