Oto Yıkama Atıksularının Klasik Fenton Prosesiyle Arıtımı: Ön Çöktürmenin KOİ Giderim Kinetiği Üzerine Etkisi

Öz

Nüfusa paralel olarak trafikteki araç sayısı da her geçen gün artmaktadır. Dolayısıyla araçların yıkanmasından kaynaklanan atıksuların miktarı da önemli boyutlara ulaşmaktadır. Bu atıksuların çoğu evsel atıksu sınıfında olmayıp doğrudan kanalizasyona verilmektedir. Bu çalışmada, 2 farklı oto yıkama tesisine ait 4 tip (ham ve ön çökeltim uygulanmış) atıksuda kimyasal oksijen ihtiyacı (KOİ) giderimi amacıyla klasik Fenton prosesi uygulanmıştır. Deneysel çalışmalar sonunda sabit pH = 3 değerinde, optimum kimyasal dozlar; 1 nolu tesisten alınan ham atıksu için: [Fe+2] = 100 mg L-1, [H2O2] = 200 mg L-1 ve ön arıtım uygulanan örnek için bu değerler [Fe+2] = 75 mg L-1, [H2O2] = 150 mg L-1 olarak tespit edilirken, 2 nolu tesisten alınan ham atıksu için [Fe+2] = 100 mg L-1, [H2O2] = 225 mg L-1, ön çökeltim uygulandıktan sonra ise [Fe+2] = 75 mg L-1, [H2O2] = 100 mg L-1 olarak belirlenmiştir. Prosesin arıtım verimliliği değerlendirildiğinde, optimum koşullarda KOİ giderimi 1. Atıksu örneği için sırasıyla, %86 ve %89 iken 2. örnekte ise bu değerler sırasıyla %90 ve %98’dir. Reaksiyon kinetiği incelendiğinde, ham atıksularda oksidasyon mekanizmasının genel itibariyle 2. derece kinetiğe uygun olduğu görülse de (R2=0,55 ve 0,95) ön çöktürme sonrası ayrışma mekanizmasının BMG kinetik modeline daha fazla uyum gösterdiği (R2=0,99) ortaya çıkarılmıştır.

Anahtar Kelimeler

• Oto Yıkama Atıksuları
• Fenton Prosesi
• KOİ
• İleri Oksidasyon

Treatment of Auto Wash Wastewater with Classical Fenton Process: Effect of Pre-Settling on COD Removal Kinetics

Öz

In parallel with the population, the number of vehicles in traffic is increasing day by day. Therefore, the volume of wastewater generated by vehicle cleaning reaches substantial proportions. While most of these wastewaters are not classified as domestic wastewater, they are directly discharged to the sewerage. In this study, classical Fenton process was applied to remove chemical oxygen demand (COD) from 4 types (raw and pre-treated) wastewater belonging to 2 different car wash plants. At the end of experimental studies, optimum chemical doses at a constant pH = 3 value; for the sample taken from the 1nd plant without pre-settling:[Fe+ 2]= 100 mg L-1, [H2O2]= 200 mg L-1 and for the sample treated with pretreatment these values [Fe+ 2]= 75 mg L-1, [H2O2]= 150 mg L-1, for the raw wastewater sample taken from the 2nd plant, [Fe+ 2]= 100 mg L-1, [H2O2]= 225 mg L-1, after pre-settling whereas [Fe+ 2] = 75 mg L-1, [H2O2]= 100 mg L-1. COD removal in ideal conditions for the first wastewater sample is 86 percent and 89 percent, respectively, while these values are 90 percent and 98 percent for the second sample. The oxidation process in raw wastewater was found to be generally appropriate for 2nd order kinetics (R2 = 0.55 and 0.95), but the decomposition mechanism after pre-settling was found to be more consistent with the BMG kinetic model (R2 = 0.99).

Anahtar Kelimeler

• Car Wash Wastewater
• Fenton Process
• COD
• Advanced Oxidation

Kaynakça

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