Application of Heterogeneous Electro Fenton Process for Chemical Oxygen Demand (cod) Removal From Landfill Leachate
Abstract
Bu çalışmanın amacı depolama sahası sızıntı suyundan KOİ gideriminde heterojen elektro Fenton (HEF) prosesini uygulamaktır. Özgün bir Fe₃O₄/Co₃O₄/CuO-rGO katalizör sentezlenerek HEF performansı incelenmiş ve proses koşullarının numerik optimizasyonunu cevap yüzey yöntemi ile istatistiksel ve matematiksel olarak sağlanmıştır. Optimum şartlar pH 3.7, uygulanan akım 7.5, katalizör dozu 1.38 g/L, reaksiyon süresi 107 dak., bu şartlarda KOİ giderimi %94.88, sistemin enerji tüketimi 75.63 kWh/kg-KOİ olarak belirlenmiştir. Katalizörün zeta potansiyeli -21.73±1.26 mV, BET yüzey alanı 46.80 ± 3.06 m²/g olarak tespit edilmiştir. XRD ve seçilmiş alan elektron kırınımı analizi sonuçlarına göre katalizör çoklu kristal yapıdadır ve ortalama partikül boyutu 10.75 nm olarak hesaplanmıştır. Kurulan kuadratik modelin regresyon katsayısı 0.9916 olup, model istatistiksel olarak güvenilir ve önemli bulunmuştur (p<0.0001). Katalizörün katalitik aktivite deneyleri sonucuna göre anodik oksidasyonda (AO) %43.82, AO-H₂O₂da %53.48, ve adsorpsiyonda %20.11 KOİ giderimi gözlenmiştir. ⦁OH en etkili sorumlu radikal olarak tespit edilmiştir. Katalizörün KOİ giderim verimliliği (%) üzerindeki etkisi 8 döngü boyunca sırasıyla 95.05, 91.5, 90.02, 88.33, 86.27, 82.4, 80.61 ve 79.84 olarak bulunmuştur.
The aim of this study is to apply the heterogeneous electro Fenton (HEF) process for COD removal from landfill leachate. HEF performance was investigated by synthesizing a unique Fe₃O₄/Co₃O₄/CuO-rGO catalyst, and the numerical optimization of the operating conditions was provided statistically and mathematically by the response surface method. Optimum conditions were determined as pH 3.7, applied current 7.5 A, catalyst dose 1.38 g/L, reaction time 107 min. Under these conditions, COD removal was 94.88% and the energy consumption of the system was 75.63 kWh/kg-COD. The zeta potential of the catalyst was determined as -21.73±1.26 mV, and the BET surface area was 46.80 ± 3.06 m²/g. According to the results of XRD and selected area electron diffraction analysis, the catalyst is in a polycrystalline structure and the average particle size was calculated as 10.75 nm. The regression coefficient of the established quadratic model was 0.9916, and the model was found to be statistically reliable and significant (p<0.0001). According to the results of the catalyst's catalytic activity experiments, 43.82% COD removal was observed in anodic oxidation (AO), 53.48% in AO-H₂O₂, and 20.11% in adsorption. ⦁OH has been identified as the most effective responsible radical. The effect of the catalyst on the COD removal efficiency (%) was found to be 95.05, 91.5, 90.02, 88.33, 86.27, 82.4, 80.61 and 79.84 for 8 cycles.
The aim of this study is to apply the heterogeneous electro Fenton (HEF) process for COD removal from landfill leachate. HEF performance was investigated by synthesizing a unique Fe₃O₄/Co₃O₄/CuO-rGO catalyst, and the numerical optimization of the operating conditions was provided statistically and mathematically by the response surface method. Optimum conditions were determined as pH 3.7, applied current 7.5 A, catalyst dose 1.38 g/L, reaction time 107 min. Under these conditions, COD removal was 94.88% and the energy consumption of the system was 75.63 kWh/kg-COD. The zeta potential of the catalyst was determined as -21.73±1.26 mV, and the BET surface area was 46.80 ± 3.06 m²/g. According to the results of XRD and selected area electron diffraction analysis, the catalyst is in a polycrystalline structure and the average particle size was calculated as 10.75 nm. The regression coefficient of the established quadratic model was 0.9916, and the model was found to be statistically reliable and significant (p<0.0001). According to the results of the catalyst's catalytic activity experiments, 43.82% COD removal was observed in anodic oxidation (AO), 53.48% in AO-H₂O₂, and 20.11% in adsorption. ⦁OH has been identified as the most effective responsible radical. The effect of the catalyst on the COD removal efficiency (%) was found to be 95.05, 91.5, 90.02, 88.33, 86.27, 82.4, 80.61 and 79.84 for 8 cycles.
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Keywords
Çevre Mühendisliği, Fenton, Optimizasyon, Organik kirleticiler, Sızıntı suyu, Environmental Engineering, Fenton, Optimization, Organic pollutants, Leachate
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