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dc.contributor.advisorChoudhury, Naiyyum
dc.contributor.authorSultana, Banjir
dc.date.accessioned2018-09-18T09:50:44Z
dc.date.available2018-09-18T09:50:44Z
dc.date.copyright2017
dc.date.issued2017-06
dc.identifier.otherID 15176007
dc.identifier.urihttp://hdl.handle.net/10361/10645
dc.descriptionThis thesis report is submitted in partial fulfilment of the requirement for the degree of Master of Science in Biotechnology, 2017.en_US
dc.descriptionCatalogued from PDF version of thesis report.
dc.descriptionIncludes bibliographical references (pages 60-70).
dc.description.abstractThe effluent discharges from textile processing industries contain a significant amount of unreacted dyes. Release of these dyes into the environment causes toxic effects to the environment. The application of microorganisms for biodegradation of dyes is an attractive method for the wastewater treatments. In present study 10 different bacteria isolated from textile effluent were tested for decolorization ability of some common dyes like Novacron Ruby, Novacron Navy, Novacron Yellow Novacron, Novacron Blue dk and Novacron super black dyes. Based on morphological and biochemical characteristics, the isolates were provisionally identified as Micrococcus sp, Bacillus sp, Pseudomonas sp and Enterococcus sp. Out of 10 isolates 3 bacterial isolate found to posses significant decolorization ability and their identification was confirmed by Biolog identification system as Bacillus badius, Bacillus thurengiensis and Enterococcus faecium. The optimum condition for decolorization was observed at pH 7, temperature 37˚C, with 10% inocula size and 100mg/l dye concentration under stationary condition. All the 3 isolates showed maximum decolorization after 72 hrs of incubation. Beef extract and sucrose served as best nitrogen and carbon source respectively for the growth of these organisms. Under optimized condition percent decolorization by Bacillus thurengiensis of all Novacron dyes was 91.2-98.3%, Bacillus badius 89.2-96.4% and Enterococcus faecium 85.1-91.3%.Biodegradation of dyes was confirmed through UV-VIS Spectrophotometer. An experiment on growth of agriculturally important bacteria revealed non toxic nature of decolorized products (100 mg /L) as compared to original dye. Gel electrophoresis study showed the presence of low mol wt protein in the bacterium growing under dye stress condition supporting the mechanism of biodegradation.en_US
dc.description.statementofresponsibilityBanjir Sultana
dc.format.extent80 pages
dc.language.isoenen_US
dc.publisherBRAC Universityen_US
dc.rightsBRAC University theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission.
dc.subjectTextile industryen_US
dc.subjectBacteriaen_US
dc.subjectTextile effluent treatmenten_US
dc.titleDegradation of dyes used in textile Industries by bacteria isolated from local textile effluentsen_US
dc.typeThesisen_US
dc.contributor.departmentDepartment of Mathematics and Natural Sciences, BRAC University
dc.description.degreeM. Biotechnology


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