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

Year 2017, Volume: 6 Issue: 1, 30 - 38, 28.07.2017

Serkan Sahinkaya

https://doi.org/10.17100/nevbiltek.288641

Cited By: 1

Abstract

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. 

Keywords

Enamel coating, COD, Fenton, wastewater

Emaye Kaplama Endüstrisi Atıksularının Klasik Ve Modifiye Fenton Prosesleri İle Arıtımı

Abstract

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. 

Keywords

Atıksu, emaye kaplama, Fenton, KOİ

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