Decolorization of azo dyes with Klebsiella Pneumoniae under high saline conditions

Textile industries generate colored wastewater after the dyeing process and the color is still visible even at low concentrations such as ~10 ppm. If disposed untreated, they are toxic to the aquatic environment and negatively impact the soil fertility. Bioremediation was considered as the cost-effe...

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Main Author: Gopi, Tejasri
Other Authors: Chen Wei Ning, William
Format: Thesis-Doctor of Philosophy
Language:English
Published: Nanyang Technological University 2021
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Online Access:https://hdl.handle.net/10356/153445
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spelling sg-ntu-dr.10356-1534452023-03-05T16:32:20Z Decolorization of azo dyes with Klebsiella Pneumoniae under high saline conditions Gopi, Tejasri Chen Wei Ning, William Richard D. Webster Interdisciplinary Graduate School (IGS) Nanyang Environment and Water Research Institute Ng Wun Jern WNChen@ntu.edu.sg, Webster@ntu.edu.sg Engineering::Environmental engineering::Water treatment Textile industries generate colored wastewater after the dyeing process and the color is still visible even at low concentrations such as ~10 ppm. If disposed untreated, they are toxic to the aquatic environment and negatively impact the soil fertility. Bioremediation was considered as the cost-effective and environmentally benign alternative over the past two decades. But dyes are large and heavy, structurally complex molecules and hence are not readily degradable. In the typical aerobic wastewater treatment systems, they either got trapped in the sludge or exited untreated requiring downstream processing while anaerobic biological treatment resulted in the formation of aromatic amines that are more toxic, persistent, and carcinogenic as compared to the parent dyes. Besides this, high dosages of salts such as chlorides and sulfates that are another consequence of dyeing often hinder the biodegradation of the dyes. To address these problems, this thesis work focuses on isolating a halotolerant facultative anaerobe that decolorizes and degrades industrially important sulfonated azo dyes in oxygen abundant conditions under the influence of sulfates and chlorides. Further, it involves tracking the fate of the by-products generated during decolorization. Doctor of Philosophy 2021-12-02T06:55:38Z 2021-12-02T06:55:38Z 2021 Thesis-Doctor of Philosophy Gopi, T. (2021). Decolorization of azo dyes with Klebsiella Pneumoniae under high saline conditions. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/153445 https://hdl.handle.net/10356/153445 10.32657/10356/153445 en This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0). application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Environmental engineering::Water treatment
spellingShingle Engineering::Environmental engineering::Water treatment
Gopi, Tejasri
Decolorization of azo dyes with Klebsiella Pneumoniae under high saline conditions
description Textile industries generate colored wastewater after the dyeing process and the color is still visible even at low concentrations such as ~10 ppm. If disposed untreated, they are toxic to the aquatic environment and negatively impact the soil fertility. Bioremediation was considered as the cost-effective and environmentally benign alternative over the past two decades. But dyes are large and heavy, structurally complex molecules and hence are not readily degradable. In the typical aerobic wastewater treatment systems, they either got trapped in the sludge or exited untreated requiring downstream processing while anaerobic biological treatment resulted in the formation of aromatic amines that are more toxic, persistent, and carcinogenic as compared to the parent dyes. Besides this, high dosages of salts such as chlorides and sulfates that are another consequence of dyeing often hinder the biodegradation of the dyes. To address these problems, this thesis work focuses on isolating a halotolerant facultative anaerobe that decolorizes and degrades industrially important sulfonated azo dyes in oxygen abundant conditions under the influence of sulfates and chlorides. Further, it involves tracking the fate of the by-products generated during decolorization.
author2 Chen Wei Ning, William
author_facet Chen Wei Ning, William
Gopi, Tejasri
format Thesis-Doctor of Philosophy
author Gopi, Tejasri
author_sort Gopi, Tejasri
title Decolorization of azo dyes with Klebsiella Pneumoniae under high saline conditions
title_short Decolorization of azo dyes with Klebsiella Pneumoniae under high saline conditions
title_full Decolorization of azo dyes with Klebsiella Pneumoniae under high saline conditions
title_fullStr Decolorization of azo dyes with Klebsiella Pneumoniae under high saline conditions
title_full_unstemmed Decolorization of azo dyes with Klebsiella Pneumoniae under high saline conditions
title_sort decolorization of azo dyes with klebsiella pneumoniae under high saline conditions
publisher Nanyang Technological University
publishDate 2021
url https://hdl.handle.net/10356/153445
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