Removal of Reactive Scarlet Dye and COD Using Cylindrical Iron Rod Anodes In A Semi-Continuous Reactor

Authors

  • Ersin Aytac  Department of Environmental Engineering, Zonguldak Bülent Ecevit University, Zonguldak, Turkey
  • Umran Tezcan Un  Department of Environmental Engineering, Eskisehir Technical University, Eski?ehir, Turkey

Keywords:

COD Removal, Decolorization, Electrochemical Treatment, Iron Electrode, Reactive.

Abstract

The cylindrical iron electrochemical reactor for electrocoagulation (EC) of reactive scarlet dye was studied. In the study, 0.5 L synthetic wastewaters with a dye concentration of 200 mg/L and chemical oxygen demand of 620 mg/L (COD) prepared in laboratuary treated for 90 minutes of EC. The effects of operational parameters such as current density (10 - 30 mA/cm2), initial pH (5 - 9), flow rate (100 - 400 mL/min) and the supporting electrolyte concentration (0.05 - 0.2 M Na2SO4) were investigated. For each operation parameter, dye stuff concentration and chemical oxygen demand has been measured for removal efficiencies after treatment duration. To estimate the operating cost, the electrical energy consumption was calculated. It has been observed that current density has positive effect on removal efficiencies. Moreover adequate dye stuff removals has been achieved in short process time and low current efficiencies. When effect of the initial pH value of the wastewater was examined, it was observed that the optimum pH value was 7.1. When investigating the influence of flow rate it was found that higher flow rates has ngative effect by breaking up the aggregates. The lowest electrical energy consumptions has been established in 0.2 M Na2SO4 concentration for the effect of supporting electrolyte concentration. Effluent COD concentration of 22 mg/L with a removal efficiency of 96.5% and effluent dye concentration of 1.08 mg/L with a removal efficiency of 99.46% was obtained with an electrical energy consumption of 4.28x10-4 kWh/mg CODremoved. Additionally, the sludge produced at electrocoagulation was characterized and maghemite (Fe2O3) was found as most common species.

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International Journal of Scientific Research in Science and Technology

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Published

2018-06-30

Issue

Volume 4, Issue 8, May-June-2018

Section

Research Articles

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How to Cite

[1]
Ersin Aytac, Umran Tezcan Un, " Removal of Reactive Scarlet Dye and COD Using Cylindrical Iron Rod Anodes In A Semi-Continuous Reactor, International Journal of Scientific Research in Science and Technology(IJSRST), Online ISSN : 2395-602X, Print ISSN : 2395-6011, Volume 4, Issue 8, pp.517-525, May-June-2018.