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Co-metabolic biodegradation of 4-bromophenol in a mixture of pollutants system by Arthrobacter chlorophenolicus A6

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Abstract

Brominated phenols are listed as priority pollutants together with nitrophenol and chlorophenol are the key components of paper pulp wastewater. However, the biodegradation of bromophenol in a mixed substrate system is very scanty. In the present investigation, simultaneous biodegradation kinetics of three substituted phenols 4-bromophenol (4-BP), 4-nitrophenol (4-NP), and 4-chlorophenol (4-CP) were investigated using Arthrobacter chlorophenolicus A6. A 23 full factorial design was applied with varying 4-BP and 4-CP from 75–125 mg/L and 4-NP from 50–100 mg/L. Almost complete degradation of this mixture of substituted phenols was achieved at initial concentration combinations of 125, 125, and 100 mg/L of 4-CP, 4-BP, and 4-NP, respectively, in 68 h. Statistical analysis of the results revealed that, among the three variables, 4-NP had the most prominent influence on the degradation of both 4-CP and 4-BP, while the concentration of 4-CP had a strong negative interaction effect on the biodegradation of 4-NP. Irrespective of the concentration levels of these three substrates, 4-NP was preferentially biodegraded over 4-CP and 4-BP. Furthermore, 4-BP biodegradation rates were found to be higher than those of 4-CP, followed by 4-NP. Besides, the variation of the biomass yield coefficient of the culture was investigated at different initial concentration combinations of these substituted phenols. Although the actinomycetes consumed 4-NP at a faster rate, the biomass yield was very poor. This revealed that the microbial cells were more stressed when grown on 4-NP compared to 4-BP and 4-CP. Overall, this study revealed the potential of A. chlorophenolicus A6 for the degradation of 4-BP in mixed substrate systems.

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All data generated or analysed during this study are included in this manuscript.

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Author contributions

MMS: conduct experiments and collected data, analysed sample and data, writing the draft manuscript and editing. SR formal analysis, visualization, review and editing. AD: conceptualization, supervision, review and editing. NKS: conceptualization, supervision, writing, review, and editing, funding acquisition, project administration, funding resources.

Funding

This study was funded by the financial support received from the Department of Biotechnology Government of India, New Delhi (SAN No. 102/IFD/SAN/3610-3612/2016-2017), for carrying out this research work.

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Correspondence to Naresh Kumar Sahoo.

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Sahoo, M.M., Sahoo, N.K., Daverey, A. et al. Co-metabolic biodegradation of 4-bromophenol in a mixture of pollutants system by Arthrobacter chlorophenolicus A6. Ecotoxicology 31, 602–614 (2022). https://doi.org/10.1007/s10646-021-02508-0

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  • DOI: https://doi.org/10.1007/s10646-021-02508-0

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