scholarly journals Decolorization of the benzidine-based azo dye Congo red by the new strain Shewanella xiamenensis G5-03

2022 ◽  
Vol 82 ◽  
Author(s):  
E. R. Silva ◽  
E. L. Dall’Oglio ◽  
L. G. Vasconcelos ◽  
E. B. Morais
Keyword(s):  
Azo Dyes ◽  
Incubation Time ◽  
Congo Red ◽  
Azo Dye ◽  
Biological Treatment ◽  
Static Condition ◽  
Dye Decolorization ◽  
Synthetic Wastewater ◽  
Bond Breakage ◽  
Decolorization Efficiency

Abstract Shewanella xiamenensis G5-03 was observed to decolorize the azo dye Congo red in synthetic wastewater. The influence of some factors on the dye decolorization efficiency was evaluated. The optimal decolorization conditions were temperature 30-35 °C, pH 10.0, incubation time 10 h, and static condition. The kinetic of Congo red decolorization fitted to the Michaelis–Menten model (Vmax = 111.11 mg L-1 h-1 and Km = 448.3 mg L-1). The bacterium was also able to degrade benzidine, a product of azo bond breakage of the Congo red, which contributed to reduce the phytotoxicity. The ability of S. xiamenensis G5-03 for simultaneous decolorization and degradation of Congo red shows its potential application for the biological treatment of wastewaters containing azo dyes.

Biodegradation of selected azo dyes under methanogenic conditions

1997 ◽  
Vol 36 (6-7) ◽  
pp. 65-72 ◽  
Author(s):  
Elías Razo-Flores ◽  
Maurice Luijten ◽  
Brian Donlon ◽  
Gatze Lettinga ◽  
Jim Field
Keyword(s):  
Azo Dyes ◽  
Textile Industry ◽  
Azo Dye ◽  
Biological Treatment ◽  
Present Report ◽  
Anaerobic Bacteria ◽  
Aminosalicylic Acid ◽  
Batch Experiments ◽  
Azo Reduction ◽  
Uasb Reactors

Biological treatment of wastewaters discharged by the textile industry could potentially be problematic due to the high toxicity and recalcitrance of the commonly-used azo dye compounds. In the present report, the fate of two azo dyes under methanogenic conditions was studied. Mordant Orange 1 (MO1) and Azodisalicylate (ADS) were completely reduced and decolorised in continuous UASB reactors in the presence of cosubstrates. In the MO1 reactor, both 5-aminosalicylic acid (5-ASA) and 1,4-phenylenediamine were identified as products of azo cleavage. After long adaptation periods, 5-ASA was detected at trace levels, indicating further mineralization. ADS, a pharmaceutical azo dye constructed from two 5-ASA units, was completely mineralized even in the absence of cosubstrate, indicating that the metabolism of 5-ASA could provide the reducing equivalents needed for the azo reduction. Batch experiments confirmed the ADS mineralization. These results demonstrate that some azo dyes could serve as a carbon, energy, and nitrogen source for anaerobic bacteria.

Degradation of Azo Dyes by the Reduction and Oxidation with Nano Sized Zero Valented Iron

2007 ◽  
Vol 544-545 ◽  
pp. 705-708 ◽  
Author(s):  
B.H. Moon ◽  
Y.B. Park ◽  
Sung Su Kim ◽  
Gyu Tae Seo ◽  
T.S. Lee ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Azo Dyes ◽  
Efficient Method ◽  
Azo Dye ◽  
Zero Valent Iron ◽  
Optimum Dosage ◽  
Toc Removal ◽  
Decolorization Efficiency ◽  
Reduction And Oxidation

The objective of this study is to investigate the efficient method to maximize both color and TOC removal of the azo dye solution by reduction and oxidation with a laboratory synthesized nano-sized zero valent iron (nZVI). The decolorization efficiency increased with the decrease of pH and increase of zero valent iron dosage. The optimum dosage of nano-sized zero-valent iron was 20mg/L at pH 3. The surface normalized constant of nZVI was higher than those reported for the discoloring of azo dye with other ZVIs. The sequential dose of nZVI/H2O2 remove color and TOC more effectively than the simultaneous dose. Pre-reduction by nZVI could convert azo dye to products whose oxidation is more degradable and therefore enhances the removal efficiency.

