Bira Endüstrisi Atıksularının Elektrokoagülasyon ile Arıtımı ve Hibrit Elektrot Bağlantısının Etkisi

Abstract

Bu çalışmada bir bira fabrikasına ait atıksuyun arıtımında anot ve katotu farklı metallerden oluşturulmuş elektrokoagülasyon (EC) yöntemi kullanılarak prosesin arıtma performansı ve işletme maliyeti analiz edilmiştir. Kesikli işletilen bir EC tankı içerisine demir (Fe) ve alüminyum (Al) elektrotlar sekiz farklı anot-katot-anot-katot (A-C-A-C) kombinasyonunda (Al-Al-Al-Al, Fe-Fe-Fe-Fe, Al-Fe-Fe-Fe, Al-Fe-Fe-Al, Al-Fe-Al-Fe, Fe-Al-Al-Al, Fe-Al-Al-Fe, Fe-Al-Fe-Al) dizilerek, prosesin atıksudan KOİ ve bulanıklık giderme verimleri ile işletme maliyetleri üzerine pH, akım yoğunluğu ve elektroliz süresinin etkileri incelenmiştir. Çalışma sonunda optimum olarak bulunan EC şartlarında (pH 7, akım yoğunluğu: 60 A/m² ve elektroliz süresi: 30 dak.) KOİ ve bulanıklık giderme verimleri demir elektrotlar (Fe-Fe-Fe-Fe) kullanıldığında sırasıyla %80 ve %92 olurken, demir-alüminyum hibrit bağlantılı (Fe-Al-Fe-Al) EC reaktöründe ise %91 ve %97 olarak gerçekleşmiştir. Bir metreküp bira endüstrisi atıksuyunun seçilen optimum şartlar altında EC ile arıtımının işletme maliyeti ~35 TL olarak bulunurken, bir kg KOİ gideriminin maliyeti ise ~12 TL olarak hesaplanmıştır. Çıkış suyu karakteristikleri dikkate alındığında, gelecekteki çalışmalarda hibrit elektrot bağlantılı EC sisteminin benzer nitelikteki endüstriyel atıksular için bir ön arıtma yöntemi olarak kullanılabileceği ve yüksek KOİ konsantrasyonlarını bertaraf edebilecek bir anaerobik proses ile desteklenebileceği veya bir oksidasyon prosesini takiben, çıkış suyunu iyileştirme amacıyla son arıtma olarak değerlendirilebileceği sonucuna varılmıştır.

Keywords

• Elektrokoagülasyon,Bira endüstrisi atıksuları,elektrot materyali,hibrit bağlantı şekli,kimyasal oksijen ihtiyacı,bulanıklık,işletme maliyeti

Treatment of Brewing Wastewater by Electrocoagulation and Effect of Hybrid Electrode Connection

Abstract

In this study, an EC process composed of the different anode and cathode materials was used for the treatment of brewery wastewater and the treatment performance and operating cost were analyzed. Iron (Fe) and aluminum (Al) electrodes are arranged in eight different anode-cathode-anode-cathode (A-C-A-C) combinations (Al-Al-Al-Al, Fe-Fe-Fe-Fe, Al-Fe-Fe-Fe, Al-Fe-Fe-Al, Al-Fe-Al-Fe, Fe-Al-Al-Al, Fe-Al-Al-Fe, Fe-Al-Fe-Al) and the effects of pH, current density and electrolysis time on COD and turbidity removal efficiencies and operating costs were investigated. At the end of the study, at the optimum EC conditions (pH 7, current density: 60 A/m² and electrolysis time: 30 min) COD and turbidity removal efficiencies were 80% and 92%, respectively, for iron electrodes (Fe-Fe-Fe-Fe) and 91% and 97% for EC reactor with iron-aluminum hybrid (Fe-Al-Fe-Al) electrodes. The operating cost of one cubic meter of beer industry wastewater treatment with EC under the optimum conditions was calculated as ~ 35 TL and the cost of one kg COD removal was calculated as ~ 12 TL. Considering the effluent characteristics, in future studies it can be concluded that the hybrid electrode-EC system can be used as a pre-treatment method for similar industrial wastewaters and can be integrated with an anaerobic process that can reduce high COD concentrations or can be considered as the final treatment for the treatment of effluent following an oxidation process.

Keywords

• Electrocoagulation,brewery wastewaters,electrode material,hybrid connection type,chemical oxygen demand,turbidity,operating cost

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