Maximizing Biogas Yield in Anaerobic Digestion: A Response Surface Methodology Approach

Abstract

The aim of this study is to evaluate the eutrophication water and cattle manure wastes in the Güldürcek dam reservoir that meets the drinking water of Çankırı province in biogas production and to contribute to the economy of Çankırı province. Microwave pretreatment experiments were carried out but it was determined that it did not increase the biogas efficiency. In the study, it was determined that when eutrophication water was mixed with cattle manure by the RSM method and the mixing ratio was 1/1, the highest methane production was obtained at a rate of 83-86% in the first 8 and 24 hours under optimum conditions with anaerobic digestion at a temperature of 35 °C. The composition of the obtained biogas was measured as follows; carbon dioxide (CO2) 7.65%, oxygen (O2) 4.5%, hydrogen (H2) 0.018% and hydrogen sulfide (H2S) zero. Another point to be noted in the analysis results is that the H2S rate, which is formed as a result of anaerobic digestion and causes economic losses due to corrosion of metal equipment in the system, is zero. According to the RSM method, the most suitable model was found to be Quadratic. The high R2 value of the selected model (0.9649) supports the accuracy of the model.

Keywords

• Biogas production
• Anaerobic digestion
• Eutrophication water
• Cattle waste
• Response surface methodology

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