Azo dye degrading bacteria tolerant to extreme conditions inhabit nearshore ecosystems: Optimization and degradation pathways

Zhuang, Mei; Sanganyado, Edmond; Zhang, Xinxin; Xu, Le; Zhu, Jianming; Liu, Wenhua; Song, Hongbing

doi:10.1016/j.jenvman.2020.110222

Cited by 86 publications

(34 citation statements)

References 35 publications

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“…Subsequently, both compounds I and IV, were probably further oxidatively transformed into smaller compounds through the routes A and B (Figure 10). As reported previously, aromatic amines produced during dye decolorization can be further degraded into smaller compounds and may eventually be mineralized (Oturkar et al, 2011;El Bouraie and El Din, 2016;Martorell et al, 2017;Zhuang et al, 2020). For route A, the compound I, which might be produced from the desulfonation of TAHNDS, was probably deaminated into naphthalene-1,2,4-triol (compound II; RT 23.19 min; m/z 176).…”

Section: Analysis Of Intermediates Produced In the Decolorization Of mentioning

confidence: 70%

Performance of a Newly Isolated Salt-Tolerant Yeast Strain Sterigmatomyces halophilus SSA-1575 for Azo Dye Decolorization and Detoxification

et al. 2020

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The effective degradation of hazardous contaminants remains an intractable challenge in wastewater processing, especially for the high concentration of salty azo dye wastewater. However, some unique yeast symbionts identified from the termite gut system present an impressive function to deconstruct some aromatic compounds, which imply that they may be valued to work on the dye degradation for various textile effluents. In this investigation, a newly isolated and unique yeast strain, Sterigmatomyces halophilus SSA-1575, was identified from the gut system of a wood-feeding termite (WFT), Reticulitermes chinensis. Under the optimized ambient conditions, the yeast strain SSA-1575 showed a complete decolorization efficiency on Reactive Black 5 (RB5) within 24 h, where this azo dye solution had a concentration of a 50 mg/L RB5. NADH-dichlorophenol indophenol (NADH-DCIP) reductase and lignin peroxidase (LiP) were determined as the key reductase and oxidase of S. halophilus SSA-1575. Enhanced decolorization was recorded when the medium was supplemented with carbon and energy sources, including glucose, ammonium sulfate, and yeast extract. To understand a possible degradation pathway well, UV-Vis spectroscopy, FTIR and Mass Spectrometry analyses were employed to analyze the possible decolorization pathway by SSA-1575. Determination of relatively high NADH-DCIP reductase suggested that the asymmetric cleavage of RB5 azo bond was mainly catalyzed by NADH-DCIP reductase, and finally resulting in the formation of colorless aromatic amines devoid of any chromophores. The ecotoxicology assessment of RB5 after a decolorization processing by SSA-1575, was finally conducted to evaluate the safety of its metabolic intermediates from RB5. The results of Microtox assay indicate a capability of S. halophilus SSA-1575, in the detoxification of the toxic RB5 pollutant. This study revealed the effectiveness of halotolerant yeasts in the eco-friendly remediation of hazardous pollutants and dye wastewater processing for the textile industry.

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Section: Analysis Of Intermediates Produced In the Decolorization Of mentioning

confidence: 70%

Performance of a Newly Isolated Salt-Tolerant Yeast Strain Sterigmatomyces halophilus SSA-1575 for Azo Dye Decolorization and Detoxification

et al. 2020

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“…It is banned for more than 20 years due to its carcinogenic nature, but it is still regularly used in many countries [50]. Reactive orange (RO) and congo red (CR) dyes are extensively used in dyeing industries and reported to affect the algal and bacterial growth [32,51]. Methylene (MB) blue dye is reported to increase blood pressure, hypertension and mycocardardial depression [40].…”

Section: Ecotoxicological and Health Concern Of Textile Industry Wastewater Pollutantsmentioning

confidence: 99%

Ecotoxicological and health concerns of persistent coloring pollutants of textile industry wastewater and treatment approaches for environmental safety

Kishor

Purchase

Saratale

et al. 2021

Journal of Environmental Chemical Engineering

706

186

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“…Scaling up the process also remains a challenge. Since metal ions like Copper, Lead, and Cadmium are present in high concentration in industrial effluents [23], it is also important to study their effects individually on azo dye bioremediation.…”

Section: Discussionmentioning

confidence: 99%

“…Often textile waste waters have high metal content and salinity; hence, it is important to utilize microorganisms tolerant to extreme environment conditions. Bacterial species like Enterococcus faecalis and C. bufermentas have been identified as highly halotolerant azo dye degrading microorganisms [23].…”

Section: Introductionmentioning

confidence: 99%

Decolorization of azo dyes by newly isolated Citrobacter sp. strain EBT-2 and effect of various parameters on decolourization

Thapa¹,

Gaur²

2021

J App Biol Biotech

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Azo dyes constitute around 70% of the total dyes in the world. Almost 10%-15% of dye is released in wastewater during manufacture of the dye and its application, and is a prime source of pollution. Various physiochemical methods available for their decolorization have some or the other disadvantages like cost or time inefficiency. Hence, bacterial decolorization has been studied for cheap and efficient decolorization. In this study, Citrobacter sp. strain EBT-2 was isolated from a textile industry dumping site and used to optimize dye decolorization conditions for three Azodyes: methyl orange (MO), congo red (CR), and Eriochrome Black T (EBT). Decolorization was measured by UV-Vis spectroscopy analysis. The strain showed 100% decolorization for all the three dyes up to 100 mg/l concentration in 96-120 hours. It was able to decolorize till 300, 500, and 500 mg/l of dye concentration for MO, CR, and EBT, respectively. Decolorization efficiency was independent of initial dye concentration. Optimum pH for decolorization was 7, 7, and 9 for MO, CR, and EBT, respectively. The effect of agitation on decolorization was studied under static and agitated (200 rpm) condition. About 90% decolorization was observed at static condition and about 20% decolorization was observed under agitated condition in all the three dyes in 96 hours. Complete decolorization was obtained for MO and EBT at 35°C and 45°C, respectively. CR showed complete decolorization only at 35°C. The results conclude that Citrobacter sp. can be used for the successful dye decolorization of Azo dyes, primarily MO, CR, and EBT under optimum physiochemical conditions.

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Azo dye degrading bacteria tolerant to extreme conditions inhabit nearshore ecosystems: Optimization and degradation pathways

Cited by 86 publications

References 35 publications

Performance of a Newly Isolated Salt-Tolerant Yeast Strain Sterigmatomyces halophilus SSA-1575 for Azo Dye Decolorization and Detoxification

Performance of a Newly Isolated Salt-Tolerant Yeast Strain Sterigmatomyces halophilus SSA-1575 for Azo Dye Decolorization and Detoxification

Ecotoxicological and health concerns of persistent coloring pollutants of textile industry wastewater and treatment approaches for environmental safety

Decolorization of azo dyes by newly isolated Citrobacter sp. strain EBT-2 and effect of various parameters on decolourization

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