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Background and Objectives: Synthetic dyes represent one of the largest groups of
pollutants in wastewater of dying industries. Discharging these wastewaters
into receiving streams not only affects the aesthetic but also reduces
photosynthetic activity. Electrochemical advanced oxidation processes such as
Electro-Fenton process are low operational and have high mineralization degree
of pollutants. In this study, we investigated affective factors in this process
to determine the optimum conditions for dye and COD removal from aqueous
solutions containing Reactive Blue 19 dye.
Materials and Methods: Synthetic samples containing Reactive Blue 19 dye were prepared by dissolving
dye powder in double distilled water. and the the solution prepared was
transferred into pilot electrochemical cell having two anode and cathode
electrode made of iron and carbon. Electro-Fenton process was began by adding
of Fe
2+ ions and establishing electrical potential difference. After
testing and at specified time intervals, each sample was collected from the
pilot cell, and process performance was evaluated through measuring dye
concentration and COD.
Results: Based on the
results obtained, optimum conditions of Electro-Fenton process for dye and COD
removal was determined. Accordingly, potential difference of 20 volt for dye
concentration up to 100 mg/L and potential difference of 30 volt for dye
concentration of more than 200 mg/L, reaction time 60 minutes, 0.5 mg/L of Fe
2+ concentration and suitable pH for the maximum dye removal efficiency equaled 4
respectively. Under such conditions, the dye and COD removal was 100 and 95%
respectively.
Conclusion: Based on
the results obtained, it was revealed that Electro-Fenton process has
significant ability in not only dye removal but also in COD removal.
Accordingly, it was found that the effective parameters in Electro-Fenton
process for removal Reactive Blue19 dye are electric potential difference,
concentration of iron ions and electrolysis time.
