Azo dye decolorization by a halotolerant consortium under microaerophilic conditions

Guo, Guanhua; Li, Xiaohua; Tian, Fang; Liu, Tingfeng; Yang, Feng; Ding, Keqiang; Liu, Chong; Chen, Jiasheng; Wang, Chongyang

doi:10.1016/j.chemosphere.2019.125510

Cited by 93 publications

(41 citation statements)

References 40 publications

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“…The supernatant was used to determine the decolorization by measuring its absorbance with a UV-Vis spectrophotometer at the following maximum wavelength (λmax): RB5 (λ max 595 nm), RR120 (λ max 537 nm), RB19 (λ max 592 nm), AzB (λ max 650 nm) and AS-GR (λ max 511 nm). The cell growth was also measured in terms of the difference between the optical density (OD) of the collected cell suspension before and after centrifugation at λ max 600 nm (Guo et al, 2020).…”

Section: Decolorization Assay Of Azo Dyesmentioning

confidence: 99%

“…On the other hand, halotolerant organisms can grow under saline conditions, but the elevated concentrations of salt are not necessary for their growth (Kavynifard et al, 2016). Dyeing wastewater always contains a high salt concentration between 3 and 10% NaCl (Guo et al, 2020). Therefore, it is important to use microbial strains capable of tolerating high salt concentrations >3% during the treatment of textile effluents (Giovanella et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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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: Decolorization Assay Of Azo Dyesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…Lalnunhlimi and Krishnaswamy [14] highlighted that the decolorization of mixed azo dyes (Direct Blue 151 and Direct Red 31) was improved while using yeast extract (0.5%) and sucrose (1%). In line with that, several studies [9,[25][26][27] have shown that the supplement of additional carbon and nitrogen sources can enhance the biodegradation of dyes by bacterial strains since the dyes are de cient in nutrient sources.…”

Section: Effect Of Carbon and Nitrogen Sourcesmentioning

confidence: 68%

Biodecolorization of Azo Dye Mixture (Remazol Brilliant Violet 5r and Reactive Red 120) by Indigenous Bacterial Consortium Obtained From Dye Contaminated Soil

Rajendran¹,

Kiruthika²,

Saranya³

et al. 2021

Preprint

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Discharge of the untreated wastewater containing dyestuff into the surrounding aquatic environment is of significant environmental concern. These dying effluents not only change the color of water bodies but also has many unfavorable conditions and release toxic by-products, which are mutagenic, carcinogenic, and hazardous to different life forms. The present study investigated the biodegradation and removal of dye mixture (Remazol Brilliant violet 5R and Reactive Red 120) using a new bacterial consortium isolated from dye contaminated soil. Among the total 15 isolates screened, the two most efficient bacterial species (SS07 and SS09) were selected and identified as Enterobacter cloacae (MT573884) and Achromobacter pulmonis (MT573885) through biochemical assays and 16S rRNA gene sequencing. The removal efficiency of dye mixture by Enterobacter cloacae and Achromobacter pulmonis at an initial concentration of 100 mg L− 1 was 82.78 and 84.96%, discretely. The bacterial consortium was developed using selected isolates, and the optimum conditions for the removal of dyes were investigated by studying the effects of pH, temperature, carbon and nitrogen sources, dye concentration, and inoculum size. The maximum decolorization efficiency was achieved at pH, 7; temperature, 37°C; dye concentration, 100 ppm; and initial inoculum concentration, 0.5 ml, respectively. Mannitol and Ammonium sulfate was identified as the most suitable carbon and nitrogen sources for better bacterial growth and decolorization. The maximum removal efficiency of 91.3% achieved at the optimal conditions after 72 h of incubation. Decolorization of azo dyestuff by the developed microbial consortia conforms to the zero-order reaction kinetics model. Consortia of Enterobacter cloacae and Achromobacter pulmonis was established as an effective decolorizer for the Remazol Brilliant violet 5R and Reactive Red 120 dye mixture with > 90% color removal.

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“…2009; Guo et al . 2020). Nevertheless, the breakdown of azo dyes with the help of bacteria usually tends to produce as well as accumulate additional intractable and noxious aromatic amine compounds that limit their extensive application in wastewater treatment plant containing azo dyes (Davies et al .…”

Section: Introductionmentioning

confidence: 99%

Elucidation of fungal dye‐decolourizing peroxidase (DyP) and ligninolytic enzyme activities in decolourization and mineralization of azo dyes

Rajhans

Sen²,

Barik

et al. 2020

J Appl Microbiol

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Aim The aim of the study is to investigate the efficiency of Geotrichum candidum in the decolourization and mineralization of synthetic azo dyes. Methods and Results It includes screening of enzymes from G. candidum and its optimization, followed by decolourization and mineralization studies. Decolourization was observed to be maximum in methyl orange (94·6%) followed by Congo red (85%), trypan blue (70·4%) and Eriochrome Black T (55·6%) in 48 h, suggesting the plausible degradation of the azo dyes by G. candidum. The enzyme activity study showed that DyP‐type peroxidase has highest activity of 900 mU ml−1 compared to that of laccase (405 mU ml−1) and lignin peroxidase (LiP) (324 mU ml−1) at optimized pH (6) and temperature (35°C). Moreover, the rate of decolourization was found to be directly proportional to the production of laccase and LiP, unlike DyP‐type peroxidase. Furthermore, mineralization study demonstrated reduction in aromatic amines, showing 20% mineralization of methyl orange. Conclusion Geotrichum candidum with its enzyme system is able to efficiently decolourize and mineralize the experimental azo dyes. Significance and Impact of the Study The efficient decolourization and mineralization of azo dyes makes G. candidum a promising alternative in the treatment of textile effluent contaminated with azo dyes.

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Azo dye decolorization by a halotolerant consortium under microaerophilic conditions

Cited by 93 publications

References 40 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

Biodecolorization of Azo Dye Mixture (Remazol Brilliant Violet 5r and Reactive Red 120) by Indigenous Bacterial Consortium Obtained From Dye Contaminated Soil

Elucidation of fungal dye‐decolourizing peroxidase (DyP) and ligninolytic enzyme activities in decolourization and mineralization of azo dyes

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