Kajian ini dijalankan adalah untuk mengetahui prestasi sel bahan api mikrob terhadap kepekatan asetat. Asetat digunakan sebagai sumber karbon bagi penghasilan kuasa elektrik dan G. sulfurreducens sebagai pemangkin biologi. Kepelbagaian kepekatan asetat (20, 60, 100 mM) digunakan didalam kamar kaca sel mikrob. Keputusan menunjukkan bahawa kepekatan asetat yang menghasilkan elektrik yang tinggi adalah 60 mM asetat dengan menghasilkan elektrik sebanyak 0.72 mA dan kuasa sebanyak 0.074 mW. Keputusan juga menunjukkan bahawa perencatan bagi substrat menyebabkan kesan yang luas kepada prestasi sel bahan api mikrob pada kepekatan asetat yang tinggi. Berdasarkan kepada kajian ini juga, menunjukkan prestasi G. sulfurreducens di dalam sel bahan api sesuai pada 60 mM kepekatan asetat. Persamaan matematik bagi prinsip kinetik digunakan. Persamaan Logistik untuk pertumbuhan sel, Logistik digabungkan bersama Leudeking-Piret dicadang dan disahkan untuk kajian ini. Data yang dapat dari hasil kajian telah digunakan untuk model ini. Model ini dapat meramal pertumbuhan cell dan mengurangan asetat dengan nilai R2 diantara 0.935 hingga 0.993. Di dalam semua kes bagi kajian ini, model simulasi agak serasi dengan data kajian, dengan itu mungkin dapat dijelaskan ciri-ciri G. sulfurreducens untuk meningkatkan penghasilan kuasa elektrik. Kepekatan substrata amat penting dan memberikan kesan yang besar kepada prestasi sel bahan api mikrob.
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In this study the effect of acetate concentration on the performance of microbial fuel cells was investigated. The acetate was utilized as the carbon source for the production of electrical energy by means of G. sulfurreducens as the biocatalyst. Acetate concentration in the range (20, 60 and 100 mM) were experimenting with a glass single-chamber design of MFCs. The results revealed that the optimum concentration with highest electrical performance were 60 mM of acetate with the current generation 0.72 mA and power 0.074 mW. The results indicated that the substrate inhibition effect may have a significant role in the performance of MFCs at high concentration of acetate. Based on this study, it clearly verified that the performance of G. sulfurreducens in a microbial fuel cell was the most favourable at 60 mM of acetate concentration. A mathematical description of the principle kinetics involved in anode MFCs system was attained using an unstructured model. The Logistic equations for cell growth, the Logistic incorporated Leudeking-Piret-like equation for acetate consumption were proposed in this study. Experimental data were obtained from anode batch MFCs system in the anaerobic process by G. sulfurreduces were fitted to the models. The models were capable of predicting the cell growth and acetate consumption with R2 ranging from 0.935 to 0.993. In all cases, the model simulation matched well with the experimental observation, which made it possible to elucidate the anaerobic fermentation characteristic of G. sulfurreducens using for enhancing current generation. Substrate concentration has an important role on the performance of MFCs system.
Electrochemical activity and kinetic study of the redox processes in microbial fuel cells at different initial substrate concentrations / Muhammad Hazim Yaacob