The use of a specific function to estimate maximum methane production in a batch fed anaerobic reactor
The use of a specific function to estimate maximum methane production in a batch fed anaerobic reactor
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
anaerobic digestion, first order model, kinetics, methane production
1174-1178
Redzwan, Ghufran
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
October 2004
Redzwan, Ghufran
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Redzwan, Ghufran
(2004)
The use of a specific function to estimate maximum methane production in a batch fed anaerobic reactor.
Journal of Chemical Technology and Biotechnology, 79 (10), .
(doi:10.1002/jctb.1107).
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
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Published date: October 2004
Keywords:
anaerobic digestion, first order model, kinetics, methane production
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Local EPrints ID: 53697
URI: http://eprints.soton.ac.uk/id/eprint/53697
ISSN: 0268-2575
PURE UUID: ab5560f1-457c-40c0-9a20-179d1e04a1f8
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Date deposited: 17 Jul 2008
Last modified: 16 Mar 2024 02:52
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