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

被引:8
作者
Arslan-Alaton, Idil [1 ]
Gursoy, B. Hande [1 ]
Akyol, Abdurahman [2 ]
Kobya, Mehmet [2 ]
Bayramoglu, Mahmut [3 ]
机构
[1] Istanbul Tech Univ, Fac Civil Engn, Dept Environm Engn, TR-34469 Istanbul, Turkey
[2] Gebze Inst Technol, Dept Environm Engn, TR-41400 Gebze, Turkey
[3] Gebze Inst Technol, Dept Chem Engn, TR-41400 Gebze, Turkey
关键词
Acid Blue 193; activated sludge inhibition; azo dye production effluent; color and organic carbon removal; Fenton's oxidation; response surface methodology (RSM); REMOVAL; UV/H2O2;
D O I
10.2166/wst.2010.256
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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 Fe2+, H2O2 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 Fe2+ = 3 mM; H2O2 = 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.
引用
收藏
页码:209 / 216
页数:8
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