Biological decolorization of azo dyes from textile wastewater effluent by Aspergillus niger

The objectives of this work were to carry out a complete characterization of textile wastewater, resulting from a textile unit located in the Marrakesh region. A physico-chemical characterization has been performed, focused on organic and toxicological aspects. The cladoceran Daphnia magna was used as the sensor organism and lethal concentration as a criterion to measure the toxicity of textile wastewater. The physico-chemical and toxicological status of a local textile effluent showed considerable values limitation, when compared to the European Union standard limit and Moroccan guide level and other studies. In view of those characteristics, the wastewater effluent from the textile industry should be considered to be treated before discharge to the environment.

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Congo Red Decolorization and Detoxification by Aspergillus niger: Removal Mechanisms and Dye Degradation Pathway

BioMed Research International ◽

10.1155/2018/3049686 ◽

2018 ◽

Vol 2018 ◽

pp. 1-9 ◽

Cited By ~ 19

Author(s):

Nedra Asses ◽

Lamia Ayed ◽

Neila Hkiri ◽

Moktar Hamdi

Keyword(s):

Molecular Structure ◽

Aspergillus Niger ◽

Azo Dyes ◽

Lignin Peroxidase ◽

Congo Red ◽

Manganese Peroxidase ◽

Dye Degradation ◽

Degradation Pathway ◽

Effects Of Ph ◽

Maximum Decolorization

Congo red is one of the best known and used azo dyes which has two azo bonds (-N=N-) chromophore in its molecular structure. Its structural stability makes it highly toxic and resistant to biodegradation. The objective of this study was to assess the congo red biodegradation and detoxification by Aspergillus niger. The effects of pH, initial dye concentration, temperature, and shaking speed on the decolorization rate and enzymes production were studied. The maximum decolorization was correlated with lignin peroxidase and manganese peroxidase production. Above 97% were obtained when 2 g mycelia were incubated at pH 5, in presence of 200 mg/L of dye during 6 days at 28°C and under 120 to 150 rpm shaking speed. The degraded metabolites were characterized by using LC-MS/MS analyses and the biodegradation mechanism was also studied. Congo red bioconversion formed degradation metabolites mainly by peroxidases activities, i.e., the sodium naphthalene sulfonate (m/z = 227) and the cycloheptadienylium (m/z = 91). Phytotoxicity and microtoxicity tests confirmed that degradation metabolites were less toxic than original dye.

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Chemical and Biological Treatment of Dyes

Impact of Textile Dyes on Public Health and the Environment - Advances in Human Services and Public Health ◽

10.4018/978-1-7998-0311-9.ch009 ◽

2020 ◽

pp. 170-204

Author(s):

Kiran Meghwal ◽

Reema Agrawal ◽

Srishti Kumawat ◽

Nirmala Kumari Jangid ◽

Chetna Ameta

Keyword(s):

Azo Dyes ◽

Aquatic Environment ◽

Industrial Wastewater ◽

Biological Treatment ◽

New Technologies ◽

Aquatic Organisms ◽

Textile Wastewater ◽

Important Concern ◽

Industrial Needs ◽

Living Being

Life of living or non-living being depends on water; in short, water is life. But these days, with the growing industrialization, it is spoiling a lot. Wastewater contains contaminants like acids, bases, toxic organic and inorganic dissolved solids, and colors. Out of them, the most undesirable are colors caused mainly by dyes. Color and other compounds present in water are always not desirable for domestic or industrial needs. The wastes of dyes are predominant amongst all the complex industrial wastewater. This water is dark in color and highly toxic, blocking the sunlight and affecting the ecosystem. Among all the dyes, azo dyes contribute to commercial dyes used widely in textile, plastic, leather, and paper industries as additives. The removal and degradation of azo dyes in aquatic environment is important because they are highly toxic to aquatic organisms. For every industry, clean technology has become an important concern. In this chapter, the authors discuss about existing processes as well as promising new technologies for textile wastewater decolorisation.

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In situ Decolorization Monitoring of Textile Dyes for an Optimized UV-LED/TiO2 Reactor

Catalysts ◽

10.3390/catal9080669 ◽

2019 ◽

Vol 9 (8) ◽

pp. 669 ◽

Cited By ~ 3

Author(s):

Tecilli Tapia-Tlatelpa ◽

Jose Trull ◽

Luis Romeral

Keyword(s):

