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Biodegradation of 4-chlorophenol by Arthrobacter chlorophenolicus A6: effect of culture conditions and degradation kinetics

Biodegradation volume 22, pages 275–286 (2011)Cite this article

Abstract

Among known microbial species, Arthrobacter chlorophenolicus A6 has shown very good potential to treat phenolic wastewaters. In this study, the levels of various culture conditions, namely initial pH, agitation (rpm), temperature (°C), and inoculum age (h) were optimized to enhance 4-chlorophenol (4-CP) biodegradation and the culture specific growth rate. For optimization, central composite design of experiments followed by response surface methodology (RSM) was applied. Results showed that among the four independent variables, i.e., pH, agitation (rpm), temperature (°C), and inoculum age (h) investigated in this study, interaction effect between agitation and inoculum age as well as that between agitation and temperature were significant on both 4-CP biodegradation efficiency and culture specific growth rate. Also, at the RSM optimized settings of 7.5 pH, 207 rpm, 29.6°C and 39.5 h inoculum age, 100% biodegradation of 4-CP at a high initial concentration of 300 mg l−1 was achieved within a short span of 18.5 h of culture. The enhancement in the 4-CP biodegradation efficiency was found to be 23% higher than that obtained at the unoptimized settings of the culture conditions. Results of batch growth kinetics of A. chlorophenolicus A6 for various 4-CP initial concentrations revealed that the culture followed substrate inhibition kinetics. Biokinetic constants involved in the process were estimated by fitting the experimental data to several models available from the literature.

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Affiliations

  1. Center for the Environment, Indian Institute of Technology, Guwahati, India

    N. K. Sahoo & A. Ghosh

  2. Department of Biotechnology, Indian Institute of Technology, Guwahati, India

    K. Pakshirajan

  3. Department of Civil Engineering, Indian Institute of Technology, Guwahati, India

    P. K. Ghosh

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  1. N. K. Sahoo
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  2. K. Pakshirajan
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  3. P. K. Ghosh
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  4. A. Ghosh
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Correspondence to K. Pakshirajan.

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Sahoo, N.K., Pakshirajan, K., Ghosh, P.K. et al. Biodegradation of 4-chlorophenol by Arthrobacter chlorophenolicus A6: effect of culture conditions and degradation kinetics. Biodegradation 22, 275–286 (2011). https://doi.org/10.1007/s10532-010-9396-2

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Keywords

  • 4-Chlorophenol
  • Arthrobacter chlorophenolicus A6
  • Biodegradation
  • Optimization
  • Substrate inhibition kinetics
  • Edward model