Effect of microaerobic conditions on the degradation kinetics of cellulose |
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Authors: | Díaz I Donoso-Bravo A Fdz-Polanco M |
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Institution: | aDepartment of Chemical Engineering and Environmental Technology, Escuela de Ingenierías Industriales, Sede Dr. Mergelina, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain;bAutomatic Control Laboratory, University of Mons, 31 Boulevard Dolez, B-7000 Mons, Belgium |
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Abstract: | Limited oxygen supply to sludge digesters has shown to be an effective method to eliminate hydrogen sulfide from the biogas produced during anaerobic digestion but uneven results have been found in terms of the effect on the degradation of complex organic matter. In this study, the effect that the limited oxygen supply provoked on the “anaerobic” degradation of cellulose was evaluated in batch-tests. The microaerobic assays showed to reach a similar maximum production of methane than the anaerobic ones after 19 d and a similar hydrolytic activity (considering a first order rate constant); however, the microaerobic assays presented a shorter lag-phase time than the anaerobic test resulting in faster production of methane during the first steps of the degradation; specifically, the maximum methane production found in the anaerobic test in 19 d was found in the microaerobic test before the day 15. |
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Keywords: | Microaerobic Hydrolytic activity Cellulose degradation Gompertz equation Lag-phase |
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