Treatment of mixed dye wastewater by peroxy-coagulation using stainless steel and graphite electrodes

Year 2023, Volume: 13 Issue: 2, 491 - 499, 15.04.2023

Dilek Gümüş

https://doi.org/10.17714/gumusfenbil.1219165

Abstract

Most of the dyed wastewater is toxic and carcinogenic to living things. Due to their complex structure, they are very difficult to treat with traditional purification methods. Various electrochemical methods have been developed to treat dyed wastewater. In this study, color and COD removal from synthetic wastewater formed by mixed dyes was investigated using peroxy-coagulation method. Stainless steel and graphite electrodes were used as anode and cathode, respectively. The effects of basic operating parameters such as initial pH, current density and electrolysis time were investigated. Taguchi experimental design method (L9) orthogonal array (OA) was applied to examine the effects of the parameters on the electrochemical system. The performance of the system, Signal-to-noise (S/N) ratio (the larger the better) and analysis of variance (ANOVA) were evaluated to compare the relative magnitude of the effect of factors on the response value. Optimum operating conditions were found as initial pH 3, current 100 mA and reaction time 60 minutes. Under these conditions, over 99% color removal and 95% COD removal were achieved, and the total energy consumption was calculated as approximately 25 kWh/kgCOD.

Keywords

Dyed wastewater, Stainless steel anode, Peroxy coagulation

Karışık boyalı atıksuların paslanmaz çelik ve grafit elektrotlar kullanarak peroksi-koagülasyon yöntemiyle arıtılması

Abstract

Boyalı atıksuların çoğu canlılar için toksik ve kanserojendir. Karmaşık yapılarından dolayı geleneksel arıtma yöntemleriyle arıtılmaları oldukça güçtür. Boyalı atıksuları arıtmak için çeşitli elektrokimyasal yöntemler geliştirilmiştir. Bu çalışmada karışık boyaların oluşturduğu sentetik atıksudan renk ve KOİ giderimi peroksi-koagülasyon yöntemi kullanılarak incelenmiştir. Anot ve katot olarak sırasıyla paslanmaz çelik ve grafit elektrotlar kullanılmıştır. Başlangıç pH, akım yoğunluğu ve elektroliz süresi gibi temel işletme parametrelerinin etkisi incelenmiştir. Parametrelerin elektrokimyasal sistem üzerindeki etkilerini incelemek için Taguchi deneysel tasarım yöntemi (L9) orthogonal array (OA) uygulandı. Sistemin performansı, Sinyal/gürültü (S/N) oranı (ne kadar büyükse o kadar iyidir) ve varyans analizi (ANOVA), faktörlerin yanıt değeri üzerindeki etkisinin göreceli olarak büyüklüğünü karşılaştırmak için değerlendirildi. Optimum çalışma koşulları başlangıç pH’ı 3, akım 100 mA ve reaksiyon süresi 60 dakika olarak bulundu. Bu koşullarda %99’un üzerinde renk giderimi ve %95 KOİ giderimi elde edilmiş ve toplam enerji tüketimi yaklaşık 25 kWh/kgKOİ olarak hesaplanmıştır.

Keywords

Boyalı atıksu, Paslanmaz çelik anot, Peroksi koagülasyon

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