ISSN: 0973-7510

E-ISSN: 2581-690X

Feng Lei , Xu Jie, Zhang Xu Dong and Li Run Dong
1Liaoning Province Clean Energy Key Laboratory, Shenyang Aerospace University,
Shenyang – 110 136 , China.
J Pure Appl Microbiol. 2014;8(2):1407-1414
© The Author(s). 2014
Received: 09/01/2014 | Accepted: 18/03/2014 | Published: 31/04/2014
Abstract

With zero- and first-order kinetics, the hydrolysis and gas production process during the batch anaerobic digestion of single components and mixed kitchen waste were analyzed. It was found that in the single-component system, the zero-order kinetic and first-order kinetic fitting results were close, with a coefficient of correlation R2 of 0.95. The descending of the tested components by their hydrolysis and gas-production speed was proteins > starches > celluloses > lipids, and the hydrolysis constants k for the components were correspondingly 0.0366, 0.0331, 0.0215, and 0.0154. The zero- and first-order kinetic fitting results were close. The gas production process had some proportional relationship with the hydrolysis process, but had no obvious relationship with the acid-production acidogenesis process. For mixed kitchen wastes, the four-component first-order kinetics model, which considers the multiple components being hydrolyzed separately with different hydrolysis constants k, had the best fitting effect; the coefficient of correlation R2 was over 0.95. The kinetic fitting effects of the other models, the zero-order kinetics and the single-component first-order kinetics which treats the mixture as a whole with a common hydrolysis characteristics and the k = 0.02, as well as the two-component first-order kinetics which divided the mixture into rapid hydrolysis and slow hydrolysis groups, were all not ideal.

Keywords

Multiple components, Gas production, The first-order kineticsykinetic fitting

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