Abstract
In the present work, the biodegradation of naphthalene (polycyclic aromatic hydrocarbon) has been studied using isolated Bacillus cereus RKS4 (MH681588.1). The process variables such as pH (5.0–9.0), temperature (25–40°C), and naphthalene concentration (10–50mg/L) have been optimized using central composite design (CCD) of response surface methodology (RSM). Analysis of variance (ANOVA) shows a high value of R2 (0.98) and confirm that the second-order regression model is in agreement with experimental data. The maximum removal of naphthalene (96.1%) were obtained at pH of 7.0, naphthalene concentration of 10mg/L, and temperature of 32.0°C. Further, the biodegradation of naphthalene was studied in a pilot-scale integrated aerobic treatment plant (IATP) at various flow rates. GC–MS analysis reveals that catechol and 2-naphthol were the major intermediate metabolites observed during biodegradation. The kinetics of naphthalene biodegradation was examined by Monod and Teissier-Edwards models and kinetic parameters were obtained to be μmax: 0.165 per day, KS: 7.91mg/L by Monod and μmax: 0.321 per day, KS: 11.5mg/L, Ki: 33.2mg/L by Teissier-Edwards.
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