Journal
BIORESOURCE TECHNOLOGY
Volume 302, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.122811
Keywords
Biodegradation; Response surface methodology; Congo red dye; Moving bed biofilm reactor; Elimination capacity
Funding
- Ministry of Human Resource Development (MHRD), New Delhi, India
- Scheme for Promotion of Academic and Research Collaboration (SPARC), India
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The biodegradation of Congo red dye was performed using polyurethane foam-polypropylene immobilized Bacillus sp. MH587030.1 in a moving bed biofilm reactor (MBBR). The central composite design (CCD) based response surface methodology (RSM) was used to optimize the process parameters; pH, Congo red concentration, and media filling ratio, and optimum conditions were observed to be 7.0, 50 mg/L, and 45%, respectively in batch MBBR. At optimum condition, MBBR was operated in continuous mode at different flow rates (25-100 mL/h) over a period of 564 h. The maximum removal efficiency (RE) and elimination capacity (EC) were obtained as 95.7% and 57.6 mg/L center dot day, respectively under steady-state. The kinetics of Congo red biodegradation at various flow rates were evaluated by a modified Stover-Kincannon model, and kinetic constants; K-B and U-max were found to be 0.253 g/L center dot day and 0.263 g/L center dot day, respectively.
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