Enhanced degradation of azo dye using mixed cultures of white-rot fungi in a modified rotating packed disc bioreactor and reuse of treated water
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Date
2023
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier Ltd
Abstract
Reactive azo dyes are toxic and carcinogenic. In this study, mixed cultures of white-rot fungi (WRF) are used to treat synthetic reactive black 5 (RB-5) wastewater in a modified rotating packed disc bioreactor (RPDB). The continuous degradation studies were carried out for 25 days under the influence of the recycle stream in which 3665 L of synthetic effluent was treated. The dye wastewater was completely decolorized with more than 93 % chemical oxygen demand (COD) reduction using the mixed fungal culture. During the continuous operation, the COD of influent reduced more than 85 % for successive 25 days of continuous operation at hydraulic retention time of 10.8 h. The dry biomass loading was about 0.14 g/g GAC at the end of the continuous process. The rate of COD removal followed first order kinetics with a rate constant of 0.026 per hour. The treated water was reused to produce melanin from microbial culture. © 2023 Elsevier Ltd
Description
Keywords
Azo dyes, Biodegradation, Biological water treatment, Effluents, Fungi, Oxygen, Rate constants, Reusability, Wastewater reclamation, Wastewater treatment, Water conservation, Azo-dyes, Carcinogenics, Chemical-oxygen demands, Continuous operation, Mixed cultures, Reactive azo-dye, Reactive black 5, Reuse, Rotating packed disk bioreactor, White rot fungi, Bioreactors, activated carbon, azo dye, melanin, water, Article, biomass, chemical oxygen demand, concentration (parameter), continuous process, decolorization, degradation, effluent, first order rate constant, fungus culture, hydraulic retention time, kinetics, melanogenesis, metabolite, mixed cell culture, molecular weight, nonhuman, Phanerochaete, Pseudomonas stutzeri, reduction (chemistry), Trametes versicolor, waste water recycling, white rot fungus
Citation
Bioresource Technology Reports, 2023, 22, , pp. -