Mikrobiyal Yakıt Hücresinde Nişasta İçerikli Atığın Oksidasyonu ile Elektrik Üretimi

Abstract

Organik içeriği yüksek atıkların enerji üretiminde kullanılması çevresel ve ekonomik açıdan tercih edilen bir yaklaşımdır. Bu çalışmada patates nişastası üretim prosesinden ol”uşan nişasta atığının mikrobiyal yakıt hücresinde elektrik üretim potansiyeli değerlendirilmiştir. Mikrobiyal yakıt hücresi olarak karbon kumaş elektrotların kullanıldığı çift odacıklı hücre kullanılmıştır. Nişasta atığının sulu karışımı ham, asidik koşullarda termal işlem (pH:2.5, 180 dk kaynatma) (AT) ve asidik koşullarda yüksek basınçta termal işlem (135 oC, pH 2.15, 2 atm, 60 dk) (ABT) gördükten sonra kullanılarak ön işlemin elektrik üretimine etkisi değerlendirilmiştir. Nişasta karışımı anot bölmesinde elektron verici substrat, oksijen ise katot bölmesinde elektron alıcısı olarak kullanılmıştır. 100 Ω dirence karşı voltaj eğrileri çıkarılmıştır. Polarizasyon eğrisi ile elde edilen maksimum güç yoğunlukları ham, AT ve ABT biyokütleleri ile işle-timlerde sırasıyla 1.894 mW/m2, 10.919 mW/m2 ve 8.926 mW/m2 olarak elde edilmiştir. Ham, AT ve ABT biyoküt-leleri ile işletilen MYHler için elde edilen iç dirençler ise sırasıyla, 9692 Ω, 1363 Ω ve 1760 Ω olarak belirlenmiştir. 2600 dk işletilen MYH denemeleri sonrası ham AT ve ABT işletimleri için KOİ giderim verimleri sırasıyla 40.27, 44.44 ve 52.46 olarak bulunurken, kolombik verimler sırasıyla 1.79, 5.03 ve 1.93 olarak belirlenmiştir.

Keywords

• kolombik verimlilik
• mikrobiyal yakıt hücresi
• Atık nişasta
• elektrik üretimi
• termokimyasal ön işlem

Electricity Generation by Oxidation of Starch-Containing Waste in Microbial Fuel Cell

Abstract

The use of wastes with high organic content in energy production is an environmentally and economically preferred approach. In this study, the electricity generation potential of the starch waste generated from the potato starch production process in the microbial fuel cell was evaluated. A dual-chamber cell using carbon cloth electrodes was used as a microbial fuel cell. The effect of pre-treatment on electricity generation was evaluated by using the slurry of starch waste after raw and pre-treatment (thermal treatment (AT) in acidic conditions and high-pressure thermal treatment (ABT) in acidic conditions. The starch mixture was used as an electron donor substrate in the anode compartment, and oxygen as an electron-donating substrate in the cathode compartment. Voltage curves against 100 Ω resistance are plotted. The maximum power densities obtained by the polarization were obtained as 1.894 mW/m2, 10.919 mW/m2 and 8.926 mW/m2 in the operations with raw, AT, and ABT biomass, respectively. The internal re-sistances obtained for MFCs operated with raw, AT and ABT biomass were determined as 9692 Ω, 1363 Ω and 1760 Ω, respectively. The COD removal efficiencies for the raw AT and ABT operations after the 2600 min run MFC trials were found to be 40.27, 44.44 and 52.46, respectively, while the coulombic efficiencies were determined as 1.79, 5.03 and 1.93, respectively.

Keywords

• coulombic efficiency
• microbial fuel cell
• Waste starch
• electric production
• thermochemical pretreatment

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