Abstract
Textile and Textile dyestuff industries discharge effluent having high Chemical Oxygen Demand (COD) and colour, making it difficult to treat the effluent completely. Several Physical, Chemical and Biological treatment methods are available to treat such an effluent. However, in recent year’s biological treatment with focus on bacteria have been drawing a tremendous attention due to their ability to degrade complex structured dyes and hence treat waste water. In the present study, Soil and Water samples collected from textile dye effluent contaminated sites of Ankleshwar, Gujarat was studied for screening and isolation of bacteria capable of decolorizing and degrading textile dyes. A bacterial consortium ETL-A was selected on the basis of rapid dye decolorization. Bacterial consortium exhibited 93% decolorization ability within 30 h under static conditions at 35oC in presence of Glucose and Yeast Extract as cosubstrates. 16S rRNA gene amplification was carried out for the sequencing and identification of these strains. The degradation of dye was confirmed by HPTLC and FTIR analysis. Considerable decrease in COD of the dye (above 85%) was indicative of conversion of complex dye into simple oxidizable products.
Highlights
Worldwide, dye wastewater has become one of the main sources of severe pollution problems due to the greater demand for textile products and the proportional increase in production and applications of synthetic dyes [1]
A consortium was selected from four consortiums isolated from soil and water samples collected from areas of textile dyeing and printing in Ankleshwar, Gujarat, India and its ability to degrade Reactive Orange M2R (ROM2R) a monoazo dye was analyzed
Four different bacterial consortium namely ETL-A, ETL-B, ETL-C, ETL-4 were isolated by enrichment culture technique using dye ROM2R (100 ppm) and by adding glucose and Yeast Extract as co-substrates
Summary
Dye wastewater has become one of the main sources of severe pollution problems due to the greater demand for textile products and the proportional increase in production and applications of synthetic dyes [1]. Up to 200,000 tons of these dyes are lost to effluents every year during dyeing and finishing operations as a result of inefficiency in the dying process [3,4] Most of these dyes escape conventional wastewater treatment processes and persist in the environment as a result of their high stability against light, temperature, water, detergents, chemicals and microbial attack [5]. It is pertinent to develop efficient treatment strategies for removal of color from dye wastewater Various physicochemical methods, such as adsorption on activated carbon, electro coagulation, flocculation, froth flotation, ion exchange, membrane filtration, ozonation and reverse osmosis have been used for decolorization of dyes in wastewater [8,9]. The degraded product after the treatment with consortium ETL-A was analyzed by HPTLC and FTIR
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