Light Scattering ◽

Azo Dyes ◽

Online Monitoring ◽

Textile Wastewater ◽

Heterogeneous Photocatalysis ◽

Fixed Rate ◽

Uv Led ◽

Procion Yellow ◽

Remazol Black

Heterogeneous photocatalysis, using photocatalysts in suspension to eliminate diverse contaminants, including textile wastewater, has several advantages. Nevertheless, current absorbance and decolorization measurements imply sample acquisition by extraction at a fixed rate with consequent photocatalyst removal. This study presents online monitoring for the decolorization of six azo dyes, Orange PX-2R (OP2), Remazol Black B133 (RB), Procion Crimson H-EXL (PC), Procion Navy H-EXL (PN), Procion Blue H-EXL (PB), and Procion Yellow H-EXL (PY), analyzing the spectrum measured in situ by using the light scattering provided by the photocatalyst in suspension. The results obtained have corroborated the feasibility of obtaining absorbance and decolorization measurements, avoiding disturbances in the process due to a decrease in the volume in the reactor.

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Application of polyaniline as an efficient and novel adsorbent for azo dyes removal from textile wastewaters

Chemical Papers ◽

10.2478/s11696-010-0083-x ◽

2011 ◽

Vol 65 (1) ◽

pp. 1-8 ◽

Cited By ~ 38

Author(s):

Reza Ansari ◽

Zahra Mosayebzadeh

Keyword(s):

Aqueous Solutions ◽

Azo Dyes ◽

Azo Dye ◽

High Performance ◽

Textile Wastewater ◽

Chemical Regeneration ◽

Textile Wastewater Treatment ◽

High Performance Application ◽

Langmuir And Freundlich Models ◽

Granulated Activated Carbon

AbstractIn this work, application of polyaniline coated onto wood sawdust (PAni/SD) for the removal of methyl orange (MO) as a typical azo dye from aqueous solutions is introduced. The effects of some important parameters such as pH, initial concentration, sorbent dosage, and contact time on the uptake of MO solution were also investigated. In order to get a better comparison, adsorption experiments were also carried out using commercial grade of granulated activated carbon (GAC) and sawdust without coating (SD) at the same time. It was found that PAni/SD can be used to remove azo dyes such as MO from aqueous solutions very efficiently. Experimental data were analyzed by the Langmuir and Freundlich models of adsorption. Kinetic parameters for the adsorption of MO dyes for the selected adsorbents are also reported. In order to study the possibility of desorption for frequent application, chemical regeneration of the used adsorbents was also investigated. Desorption or recovery of dye and regeneration of adsorbent (PAni/SD) was found to be quite possible and of high performance. Application of modified sawdust with polyaniline for the removal of azo dye is very promising for textile wastewater treatment.

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Membrane photoreactor treatment of 1,4-dioxane-containing textile wastewater effluent: Performance, modeling, and fouling control

Water Research ◽

10.1016/j.watres.2015.05.017 ◽

2015 ◽

Vol 86 ◽

pp. 58-65 ◽

Cited By ~ 30

Author(s):

Ki-Chang Lee ◽

Ha-Ju Beak ◽

Kwang-Ho Choo

Keyword(s):

Performance Modeling ◽

Textile Wastewater ◽

Wastewater Effluent ◽

Fouling Control

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Bioremediation of wastewater containing azo dyes through sequential anaerobic–aerobic bioreactor system and its biodiversity

Environmental Reviews ◽

10.1139/a10-001 ◽

2010 ◽

Vol 18 (NA) ◽

pp. 21-36 ◽

Cited By ~ 17

Author(s):

Nishant Dafale ◽

Satish Wate ◽

Sudhir Meshram ◽

Nageswara Rao Neti

Keyword(s):

Azo Dyes ◽

Textile Wastewater ◽

Anaerobic Treatment ◽

Microbial Consortia ◽

Treatment Unit ◽

Logical Concept ◽

Wide Range ◽

Bioreactor System ◽

Using Data ◽

Complete Mineralization

Wide range of dyes and dyestuffs used in textile manufacturing are xenobiotic compounds and attract stricter to strict environmental regulations. The ability of microbial consortia to decolorize and metabolize dyes has long been known, and the use of bioremediation based technologies for treating textile wastewater has attracted interest. These dyes are decolorized by microbial consortia but technologies for their complete mineralization are still not developed. The most logical concept for the removal of azo dyes in biological wastewater treatment systems is based on anaerobic treatment, for the reductive decolorization, in combination with aerobic treatment, for the degradation of the by-products (aromatic amines) generated in the anaerobic bioreactor. Several research and review articles were published on anaerobic decolorization; however, research on complete mineralization of dyes through sequential anaerobic–aerobic bioreactors has received greater attention recently. Bioremediation through sequential anaerobic–aerobic bioreactor system has been reviewed in this article with critical appraisal using data generated through our experiments. While reviewing this work, we realized the importance of microbial diversity in a treatment unit to better understand the functional status to enhance the mineralization activity of the bioreactor.

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