The use of a specific function to estimate maximum methane production in a batch‐fed anaerobic reactor |
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Authors: | Ghufran Redzwan Charles Banks |
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Abstract: | A readily biodegradable substrate was used to assess the value of using a mathematical function of y = ymaxexpm/x as a simplified method of determining the maximum methane production (Gmax) in a batch anaerobic reactor. Experimental results to test the method used three different initial substrate loadings in pre‐acclimatised completely mixed anaerobic reactors. Gas production was found to follow a typical trend that has previously been described by first order reaction kinetics; for the purpose of fitting the linearisation, it requires a value for maximum cumulative methane production. Use of the modified specific function to yield the equation G = Gmaxexpm/t showed that the experimental gas production curve could be estimated with a high degree of similarity. This was confirmed by a statistical analysis using the method of residuals which gave a correlation coefficient (R2) greater than 0.97 between experimental and estimated values. Using a graphical linearisation of the specific function produced a simplified method of predicting Gmax. The value obtained was then used in a first order kinetic model to derive the specific coefficient rate (Ko), which was in agreement with other methods used for its determination. Copyright © 2004 Society of Chemical Industry |
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Keywords: | anaerobic digestion first order model kinetics methane production |
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