Photochemical Degradation of Azo Dyes in the Presence of Hydrogen Peroxide and Hematite under Visible Light Irradiation: Surface Complex Forming and Reaction Mechanism

2011 ◽  
Vol 287-290 ◽  
pp. 1612-1619 ◽  
Author(s):  
Yu Chao Tang ◽  
Xian Huai Huang ◽  
Han Qing Yu ◽  
Wei Hua Li ◽  
Chang Nian Wu
Keyword(s):  
Azo Dyes ◽  
Active Site ◽  
Azo Dye ◽  
Critical Factor ◽  
Chemical Adsorption ◽  
Photochemical Degradation ◽  
Surface Complex ◽  
Degradation Mechanisms ◽  
Decolorization Efficiency ◽  
Visible Irradiation

The photochemical degradation mechanisms of an azo dye Direct Red 4BS and Methyl Orange on hematite in the presence of H2O2 were investigated. The decolorization of azo dyes was attributed to the forming surface complex between specific bond of the dyes and hematite, which facilitate the electron transfer from hematite to azo bond. No mineralization of azo dyes occurred in the presence of visible irradiation, only chromogenic group destroyed in the photo-chemical reaction process. Surface complex between azo dyes and hematite will be destroyed under alkaline solution which suggested the active site or the formed surface complex had been destroyed by OH–. Chemical adsorption of the azo dyes on hematite was critical factor which affect the decolorization efficiency of the photoreaction.

scholarly journals Enhancement on the Microbial Extracellular Electron Transfers by Modified Lignin Materials: Application on Decolorization of Azo Dye

2021 ◽  
Author(s):  
Rong-ping Chen ◽  
Jia-li Cai ◽  
Qing Li ◽  
Xin-yuan Wei ◽  
Cheng-hao Gan ◽  
...  
Keyword(s):  
Azo Dyes ◽  
Azo Dye ◽  
Anaerobic Respiration ◽  
Electrochemical Performances ◽  
Oh Radicals ◽  
The Novel ◽  
Remarkable Effect ◽  
Decolorization Efficiency ◽  
Modified Lignin ◽  
Electron Transfers

Abstract Background: Extracellular electron transfers (EETs) are mainly involved in anaerobic respiration of quinone-respiring strains, which is applicable in many fields, such as microbiological fuel cell, bio-hydrogen production, anoxic denitrification, and bio-reduction of azo dyes. However, this kind of instinctive function of microbes was nonspecific and low efficient, which needed to be improved by addition of exogenous redox mediators (RMs). In this work, vanillin, syringaldehyde and p-hydroxybenzaldehyde, as the precursors of lignin, were functionally modified to RMs in effort to accelerate the bio-reduction azo dyes.Results: The results showed that the decolorization efficiency of MO motivated by modified vanillin were increased from 20% to 95% in less than 12 h. And the modified syringaldehyde was increased to 85% in 24h. According to GC-MS, the modified products of vanillin and syringaldehyde were mainly kinds of phenols, ketones and quinones. The RMs exhibited better electrochemical performances by CV measurement and the •OH radicals were found according to EPR. Under saline condition, the strain, in the presence of RMs, still exhibited a high and stable removal efficiency to MO.Conclusions: The novel RMs of biodegradation to azo dyes were prepared from lignin monomers. The RMs based on bio-materials are environment-friendly and have a remarkable effect in biodegradation of azo dyes. This work may provide a new route for the functional utilization of lignin-resource and a theoretical guidance for efficient biodegradation of azo dye wastewater.

Evaluation of Light Irradiation on Decolorization of Azo Dyes by Tsukamurella sp. J8025

2011 ◽  
Vol 145 ◽  
pp. 304-308 ◽  
Author(s):  
Wen Tung Wu ◽  
Ming Der Jean
Keyword(s):  
Culture Medium ◽  
Static Condition ◽  
Dye Decolorization ◽  
Luria Bertani ◽  
Light Irradiation ◽  
Malt Extract ◽  
Dye Wastewater ◽  
Mercury Lamp ◽  
Decolorization Efficiency ◽  
High Concentrations

