Degradation of reactive red 195 by selected bacteria from textile wastewater

Four selected bacterial strains coded R1, R2, Rc and Rd were successfully isolated from raw textile wastewater. They were screened for their ability to degrade an azo dye of Reactive Red 195 on solid and in liquid dye-containing media. Screening showed that decolourization was best performed under a...

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Main Author:	Nawahwi, Mohd. Zaini
Format:	Thesis
Language:	English
Published:	2009
Subjects:	Q Science (General)
Online Access:	http://eprints.utm.my/id/eprint/11102/1/MohdZainiNawahwiMFS2009.pdf
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spelling	my-utm-ep.111022018-06-04T09:51:18Z Degradation of reactive red 195 by selected bacteria from textile wastewater 2009-06 Nawahwi, Mohd. Zaini Q Science (General) Four selected bacterial strains coded R1, R2, Rc and Rd were successfully isolated from raw textile wastewater. They were screened for their ability to degrade an azo dye of Reactive Red 195 on solid and in liquid dye-containing media. Screening showed that decolourization was best performed under anaerobic condition with the highest colour removal (˜70%) showed by bacterium R2. The partial 16S ribosomal ribonucleic acid (16S rRNA) sequence of bacterium R2 shared 98% sequence similarity to Paenibacillus sp.. Decolourization by this bacterium in a chemically defined medium containing (gL-1) of glucose (1), NH4Cl (0.5), K2HPO4 (7), KH2PO4 (2), MgSO4.7H2O (0.1), CaCl2 (0.02), and Reactive red 195 (0.1), adjusted to pH7 and with (10% v/v) inoculum occurred under partial anaerobic condition at temperature of 37°C. Under optimized condition, bacterium R2 successfully removed more than 95% colour and up to 50% of total organic carbon. No significant change in pH was observed (pH from 7.21 to 7.25) though the anaerobiosis was found to be developed throughout the experiment (redox potential reduced from 2.5 to 0.5 mV). This bacterium produced intracellular (0.033 U/mL) and extracellular (0.026 U/mL) azoreductase enzymes which were found to be stable at pH from 6 to 8 and temperature ranging from 30 ºC to 40ºC. High performance liquid chromatography analysis revealed that biodegradation of Reactive Red 195 under partial anaerobic condition produced at least three types of sulfonated amines which were 4-aminobenzenesulphonic acid (sulphanilic acid), 4-amino-3- hydronapthalenesulphonic acid and 4-amino-5-hydronapthalene-2,7disulphonic acid. The sulphanilic acid can be further degraded to a-ketoglutaric acid, a common Krebs cycle’s intermediate in most aerobic microorganism. Therefore, it can be concluded that the Paenibacillus sp. is of good potential use for the treatment of azo dye-containing wastewater based on its ability to remove colour. 2009-06 Thesis http://eprints.utm.my/id/eprint/11102/ http://eprints.utm.my/id/eprint/11102/1/MohdZainiNawahwiMFS2009.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	Q Science (General)
spellingShingle	Q Science (General) Nawahwi, Mohd. Zaini Degradation of reactive red 195 by selected bacteria from textile wastewater
description	Four selected bacterial strains coded R1, R2, Rc and Rd were successfully isolated from raw textile wastewater. They were screened for their ability to degrade an azo dye of Reactive Red 195 on solid and in liquid dye-containing media. Screening showed that decolourization was best performed under anaerobic condition with the highest colour removal (˜70%) showed by bacterium R2. The partial 16S ribosomal ribonucleic acid (16S rRNA) sequence of bacterium R2 shared 98% sequence similarity to Paenibacillus sp.. Decolourization by this bacterium in a chemically defined medium containing (gL-1) of glucose (1), NH4Cl (0.5), K2HPO4 (7), KH2PO4 (2), MgSO4.7H2O (0.1), CaCl2 (0.02), and Reactive red 195 (0.1), adjusted to pH7 and with (10% v/v) inoculum occurred under partial anaerobic condition at temperature of 37°C. Under optimized condition, bacterium R2 successfully removed more than 95% colour and up to 50% of total organic carbon. No significant change in pH was observed (pH from 7.21 to 7.25) though the anaerobiosis was found to be developed throughout the experiment (redox potential reduced from 2.5 to 0.5 mV). This bacterium produced intracellular (0.033 U/mL) and extracellular (0.026 U/mL) azoreductase enzymes which were found to be stable at pH from 6 to 8 and temperature ranging from 30 ºC to 40ºC. High performance liquid chromatography analysis revealed that biodegradation of Reactive Red 195 under partial anaerobic condition produced at least three types of sulfonated amines which were 4-aminobenzenesulphonic acid (sulphanilic acid), 4-amino-3- hydronapthalenesulphonic acid and 4-amino-5-hydronapthalene-2,7disulphonic acid. The sulphanilic acid can be further degraded to a-ketoglutaric acid, a common Krebs cycle’s intermediate in most aerobic microorganism. Therefore, it can be concluded that the Paenibacillus sp. is of good potential use for the treatment of azo dye-containing wastewater based on its ability to remove colour.
format	Thesis
qualification_level	Master's degree
author	Nawahwi, Mohd. Zaini
author_facet	Nawahwi, Mohd. Zaini
author_sort	Nawahwi, Mohd. Zaini
title	Degradation of reactive red 195 by selected bacteria from textile wastewater
title_short	Degradation of reactive red 195 by selected bacteria from textile wastewater
title_full	Degradation of reactive red 195 by selected bacteria from textile wastewater
title_fullStr	Degradation of reactive red 195 by selected bacteria from textile wastewater
title_full_unstemmed	Degradation of reactive red 195 by selected bacteria from textile wastewater
title_sort	degradation of reactive red 195 by selected bacteria from textile wastewater
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2009
url	http://eprints.utm.my/id/eprint/11102/1/MohdZainiNawahwiMFS2009.pdf
_version_	1747814811139309568

Degradation of reactive red 195 by selected bacteria from textile wastewater

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