OPTIMIZATION OF THERMO-ALKALINE PRETREATMENTOFCATTLE RUMEN CONTENT FOR BIOGAS PRODUCTION USING SODIUM HYDROXIDE
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Biogas is a gas mixture consisting mainly of methane and carbon(IV)oxide resulting from the biological process of anaerobic digestion of various organicmaterials. The percentage of methane in biogas will vary depending on the processconditions and the type of organic matter fermented. This study investigatedtheeffects of thermal and alkaline pretreatment methods on cattle rumen content andincrease the biogas yield. In the course of this study, sodiumhydroxide (NaOH) was the alkali of choice and temperature ranges of 70ºc 80ºc and 90ºc in a BoxBehnken design. Modelling was carried out with using Response Surface Methodology (RSM) which was used for the Analysis of Variance (ANOVA) andmultiple regression analysis of the data obtained. The R2 value of 0.9768for NaOH, contour plots, ANOVA analysis all shows how suitable the RSMmodel is for theexperiment. The optimum conditions necessary for maximum feedstock degradation for the alkaline was examined and it was found by using NaOH atatemperature of 80.171ºC, timed 13.086 minutes and a molar concentration of 2.05M and the degree of degradation is 56.83%.
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