Treatment Of Enamel Coating Facility Wastewaters Via Conventional and Modified Fenton Processes

Öz

Enamel coating facility wastewaters include high concentrations of oil-grease, colour, chemical oxygen demand (COD) and heavy metals such as chromium, nickel, cadmium, iron and zinc. In this study, treatment of enamel coating facility wastewaters by conventional and modified Fenton process was investigated. The COD parameter was selected as the target parameter in the wastewater for both Fenton processes. The optimization of initial pH, catalyst iron concentration and hydrogen peroxide (H₂O₂) concentration was performed for an efficient treatment. Also change in COD concentration as a function of time under optimal conditions and kinetic studies were investigated. As a result of the study, optimum experimental conditions were determined as pH = 3, [Fe²⁺] = 150 mg/L and [H₂O₂] = 250 mg/L for conventional Fenton process and pH = 3, [Fe⁰] = 200 mg/L ve [H₂O₂] = 200 mg/L for modified Fenton process. Under these conditions, due to the abundant presence of reaction components in the reaction mixture, COD removal was occurred rapidly in the first 5 minutes of reaction period, and later on the removal rate and efficiency were decreased in the remained period because of the decreases in the Fenton reagents. COD removal via modified Fenton process was slower compared to the conventional Fenton process, since metallic iron had to solubilize first in the modified process. Consequently, it was determined that conventional Fenton process is an efficient process for the treatment of enamel coating facility wastewaters. The experimental data was fitted to second order kinetics for both Fenton processes. 

Anahtar Kelimeler

• Enamel coating,COD,Fenton,wastewater

Emaye Kaplama Endüstrisi Atıksularının Klasik Ve Modifiye Fenton Prosesleri İle Arıtımı

Öz

Emaye kaplama endüstrisi atıksuları yağ-gres, renk, kimyasal oksijen ihtiyacı (KOİ), siyanür ve krom, nikel, çinko, kadmiyum, demir vb. ağır metal içeriği yüksek atıksulardır. Bu çalışma kapsamında, emaye kaplama endüstrisi atıksularının klasik ve mofidiye Fenton prosesleri ile arıtımı incelenmiştir. Her iki metodun da verimini izlemek için hedef parametre olarak kimyasal oksijen ihtiyacı (KOİ) seçilmiştir. Çalışmada, atıksuyun başlangıç pH’ı, katalist demir (Fe²⁺ veya Fe⁰) konsantrasyonu ve hidrojen peroksit (H₂O₂) konsantrasyonlarının optimizasyonu gerçekleştirilmiştir. Ayrıca optimum şartlarda kinetik çalışma da gerçekleştirilmiştir. Optimum deneysel şartlar, klasik Fenton prosesi için pH = 3, [Fe²⁺] = 150 mg/L ve [H₂O₂] = 250 mg/L ve modifiye Fenton prosesi için pH = 3, [Fe⁰] = 200 mg/L ve [H₂O₂] = 200 mg/L olarak belirlenmiştir. Optimum şartlarda, klasik Fenton prosesi ile KOİ gideriminin ilk 5 dakikada reaksiyon bileşenlerinin ortamdaki yeterli varlığından dolayı çok hızlı gerçekleştiği ve sonrasında giderim hızının azaldığı gözlemlenmiştir. Modifiye Fenton prosesinde ise KOİ giderimi, metalik demir tozunun öncelikle çözünmesi gerektiği için daha yavaş gerçekleşmiştir. Kinetik çalışmada ise Fenton prosesinin her iki uygulamasının da ikinci derece kinetiğe uyduğu belirlenmiştir. 

Anahtar Kelimeler

• Atıksu,emaye kaplama,Fenton,KOİ

Kaynakça

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