The Effect of pH and Current Density on COD and Color Removal from Slaughterhouse Wastewater by Electrooxidation System

Öz

In the study, the effect of current density (4,06, 6,09, 8,12, 10,15 ve 12,18 mA/cm2) and pH (3,0, ~7,0 (natural), 9,0, and 11,0), which are important parameters affecting the removal performance of the system, while removing chemical oxygen demand (COD) and color from slaughterhouse wastewater with the electrooxidation system was investigated. Sieve type Ti/Pt was used as anode material and sieve type uncoated Ti was used as cathode material. According to the results obtained from laboratory experiments, COD and color removal increased with the increase of applied current density. This can be attributed to the characteristic of the electrooxidation system, in which both direct and mediated oxidation reactions play an important role. It was found that the removal efficiencies depend not only on the initial pH but also, on the pH after the reaction completion. It has been observed that the removal efficiencies of the system are better in neutral and weakly basic conditions, and it is relatively low in strongly basic conditions, and current density and pH are effective parameters in the treatment of slaughterhouse wastewater by the lab-scale electrooxidation system.

Anahtar Kelimeler

• Slaughterhouse wastewater
• wastewater treatment
• COD
• color
• electrooxidation
• current density
• pH

Mezbaha Atıksularından Elektrooksidasyon Sistemi ile KOİ ve Renk Giderilmesi Üzerine pH ve Akım Yoğunluğunun Etkisi

Öz

Çalışmada mezbaha atıksularından elektrooksidasyon sistemi ile Kimyasal oksijen ihtiyacı (KOİ) ve renk giderilirken sistemin giderim performansını etkileyen önemli parametrelerden akım yoğunluğu (4,06, 6,09, 8,12, 10,15 ve 12,18 mA/cm2) ve pH’nın (3,0, doğal pH (~7,0), 9,0 ve 11,0) etkisi incelenmiştir. Anot malzemesi olarak elek tipi Ti/Pt, katot malzemesi olarak elek tipi kaplanmamış Ti kullanılmıştır. Laboratuvar deneylerinden elde edilen sonuçlara göre, uygulanan akım yoğunluğunun artmasıyla KOİ ve renk gideriminde de artış meydana gelmiştir. Bu durum hem doğrudan hem de aracılı oksidasyon reaksiyonunun önemli bir rol oynadığı elektrooksidasyon sisteminin karakteristiğine bağlanabilir. Giderim verimlerinin başlangıç pH değerine bağlı olduğu kadar reaksiyon sonundaki pH değerine de bağlı olduğu bulunmuştur. Nötr ve zayıf bazik koşullarda sistemin giderim oranının daha iyi olduğu ve güçlü bazik koşullarda nispeten düşük olduğu ve mezbaha atıksularının laboratuvar ölçekte elektrooksidasyon sistemi ile arıtımında akım yoğunluğu ve pH etkin parametreler olduğu sonucuna varılmıştır.

Anahtar Kelimeler

• Mezbaha atıksuyu
• atıksu arıtımı
• KOİ
• renk
• elektrooksidasyon
• akım yoğunluğu
• pH

Kaynakça

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