Azo-dye degradation in an anaerobic-aerobic treatment system operating on simulated textile effluent

2000 ◽  
Vol 53 (2) ◽  
pp. 249-254 ◽  
Author(s):  
C. O'Neill ◽  
A. Lopez ◽  
S. Esteves ◽  
F. R. Hawkes ◽  
D. L. Hawkes ◽  
...  
Keyword(s):  
Azo Dye ◽  
Dye Degradation ◽  
Treatment System ◽  
Textile Effluent ◽  
Aerobic Treatment ◽  
System Operating

Use of a sequencing batch biofilter for degradation of azo dyes (acids and bases)

2000 ◽  
Vol 42 (5-6) ◽  
pp. 329-336 ◽  
Author(s):  
M. Quezada ◽  
I. Linares ◽  
G. Buitrón
Keyword(s):  
Azo Dyes ◽  
Azo Dye ◽  
Degradation Rate ◽  
Removal Rate ◽  
Textile Effluent ◽  
Colour Removal ◽  
Substrate Degradation ◽  
Acids And Bases ◽  
Removal Efficiencies ◽  
Basic Red 46

The degradation of azo dyes in an aerobic biofilter operated in an SBR system was studied. The azo dyes studied were Acid Red 151 and a textile effluent containing basic dyes (Basic Blue 41, Basic Red 46 and 16 and Basic Yellow 28 and 19). In the case of Acid Red 151 a maximal substrate degradation rate of 288 mg AR 151/lliquid·d was obtained and degradation efficiencies were between 60 and 99%. Mineralization studies showed that 73% (as carbon) of the initial azo dye was transformed to CO2 by the consortia. The textile effluent was efficiently biodegraded by the reactor. A maximal removal rate of 2.3 kg COD/lliquid·d was obtained with removal efficiencies (as COD) varying from 76 to 97%. In all the cycles the system presented 80% of colour removal.

Degradation of an Azo Dye by Fenton Type Processes Assisted with UV Irradiation

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Natalija Koprivanac ◽  
Dinko Vujevic
Keyword(s):  
Uv Irradiation ◽  
Azo Dye ◽  
Dye Degradation ◽  
Degradation Products ◽  
Batch Reactor ◽  
Process Efficiency ◽  
Molar Ratio ◽  
Synthetic Dyes ◽  
Ambient Conditions ◽  
Treatment Methods

Organic synthetic dyes are widely produced and used today. Significant losses of organic and inorganic content occurs during the manufacturing and application of dyes and its discharge in the effluent presents a threat to the eco-systems due to general toxicity and resistance to destruction by biological treatment methods. Particularly azo dyes are of special environmental concern due to their degradation products such as aromatic amines, which are considered highly carcinogenic. So, dyes have to be removed from coloured wastewater before discharge. However, traditional treatment methods (adsorption, coagulation/flocculation) mainly transfer the contaminants from wastewater to secondary waste. Therefore, advanced oxidation processes seem to be sustainable and clean technology to decolorize and minimize organic dyes content from wastewater. In this paper, degradation of an azo dye C.I. Direct Orange 39 (DO39) using Fenton type processes (Fe2+/H2O2, Fe3+/H2O2and Fe0/H2O2) has been performed. The molar ratio of Fenton’s type reagents has been varied in the range of 1 : 5 up to 1 : 50 at 0.5 and 1.0 mM concentrations of iron salts and iron powder. Experiments have been conducted for two hours in a batch reactor with magnetic stirring, ambient conditions and pH 3. The process efficiency and formation of degradation by-products have been determined on the basis of results obtained by UV/VIS spectrophotometric, total organic carbon (TOC) and high performance liquid chromatography (HPLC) analyses. The optimal Fenton and Fenton ``like" processes parameters have been applied in the photo reactor, too. It has been observed that simultaneous utilization of UV irradiation with Fenton's and Fenton ``like" reagents increases the degradation of DO39 dye. Degradation of the dye in dilute aqueous solution follows pseudo-first order kinetics. The maximal decolourization of 20 mg L-1 DO39 in water of 93.2% and TOC degradation of 76.9% were obtained using Fe3+/H2O2= 1 : 5 molar ratio. The results indicate that the treatment of DO39 dye wastewater with UV/Fe3 +/H2O2 system was found to be the most efficient.

