Abstract
Introduction: In bioreactor landfills, leachate recirculation significantly influences the process of stabilization and the stability of slope. Method: To speed up the leachate recirculation and reduce its adverse impact on slope stability, this paper proposes a new method which constructs a spatial net consisted of bonded whole tyres in the municipal waste during landfilling. Results and Conclusion: In this study, a numerical two-permeability flow model was used to investigate the effects of tyres embedding on the outflow rate of leachate injection. Furthermore, it was coupled with momentum balance equations to determine the local factor of safety of slope stability. The established model was applied to a simplified bioreactor landfill. The simulation results demonstrated that the tyre net can accelerate the rate of leachate injection and contribute to distribute the liquid more uniformly. Meanwhile, the slope stability was improved due to the enforcement of waste in the presence of tyres.
Highlights
In bioreactor landfills, leachate recirculation significantly influences the process of stabilization and the stability of slope
Fig. (5) illustrates the variation of outflow and the presence of tyre net significantly speeds up the leachate injection up to three times
This paper proposed to use a spatial bonded whole tyre net to accelerate the leachate recirculation in bioreactor landfills
Summary
Leachate recirculation significantly influences the process of stabilization and the stability of slope. There exist many leachate recirculation systems in bioreactor landfills, including vertical wells (VWs) [9 - 12], horizontal trenches (HTs) [13 - 17] and drainage blankets (DBs) [18, 19]. Both whole and shredded tyres are commonly employed to form leachate drainage layers, but it remains an controversial issue regarding whether the self-ignition can occur for the scrape tyres in a leachate trench [20]. The positive pore liquid pressure is prone to reduce the shear strength of the MSW because of the decreasing effective stress, which poses a concern of slope instability
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