scholarly journals Photooxidation of a reactive azo-dye from the textile industry using UV/H2O2 technology: process optimization and kinetics

2005 ◽  
Vol 3 (1) ◽  
pp. 1-7 ◽  
Author(s):  
G. SUDARJANTO ◽  
B. KELLER-LEHMANN ◽  
J. KELLER
Keyword(s):  
Process Optimization ◽  
Textile Industry ◽  
Azo Dye ◽  
Technology Process

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.

scholarly journals Root Bacteria Recruited by Phragmites australis in Constructed Wetlands Have the Potential to Enhance Azo-Dye Phytodepuration

2019 ◽  
Vol 7 (10) ◽  
pp. 384 ◽  
Author(s):  
Valentina Riva ◽  
Francesca Mapelli ◽  
Evdokia Syranidou ◽  
Elena Crotti ◽  
Redouane Choukrallah ◽  
...  
Keyword(s):  
Plant Growth ◽  
Phragmites Australis ◽  
Textile Industry ◽  
Azo Dye ◽  
Growth Promotion ◽  
Wide Spectrum ◽  
Reactive Black 5 ◽  
Potential Use

The microbiome associated with plants used in phytodepuration systems can boost plant growth and services, especially in ecosystems dealing with recalcitrant compounds, hardly removed via traditional wastewater (WW) treatments, such as azo-dyes used in textile industry. In this context, we aimed to study the cultivable microbiome selected by Phragmites australis plants in a Constructed Wetland (CW) in Morocco, in order to obtain candidate inoculants for the phytodepuration of azo-dye contaminated WW. A collection of 152 rhizospheric and endophytic bacteria was established. The strains were phylogenetically identified and characterized for traits of interest in the phytodepuration context. All strains showed Plant Growth Promotion potential in vitro and 67% of them significantly improved the growth of a model plant in vivo compared to the non bacterized control plants. Moreover, most of the isolates were able to grow in presence of several model micropollutants typically found in WW, indicating their potential use in phytodepuration of a wide spectrum of effluents. The six most promising strains of the collection were tested in CW microcosms alone or as consortium: the consortium and two single inocula demonstrated to significantly increase the removal of the model azo-dye Reactive Black 5 compared to the non bacterized controls.

Active manganese oxide: a novel adsorbent for treatment of wastewater containing azo dye

2009 ◽  
Vol 60 (12) ◽  
pp. 3017-3024 ◽  
Author(s):  
S. Chakrabarti ◽  
B. K. Dutta ◽  
R. Apak
Keyword(s):  
Manganese Oxide ◽  
Congo Red ◽  
Textile Industry ◽  
Azo Dye ◽  
Sodium Sulphate ◽  
New Variety ◽  
Freundlich Isotherms ◽  
Adsorption Data ◽  
Equilibrium And Kinetics ◽  
Pseudo Second Order

A new variety of active manganese oxide was prepared, characterized, and tested for its potential of adsorbing Congo Red, a dis-azo dye, from aqueous solutions. Both equilibrium and kinetics were investigated over different values of process parameters such as temperature (25–45°C), adsorbent loading (0.4–0.6%), initial dye concentration (50–500 mg/L), presence of salts (sodium sulphate, 500 mg/L) and the oxygen content (MnOx, x = 1.2, 1.33 and 2) of the adsorbent. The equilibrium adsorption data were fitted to Langmuir and Freundlich isotherms. Langmuir adsorption capacity of the sorbent (x = 1.33) for Congo Red was 38.6 mg/g at room temperature which is substantially higher than those for commercial manganese dioxide, red mud, coir pith, activated carbon, and fly ash. The kinetic data were best interpreted using a pseudo-second order model. The results show that the active manganese oxide used in this work removes the dye by reversible adsorption and has the potential for practical use for remediation of textile industry effluents.

scholarly journals Bio-degradation of Azo Dye Acid Orange-10 by a New Isolate of Bacillus subtilis Isolated from Soil Sample around Textile Industry in South Karnataka

2021 ◽  
Vol 17 (4) ◽  
pp. 707-716
Author(s):  
Hema Gunti ◽  
Vyshali Venkatappa Maruthiramaih ◽  
Tippeswamy Boreddy Shivanandappa
Keyword(s):  
Bacillus Subtilis ◽  
Textile Industry ◽  
Azo Dye ◽  
Industrial Effluent ◽  
Inoculum Size ◽  
Soil Samples ◽  
Synthetic Dyes ◽  
Acid Orange ◽  
Acid Orange 10 ◽  
Static Conditions

