Treatment of dye-producing chemical industry wastewater by persulfate advanced oxidation

Abstract

A dye-producing chemical industry wastewater in Çorlu (Tekirdağ) is treated by the coagulation-flocculation process of the wastewater. However, the wastewater discharged after coagulation-flocculation still has a very high COD (4402 mg L^-1) with very high proportion of dissolved COD (4316 mg L^-1). Therefore, the aim of this study is to achieve higher COD and color removal in wastewater using Fe²⁺/S₂O₈ or UV/S₂O₈ oxidation process after coagulation-flocculation. The processes in the oxidation of this industrial wastewater using Fe²⁺/S₂O₈ and UV/S₂O₈ were examined and the effect of COD/Fe²⁺/S₂O₈ ratio (in Fe²⁺/S₂O₈) or COD/S₂O₈ ratio (in UV/S₂O₈), pH and oxidation time were evaluated in the study. While high organic matter and color removal was observed in acidic conditions for both processes, optimum pH were 3 and 6 in Fe²⁺/S₂O₈ and UV/S₂O₈ oxidation processes, respectively. In Fe²⁺/S₂O₈ oxidation, 61.1% of COD removal and above 97% of color (UV₄₃₆, UV₅₂₅ and UV₆₂₀) removal was obtained at 1/8/8 of COD/Fe²⁺/S₂O₈ ratio and pH 3 after 1 h oxidation. In UV/S₂O₈ oxidation (COD/S₂O₈ ratio 1/8, pH 6), 54.4% of COD and 98% of color (UV₄₃₆, UV₅₂₅ and UV₆₂₀) removals were achieved after 4 h oxidation. As a result, both Fe²⁺/S₂O₈ and UV/S₂O₈ oxidation processes were applied to ensure discharge standards for color removal from this chemical industry wastewater are effective methods as they provide over 97% color removal. Moreover, COD removal efficiency was approximately 55-60% in both methods. 

Keywords

• Activation
• kinetics
• oxidation
• persulfate
• industrial wastewater treatment

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