Modeling and optimization of acid dye manufacturing wastewater treatment with Fenton's reagent: comparison with electrocoagulation treatment results and effects on activated sludge inhibition

Modeling and optimization of acid dye manufacturing wastewater treatment with Fenton's reagent: comparison with electrocoagulation treatment results and effects on activated sludge inhibition

In the present study, Fenton's oxidation of a chromium complex disazo dye (Acid Blue 193) synthesis wastewater was evaluated, modeled and optimized by employing Central Composite Design. Within this context, the individual and interactive effects of critical process parameters such as Fe(2 + ),...

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Bibliographic Details
Published in:Water science and technology Vol. 62; no. 1; pp. 209 - 216
Main Authors: Arslan-Alaton, Idil, Gursoy, B Hande, Akyol, Abdurahman, Kobya, Mehmet, Bayramoglu, Mahmut
Format: Journal Article
Language:English
Published: England IWA Publishing 01-01-2010
Subjects:
Activated sludge
Azo dyes
Chemical oxygen demand
Chromium
Color
Colour
Design optimization
Domestic wastewater
Dyes
Effluents
Electrocoagulation
Fentons reagent
Hydrogen peroxide
Hydrogen Peroxide - chemistry
Iron - chemistry
Manufacturing wastes
Modelling
Models, Chemical
Naphthalenesulfonates - chemistry
Organic carbon
Organometallic Compounds - chemistry
Oxidation
Oxidation-Reduction
Oxygen consumption
Oxygen uptake
pH effects
Process parameters
Pulp mill effluents
Reaction time
Regression analysis
Regression models
Removal
Sewage
Sludge
Statistical analysis
Synthesis
Total organic carbon
Uptake
Waste Disposal, Fluid - methods
Wastewater
Wastewater treatment
Working conditions
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Summary:In the present study, Fenton's oxidation of a chromium complex disazo dye (Acid Blue 193) synthesis wastewater was evaluated, modeled and optimized by employing Central Composite Design. Within this context, the individual and interactive effects of critical process parameters such as Fe(2 + ), H(2)O(2) concentrations, initial chemical oxygen demand (COD) and reaction time was assessed. The process response (output) variables were chosen as percent color, COD and total organic carbon (TOC) removal efficiencies. Optimum working conditions in terms of color and organic carbon removals were established to be Fe(2 + )=3 mM; H(2)O(2)=25 mM; reaction time = 10 min at pH 3 and an initial COD content of 245 mg/L. Under these conditions, 96% color, 82% COD and 51% TOC removals were obtained. The established polynomial regression models describing color, COD and TOC removals satisfactorily fitted the experimental data and could be used to predict Fenton's treatment results at statistically significant rates. Optimized treatment results were compared with those obtained via electrocoagulation treatment under optimized conditions (applied current = 50 A/m(2); reaction time = 15 min; initial pH = 7 for an initial COD content of 245 mg/L). The relative inhibition of heterotrophic oxygen uptake rate was measured to examine the inhibitory effect of azo dye synthesis effluent before and after Fenton's oxidation and electrocoagulation with respect to synthetic domestic wastewater. Untreated azo dye production wastewater exhibited a slightly inhibitory effect that was appreciably reduced but not entirely removed after Fenton's oxidation, whereas no inhibition of mixed bioculture was observed for azo dye synthesis effluent subjected to electrocoagulation treatment.
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content type line 23
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2010.256