Untreated effluents from the textile industry affect aquatic life irreversibly. Synthetic dyes not only change the color of water resources but also make them hazardous.The main objective of the study was to evaluate the decolorizing potential of a new isolate of Bacillus subtilis from soil samples contaminated with industrial effluent in and around textile industrial area in South Karnataka. This isolate of Bacillus subtilis has high decolorizing potential and took only 24 hrs for complete decolorization of acid orange-10 azo dye at 200ppm. Different parameters like temperature, pH, aeration, dye concentration and inoculum size were optimized for complete decolorization of Acid orange-10 azo dye by this isolate of Bacillus subtilis. The dye was completely decolorized at 400C within 24 hrs and it was capable of decolorizing 700 ppm dye in 72 hrs. Optimum pH was found to be 8.5 and maximum decolorization was achieved under static conditions. As the inoculum size increased, the time taken for complete decolorization of Acid orange-10 dye was decreased from 36 hrs at 1% to 16 hrs at 10% of inoculum size. The new isolate decolorizes 100 ppm of dye completely (i.e.100%) within 12hrs of incubation. The time taken for the complete decolorization increased with increase in the concentration of Acid orange-10 azo dye. In conclusion, the new isolate of Bacillus subtilis from soil samples contaminated with textile industrial effluent was found to be a potential candidate for decolorization of Acid orange-10 azo dye in textile effluents.

Study involving removal of azo dye Direct Orange 34 by adsorption in zeolite–clay system

2020 ◽  
Vol 98 (10) ◽  
pp. 609-615
Author(s):  
Mohuli Das ◽  
Sudipta Dasgupta ◽  
Marcos Antonio Klunk ◽  
Soyane Xavier Juceli Siqueira ◽  
Farid Chemale Junior ◽  
...  
Keyword(s):  
Textile Industry ◽  
Azo Dye ◽  
Dye Removal ◽  
Exchange Capacity ◽  
Toxic Agents ◽  
Wide Range ◽  
Clay System ◽  
Extensive Surface ◽  
High Concentrations ◽  
Dye Extraction

Recently, dyes have procured a wide range of application in the textile industry. These organic compounds possess toxic agents and act as water pollutants. Such dyes can be extracted by adsorption to prevent water pollution. The present work proposes removal of azo dye Direct Orange 34 from the aqueous solution using mixtures of sodalite zeolite (Si/Al ratio 2.5) and clay (vermiculite in 1.0, 2.5, 5.0 g). The methodology involves a system with different stages of separation, considering specified retention time (72, 48, 24, 12, 6 h) of adsorbate and dye concentrations (100, 50, 25, 10, 5 mg/L). The zeolite–vermiculite mixture has a high potential of dye removal due to extensive surface area and porosity with excellent cation exchange capacity conferring its adsorbent property. High concentrations (50 and 100 mg/L) and longer retention times than 48 h results in 50% removal of dyes, whereas a low concentration level (25, 10, 5 mg/L) increases the removal efficiency (74%). Henceforth, the experiment concluded that the zeolite–clay mixtures are capable of azo dye extraction.

Development of Techno-Feasible Mobile App for Process Optimization in Textile Industry

2021 ◽  
pp. 281-292
Author(s):  
Tushar Patil ◽  
Bhushan Chaudhari ◽  
Yatin Patale ◽  
Tushar Shinde ◽  
Rajendra Parsi ◽  
...  
Keyword(s):  
Process Optimization ◽  
Textile Industry ◽  
Mobile App

scholarly journals Photocatalytic Degradation of Azo Dye Reactive Violet 5 on Fe-Doped Titania Catalysts under Visible Light Irradiation

Catalysts ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 645 ◽  
Author(s):  
Antonio Zuorro ◽  
Roberto Lavecchia ◽  
Marika Michela Monaco ◽  
Giuseppina Iervolino ◽  
Vincenzo Vaiano
Keyword(s):  
Hydrogen Peroxide ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Textile Industry ◽  
Azo Dye ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Textile Effluents ◽  
Effects Of Ph ◽  
Doped Titania

The presence of azo dyes in textile effluents is an issue of major concern due to their potential impact on the environment and human health. In this study we investigate the photocatalytic degradation under visible light of Reactive Violet 5 (RV5), an azo dye widely used in the textile industry. A preliminary screening of different titania-based catalysts was carried out to identify the best candidate for RV5 removal. The selected catalyst was then tested in a stirred and aerated lab-scale reactor illuminated with a blue light-emitting diode (LED) source emitting in the wavelength range of 460–470 nm. The effects of pH, catalyst load, and hydrogen peroxide additions on the efficiency of dye removal were evaluated. Under the best conditions (pH 10, 3 g/L of catalyst, and 60 mM hydrogen peroxide), the dye solution was completely decolorized in about 2 h. Overall, the results obtained suggest that the proposed process may represent a suitable method for the removal of RV5 from textile effluents.

