An Empirical Model for Methane Generation Rate during Anaerobic Digestion of Kitchen Wastes

Abstract:

In order to solve inconvenience of previous mathematical models in engineering practice and decision analysis, the empirical models of methane generation rate for single-phase and two-phase anaerobic digestion of kitchen wastes were established and revised by means of experimental observation and function fitting. The experiments of single-phase and two-phase anaerobic digestion of kitchen wastes were carried out by controlling temperature and pH of system at about 35°C and 7. Experimental results showed variation trend of methane production in single-phase and two-phase anaerobic digestion of kitchen wastes were similar to quadratic curve and linear curve respectively under neutral condition. Base on the observation, the benchmark empirical models of methane generation rate were created by method of function fitting, correlation coefficients of fitting function reached 0.9682 and 0.9772, respectively. The benchmark empirical models were revised by introducing load ratio, inhibition coefficients of pH and ammonia nitrogen. Results of significance variance test for empirical model showed the regression of empirical model was notable. It illustrated the empirical model could be used to predict methane production during single-phase and two-phase anaerobic digestion system of kitchen wastes. Moreover, the calculative process of empirical model was very simple.

• Periodical: Applied Mechanics and Materials (Volumes 291-294)
• Pages: 340-346
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.291-294.340
• Online since: February 2013
• Authors: Yun Wu, Xian Ming Zhang
• Keywords: Anaerobic Digestion, Empirical Model, Kitchen Waste, Methane Production

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