Azo Dye-Rich Wastewater Treatment by Combined Biodegradation–Adsorption Approach: Optimization, Modeling and Toxicity Analysis
Of various aquatic pollutants, azo dyes are inevitable toxicants appearing in almost all major streams of effluents. Besides being potent mutagens and carcinogens, azo dyes are also often of biorecalcitrant nature. In this study, co-implementation of adsorption and biodegradation has been carried out to achieve complete removal of Direct Red 21 from effluents. This study investigated the potential of graphene oxide as support material for azo dye-degrading bacterial strain (Pseudomonas mendocina). Application of immobilized microorganism offered a number of advantages like higher percentage of dye removal (~99.78%), rise in metabolic activity, and stronger resistance to toxicants. Moreover, this combined approach was cost-effective and re-utilizable without significant loss of activity. The experimental parameters were optimized and modeled using Central Composite Design of Response Surface Methodology. The immobilized GO sheets were characterized using SEM. Toxicity effects of effluents were determined using chickpea seeds (Cicer arietinum). Results proved that the treated water is biologically safe and fit for discharge or reuse in agricultural processes.
KeywordsWastewater treatment Azo dye Immobilization of bacterial cell Graphene oxide Response surface methodology Toxicity analysis
Authors would like to thank the International Society of Waste Management, Air and Water (ISWMAW) for proving a platform to present their work. Authors are grateful to all members of Department of Environmental Science, University of Calcutta and Department of Chemical Engineering, Jadavpur University. Authors also extend their acknowledgement to Mr. Pratyush Sengupta, Center for Research in Nanoscience and Nanotechnology, University of Calcutta, for helping with the SEM analysis.
- 5.Kulandaivel S, Kaleeswari P, Mohanapriya P (2014) Decolorization and adsorption of dyes by consortium of bacteria with agriculture waste. Int J Curr Microbiol Appl Sci 3(12):865–882Google Scholar
- 7.Nguyen DN, Ton NMN, Le VVM (2009) Optimization of Saccharomyces cerevisiae immobilization in bacterial cellulose by ‘adsorption-incubation’ method. Int Food Res J 16:59–64Google Scholar
- 9.Banerjee P, Satapathy M, Mukhopahayay A, Das P (2014) Leaf extract mediated green synthesis of silver nanoparticles from widely available Indian plants: synthesis, characterization, antimicrobial property and toxicity analysis. Biores Bioproc. https://doi.org/10.1186/s40643-014-0003-yCrossRefGoogle Scholar
- 10.Banerjee P, Sarkar S, Dey TK, Bakshi M, Swarnakar S, Mukhopadhyay A, Ghosh S (2014) Application of isolated bacterial consortium in UMBR for detoxification of textile effluent: comparative analysis of resultant oxidative stress and genotoxicity in catfish (Heteropneustes fossilis) exposed to raw and treated effluents. Ecotoxicology 23:1073–1085CrossRefGoogle Scholar
- 13.Goswami MR, Banerjee P, Swarnakar S, Mukhopadhyay A (2013) Carbaryl mediated biochemical alterations in Eggplant (Solanum melongena L.). Int J Environ Sci Technol 3(2):51–57Google Scholar