Solution for Industrial Process Optimization

2015 ◽  
Vol 809-810 ◽  
pp. 1348-1353
Author(s):  
Alexandru Popa ◽  
Dan Ovidiu Glăvan ◽  
Adina Bucevschi ◽  
Doina Mortoiu ◽  
Marcelo Calvete Gaspar
Keyword(s):  
Technological Process ◽  
Process Optimization ◽  
Textile Industry ◽  
Industrial Process ◽  
The Other ◽  
Process Optimisation ◽  
High Quality ◽  
Yarn Quality ◽  
Ring Frame ◽  
Spinning Process

The ring frame is the last machine in the technological process to obtain a high quality yarn. The existing machines in textile industry of our country are equipped with drafting assembly suitable for a series of adjustments. Besides this, the ring frames ensure high draft. The efficiency of this high drafts can be justified through their influence on ring frame production. Another technologic parameter that is related on one hand to the yarn quality and on the other hand to the production is the spindles speed. In this paper it is presented a solution for spinning process optimisation for a yarn Nm 52 made by 45% wool and 55% polyester.

scholarly journals Degradation of Reactive Black 5 dye by a newly isolated bacterium Pseudomonas entomophila BS1

2016 ◽  
Vol 62 (3) ◽  
pp. 220-232 ◽  
Author(s):  
Sana Khan ◽  
Abdul Malik
Keyword(s):  
Textile Industry ◽  
Azo Dye ◽  
Degradation Pathway ◽  
Mass Spectrometry Analysis ◽  
Gas Chromatography Mass Spectrometry ◽  
Flavin Mononucleotide ◽  
Reactive Black 5 ◽  
Spectrometry Analysis ◽  
Rdna Sequencing ◽  
Static Conditions

The textile and dye industries are considered as one of the major sources of environmental pollution. The present study was conducted to investigate the degradation of the azo dye Reactive Black 5 (RB 5) using a bacterium isolated from soil samples collected around a textile industry. The bacterial strain BS1 capable of degrading RB 5 was isolated and identified as Pseudomonas entomophila on the basis of 16S rDNA sequencing. The effects of different parameters on the degradation of RB 5 were studied to find out the optimal conditions required for maximum degradation, which was 93% after 120 h of incubation. Static conditions with pH in the range of 5–9 and a temperature of 37 °C were found to be optimum for degrading RB 5. Enzyme assays demonstrated that P. entomophila possessed azoreductase, which played an important role in degradation. The enzyme was dependent on flavin mononucleotide and NADH for its activity. Furthermore, a possible degradation pathway of the dye was proposed through gas chromatography – mass spectrometry analysis, which revealed that the metabolic products were naphthalene-1,2-diamine and 4-(methylsulfonyl) aniline. Thus the ability of this indigenous bacterial isolate for simultaneous decolorization and degradation of the azo dye signifies its potential application for treatment of industrial wastewaters containing azo dyes.

scholarly journals Process optimization of preparation of pentoxifylline – extended release tablets

Pharmacia ◽  
2019 ◽  
Vol 66 (2) ◽  
pp. 45-48
Author(s):  
Stanislav Tzankov ◽  
Borislav Tzankov
Keyword(s):  
Drug Release ◽  
Process Optimization ◽  
Extended Release ◽  
Qualitative Composition ◽  
Release Process ◽  
Peg 6000 ◽  
Compressibility Index ◽  
Technology Process

The possibilities for correction of the rate of drug release by minimal changes in the technology process and by maintaining the quantitative and qualitative composition of the product pentoxifylline – extended release tablets were explored. Correction was made by addition of different quantity of HPMC (4000 cPs) to a granulating solution of PEG 6000. The main characteristics of the granules (compressibility index and density) were established. The swelling of the hydrogel tablets in water was determined in order more information on the release process to be obtained. Dissolution profiles of produced tablets were determined.

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