Synthetic organic dyes as contaminants of the aquatic environment and their implications for ecosystems: A review

Tkaczyk, Angelika; Mitrowska, Kamila; Posyniak, Andrzej

doi:10.1016/j.scitotenv.2020.137222

Cited by 1,094 publications

(409 citation statements)

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“…It is estimated that 20-50% of these dyes remain unfixed during the dyeing processes and ultimately end up in the dye effluents (Giovanella et al, 2020), leading to severe pollution of water supplies in the vicinity of dyeing industries (Neetha et al, 2019). Hence, many governments have established environmental laws and restrictions not only for aesthetic reasons but also due to the serious ecological risks and toxicity on aquatic flora, as well as the mutagenicity and carcinogenicity of azo dye degradation products (Yang et al, 2018;Ali et al, 2019;Tkaczyk et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Azo dyes, which represent one of the largest consuming dyestuff categories around the world, are major contributors that trigger severe environmental pollution issues due to their extensive use in textile and leather dyeing, paper printing, cosmetics and many other industries (Pattanaik et al, 2020;Tkaczyk et al, 2020). Azo dyes are often recalcitrant to biodegradation processes, as their chemical structure contains one or more azo bonds (Arora, 2015).…”

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: Introductionmentioning

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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“…Synthetic dyes with strong carcinogenic polycyclic aromatic hydrocarbons as raw materials have become more commonly used dyes in the printing and dyeing industry because of their stable physical and chemical properties and low cost. Wastewater from the printing and dyeing industry is discharged into freshwater without treatment, which seriously affects the growth of aquatic organisms and microorganisms (Mishra & Maiti, 2018), and destroys the self-purification of water bodies (Tkaczyk, Mitrowska & Posyniak, 2020;Gowri, Vijayarghavan & Meenambigai, 2014). At the same time, azo and anthraquinone dyes will produce a variety of carcinogenic aromatic amines during specific decomposition, which can cause cancer, mutagenesis, and reproductive toxicity (Ali et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Improving decolorization of dyes by laccase from Bacillus licheniformis by random and site-directed mutagenesis

Yang

Zhang

et al. 2020

PeerJ

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Background Dye wastewater increases cancer risk in humans. For the treatment of dyestuffs, biodegradation has the advantages of economy, high efficiency, and environmental protection compared with traditional physical and chemical methods. Laccase is the best candidate for dye degradation because of its multiple substrates and pollution-free products. Methods Here, we modified the laccase gene of Bacillus licheniformis by error-prone PCR and site-directed mutagenesis and expressed in E. coli. The protein was purified by His-tagged protein purification kit. We tested the enzymatic properties of wild type and mutant laccase by single factor test, and further evaluated the decolorization ability of laccase to acid violet, alphazurine A, and methyl orange by spectrophotometry. Results Mutant laccase Lacep69and D500G were superior to wild type laccase in enzyme activity, stability, and decolorization ability. Moreover, the laccase D500G obtained by site-directed mutagenesis had higher enzyme activity in both, and the specific activity of the purified enzyme was as high as 426.13 U/mg. Also, D500G has a higher optimum temperature of 70 °C and temperature stability, while it has a more neutral pH 4.5 and pH stability. D500G had the maximum enzyme activity at a copper ion concentration of 12 mM. The results of decolorization experiments showed that D500G had a strong overall decolorization ability, with a lower decolorization rate of 18% for methyl orange and a higher decolorization rate of 78% for acid violet. Conclusion Compared with the wild type laccase, the enzyme activity of D500G was significantly increased. At the same time, it has obvious advantages in the decolorization effect of different dyes. Also, the advantages of temperature and pH stability increase its tolerance to the environment of dye wastewater.

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“…Thus, presently, the textile printing and dyeing industry is considered to be one of the most polluting industries. [1][2][3][4][5] The adsorption method has been widely used in the treatment of textile wastewater because of its simple operation, low cost and high efficiency. 6,7 Among the various absorbents, starch as a natural polymer has attracted much attention because of its advantages such as low price, high yield, easy access and high practicality.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a novel arginine-modified starch resin and its adsorption of dye wastewater

et al. 2020

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Synthetic organic dyes as contaminants of the aquatic environment and their implications for ecosystems: A review

Cited by 1,094 publications

References 122 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

Improving decolorization of dyes by laccase from Bacillus licheniformis by random and site-directed mutagenesis

Synthesis of a novel arginine-modified starch resin and its adsorption of dye wastewater

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