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Background and Objectives: Colored wastewaters are known as one of the most important
sources of environmental pollutants. Having toxic chemicals and aesthetic
problems has made treatment of these wastewaters very crucial. So far a number
of methods such as electrochemical treatment, coagulation and flocculation, and
adsorption have been used for treatment of textile industries wastewater.
Hence, the efficiency of zero-valent
iron powder in the presence of UV light and hydrogen peroxide to remove Acid
Orange 7 and Reactive Black 5 from the synthetic solutions was investigated.
Materials and Methods: Conducting all experiments in a batch reactor, we examined different parameters
including initial concentration of the color (25, 50, 75 mg/L), contact time
(30, 60, 120 min), pH (3, 7, 11), the
amount of iron powder (0.6, 1.3, 2 g/l), and hydrogen peroxide concentration
(10, 15, 20 ml/l).
Result: The results
showed that dye removal efficiency was increased by increasing contact time,
the amount of iron powder and hydrogen peroxide concentration. On the other
hand, with the increasing pH and initial concentration of dye, removal
efficiency decreased in both AO7and RB5 dyes.
Conclusion: We found
that the integrated ZVI/UV/H
2O
2 method has high efficiency in removing azo dyes Acid
Orange 7 and Reactive Black 5.
