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| The purpose of this work is to establish a new domestic landfill gas (LFG) generation rate model accounting for the impact of leachate recirculation. FKTSR model, namely a LFG generation rate model of the First-order Kinetics and Two-Stage Reaction, in which nutrient balance for biochemical reaction in two main stages is taken into account. In this study, FKTSR model was modified by introduction of outflow function and organic acid conversion coefficient in order to represent the in-situ condition of nutrient loss through leachate. Laboratory experiments were carried out to simulate the impact of leachate recirculation and to verify the modified FKTSR model. The model calibration was then conducted using the observed data of experiments. Fitting results suggest that the new model gives satisfactory fits to experimental data, and the main parameters, LFG production potential (L0), reaction rate constant in first stage (K1), reaction rate constant in second stage (K2) of the modified FKTSR model are 64.746L, 0.202d-1, 0.338d-1, respectively, comparing to the old ones of 42.069L, 0.231d-1, 0.231d-1. The fitting result proves that the new model provides a better explanation for mechanisms involved for landfill gas generation. |
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| Keywords:methane;landfill gas;generation rate model;first-order reaction;outflow function |
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