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

Authors : Deniz İzlen CİFCİ, Elçin GÜNEŞ, Yalçın GÜNEŞ

Pages : 149-156

Doi:10.35208/ert.771190

View : 19 | Download : 14

Publication Date : 2020-12-31

Article Type : Research Paper

Abstract :A dye-producing chemical industry wastewater in Çorlu insert ignore into journalissuearticles values(Tekirdağ); is treated by the coagulation-flocculation process of the wastewater. However, the wastewater discharged after coagulation-flocculation still has a very high COD insert ignore into journalissuearticles values(4402 mg L -1 ); with very high proportion of dissolved COD insert ignore into journalissuearticles values(4316 mg L -1 );. Therefore, the aim of this study is to achieve higher COD and color removal in wastewater using Fe 2+ /S 2 O 8 or UV/S 2 O 8 oxidation process after coagulation-flocculation. The processes in the oxidation of this industrial wastewater using Fe 2+ /S 2 O 8 and UV/S 2 O 8 were examined and the effect of COD/Fe 2+ /S 2 O 8 ratio insert ignore into journalissuearticles values(in Fe 2+ /S 2 O 8 ); or COD/S 2 O 8 ratio insert ignore into journalissuearticles values(in UV/S 2 O 8 );, 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 Fe 2+ /S 2 O 8 and UV/S 2 O 8 oxidation processes, respectively. In Fe 2+ /S 2 O 8 oxidation, 61.1% of COD removal and above 97% of color insert ignore into journalissuearticles values(UV 436 , UV 525 and UV 620 ); removal was obtained at 1/8/8 of COD/Fe 2+ /S 2 O 8 ratio and pH 3 after 1 h oxidation. In UV/S 2 O 8 oxidation insert ignore into journalissuearticles values(COD/S 2 O 8 ratio 1/8, pH 6);, 54.4% of COD and 98% of color insert ignore into journalissuearticles values(UV 436 , UV 525 and UV 620 ); removals were achieved after 4 h oxidation. As a result, both Fe 2+ /S 2 O 8 and UV/S 2 O 8 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