In the previous study, the dye decolorization was investigated byTsukamurellasp. J8025 under the static condition at 30°C. The object of this study was to evaluate the influence of light irradiation with 15W low-pressure mercury lamp on dye decolorization. Three kinds of common culture medium Luria-Bertani (LB), Tryptic Soy Broth (TSB), and Yeast extract-Malt Extract (YEME) were used in this study. Strain J8025 was cultivated in different media added with methyl orange, and the rate of color removal was determined by measuring the absorbance at specific wavelengths. The experiments proved the decolorization efficiency after 48h under light irradiation in LB medium was up to 40%, that in TSB medium was up to 50%, and that in YEME medium was up to 68%, respectively. The decolorization process needed glucose as an energy source to support the bacterial growth and promote the decolorization rate. Due to the salt contained in the dye-wastewater, the effect of salt was investigated. The results showed nearly 98% color was removed after 48 h in the presence of 1% NaCl under light irradiation, but the decolorization was inhibited by high concentrations of salt. The results indicated a strain J8025 coupling with the light irradiation could be potentially used to improve the dye decolorization.

scholarly journals Degradation and Detoxification of Congo Red azo dye by Immobilized Laccase of Streptomyces sviceus

2021 ◽  
Author(s):  
Bhoodevi Chakravarthi ◽  
Vani Mathkala ◽  
Uma Maheswari Devi Palempalli
Keyword(s):  
Liquid Chromatography ◽  
Molecular Mechanism ◽  
Azo Dyes ◽  
Congo Red ◽  
Azo Dye ◽  
Molecular Size ◽  
Gas Chromatography Mass Spectrometry ◽  
Marine Actinobacteria ◽  
Immobilized Laccase ◽  
Laccase Enzyme

The discharge of textile effluents enriched with reactive azo dyes is of critical importance owing to inability of the dyes to degrade in waste water and their carcinogenic, mutagenic effects to various organisms. This study initiated based on the need to gaze into molecular mechanism of marine bacterial bioremediation process to develop strategies for the decolorization and detoxification of the synthetic azo dyes. The experimental work carried out to explore decolorization and degradation efficacy of laccase derived from marine actinobacteria, Streptomyces sviceus by choosing Congo red-21 as model azo dye. The extracellular production of laccase was confirmed with plate assay in medium supplemented with ABTS as substrate. Laccase was purified to homogeneity from 72hrs culture of Streptomyces sviceus by Fast performance liquid chromatography and the molecular size of laccase was noticed as 60 kDa. The purified laccase was immobilized with an efficiency of 82% by Calcium alginate method. The crude, purified and immobilized forms of the laccase enzyme was used to decolorize the Congo red-21. Crude laccase enzyme showed 69% of decolorization of Congo red-21 after 48h where as purified and immobilized laccase represented 78% and 92% of colour removal after 24 h respectively. Fourier-transform infrared spectroscopy, High Performance Liquid Chromatography and Gas chromatography–mass spectrometry were used to unravel the molecular mechanism of dye detoxification and also identify nontoxic products released from Congo Red-21 upon administration with immobilized laccase. Based on GC-MS data, it may deduce that immobilized laccase of Streptomyces sviceus cleaves the Congo red-21 dye followed by oxidative cleavage, desulfonation, deamination, demethylation process.

Decolorization Effect of Mycelium Pellet on Saline Azo Dye Wastewater

2011 ◽  
Vol 130-134 ◽  
pp. 3784-3787
Author(s):  
Jian Zhong Zeng ◽  
Jun Yue Lin ◽  
Song Zhou ◽  
Xiu Guang Yi ◽  
Shi Sheng Zeng
Keyword(s):  
Azo Dyes ◽  
Bacterial Strain ◽  
Azo Dye ◽  
Dye Decolorization ◽  
Dye Wastewater ◽  
Extracellular Products ◽  
Microscopic Features ◽  
Microbial Flocculation

A fungus with efficient dye decolorization and that generates a microbial flocculation agent was isolated from a wastewater environment and screened. This bacterial strain imposed a significant decolorization effect on azo dyes. On the basis of morphological and microscopic features, the fungus was identified and named A-6. The results show that the decolorization process of the fungus exhibited two types of actions: adsorption decolorization of mycelium and flocculated decolorization of extracellular products in the dyes. The decolorization ratio reached 99.20%

scholarly journals Isolation and Characterization ofParacoccussp. GSM2 Capable of Degrading Textile Azo Dye Reactive Violet 5

