Response surface modeling of COD removal from metal cutting wastewaters via electrooxidation process: Effect of direct photovoltaic solar panel on energy consumption

Yıl 2024, Cilt: 30 Sayı: 4, 547 - 555, 30.08.2024

Murat Solak , Tuğba Arslan Ahmet Akburak

Öz

Today, water and wastewaters are effectively treated with many treatment technologies. However, there are deficiencies in the integration of treatment technologies with renewable energy sources. In this study, the integration of solar energy, one of the renewable energy sources, into electrooxidation (EO) process, which is one of the new generation advanced wastewater treatment techniques, is provided. Parameters affecting the EO process such as pH, current density (C.D.) and electrolysis time (E.T.) was optimized by Box Behnken Design (BBD) on elimination of soluble Chemical Oxygen Demand (sCOD) from metal processing wastewater. The study also tried to determine the optimum conditions for the treatment of metal processing wastewater with EO process by developing different scenarios. The scenario in which the energy requirement was 18.33 kWh/m3 and the COD removal efficiency was 75.23%, i.e. the scenario that maximizes the COD removal efficiency and minimizes the energy consumption (E.C.), is considered to be appropriate. In this case, the optimum pH for the EO process was 5, C.D. was 80 A/m2, E.T. was 22.15 minutes with a desirability of 1. At the optimum conditions (for the 2nd scenario), the E.C. of the EO process was fulfilled from solar panel in a ratio of 15% and 318% in overcast and sunny weather, respectively. Thus, it has been determined that the solar panel integrated EO process is an approach that reduces E.C. and accordingly operating cost, and also has the potential to obtain enough energy to be stored especially in sunny weather.

Anahtar Kelimeler

Electrooxidation, Metal cutting wastewater, Graphite/Titanium electrode, Box-Behnken Design, Photovoltaic Solar Panel, Renewable energy

Metal kesme atıksularından elektrooksidasyon prosesi ile KOİ gideriminin yanıt yüzey modellemesi: Doğrudan fotovoltaik güneş panelinin enerji tüketimine etkisi

Öz

Günümüzde su ve atıksular birçok arıtma teknolojisi ile etkin bir şekilde arıtılmaktadır. Ancak, arıtma teknolojilerinin yenilenebilir enerji kaynakları ile entegrasyonu konusunda eksiklikler bulunmaktadır. Bu çalışmada, yenilenebilir enerji kaynaklarından biri olan güneş enerjisinin yeni nesil ileri arıtma tekniklerinden biri olan elektrooksidasyon (EO) prosesine entegrasyonu sağlanmıştır. EO prosesini etkileyen pH, akım yoğunluğu (A.Y.) ve elektroliz süresi (E.S.) gibi parametreler Box Behnken Tasarımı (BBT) ile metal işleme atıksuyundan Çözünmüş Kimyasal Oksijen İhtiyacının (KOİ) giderimi üzerine optimize edilmiştir. Çalışmada ayrıca farklı senaryolar geliştirilerek metal işleme atıksularının EO prosesi ile arıtımı için optimum koşullar belirlenmeye çalışılmıştır. Enerji ihtiyacının 18.33 kWh/m3 ve KOİ giderim veriminin %75.23 olduğu senaryo, yani KOİ giderim verimini maksimize eden ve enerji tüketimini minimize eden senaryonun uygun olduğu düşünülmektedir. Bu durumda, EO prosesi için optimum pH 5, A.Y. 80 A/m2, E.S. 22.15 dakika olmuştur. Optimum koşullarda (2. senaryo için), EO prosesinin enerji tüketimi kapalı ve güneşli havalarda sırasıyla %15 ve %318 oranında güneş panelinden karşılanmıştır. Böylelikle, güneş paneli entegreli EO prosesinin enerji tüketimini ve buna bağlı olarak işletme maliyetini azaltan, ayrıca özellikle güneşli havalarda depolanacak kadar enerji elde edilebilme potansiyeli olan bir yaklaşım olduğu belirlenmiştir.

Anahtar Kelimeler

Elektrooksidasyon, Metal kesme atıksuları, Grafit/Titanyum elektrot, Box-Behnken Tasarımı, Fotovoltaik Güneş Paneli, Yenilenebilir Enerji

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