scholarly journals Azo dye degradation by Phanerochaete chrysosporium in the medium enriched with nitrogen in the presence of primary co-substrate

2013 ◽  
Vol 56 (5) ◽  
pp. 867-874 ◽  
Author(s):  
Marcus Vinicius Freire Andrade ◽  
Karla Mayara Lima da Silva ◽  
João Paulo da Silva Siqueira ◽  
Carlos Ronald Pessoa Wanderley ◽  
Rinaldo dos Santos Araújo ◽  
...  
Keyword(s):  
Phanerochaete Chrysosporium ◽  
Azo Dye ◽  
Dye Degradation

Fe-based metallic glass catalyst with nanoporous surface for azo dye degradation

Chemosphere ◽  
2017 ◽  
Vol 174 ◽  
pp. 76-81 ◽  
Author(s):  
Z. Deng ◽  
X.H. Zhang ◽  
K.C. Chan ◽  
L. Liu ◽  
T. Li
Keyword(s):  
Metallic Glass ◽  
Azo Dye ◽  
Dye Degradation ◽  
Nanoporous Surface

Role of Enzymes From Microbes in the Treatment of Recalcitrant From Industries

2018 ◽  
pp. 395-420
Author(s):  
Veena Gayathri Krishnaswamy
Keyword(s):  
Fresh Water ◽  
Azo Dyes ◽  
Azo Dye ◽  
Dye Degradation ◽  
Anthropogenic Activities ◽  
Bacterial Degradation ◽  
Wide Range ◽  
Pharmaceutical Industries ◽  
Degradation Of Azo Dye

The limited availability of fresh water is a global crisis. The growing consumption of fresh water due to anthropogenic activities has taken its toll on available water resources. Unfortunately, water bodies are still used as sinks for waste water from domestic and industrial sources. Azo dyes account for the majority of all dye stuffs, produced because they are extensively used in the textile, paper, food, leather, cosmetics, and pharmaceutical industries. Bacterial degradation of azo dyes under certain environmental conditions has gained momentum as a method of treatment, as these are inexpensive, eco-friendly, and can be applied to wide range of such complex dyes. The enzymatic approach has attracted much interest with regard to degradation of azo dyes from wastewater. The oxido-reductive enzymes are responsible for generating highly reactive free radicals that undergo complex series of spontaneous cleavage reactions, due to the susceptibility of enzymes to inactivation in the presence of the other chemicals. The oxidoreductive enzymes, such as lignin peroxidase, laccases, tyrosinase, azoreductase, riboflavin reductive, polyphenol oxidase, and aminopyrine n-demethylase, have been mainly utilized in the bacterial degradation of azo dye. Along with the reductive enzymes, some investigators have demonstrated the involvement in some other enzymes, such as Lignin peroxides and other enzymes. This chapter reviews the importance of enzymes in dye degradation.

Comparative Analysis of Bioremediation Potential of Adapted and Non-Adapted Fungi on Azo Dye Containing Textile Effluent

2011 ◽  
Vol 14 (11) ◽  
pp. 610-618 ◽  
Author(s):  
R. Rajendran ◽  
S. Karthik Sundaram ◽  
P. Prabhavath ◽  
B.V. Sridevi ◽  
V. Gopi
Keyword(s):  
Comparative Analysis ◽  
Azo Dye ◽  
Textile Effluent

scholarly journals Photocatalytic activity of Ni0.5Zn0.5Fe2O4@polyaniline decorated BiOCl for azo dye degradation under visible light – integrated role and degradation kinetics interpretation

RSC Advances ◽  
2019 ◽  
Vol 9 (16) ◽  
pp. 8977-8993 ◽  
Author(s):  
Ruchika Tanwar ◽  
Uttam Kumar Mandal
Keyword(s):  
Photocatalytic Activity ◽  
Regression Analysis ◽  
Kinetic Model ◽  
Visible Light ◽  
Azo Dye ◽  
Dye Degradation ◽  
Degradation Kinetics

The photocatalytic activity of BiOCl is tuned through heterogeneous decoration with an integrated Ni0.5Zn0.5Fe2O4@polyaniline. The outstanding degradation capacity, effects of parameters on degradation kinetics and a kinetic model using regression analysis is reported.

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