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Mallikarjun C. Bheemaraddi ◽  
Santosh Patil ◽  
Channappa T. Shivannavar ◽  
Subhashchandra M. Gaddad
Keyword(s):  
Azo Dyes ◽  
Textile Industry ◽  
Azo Dye ◽  
Static Condition ◽  
Sole Source ◽  
Textile Mill ◽  
Visible Absorption ◽  
Isolation And Characterization ◽  
Before And After ◽  
Ft Ir

A potential bacterial strain GSM2, capable of degrading an azo dye Reactive Violet 5 as a sole source of carbon, was isolated from textile mill effluent from Solapur, India. The 16S rDNA sequence and phenotypic characteristics indicated an isolated organism asParacoccussp. GSM2. This strain exhibited complete decolorization of Reactive Violet 5 (100 mg/L) within 16 h, while maximally it could decolorize 800 mg/L of dye within 38 h with 73% decolorization under static condition. For color removal, the most suitable pH and temperature were pH 6.0–9.0 and 25–40°C, respectively. The isolate was able to decolorize more than 70% of five structurally different azo dyes within 38 h. The isolate is salt tolerant as it can bring out more than 90% decolorization up to a salt concentration of 2% (w/v). UV-Visible absorption spectra before and after decolorization suggested that decolorization was due to biodegradation and was further confirmed by FT-IR spectroscopy. Overall results indicate the effectiveness of the strain GSM2 explored for the treatment of textile industry effluents containing various azo dyes. To our knowledge, this could be the first report on biodegradation of Reactive Violet 5 byParacoccussp. GSM2.

Biosorption of Congo Red from aqueous solution by Bacillus weihenstephanensis RI12; effect of SPB1 biosurfactant addition on biodecolorization potency

2015 ◽  
Vol 72 (6) ◽  
pp. 865-874 ◽  
Author(s):  
Inès Mnif ◽  
Raouia Fendri ◽  
Dhouha Ghribi
Keyword(s):  
Congo Red ◽  
Azo Dye ◽  
Ph Value ◽  
Energy Costs ◽  
Time Saving ◽  
Bacillus Weihenstephanensis ◽  
Decolorization Efficiency ◽  
Higher Doses ◽  
Adsorption Phenomena ◽  
Microbial Surfactant

Bacillus weihenstephanensis RI12, isolated from hydrocarbon contaminated soil, was assessed for Congo Red bio-treatment potency. Results suggested the potential of this bacterium for use in effective treatment of Congo Red contaminated wastewaters under shaking conditions at acidic and neutral pH value. The strain could tolerate higher doses of dyes as it could decolorize up to 1,000 mg/l of Congo Red. When used as microbial surfactant to enhance Congo Red biodecolorization, Bacillus subtilis SPB1-derived lipopeptide accelerated the decolorization rate and maximized the decolorization efficiency at an optimal concentration of biosurfactant of about 0.075%. Studies ensured that Congo Red removal by this strain could be due to an adsorption phenomena. Germination potencies of tomato seeds using the treated dyes under different conditions showed the efficient biotreatment of the azo dye Congo Red especially with the addition of SPB1 biosurfactant. To conclude, the addition of SPB1 bioemulsifier reduced energy costs by reducing the effective decolorization period; the biosurfactant stimulated bacterial decolorization method may provide a highly efficient, inexpensive and time-saving procedure in the treatment of textile effluents.

Pretreatment of azo dyes using ozone

1997 ◽  
Vol 36 (2-3) ◽  
pp. 155-163 ◽  
Author(s):  
S. Liakou ◽  
M. Kornaros ◽  
G. Lyberatos
Keyword(s):  
Mathematical Model ◽  
Azo Dyes ◽  
Textile Industry ◽  
Azo Dye ◽  
Biological Treatment ◽  
Organic Dyes ◽  
Industrial Processes ◽  
Orange Ii ◽  
Batch Experiments ◽  
Kinetics Of

Wastewaters produced in textile industrial processes contain organic dyes which are not easily amenable to biological treatment. Pretreatment with ozone is a promising method for oxidation of those dyes to more degradable compounds. The aim of this work is to assess the oxidation kinetics of a specific azo dye used in the textile industry, Orange II. Batch experiments were conducted in order to elucidate the oxidation route of the dye. Oxalate, formate and benzenesulfonate are found to be the oxidation intermediate compounds. A mathematical model which describes the dye elimination, the COD and BOD5 variation, the amount of ozone reacted and the time evolution of the intermediate compounds has been developed.

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